fix: bump client lock

ref:

docs/image-mode-technical.md

@@ -5,8 +5,9 @@
 Image mode mirrors the voice on-demand architecture exactly:
 
 - **Control plane (text messages):**
-  - `IE1:` image envelope announces image availability in chat.
+  - `IE2:` image envelope announces image availability in chat.
-  - `IR1:` direct fetch request asks sender to stream image fragments.
+- **Control plane (raw binary request):**
+  - Binary image fetch request (same raw route as image fragments).
 - **Data plane (raw binary packets):**
   - `ImagePacket` binary payload streamed via `cmdSendRawData` / `pushRawData`.
 
@@ -17,8 +18,8 @@ pixels are fetched on demand when the user taps the image bubble.
 
 - `lib/utils/image_message_parser.dart`
   - `ImagePacket` (binary fragment format)
-  - `ImageEnvelope` (`IE1`)
+  - `ImageEnvelope` (`IE2`)
-  - `ImageFetchRequest` (`IR1`)
+  - `ImageFetchRequest` (binary)
   - `fragmentImage()` — split compressed bytes into packets
   - `reassembleImage()` — join received fragments into bytes
 - `lib/screens/messages_tab.dart`
@@ -27,7 +28,7 @@ pixels are fetched on demand when the user taps the image bubble.
   - Reassembly sessions, outgoing cache, deferred serving
   - Outgoing sessions also registered as complete incoming sessions for immediate local display
 - `lib/providers/app_provider.dart`
-  - Incoming routing for `IE1`, `IR1`, binary `0x49` packets
+  - Incoming routing for `IE2`, binary image fetch requests, binary `0x49` packets
 - `lib/widgets/messages/image_message_bubble.dart`
   - Square cover thumbnail (up to 256 px); tap-to-load for received images;
     progress ring during fetch; full-screen `InteractiveViewer` on tap
@@ -39,52 +40,52 @@ pixels are fetched on demand when the user taps the image bubble.
 
 ## 3. Wire Formats
 
-### 3.1 Image Envelope (`IE1`)
+### 3.1 Image Envelope (`IE2`)
 
-Prefix: `IE1:` + colon-delimited payload
+Prefix: `IE2:` + colon-delimited compact payload (base36 numeric fields)
 
 Fields:
 
 | Field        | Type   | Description                                    |
 |--------------|--------|------------------------------------------------|
-| `sid`        | string | 8 hex chars (4 bytes), session ID              |
+| `sid`        | string | base36 token for 32-bit session ID             |
-| `fmt`        | int    | `ImageFormat.id` (0 = AVIF, 1 = JPEG)         |
+| `fmt`        | base36 | `ImageFormat.id` (0 = AVIF, 1 = JPEG)         |
-| `total`      | int    | Fragment count (1..255)                        |
+| `total`      | base36 | Fragment count (1..255)                        |
-| `w`          | int    | Actual image width after compression (pixels)  |
+| `w`          | base36 | Actual image width after compression (pixels)  |
-| `h`          | int    | Actual image height after compression (pixels) |
+| `h`          | base36 | Actual image height after compression (pixels) |
-| `bytes`      | int    | Total compressed size in bytes                 |
+| `bytes`      | base36 | Total compressed size in bytes                 |
 | `senderKey6` | string | 12 hex chars (6 bytes sender prefix)           |
-| `ts`         | int    | Unix timestamp (seconds)                       |
+| `ts`         | base36 | Unix timestamp (seconds)                       |
-| `ver`        | int    | Protocol version (currently `1`)               |
 
 Compact format:
 
 ```text
-IE1:{sid}:{fmt}:{total}:{w}:{h}:{bytes}:{senderKey6}:{ts}:{ver}
+IE2:{sid}:{fmt}:{total}:{w}:{h}:{bytes}:{senderKey6}:{ts}
 ```
 
 Example (256×171 landscape image, 14 fragments):
 
 ```text
-IE1:deadbeef:0:14:256:171:2100:aabbccddeeff:1700000000:1
+IE2:a:0:e:74:4r:1mc:aabbccddeeff:s44we8
 ```
 
-Note: `w` and `h` reflect the actual post-compression dimensions, which preserve
+Note: `sid` is base36 on wire and expands to 8-hex internally.
+`w` and `h` reflect the actual post-compression dimensions, which preserve
 the source aspect ratio (contain within the configured max size).
 
-### 3.2 Image Fetch Request (`IR1`)
+### 3.2 Image Fetch Request (binary)
 
-Same structure as `VR1`:
+Binary payload format:
 
 ```text
-IR1:{sid}:{want}:{requesterKey6}:{ts}:{ver}
+[magic=0x69][sid:4B][flags:1B][requesterKey6:6B][ts:4B][missingCount:1B][missingIndices...]
 ```
 
 | Field            | Value                    |
 |------------------|--------------------------|
-| `want`           | `a` (= "all fragments")  |
+| `flags`          | bit0=1 => request missing indices, else all |
-| `requesterKey6`  | 12 hex chars             |
+| `requesterKey6`  | 6-byte requester key prefix |
-| `ver`            | `1`                      |
+| `ts`             | unix timestamp seconds (u32) |
 
 ### 3.3 Raw Image Packet (data plane)
 
@@ -151,16 +152,16 @@ only the shorter axis is padded — no cropping occurs.
 7. Envelope sent via normal message path:
    - Channel: `sendChannelMessage`
    - Direct: `sendTextMessage`
-8. Local placeholder message added (`IE1:` text, `deliveryStatus.sending`).
+8. Local placeholder message added (`IE2:` text, `deliveryStatus.sending`).
 
 ## 6. Incoming Flow (Receive)
 
-### 6.1 `IE1` envelope received
+### 6.1 `IE2` envelope received
 
 `AppProvider` calls `imageProvider.registerEnvelope()` and adds the message to
 chat.  The bubble shows a grey square placeholder with a download icon.
 
-### 6.2 `IR1` request received
+### 6.2 Binary image fetch request received
 
 `AppProvider` treats it as control-plane only (not added to chat):
 
@@ -194,7 +195,7 @@ When `cacheOutgoingSession()` is called it also writes all fragments into
 - **Complete session**: `AspectRatio(1.0)` → `AvifImage.memory(fit: cover)`
   square thumbnail; tap → full-screen `InteractiveViewer` with fade transition.
 - **Incomplete/missing**: grey square placeholder with download icon;
-  tap → sends `IR1` fetch request.
+  tap → sends binary fetch request.
 - **Loading**: circular progress indicator showing `received/total` count.
 - **Error**: broken-image icon.
 
@@ -212,7 +213,8 @@ Image bubbles and Message Technical Details show an **estimated transmit time**
 The estimate is airtime-based (LoRa packet model), not just compressed image size:
 
 - Source inputs:
-  - `total` fragments and `bytes` from `IE1` envelope
+  - `total` fragments and `bytes` from `IE2` envelope
+  - all numeric envelope values are decoded from base36
   - `pathLen` from message metadata
   - current radio params from `deviceInfo`: `radioBw`, `radioSf`, `radioCr`
 - Per-fragment payload model:
@@ -248,6 +250,16 @@ Fallback defaults are used when radio params are unavailable: `SF10`, `BW250kHz`
 - Raw return path requires a valid direct route to requester.
 - Available on iOS and Android (`image_picker` + `flutter_avif`).
 
+### 11.1 Raw Binary Routing Semantics
+
+- Image fragment payloads use companion command `CMD_SEND_RAW_DATA` (`25` / `0x19`).
+- Companion push back to the app is `PUSH_CODE_RAW_DATA` (`0x84`).
+- Over-the-air packet type for this flow is `PAYLOAD_TYPE_RAW_CUSTOM` (`0x0F`).
+- This flow is direct-route only, not flood/broadcast:
+  - it is sent to one destination path;
+  - only nodes on that path relay it;
+  - it is **not** received by everyone in the mesh.
+
 ## 12. High-Level Sequence
 
 ```mermaid
@@ -260,10 +272,10 @@ sequenceDiagram
   A->>A: Compress: contain resize → grayscale → PNG → AVIF
   A->>A: Fragment into ≤152B packets
   A->>A: Cache outgoing + populate local session (immediate display)
-  A->>M: Send IE1 envelope (actual w×h, fragment count)
+  A->>M: Send IE2 envelope (actual w×h, fragment count)
-  M->>B: Deliver IE1
+  M->>B: Deliver IE2
   B->>B: Render grey placeholder bubble
-  B->>A: Tap → send IR1 fetch request
+  B->>A: Tap → send binary fetch request
   A->>B: Stream binary ImagePackets
   B->>B: Reassemble fragments
   B->>B: Display AVIF image (cover thumbnail)

docs/voice-mode-technical.md

@@ -5,8 +5,9 @@
 Voice mode uses a **two-plane architecture**:
 
 - **Control plane (text messages):**
-  - `VE1:` voice envelope announces voice availability in chat.
+  - `VE2:` voice envelope announces voice availability in chat.
-  - `VR1:` direct fetch request asks sender to stream voice payload.
+- **Control plane (raw binary request):**
+  - Binary voice fetch request (same raw route as voice packets).
 - **Data plane (raw binary packets):**
   - `VoicePacket` payload streamed via `cmdSendRawData` and received through `pushRawData`.
 
@@ -16,73 +17,58 @@ This design avoids broadcasting full voice payloads to channels/rooms. Chat carr
 
 - `lib/utils/voice_message_parser.dart`
   - `VoicePacket` (legacy text + binary packet format)
-  - `VoiceEnvelope` (`VE1`)
+  - `VoiceEnvelope` (`VE2`)
-  - `VoiceFetchRequest` (`VR1`)
+  - `VoiceFetchRequest` (binary)
 - `lib/screens/messages_tab.dart`
   - Capture/encode voice, cache encoded packets, send envelope only
 - `lib/providers/voice_provider.dart`
   - Reassembly/playback sessions
   - Outgoing session cache + deferred serving
 - `lib/providers/app_provider.dart`
-  - Incoming routing for `VE1` and `VR1`
+  - Incoming routing for `VE2` and binary voice fetch requests
   - Handles raw packet ingestion
 - `lib/widgets/messages/voice_message_bubble.dart`
   - Play behavior (immediate play if complete, otherwise fetch + auto-play)
 - `lib/providers/messages_provider.dart`
-  - Message-level voice detection (`VE1` + legacy `V:`)
+  - Message-level voice detection (`VE2` + legacy `V:`)
 - `lib/services/message_storage_service.dart`
   - Persists `isVoice` and `voiceId`
 
 ## 3. Wire Formats
 
-### 3.1 Voice Envelope (`VE1`)
+### 3.1 Voice Envelope (`VE2`)
 
-Prefix: `VE1:` + colon-delimited compact payload
+Prefix: `VE2:` + colon-delimited compact payload (base36 numeric fields)
 
 Fields:
 
-- `sid` (string, 8 hex chars): session ID
+- `sid` (string): base36 token for 32-bit session ID
-- `mode` (int): codec mode ID (`VoicePacketMode.id`)
+- `mode` (base36): codec mode ID (`VoicePacketMode.id`)
-- `total` (int): packet count (1..255)
+- `total` (base36): packet count (1..255)
-- `durMs` (int): estimated duration in ms
+- `durS` (base36): estimated duration in seconds
 - `senderKey6` (string, 12 hex chars): sender public-key prefix (6 bytes)
-- `ts` (int): unix timestamp seconds
+- `ts` (base36): unix timestamp seconds
-- `ver` (int): protocol version (currently `1`)
+
+`sid` is base36 on wire and expands to 8-hex internally.
 
 Compact format:
 
 ```text
-VE1:{sid}:{mode}:{total}:{durMs}:{senderKey6}:{ts}:{ver}
+VE2:{sid}:{mode}:{total}:{durS}:{senderKey6}:{ts}
 ```
 
 Example:
 
 ```text
-VE1:deadbeef:1:4:3200:aabbccddeeff:1700000000:1
+VE2:a:1:4:4:aabbccddeeff:s44we8
 ```
 
-### 3.2 Voice Fetch Request (`VR1`)
+### 3.2 Voice Fetch Request (binary)
 
-Prefix: `VR1:` + colon-delimited compact payload
+Binary payload format:
-
-Fields:
-
-- `sid` (string, 8 hex chars): requested session
-- `want` (string): currently `a` (compact token for `all`)
-- `requesterKey6` (string, 12 hex chars): requester key prefix
-- `ts` (int): unix timestamp seconds
-- `ver` (int): protocol version (`1`)
-
-Compact format:
 
 ```text
-VR1:{sid}:{want}:{requesterKey6}:{ts}:{ver}
+[magic=0x72][sid:4B][flags:1B][requesterKey6:6B][ts:4B][missingCount:1B][missingIndices...]
-```
-
-Example:
-
-```text
-VR1:deadbeef:a:112233445566:1700000010:1
 ```
 
 ### 3.3 Raw Voice Packet (data plane)
@@ -102,18 +88,18 @@ Binary payload structure:
 2. Each chunk is codec2-encoded into `VoicePacket` objects.
 3. Packets are cached in `VoiceProvider` outgoing cache (TTL 15 min).
 4. Sender inserts local voice placeholder message (`isVoice=true`, `voiceId=sessionId`).
-5. Sender sends one envelope (`VE1`) through normal message path:
+5. Sender sends one envelope (`VE2`) through normal message path:
    - channel/room: `sendChannelMessage`
    - direct: `sendTextMessage`
 6. **No raw audio packets are sent during initial send.**
 
 ## 5. Incoming Routing
 
-### 5.1 `VE1` envelope received
+### 5.1 `VE2` envelope received
 
 `AppProvider` marks message as voice (`isVoice`, `voiceId`) and adds it to chat.
 
-### 5.2 `VR1` request received
+### 5.2 Binary voice fetch request received
 
 `AppProvider` treats it as control-plane only:
 
@@ -132,8 +118,8 @@ In `VoiceMessageBubble`:
 
 - If session already complete: play immediately.
 - If incomplete/missing:
-  1. Resolve sender contact (message sender prefix or `VE1.senderKey6` fallback)
+  1. Resolve sender contact (message sender prefix or `VE2.senderKey6` fallback)
-  2. Send direct `VR1` fetch request
+  2. Send direct binary fetch request
   3. Show requesting state in UI
   4. Auto-play when session becomes complete
 
@@ -170,10 +156,9 @@ Parser validation enforces:
 - strict hex lengths for IDs and key prefixes
 - valid mode range
 - valid packet counts and duration bounds
-- fixed protocol version (`ver == 1`)
+- compact base36 numeric fields in envelope/request
-- `VR1.want` token `a` (internally normalized to `all`)
+- Binary request flags specify `all` or `missing` indices.
-
+- Request payload includes `requesterKey6` to resolve return route.
-`VR1` handling verifies sender prefix matches `requesterKey6` to reduce spoofing risk.
 
 ## 10. Transmit Time Estimate (UI)
 
@@ -182,7 +167,8 @@ Voice bubbles and Message Technical Details show an **estimated transmit time**
 The estimate is airtime-based (LoRa packet model), not file-duration-only:
 
 - Source inputs:
-  - `packetCount` and `durationMs` from `VE1` envelope, or
+  - `packetCount` and `durationMs` from `VE2` envelope, or
+  - numeric envelope values decoded from base36
   - actual received `VoicePacket.codec2Data.length` bytes when local session packets exist
   - `pathLen` from message metadata
   - current radio params from `deviceInfo`: `radioBw`, `radioSf`, `radioCr`
@@ -210,10 +196,20 @@ Fallback defaults are used when radio params are unavailable: `SF10`, `BW250kHz`
 - Raw return path needs a currently valid direct route to requester.
 - Voice capture is available on iOS and Android (`Platform.isIOS || Platform.isAndroid`).
 
+### 11.1 Raw Binary Routing Semantics
+
+- Voice payload packets use companion command `CMD_SEND_RAW_DATA` (`25` / `0x19`).
+- Companion push back to the app is `PUSH_CODE_RAW_DATA` (`0x84`).
+- Over-the-air packet type for this flow is `PAYLOAD_TYPE_RAW_CUSTOM` (`0x0F`).
+- This flow is direct-route only, not flood/broadcast:
+  - it is sent to one destination path;
+  - only nodes on that path relay it;
+  - it is **not** received by everyone in the mesh.
+
 ## 12. Backward Compatibility
 
 - Legacy `V:` text packet parsing is still supported.
-- Message voice detection accepts both new `VE1` and legacy `V:` formats.
+- Message voice detection accepts `VE2` and legacy `V:` formats.
 
 ## 13. High-Level Sequence
 
@@ -225,10 +221,10 @@ sequenceDiagram
 
   A->>A: Record + encode voice packets
   A->>A: Cache session packets (TTL 15m)
-  A->>M: Send VE1 envelope
+  A->>M: Send VE2 envelope
-  M->>B: Deliver VE1
+  M->>B: Deliver VE2
   B->>B: Render voice bubble (metadata only)
-  B->>A: Send VR1 request on Play
+  B->>A: Send binary fetch request on Play
   A->>B: Stream raw VoicePacket packets
   B->>B: Reassemble session
   B->>B: Auto-play when complete

ios/Runner.xcodeproj/project.pbxproj

@@ -489,7 +489,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
-				CURRENT_PROJECT_VERSION = 74;
+				CURRENT_PROJECT_VERSION = 84;
 				DEVELOPMENT_TEAM = JND55328G8;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
@@ -511,7 +511,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 74;
+				CURRENT_PROJECT_VERSION = 84;
 				DEVELOPMENT_TEAM = JND55328G8;
 				GENERATE_INFOPLIST_FILE = YES;
 				MARKETING_VERSION = 1.0;
@@ -530,7 +530,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 74;
+				CURRENT_PROJECT_VERSION = 84;
 				DEVELOPMENT_TEAM = JND55328G8;
 				GENERATE_INFOPLIST_FILE = YES;
 				MARKETING_VERSION = 1.0;
@@ -547,7 +547,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 74;
+				CURRENT_PROJECT_VERSION = 84;
 				DEVELOPMENT_TEAM = JND55328G8;
 				GENERATE_INFOPLIST_FILE = YES;
 				MARKETING_VERSION = 1.0;
@@ -679,7 +679,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
-				CURRENT_PROJECT_VERSION = 74;
+				CURRENT_PROJECT_VERSION = 84;
 				DEVELOPMENT_TEAM = JND55328G8;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
@@ -702,7 +702,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
-				CURRENT_PROJECT_VERSION = 74;
+				CURRENT_PROJECT_VERSION = 84;
 				DEVELOPMENT_TEAM = JND55328G8;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;

ios/Runner/Info.plist

@@ -43,7 +43,7 @@
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>74</string>
+	<string>84</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>NSBluetoothAlwaysUsageDescription</key>

ios/fastlane/report.xml

@@ -5,22 +5,22 @@
     
     
       
-      <testcase classname="fastlane.lanes" name="0: default_platform" time="0.000195">
+      <testcase classname="fastlane.lanes" name="0: default_platform" time="0.000211">
         
       </testcase>
     
       
-      <testcase classname="fastlane.lanes" name="1: increment_build_number" time="0.405396">
+      <testcase classname="fastlane.lanes" name="1: increment_build_number" time="0.408783">
         
       </testcase>
     
       
-      <testcase classname="fastlane.lanes" name="2: build_app" time="101.387002">
+      <testcase classname="fastlane.lanes" name="2: build_app" time="120.492323">
         
       </testcase>
     
       
-      <testcase classname="fastlane.lanes" name="3: upload_to_app_store" time="209.873722">
+      <testcase classname="fastlane.lanes" name="3: upload_to_app_store" time="12.544865">
         
       </testcase>
     

lib/providers/app_provider.dart

@@ -8,6 +8,8 @@ import 'drawing_provider.dart';
 import 'channels_provider.dart';
 import 'voice_provider.dart';
 import 'image_provider.dart' as ip;
+import 'helpers/fragment_ack_wait_registry.dart';
+import 'helpers/session_metadata_restore.dart';
 import '../services/tile_cache_service.dart';
 import '../services/location_tracking_service.dart';
 import '../services/packet_capture_storage_service.dart';
@@ -42,6 +44,8 @@ class AppProvider with ChangeNotifier {
 
   bool _isMapEnabled = true;
   bool get isMapEnabled => _isMapEnabled;
+  bool _isContactsEnabled = true;
+  bool get isContactsEnabled => _isContactsEnabled;
 
   bool _isVoiceSilenceTrimmingEnabled = true;
   bool get isVoiceSilenceTrimmingEnabled => _isVoiceSilenceTrimmingEnabled;
@@ -57,8 +61,13 @@ class AppProvider with ChangeNotifier {
   static const Duration _packetRetryDelay = Duration(milliseconds: 1200);
   static const int _maxPacketRetryAttempts = 4;
   final Map<String, String> _voiceSessionSenderKey6 = {};
+  final Map<String, String> _imageSessionSenderKey6 = {};
   final Map<String, Timer> _voiceMissingRetryTimers = {};
   final Map<String, int> _voiceMissingRetryAttempts = {};
+  final FragmentAckWaitRegistry _voiceFragmentAckWaiters =
+      FragmentAckWaitRegistry();
+  final FragmentAckWaitRegistry _imageFragmentAckWaiters =
+      FragmentAckWaitRegistry();
   Timer? _packetCaptureFlushTimer;
   String? _lastPersistedPacketSignature;
   bool _isPersistingPacketCapture = false;
@@ -78,6 +87,7 @@ class AppProvider with ChangeNotifier {
     _initializeLocationTracking();
     _loadSimpleMode();
     _loadMapEnabled();
+    _loadContactsEnabled();
     _loadVoiceSilenceTrimmingEnabled();
     _loadVoiceBandPassFilterEnabled();
     _loadVoiceCompressorEnabled();
@@ -159,12 +169,35 @@ class AppProvider with ChangeNotifier {
     // Give DrawingProvider a moment to finish loading too
     await Future.delayed(const Duration(milliseconds: 100));
 
+    _restoreSessionMetadataFromMessages();
+
     debugPrint(
       '🔄 [AppProvider] Early sync: syncing drawings from messages...',
     );
     messagesProvider.syncDrawingsWithProvider(drawingProvider);
   }
 
+  void _restoreSessionMetadataFromMessages() {
+    final restored = restoreSessionMetadataFromMessages(
+      messagesProvider.messages.map((message) => message.text),
+    );
+
+    _voiceSessionSenderKey6.addAll(restored.voiceSenderKeyBySession);
+    for (final entry in restored.imageEnvelopeBySession.entries) {
+      _imageSessionSenderKey6[entry.key] = entry.value.senderKey6.toLowerCase();
+      imageProvider.registerEnvelope(entry.value);
+    }
+
+    final restoredVoice = restored.voiceSenderKeyBySession.length;
+    final restoredImage = restored.imageEnvelopeBySession.length;
+    if (restoredVoice > 0 || restoredImage > 0) {
+      debugPrint(
+        '🔄 [AppProvider] Restored session metadata from messages: '
+        '$restoredVoice voice, $restoredImage image',
+      );
+    }
+  }
+
   /// Load simple mode setting from shared preferences
   Future<void> _loadSimpleMode() async {
     try {
@@ -211,6 +244,29 @@ class AppProvider with ChangeNotifier {
     }
   }
 
+  /// Load contacts enabled setting from shared preferences
+  Future<void> _loadContactsEnabled() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      _isContactsEnabled = prefs.getBool('contacts_enabled') ?? true;
+      notifyListeners();
+    } catch (e) {
+      debugPrint('Error loading contacts enabled setting: $e');
+    }
+  }
+
+  /// Toggle contacts tab on/off
+  Future<void> toggleContactsEnabled(bool enabled) async {
+    try {
+      _isContactsEnabled = enabled;
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setBool('contacts_enabled', enabled);
+      notifyListeners();
+    } catch (e) {
+      debugPrint('Error saving contacts enabled setting: $e');
+    }
+  }
+
   /// Load voice silence trimming setting from shared preferences.
   Future<void> _loadVoiceSilenceTrimmingEnabled() async {
     try {
@@ -404,6 +460,26 @@ class AppProvider with ChangeNotifier {
             payload: payload,
           );
         };
+    voiceProvider.waitForFragmentAckCallback =
+        ({
+          required sessionId,
+          required index,
+          timeout = const Duration(seconds: 8),
+        }) => _waitForVoiceFragmentAck(
+          sessionId: sessionId,
+          index: index,
+          timeout: timeout,
+        );
+    imageProvider.waitForFragmentAckCallback =
+        ({
+          required sessionId,
+          required index,
+          timeout = const Duration(seconds: 8),
+        }) => _waitForImageFragmentAck(
+          sessionId: sessionId,
+          index: index,
+          timeout: timeout,
+        );
 
     // When a contact is received from BLE
     connectionProvider.onContactReceived = (contact) {
@@ -540,62 +616,6 @@ class AppProvider with ChangeNotifier {
         }
       }
 
-      // Voice control plane: request sender to stream raw voice packets.
-      final voiceFetchRequest = VoiceFetchRequest.tryParseText(
-        enrichedMessage.text,
-      );
-      if (voiceFetchRequest != null) {
-        final senderPrefix = enrichedMessage.senderPublicKeyPrefix;
-        if (senderPrefix == null) {
-          debugPrint(
-            '⚠️ [AppProvider] Voice fetch request without sender prefix',
-          );
-          return;
-        }
-        final senderPrefixHex = senderPrefix
-            .take(6)
-            .map((b) => b.toRadixString(16).padLeft(2, '0'))
-            .join('');
-        if (senderPrefixHex.toLowerCase() !=
-            voiceFetchRequest.requesterKey6.toLowerCase()) {
-          debugPrint('⚠️ [AppProvider] Voice fetch requester key mismatch');
-          return;
-        }
-        final requester = contactsProvider.findContactByPrefix(senderPrefix);
-        if (requester == null) {
-          debugPrint(
-            '⚠️ [AppProvider] Voice fetch requester contact not found',
-          );
-          messagesProvider.logSystemMessage(
-            text:
-                'Cannot fetch voice: requester contact is unknown. Add/sync contacts first.',
-            level: 'warning',
-          );
-          return;
-        }
-        if (requester.outPathLen > _maxDirectPayloadHops) {
-          debugPrint(
-            '⚠️ [AppProvider] Voice fetch requester too far: ${requester.outPathLen} hops',
-          );
-          messagesProvider.logSystemMessage(
-            text:
-                'Cannot fetch voice for ${requester.advName}: message is too far (${requester.outPathLen} hops, max $_maxDirectPayloadHops).',
-            level: 'warning',
-          );
-          return;
-        }
-        unawaited(
-          voiceProvider.serveSessionTo(
-            sessionId: voiceFetchRequest.sessionId,
-            requester: requester,
-            requestedIndices: voiceFetchRequest.want == 'missing'
-                ? voiceFetchRequest.missingIndices.toSet()
-                : null,
-          ),
-        );
-        return;
-      }
-
       // Check if message is a drawing broadcast
       if (DrawingMessageParser.isDrawingMessage(enrichedMessage.text)) {
         debugPrint('🎨 [AppProvider] Drawing message received, parsing...');
@@ -665,61 +685,12 @@ class AppProvider with ChangeNotifier {
         return;
       }
 
-      // Image fetch request (IR1): requester asks us to stream image fragments.
-      final imageFetchRequest = ImageFetchRequest.tryParse(
-        enrichedMessage.text,
-      );
-      if (imageFetchRequest != null) {
-        final senderPrefix = enrichedMessage.senderPublicKeyPrefix;
-        if (senderPrefix != null) {
-          final senderPrefixHex = senderPrefix
-              .take(6)
-              .map((b) => b.toRadixString(16).padLeft(2, '0'))
-              .join('');
-          if (senderPrefixHex.toLowerCase() ==
-              imageFetchRequest.requesterKey6.toLowerCase()) {
-            final requester = contactsProvider.findContactByPrefix(
-              senderPrefix,
-            );
-            if (requester != null) {
-              if (requester.outPathLen > _maxDirectPayloadHops) {
-                debugPrint(
-                  '⚠️ [AppProvider] Image fetch requester too far: ${requester.outPathLen} hops',
-                );
-                messagesProvider.logSystemMessage(
-                  text:
-                      'Cannot fetch image for ${requester.advName}: message is too far (${requester.outPathLen} hops, max $_maxDirectPayloadHops).',
-                  level: 'warning',
-                );
-                return;
-              }
-              unawaited(
-                imageProvider.serveSessionTo(
-                  sessionId: imageFetchRequest.sessionId,
-                  requester: requester,
-                  requestedIndices: imageFetchRequest.want == 'missing'
-                      ? imageFetchRequest.missingIndices.toSet()
-                      : null,
-                ),
-              );
-            } else {
-              debugPrint(
-                '⚠️ [AppProvider] Image fetch requester contact not found',
-              );
-              messagesProvider.logSystemMessage(
-                text:
-                    'Cannot fetch image: requester contact is unknown. Add/sync contacts first.',
-                level: 'warning',
-              );
-            }
-          }
-        }
-        return; // IR1 is control-plane only; not displayed in chat
-      }
-
       // Image envelope (IE1): announce image availability.
       final imageEnvelope = ImageEnvelope.tryParse(enrichedMessage.text);
       if (imageEnvelope != null) {
+        _imageSessionSenderKey6[imageEnvelope.sessionId] = imageEnvelope
+            .senderKey6
+            .toLowerCase();
         imageProvider.registerEnvelope(imageEnvelope);
         messagesProvider.addMessage(
           enrichedMessage,
@@ -800,8 +771,105 @@ class AppProvider with ChangeNotifier {
     };
 
     // When raw binary data is received (PUSH_CODE_RAW_DATA 0x84)
+    // Magic 0x72 'r' = voice fetch request; 0x69 'i' = image fetch request.
     // Magic 0x56 'V' = voice packet; magic 0x49 'I' = image packet.
     connectionProvider.onRawDataReceived = (payload, snrRaw, rssiDbm) {
+      final voiceFetchRequest = VoiceFetchRequest.tryParseBinary(payload);
+      if (voiceFetchRequest != null) {
+        final requester = contactsProvider.findContactByPrefixHex(
+          voiceFetchRequest.requesterKey6,
+        );
+        if (requester == null) {
+          debugPrint(
+            '⚠️ [AppProvider] Voice fetch requester contact not found (binary)',
+          );
+          messagesProvider.logSystemMessage(
+            text:
+                'Cannot fetch voice: requester contact is unknown. Add/sync contacts first.',
+            level: 'warning',
+          );
+          return;
+        }
+        if (requester.outPathLen > _maxDirectPayloadHops) {
+          debugPrint(
+            '⚠️ [AppProvider] Voice fetch requester too far: ${requester.outPathLen} hops',
+          );
+          messagesProvider.logSystemMessage(
+            text:
+                'Cannot fetch voice for ${requester.advName}: message is too far (${requester.outPathLen} hops, max $_maxDirectPayloadHops).',
+            level: 'warning',
+          );
+          return;
+        }
+        unawaited(
+          voiceProvider.serveSessionTo(
+            sessionId: voiceFetchRequest.sessionId,
+            requester: requester,
+            requestedIndices: voiceFetchRequest.want == 'missing'
+                ? voiceFetchRequest.missingIndices.toSet()
+                : null,
+          ),
+        );
+        return;
+      }
+
+      final imageFetchRequest = ImageFetchRequest.tryParseBinary(payload);
+      if (imageFetchRequest != null) {
+        final requester = _resolveImageFetchRequester(imageFetchRequest);
+        if (requester == null) {
+          debugPrint(
+            '⚠️ [AppProvider] Image fetch requester contact not found (binary) '
+            'for session ${imageFetchRequest.sessionId} / '
+            '${imageFetchRequest.requesterKey6}',
+          );
+          messagesProvider.logSystemMessage(
+            text:
+                'Cannot fetch image: requester contact is unknown. Add/sync contacts first.',
+            level: 'warning',
+          );
+          return;
+        }
+        if (requester.outPathLen > _maxDirectPayloadHops) {
+          debugPrint(
+            '⚠️ [AppProvider] Image fetch requester too far: '
+            '${requester.outPathLen} hops for session '
+            '${imageFetchRequest.sessionId}',
+          );
+          messagesProvider.logSystemMessage(
+            text:
+                'Cannot fetch image for ${requester.advName}: message is too far (${requester.outPathLen} hops, max $_maxDirectPayloadHops).',
+            level: 'warning',
+          );
+          return;
+        }
+        debugPrint(
+          '📷 [AppProvider] Serving image session ${imageFetchRequest.sessionId} '
+          'to ${requester.advName} via ${requester.outPathLen} hop(s)',
+        );
+        unawaited(
+          imageProvider.serveSessionTo(
+            sessionId: imageFetchRequest.sessionId,
+            requester: requester,
+            requestedIndices: imageFetchRequest.want == 'missing'
+                ? imageFetchRequest.missingIndices.toSet()
+                : null,
+          ),
+        );
+        return;
+      }
+
+      final voiceAck = VoiceFragmentAck.tryParseBinary(payload);
+      if (voiceAck != null) {
+        _completeVoiceFragmentAck(voiceAck.sessionId, voiceAck.index);
+        return;
+      }
+
+      final imageAck = ImageFragmentAck.tryParseBinary(payload);
+      if (imageAck != null) {
+        _completeImageFragmentAck(imageAck.sessionId, imageAck.index);
+        return;
+      }
+
       if (ImagePacket.isImageBinary(payload)) {
         final frag = ImagePacket.tryParseBinary(payload);
         if (frag == null) return;
@@ -812,6 +880,7 @@ class AppProvider with ChangeNotifier {
           width: session?.width ?? 0,
           height: session?.height ?? 0,
         );
+        _sendImageFragmentAck(frag);
         return;
       }
 
@@ -820,6 +889,7 @@ class AppProvider with ChangeNotifier {
       if (pkt == null) return;
       debugPrint('🎙️ [AppProvider] Binary voice packet received: $pkt');
       final justComplete = voiceProvider.addPacket(pkt);
+      _sendVoiceFragmentAck(pkt);
       _scheduleVoiceMissingRetry(pkt.sessionId, justComplete: justComplete);
       // Insert or update the placeholder message in the chat list
       _handleIncomingVoicePacket(pkt, justComplete: justComplete);
@@ -1152,6 +1222,42 @@ class AppProvider with ChangeNotifier {
     return contactsProvider.findContactByPrefixHex(prefixHex.toLowerCase());
   }
 
+  Contact? _resolveImageFetchRequester(ImageFetchRequest request) {
+    final liveContact = _resolveContactByPrefixHex(request.requesterKey6);
+    if (liveContact != null) {
+      return liveContact;
+    }
+
+    for (final message in messagesProvider.messages.reversed) {
+      final envelope = ImageEnvelope.tryParse(message.text);
+      if (envelope == null || envelope.sessionId != request.sessionId) {
+        continue;
+      }
+      final recipientKey = message.recipientPublicKey;
+      if (recipientKey == null || recipientKey.isEmpty) {
+        continue;
+      }
+      final recipient = contactsProvider.findContactByKey(recipientKey);
+      if (recipient == null) {
+        continue;
+      }
+      final recipientKey6 = recipient.publicKey
+          .sublist(0, 6)
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .join();
+      if (recipientKey6 != request.requesterKey6) {
+        continue;
+      }
+      debugPrint(
+        '📷 [AppProvider] Resolved image requester from sent message metadata '
+        'for session ${request.sessionId}: ${recipient.advName}',
+      );
+      return recipient;
+    }
+
+    return null;
+  }
+
   void _scheduleVoiceMissingRetry(
     String sessionId, {
     required bool justComplete,
@@ -1209,15 +1315,18 @@ class AppProvider with ChangeNotifier {
       missingIndices: missing,
       requesterKey6: requesterKey6,
       timestampSec: DateTime.now().millisecondsSinceEpoch ~/ 1000,
-      version: 1,
+      version: 2,
     );
 
-    final sent = await connectionProvider.sendTextMessage(
+    try {
-      contactPublicKey: sender.publicKey,
+      await connectionProvider.sendRawVoicePacket(
-      text: request.encodeText(),
+        contactPath: sender.outPath,
-      contact: sender,
+        contactPathLen: sender.outPathLen,
+        payload: request.encodeBinary(),
       );
-    if (!sent) return;
+    } catch (_) {
+      return;
+    }
 
     _voiceMissingRetryAttempts[sessionId] = attempt + 1;
     _voiceMissingRetryTimers[sessionId]?.cancel();
@@ -1266,6 +1375,96 @@ class AppProvider with ChangeNotifier {
     messagesProvider.addMessage(placeholder, contactLookup: (_) => '');
   }
 
+  String _fragmentAckKey(String sessionId, int index) => '$sessionId:$index';
+
+  Future<bool> _waitForVoiceFragmentAck({
+    required String sessionId,
+    required int index,
+    Duration timeout = const Duration(seconds: 8),
+  }) => _voiceFragmentAckWaiters.waitFor(
+    _fragmentAckKey(sessionId, index),
+    timeout: timeout,
+  );
+
+  void _completeVoiceFragmentAck(String sessionId, int index) {
+    final completed = _voiceFragmentAckWaiters.complete(
+      _fragmentAckKey(sessionId, index),
+    );
+    if (completed == 0) {
+      debugPrint(
+        'ℹ️ [AppProvider] Voice fragment ACK had no waiter: $sessionId#$index',
+      );
+      return;
+    }
+    debugPrint(
+      '✅ [AppProvider] Voice fragment ACK received for $sessionId#$index ($completed waiter(s))',
+    );
+  }
+
+  Future<bool> _waitForImageFragmentAck({
+    required String sessionId,
+    required int index,
+    Duration timeout = const Duration(seconds: 8),
+  }) => _imageFragmentAckWaiters.waitFor(
+    _fragmentAckKey(sessionId, index),
+    timeout: timeout,
+  );
+
+  void _completeImageFragmentAck(String sessionId, int index) {
+    final completed = _imageFragmentAckWaiters.complete(
+      _fragmentAckKey(sessionId, index),
+    );
+    if (completed == 0) {
+      debugPrint(
+        'ℹ️ [AppProvider] Image fragment ACK had no waiter: $sessionId#$index',
+      );
+      return;
+    }
+    debugPrint(
+      '✅ [AppProvider] Image fragment ACK received for $sessionId#$index ($completed waiter(s))',
+    );
+  }
+
+  void _sendVoiceFragmentAck(VoicePacket packet) {
+    final senderKey6 = _voiceSessionSenderKey6[packet.sessionId];
+    if (senderKey6 == null) return;
+    final sender = _resolveContactByPrefixHex(senderKey6);
+    if (sender == null) return;
+    if (sender.outPathLen < 0 || sender.outPathLen > _maxDirectPayloadHops) {
+      return;
+    }
+    unawaited(
+      connectionProvider.sendRawVoicePacket(
+        contactPath: sender.outPath,
+        contactPathLen: sender.outPathLen,
+        payload: VoiceFragmentAck(
+          sessionId: packet.sessionId,
+          index: packet.index,
+        ).encodeBinary(),
+      ),
+    );
+  }
+
+  void _sendImageFragmentAck(ImagePacket fragment) {
+    final senderKey6 = _imageSessionSenderKey6[fragment.sessionId];
+    if (senderKey6 == null) return;
+    final sender = _resolveContactByPrefixHex(senderKey6);
+    if (sender == null) return;
+    if (sender.outPathLen < 0 || sender.outPathLen > _maxDirectPayloadHops) {
+      return;
+    }
+    unawaited(
+      connectionProvider.sendRawVoicePacket(
+        contactPath: sender.outPath,
+        contactPathLen: sender.outPathLen,
+        payload: ImageFragmentAck(
+          sessionId: fragment.sessionId,
+          index: fragment.index,
+        ).encodeBinary(),
+      ),
+    );
+  }
+
   // Removed _syncMessages() - messages are automatically synced via PUSH_CODE_MSG_WAITING events
   // The ConnectionProvider's onMessageWaiting callback handles automatic message fetching
 

lib/providers/connection_provider.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'package:flutter/foundation.dart';
+import 'package:flutter/scheduler.dart';
 import 'package:flutter_blue_plus/flutter_blue_plus.dart';
 import 'package:crypto/crypto.dart';
 import '../models/device_info.dart';
@@ -117,6 +118,8 @@ class ConnectionProvider with ChangeNotifier {
   bool _noMoreMessages = false;
   // Prevent overlapping/too-frequent sync requests
   bool _isSyncingMessages = false;
+  // If MSG_WAITING arrives while a sync loop is active, queue one more pass.
+  bool _syncRequestedWhileBusy = false;
   DateTime? _lastSyncNextRequestedAt;
   static const Duration _minSyncNextInterval = Duration(milliseconds: 150);
 
@@ -310,7 +313,14 @@ class ConnectionProvider with ChangeNotifier {
 
     service.onMessageWaiting = () {
       debugPrint('📥 [Provider] MSG_WAITING - auto-syncing');
-      syncAllMessages();
+      if (_isSyncingMessages) {
+        _syncRequestedWhileBusy = true;
+        debugPrint(
+          '  ↪️ [Provider] Sync already running; queued follow-up sync',
+        );
+        return;
+      }
+      unawaited(syncAllMessages());
     };
 
     service.onLoginSuccess =
@@ -452,7 +462,7 @@ class ConnectionProvider with ChangeNotifier {
     _isScanning = true;
     _scannedDevices.clear();
     _error = null;
-    notifyListeners();
+    _notifyListenersSafely();
     debugPrint('✅ [Provider] Scan state initialized, notifying listeners');
 
     try {
@@ -468,7 +478,7 @@ class ConnectionProvider with ChangeNotifier {
           debugPrint(
             '✅ [Provider] Added device to list: ${device.platformName} (RSSI: $rssi dBm), total: ${_scannedDevices.length}',
           );
-          notifyListeners();
+          _notifyListenersSafely();
         } else {
           // Update RSSI if device already exists
           final index = _scannedDevices.indexWhere(
@@ -479,7 +489,7 @@ class ConnectionProvider with ChangeNotifier {
             debugPrint(
               '  🔄 [Provider] Updated RSSI for ${device.platformName}: $rssi dBm',
             );
-            notifyListeners();
+            _notifyListenersSafely();
           } else {
             debugPrint(
               '  ⏭️ [Provider] Device already in list with same RSSI, skipping',
@@ -493,7 +503,7 @@ class ConnectionProvider with ChangeNotifier {
     } finally {
       debugPrint('🏁 [Provider] Scan completed');
       _isScanning = false;
-      notifyListeners();
+      _notifyListenersSafely();
     }
   }
 
@@ -501,6 +511,18 @@ class ConnectionProvider with ChangeNotifier {
   Future<void> stopScan() async {
     await FlutterBluePlus.stopScan();
     _isScanning = false;
+    _notifyListenersSafely();
+  }
+
+  void _notifyListenersSafely() {
+    final phase = SchedulerBinding.instance.schedulerPhase;
+    if (phase == SchedulerPhase.transientCallbacks ||
+        phase == SchedulerPhase.persistentCallbacks) {
+      SchedulerBinding.instance.addPostFrameCallback((_) {
+        notifyListeners();
+      });
+      return;
+    }
     notifyListeners();
   }
 
@@ -558,7 +580,9 @@ class ConnectionProvider with ChangeNotifier {
 
     final success = await _tcpService!.connect(host, port);
     if (!success) {
-      _deviceInfo = _deviceInfo.copyWith(connectionState: ConnectionState.error);
+      _deviceInfo = _deviceInfo.copyWith(
+        connectionState: ConnectionState.error,
+      );
       notifyListeners();
     }
     return success;
@@ -1169,7 +1193,10 @@ class ConnectionProvider with ChangeNotifier {
       debugPrint('  Text: $text');
       debugPrint('  MessageID: $messageId');
 
-      await _activeService.sendChannelMessage(channelIdx: channelIdx, text: text);
+      await _activeService.sendChannelMessage(
+        channelIdx: channelIdx,
+        text: text,
+      );
 
       debugPrint('✅ [ConnectionProvider] BLE send completed');
       debugPrint(
@@ -1655,6 +1682,7 @@ class ConnectionProvider with ChangeNotifier {
   Future<int> syncAllMessages() async {
     if (_isSyncingMessages) {
       // Already syncing; avoid overlapping loops
+      _syncRequestedWhileBusy = true;
       return 0;
     }
 
@@ -1664,11 +1692,14 @@ class ConnectionProvider with ChangeNotifier {
       return 0;
     }
 
-    int count = 0;
+    int totalCount = 0;
-    _noMoreMessages = false; // Reset flag
 
     try {
       _isSyncingMessages = true;
+      do {
+        _syncRequestedWhileBusy = false;
+        _noMoreMessages = false; // Reset flag per pass
+        int passCount = 0;
         debugPrint('🔄 [Provider] Starting message sync loop...');
         debugPrint('  Initial _noMoreMessages state: $_noMoreMessages');
 
@@ -1680,7 +1711,7 @@ class ConnectionProvider with ChangeNotifier {
           // Check flag BEFORE sending (not after)
           if (_noMoreMessages) {
             debugPrint(
-            '✅ [Provider] Message sync complete - NoMoreMessages flag set after $count requests',
+              '✅ [Provider] Message sync complete - NoMoreMessages flag set after $passCount requests',
             );
             break;
           }
@@ -1704,7 +1735,8 @@ class ConnectionProvider with ChangeNotifier {
 
           await _activeService.syncNextMessage();
           _lastSyncNextRequestedAt = DateTime.now();
-        count++;
+          passCount++;
+          totalCount++;
 
           // Wait for response (true = message received, false = no more messages)
           // Timeout after 2 seconds to prevent hanging
@@ -1726,21 +1758,28 @@ class ConnectionProvider with ChangeNotifier {
           }
         }
 
-      if (!_noMoreMessages && count >= 100) {
+        if (!_noMoreMessages && passCount >= 100) {
           debugPrint(
             '⚠️ [Provider] Message sync stopped - reached safety limit of 100 requests without NoMoreMessages',
           );
         }
 
+        if (_syncRequestedWhileBusy) {
           debugPrint(
-        '🏁 [Provider] Message sync finished: sent $count sync requests, _noMoreMessages=$_noMoreMessages',
+            '↻ [Provider] MSG_WAITING received during sync; running another pass',
           );
-      return count;
+        }
+      } while (_syncRequestedWhileBusy && _activeService.isConnected);
+
+      debugPrint(
+        '🏁 [Provider] Message sync finished: sent $totalCount sync requests, _noMoreMessages=$_noMoreMessages',
+      );
+      return totalCount;
     } catch (e) {
       debugPrint('❌ [Provider] Failed to sync messages: $e');
       _error = 'Failed to sync messages: $e';
       notifyListeners();
-      return count;
+      return totalCount;
     } finally {
       _isSyncingMessages = false;
       _syncResponseCompleter = null;

lib/providers/helpers/fragment_ack_wait_registry.dart

@@ -0,0 +1,43 @@
+import 'dart:async';
+
+/// Tracks one or more in-flight waiters for the same fragment ACK key.
+///
+/// Duplicate fetch requests can race and wait on the same fragment ACK at once.
+/// Completing all registered waiters avoids losing the earlier completer when a
+/// later request registers for the same key.
+class FragmentAckWaitRegistry {
+  final Map<String, List<Completer<void>>> _waiters = {};
+
+  Future<bool> waitFor(
+    String key, {
+    Duration timeout = const Duration(seconds: 8),
+  }) async {
+    final completer = Completer<void>();
+    final waiters = _waiters.putIfAbsent(key, () => <Completer<void>>[]);
+    waiters.add(completer);
+    try {
+      await completer.future.timeout(timeout);
+      return true;
+    } catch (_) {
+      final pending = _waiters[key];
+      pending?.remove(completer);
+      if (pending != null && pending.isEmpty) {
+        _waiters.remove(key);
+      }
+      return false;
+    }
+  }
+
+  int complete(String key) {
+    final waiters = _waiters.remove(key);
+    if (waiters == null || waiters.isEmpty) {
+      return 0;
+    }
+    for (final completer in waiters) {
+      if (!completer.isCompleted) {
+        completer.complete();
+      }
+    }
+    return waiters.length;
+  }
+}

lib/providers/helpers/raw_session_retransmit.dart

@@ -0,0 +1,102 @@
+import 'package:flutter/foundation.dart';
+
+import '../../models/contact.dart';
+
+typedef RawPacketSender =
+    Future<void> Function({
+      required Uint8List contactPath,
+      required int contactPathLen,
+      required Uint8List payload,
+    });
+
+typedef FragmentAckWaiter =
+    Future<bool> Function({
+      required String sessionId,
+      required int index,
+      Duration timeout,
+    });
+
+Future<bool> serveCachedSessionFragments<T>({
+  required String providerLabel,
+  required String sessionId,
+  required Contact requester,
+  required List<T> fragments,
+  required int maxDirectPayloadHops,
+  required int Function(T fragment) indexOf,
+  required Uint8List Function(T fragment) encodeBinary,
+  required RawPacketSender? sendRawPacket,
+  FragmentAckWaiter? waitForFragmentAck,
+  Set<int>? requestedIndices,
+  Duration ackTimeout = const Duration(seconds: 8),
+}) async {
+  if (fragments.isEmpty) {
+    debugPrint('⚠️ [$providerLabel] No cached fragments for $sessionId');
+    return false;
+  }
+  if (sendRawPacket == null) {
+    debugPrint('⚠️ [$providerLabel] sendRawPacketCallback not set');
+    return false;
+  }
+  if (requester.outPathLen < 0) {
+    debugPrint('⚠️ [$providerLabel] ${requester.advName} has no direct path');
+    return false;
+  }
+  if (requester.outPathLen > maxDirectPayloadHops) {
+    debugPrint(
+      '⚠️ [$providerLabel] ${requester.advName} is too far: ${requester.outPathLen} hops (max $maxDirectPayloadHops)',
+    );
+    return false;
+  }
+  if (requester.outPath.isEmpty) {
+    debugPrint(
+      '⚠️ [$providerLabel] ${requester.advName} has empty outPath payload',
+    );
+    return false;
+  }
+
+  var servedCount = 0;
+  for (final fragment in fragments) {
+    final index = indexOf(fragment);
+    if (index < 0) {
+      debugPrint('⚠️ [$providerLabel] Invalid fragment index $index');
+      continue;
+    }
+    if (requestedIndices != null && !requestedIndices.contains(index)) {
+      continue;
+    }
+    try {
+      final ackFuture = waitForFragmentAck?.call(
+        sessionId: sessionId,
+        index: index,
+        timeout: ackTimeout,
+      );
+      await sendRawPacket(
+        contactPath: requester.outPath,
+        contactPathLen: requester.outPathLen,
+        payload: encodeBinary(fragment),
+      );
+      servedCount++;
+      if (ackFuture != null) {
+        final acked = await ackFuture;
+        if (!acked) {
+          debugPrint('⚠️ [$providerLabel] ACK timeout for $sessionId#$index');
+          return false;
+        }
+      }
+    } catch (e, st) {
+      debugPrint(
+        '❌ [$providerLabel] Serve error for $sessionId#$index: $e\n$st',
+      );
+      return false;
+    }
+  }
+
+  if (servedCount == 0) {
+    debugPrint(
+      '⚠️ [$providerLabel] No fragments matched request for $sessionId',
+    );
+    return false;
+  }
+  debugPrint('✅ [$providerLabel] Served $servedCount fragments for $sessionId');
+  return true;
+}

lib/providers/helpers/session_metadata_restore.dart

@@ -0,0 +1,38 @@
+import '../../utils/image_message_parser.dart';
+import '../../utils/voice_message_parser.dart';
+
+class RestoredSessionMetadata {
+  final Map<String, String> voiceSenderKeyBySession;
+  final Map<String, ImageEnvelope> imageEnvelopeBySession;
+
+  const RestoredSessionMetadata({
+    required this.voiceSenderKeyBySession,
+    required this.imageEnvelopeBySession,
+  });
+}
+
+RestoredSessionMetadata restoreSessionMetadataFromMessages(
+  Iterable<String> messageTexts,
+) {
+  final voiceSenderKeyBySession = <String, String>{};
+  final imageEnvelopeBySession = <String, ImageEnvelope>{};
+
+  for (final text in messageTexts) {
+    final voiceEnvelope = VoiceEnvelope.tryParseText(text);
+    if (voiceEnvelope != null) {
+      voiceSenderKeyBySession[voiceEnvelope.sessionId] = voiceEnvelope
+          .senderKey6
+          .toLowerCase();
+    }
+
+    final imageEnvelope = ImageEnvelope.tryParse(text);
+    if (imageEnvelope != null) {
+      imageEnvelopeBySession[imageEnvelope.sessionId] = imageEnvelope;
+    }
+  }
+
+  return RestoredSessionMetadata(
+    voiceSenderKeyBySession: voiceSenderKeyBySession,
+    imageEnvelopeBySession: imageEnvelopeBySession,
+  );
+}

lib/providers/image_provider.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 import 'package:flutter/foundation.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import '../models/contact.dart';
+import 'helpers/raw_session_retransmit.dart';
 import '../utils/image_message_parser.dart';
 
 /// Reassembly state for one incoming image session.
@@ -13,6 +14,8 @@ class ImageSession {
   final int width;
   final int height;
   final List<ImagePacket?> fragments; // indexed by fragment.index
+  DateTime? firstFragmentAt;
+  DateTime? lastFragmentAt;
 
   ImageSession({
     required this.sessionId,
@@ -25,6 +28,21 @@ class ImageSession {
   int get receivedCount => fragments.where((f) => f != null).length;
   bool get isComplete => receivedCount == total;
 
+  Duration? estimateRemaining() {
+    if (isComplete) return Duration.zero;
+    if (firstFragmentAt == null || lastFragmentAt == null) return null;
+    if (receivedCount < 2) return null;
+
+    final elapsedMs = lastFragmentAt!
+        .difference(firstFragmentAt!)
+        .inMilliseconds;
+    if (elapsedMs <= 0) return null;
+    final avgMsPerFragment = elapsedMs / (receivedCount - 1);
+    final remaining = total - receivedCount;
+    if (remaining <= 0) return Duration.zero;
+    return Duration(milliseconds: (avgMsPerFragment * remaining).round());
+  }
+
   /// Reassemble the complete image bytes, or null if any fragment is missing.
   Uint8List? get imageBytes => reassembleImage(fragments);
 }
@@ -40,6 +58,7 @@ class ImageProvider with ChangeNotifier {
 
   /// Incoming sessions keyed by sessionId.
   final Map<String, ImageSession> _sessions = {};
+  final Set<String> _ignoredIncomingSessions = {};
 
   /// Outgoing sessions cached for deferred serving.
   final Map<String, _OutgoingSession> _outgoing = {};
@@ -51,6 +70,12 @@ class ImageProvider with ChangeNotifier {
     required Uint8List payload,
   })?
   sendRawPacketCallback;
+  Future<bool> Function({
+    required String sessionId,
+    required int index,
+    Duration timeout,
+  })?
+  waitForFragmentAckCallback;
 
   ImageProvider() {
     _restore();
@@ -62,6 +87,10 @@ class ImageProvider with ChangeNotifier {
   bool isComplete(String sessionId) =>
       _sessions[sessionId]?.isComplete ?? false;
   bool hasOutgoing(String sessionId) => _outgoing.containsKey(sessionId);
+  Duration? estimateRemainingTransferTime(String sessionId) =>
+      _sessions[sessionId]?.estimateRemaining();
+  bool isReceiveCanceled(String sessionId) =>
+      _ignoredIncomingSessions.contains(sessionId);
 
   List<int> missingFragmentIndices(String sessionId) {
     final session = _sessions[sessionId];
@@ -81,6 +110,12 @@ class ImageProvider with ChangeNotifier {
   ///
   /// Returns true when the session just became complete.
   bool addFragment(ImagePacket fragment, {int width = 0, int height = 0}) {
+    if (_ignoredIncomingSessions.contains(fragment.sessionId)) {
+      debugPrint(
+        '⏹️ [ImageProvider] Ignoring canceled incoming session ${fragment.sessionId}',
+      );
+      return false;
+    }
     _sessions.putIfAbsent(
       fragment.sessionId,
       () => ImageSession(
@@ -94,7 +129,13 @@ class ImageProvider with ChangeNotifier {
 
     final session = _sessions[fragment.sessionId]!;
     if (fragment.index < session.total) {
+      final wasMissing = session.fragments[fragment.index] == null;
       session.fragments[fragment.index] = fragment;
+      if (wasMissing) {
+        final now = DateTime.now();
+        session.firstFragmentAt ??= now;
+        session.lastFragmentAt = now;
+      }
     }
 
     final justComplete = session.isComplete;
@@ -103,22 +144,27 @@ class ImageProvider with ChangeNotifier {
     return justComplete;
   }
 
+  void cancelIncomingSession(String sessionId) {
+    _ignoredIncomingSessions.add(sessionId);
+    _sessions.remove(sessionId);
+    unawaited(_persist());
+    notifyListeners();
+  }
+
+  void resumeIncomingSession(String sessionId) {
+    if (_ignoredIncomingSessions.remove(sessionId)) {
+      notifyListeners();
+    }
+  }
+
   /// Register envelope metadata for a session (called when IE1 is received
   /// before any binary fragments arrive).
   void registerEnvelope(ImageEnvelope envelope) {
-    _sessions.putIfAbsent(
+    if (_ignoredIncomingSessions.contains(envelope.sessionId)) {
-      envelope.sessionId,
+      return;
-      () => ImageSession(
+    }
-        sessionId: envelope.sessionId,
+    final existing = _sessions[envelope.sessionId];
-        format: envelope.format,
+    if (existing == null) {
-        total: envelope.total,
-        width: envelope.width,
-        height: envelope.height,
-      ),
-    );
-    // Update dimensions if we created the session from a fragment (w/h = 0).
-    final session = _sessions[envelope.sessionId]!;
-    if (session.width == 0 || session.height == 0) {
       _sessions[envelope.sessionId] = ImageSession(
         sessionId: envelope.sessionId,
         format: envelope.format,
@@ -126,12 +172,38 @@ class ImageProvider with ChangeNotifier {
         width: envelope.width,
         height: envelope.height,
       );
-      // Copy existing fragments into the new session.
+      unawaited(_persist());
-      final old = _sessions[envelope.sessionId]!;
+      notifyListeners();
-      for (var i = 0; i < session.fragments.length && i < old.total; i++) {
+      return;
-        old.fragments[i] = session.fragments[i];
+    }
+
+    final needsMerge =
+        existing.width == 0 ||
+        existing.height == 0 ||
+        existing.total != envelope.total ||
+        existing.format != envelope.format;
+    if (!needsMerge) {
+      notifyListeners();
+      return;
+    }
+
+    final merged = ImageSession(
+      sessionId: envelope.sessionId,
+      format: envelope.format,
+      total: envelope.total,
+      width: envelope.width,
+      height: envelope.height,
+    );
+    merged.firstFragmentAt = existing.firstFragmentAt;
+    merged.lastFragmentAt = existing.lastFragmentAt;
+    for (final fragment in existing.fragments) {
+      if (fragment == null) continue;
+      if (fragment.index < merged.total) {
+        merged.fragments[fragment.index] = fragment;
       }
     }
+    _sessions[envelope.sessionId] = merged;
+    unawaited(_persist());
     notifyListeners();
   }
 
@@ -183,41 +255,18 @@ class ImageProvider with ChangeNotifier {
       debugPrint('⚠️ [ImageProvider] No cached session for $sessionId');
       return false;
     }
-    if (sendRawPacketCallback == null) {
+    return serveCachedSessionFragments<ImagePacket>(
-      debugPrint('⚠️ [ImageProvider] sendRawPacketCallback not set');
+      providerLabel: 'ImageProvider',
-      return false;
+      sessionId: sessionId,
-    }
+      requester: requester,
-    if (requester.outPathLen < 0) {
+      fragments: cached.fragments,
-      debugPrint('⚠️ [ImageProvider] ${requester.advName} has no direct path');
+      maxDirectPayloadHops: maxDirectPayloadHops,
-      return false;
+      indexOf: (fragment) => fragment.index,
-    }
+      encodeBinary: (fragment) => fragment.encodeBinary(),
-    if (requester.outPathLen > maxDirectPayloadHops) {
+      sendRawPacket: sendRawPacketCallback,
-      debugPrint(
+      waitForFragmentAck: waitForFragmentAckCallback,
-        '⚠️ [ImageProvider] ${requester.advName} is too far: ${requester.outPathLen} hops (max $maxDirectPayloadHops)',
+      requestedIndices: requestedIndices,
     );
-      return false;
-    }
-
-    for (final fragment in cached.fragments) {
-      if (requestedIndices != null &&
-          !requestedIndices.contains(fragment.index)) {
-        continue;
-      }
-      try {
-        await sendRawPacketCallback!(
-          contactPath: requester.outPath,
-          contactPathLen: requester.outPathLen,
-          payload: fragment.encodeBinary(),
-        );
-      } catch (e, st) {
-        debugPrint('❌ [ImageProvider] Serve error for $sessionId: $e\n$st');
-        return false;
-      }
-    }
-    debugPrint(
-      '📷 [ImageProvider] Served ${cached.fragments.length} fragments of $sessionId',
-    );
-    return true;
   }
 
   // ── Persistence ──────────────────────────────────────────────────────────
@@ -225,6 +274,7 @@ class ImageProvider with ChangeNotifier {
   Future<void> clearAll() async {
     _sessions.clear();
     _outgoing.clear();
+    _ignoredIncomingSessions.clear();
     notifyListeners();
     try {
       final prefs = await SharedPreferences.getInstance();

lib/providers/voice_provider.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 import 'package:flutter/foundation.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import '../models/contact.dart';
+import 'helpers/raw_session_retransmit.dart';
 import '../utils/voice_message_parser.dart';
 import '../services/voice_codec_service.dart';
 import '../services/voice_player_service.dart';
@@ -13,6 +14,8 @@ class VoiceSession {
   final VoicePacketMode mode;
   final int total;
   final List<VoicePacket?> packets; // indexed by packet.index
+  DateTime? firstPacketAt;
+  DateTime? lastPacketAt;
 
   VoiceSession({
     required this.sessionId,
@@ -23,6 +26,19 @@ class VoiceSession {
   int get receivedCount => packets.where((p) => p != null).length;
   bool get isComplete => receivedCount == total;
 
+  Duration? estimateRemaining() {
+    if (isComplete) return Duration.zero;
+    if (firstPacketAt == null || lastPacketAt == null) return null;
+    if (receivedCount < 2) return null;
+
+    final elapsedMs = lastPacketAt!.difference(firstPacketAt!).inMilliseconds;
+    if (elapsedMs <= 0) return null;
+    final avgMsPerPacket = elapsedMs / (receivedCount - 1);
+    final remaining = total - receivedCount;
+    if (remaining <= 0) return Duration.zero;
+    return Duration(milliseconds: (avgMsPerPacket * remaining).round());
+  }
+
   /// Total estimated audio duration in seconds (sum of all received packets).
   double get estimatedDurationSeconds {
     var ms = 0;
@@ -43,6 +59,7 @@ class VoiceProvider with ChangeNotifier {
 
   /// Active sessions keyed by sessionId.
   final Map<String, VoiceSession> _sessions = {};
+  final Set<String> _ignoredIncomingSessions = {};
 
   /// Currently playing session ID, or null.
   String? _playingSessionId;
@@ -54,6 +71,12 @@ class VoiceProvider with ChangeNotifier {
     required Uint8List payload,
   })?
   sendRawPacketCallback;
+  Future<bool> Function({
+    required String sessionId,
+    required int index,
+    Duration timeout,
+  })?
+  waitForFragmentAckCallback;
 
   final Map<String, _OutgoingVoiceSession> _outgoingSessions = {};
 
@@ -93,6 +116,10 @@ class VoiceProvider with ChangeNotifier {
 
   bool hasOutgoingSession(String sessionId) =>
       _outgoingSessions.containsKey(sessionId);
+  Duration? estimateRemainingTransferTime(String sessionId) =>
+      _sessions[sessionId]?.estimateRemaining();
+  bool isReceiveCanceled(String sessionId) =>
+      _ignoredIncomingSessions.contains(sessionId);
 
   List<int> missingPacketIndices(String sessionId) {
     final session = _sessions[sessionId];
@@ -109,6 +136,12 @@ class VoiceProvider with ChangeNotifier {
   /// Add an incoming [packet] to its session.  Creates the session on first packet.
   /// Returns true if the session just became complete.
   bool addPacket(VoicePacket packet) {
+    if (_ignoredIncomingSessions.contains(packet.sessionId)) {
+      debugPrint(
+        '⏹️ [VoiceProvider] Ignoring canceled incoming session ${packet.sessionId}',
+      );
+      return false;
+    }
     _sessions.putIfAbsent(
       packet.sessionId,
       () => VoiceSession(
@@ -120,7 +153,13 @@ class VoiceProvider with ChangeNotifier {
 
     final session = _sessions[packet.sessionId]!;
     if (packet.index < session.total) {
+      final wasMissing = session.packets[packet.index] == null;
       session.packets[packet.index] = packet;
+      if (wasMissing) {
+        final now = DateTime.now();
+        session.firstPacketAt ??= now;
+        session.lastPacketAt = now;
+      }
     }
 
     final justComplete = session.isComplete;
@@ -129,6 +168,23 @@ class VoiceProvider with ChangeNotifier {
     return justComplete;
   }
 
+  void cancelIncomingSession(String sessionId) {
+    _ignoredIncomingSessions.add(sessionId);
+    _sessions.remove(sessionId);
+    if (_playingSessionId == sessionId) {
+      unawaited(_player.stop());
+      _playingSessionId = null;
+    }
+    _persistVoiceData();
+    notifyListeners();
+  }
+
+  void resumeIncomingSession(String sessionId) {
+    if (_ignoredIncomingSessions.remove(sessionId)) {
+      notifyListeners();
+    }
+  }
+
   /// Cache encoded packets for deferred voice serving.
   void cacheOutgoingSession(String sessionId, List<VoicePacket> packets) {
     if (packets.isEmpty) return;
@@ -152,42 +208,18 @@ class VoiceProvider with ChangeNotifier {
       );
       return false;
     }
-    if (sendRawPacketCallback == null) {
+    return serveCachedSessionFragments<VoicePacket>(
-      debugPrint('⚠️ [VoiceProvider] sendRawPacketCallback is not set');
+      providerLabel: 'VoiceProvider',
-      return false;
+      sessionId: sessionId,
-    }
+      requester: requester,
-    if (requester.outPathLen < 0) {
+      fragments: cached.packets,
-      debugPrint(
+      maxDirectPayloadHops: maxDirectPayloadHops,
-        '⚠️ [VoiceProvider] Requester ${requester.advName} has no direct path',
+      indexOf: (packet) => packet.index,
+      encodeBinary: (packet) => packet.encodeBinary(),
+      sendRawPacket: sendRawPacketCallback,
+      waitForFragmentAck: waitForFragmentAckCallback,
+      requestedIndices: requestedIndices,
     );
-      return false;
-    }
-    if (requester.outPathLen > maxDirectPayloadHops) {
-      debugPrint(
-        '⚠️ [VoiceProvider] Requester ${requester.advName} is too far: ${requester.outPathLen} hops (max $maxDirectPayloadHops)',
-      );
-      return false;
-    }
-
-    for (final packet in cached.packets) {
-      if (requestedIndices != null &&
-          !requestedIndices.contains(packet.index)) {
-        continue;
-      }
-      try {
-        await sendRawPacketCallback!(
-          contactPath: requester.outPath,
-          contactPathLen: requester.outPathLen,
-          payload: packet.encodeBinary(),
-        );
-      } catch (e, st) {
-        debugPrint(
-          '❌ [VoiceProvider] Failed serving packet for $sessionId: $e\n$st',
-        );
-        return false;
-      }
-    }
-    return true;
   }
 
   // ── Playback ─────────────────────────────────────────────────────────────
@@ -231,6 +263,7 @@ class VoiceProvider with ChangeNotifier {
   Future<void> clearStoredVoiceData() async {
     _sessions.clear();
     _outgoingSessions.clear();
+    _ignoredIncomingSessions.clear();
     _playingSessionId = null;
     notifyListeners();
     try {

lib/screens/home_screen.dart

@@ -23,6 +23,8 @@ import '../widgets/permission_request_dialog.dart';
 import '../widgets/connection_dialog.dart';
 import '../utils/battery_display_helper.dart';
 
+enum _HomeTab { messages, contacts, map }
+
 class HomeScreen extends StatefulWidget {
   final Function(AppThemeMode) onThemeChanged;
   final Function(Locale?) onLocaleChanged;
@@ -50,13 +52,30 @@ class _HomeScreenState extends State<HomeScreen>
   bool _isMapFullscreen = false;
   bool _showRxTxIndicators = true;
   bool _isMapEnabled = true;
+  bool _isContactsEnabled = true;
+
+  List<_HomeTab> get _enabledTabs {
+    return [
+      _HomeTab.messages,
+      if (_isContactsEnabled) _HomeTab.contacts,
+      if (_isMapEnabled) _HomeTab.map,
+    ];
+  }
+
+  _HomeTab get _currentTab {
+    final tabs = _enabledTabs;
+    final safeIndex = _currentIndex < tabs.length
+        ? _currentIndex
+        : tabs.length - 1;
+    return tabs[safeIndex < 0 ? 0 : safeIndex];
+  }
 
   @override
   void initState() {
     super.initState();
     // Initialize synchronously so first build always has a valid controller.
     _initTabController();
-    _loadMapEnabledAndInitTabs();
+    _loadTabVisibilityAndInitTabs();
     _loadRxTxPreference();
 
     // Show permission dialog after the first frame if needed
@@ -67,58 +86,75 @@ class _HomeScreenState extends State<HomeScreen>
     }
   }
 
-  Future<void> _loadMapEnabledAndInitTabs() async {
+  Future<void> _loadTabVisibilityAndInitTabs() async {
     final prefs = await SharedPreferences.getInstance();
     final mapEnabled = prefs.getBool('map_enabled') ?? true;
+    final contactsEnabled = prefs.getBool('contacts_enabled') ?? true;
     if (!mounted) return;
-    if (_isMapEnabled != mapEnabled) {
+    if (_isMapEnabled != mapEnabled || _isContactsEnabled != contactsEnabled) {
-      _updateTabController(mapEnabled);
+      _updateTabController(
+        mapEnabled: mapEnabled,
+        contactsEnabled: contactsEnabled,
+      );
     }
   }
 
   void _initTabController() {
-    final tabCount = _isMapEnabled ? 3 : 2;
+    _tabController = TabController(length: _enabledTabs.length, vsync: this);
-    _tabController = TabController(length: tabCount, vsync: this);
     _tabController.addListener(_onTabChanged);
   }
 
   void _onTabChanged() {
     setState(() {
       _currentIndex = _tabController.index;
-      // Exit fullscreen when switching away from map tab (only if map is enabled and is tab 2)
+      if (_currentTab != _HomeTab.map) {
-      if (_isMapEnabled && _currentIndex != 2) {
         _isMapFullscreen = false;
       }
     });
   }
 
-  void _updateTabController(bool mapEnabled) {
+  void _updateTabController({
-    if (_isMapEnabled == mapEnabled) return;
+    required bool mapEnabled,
+    required bool contactsEnabled,
+  }) {
+    if (_isMapEnabled == mapEnabled && _isContactsEnabled == contactsEnabled) {
+      return;
+    }
 
-    // Save current index before rebuilding
+    final oldTabs = _enabledTabs;
     final oldIndex = _tabController.index;
+    final oldTab = oldTabs[oldIndex];
 
-    // Remove old listener and dispose
+    final oldController = _tabController;
-    _tabController.removeListener(_onTabChanged);
+    oldController.removeListener(_onTabChanged);
-    _tabController.dispose();
 
     // Update state
     _isMapEnabled = mapEnabled;
+    _isContactsEnabled = contactsEnabled;
+
+    final newTabs = _enabledTabs;
+    final newIndex = newTabs.indexOf(oldTab);
 
     // Create new controller
-    final tabCount = mapEnabled ? 3 : 2;
+    _tabController = TabController(length: newTabs.length, vsync: this);
-    _tabController = TabController(length: tabCount, vsync: this);
     _tabController.addListener(_onTabChanged);
 
-    // Restore index (clamp to valid range)
+    _currentIndex = newIndex >= 0 ? newIndex : 0;
-    if (oldIndex < tabCount) {
+    _tabController.index = _currentIndex;
-      _tabController.index = oldIndex;
-      _currentIndex = oldIndex;
-    } else {
-      _currentIndex = tabCount - 1;
-    }
 
     setState(() {});
+
+    // Dispose old controller after widgets have rebound to the new controller.
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      oldController.dispose();
+    });
+  }
+
+  void _navigateToTab(_HomeTab tab) {
+    final targetIndex = _enabledTabs.indexOf(tab);
+    if (targetIndex >= 0 && targetIndex != _tabController.index) {
+      _tabController.animateTo(targetIndex);
+    }
   }
 
   Future<void> _loadRxTxPreference() async {
@@ -276,18 +312,23 @@ class _HomeScreenState extends State<HomeScreen>
       messagesProvider.setLocalizations(localizations);
     }
 
-    // Check if map enabled setting changed and update tab controller
+    // Check if tab visibility settings changed and update tab controller
     final appProvider = context.watch<AppProvider>();
-    if (_isMapEnabled != appProvider.isMapEnabled) {
+    if (_isMapEnabled != appProvider.isMapEnabled ||
+        _isContactsEnabled != appProvider.isContactsEnabled) {
       WidgetsBinding.instance.addPostFrameCallback((_) {
         if (!mounted) return;
-        _updateTabController(appProvider.isMapEnabled);
+        _updateTabController(
+          mapEnabled: appProvider.isMapEnabled,
+          contactsEnabled: appProvider.isContactsEnabled,
+        );
       });
     }
 
-    // Determine if we should hide the UI (only in fullscreen on map tab)
+    final enabledTabs = _enabledTabs;
-    final shouldHideUI =
+    final isMapTabActive = _currentTab == _HomeTab.map;
-        _isMapEnabled && _isMapFullscreen && _currentIndex == 2;
+    final shouldHideUI = _isMapEnabled && _isMapFullscreen && isMapTabActive;
+    final shouldShowTabBar = enabledTabs.length > 1;
 
     return Scaffold(
       appBar: shouldHideUI
@@ -374,29 +415,33 @@ class _HomeScreenState extends State<HomeScreen>
             ),
       body: TabBarView(
         controller: _tabController,
-        children: [
+        children: enabledTabs.map((tab) {
-          MessagesTab(
+          switch (tab) {
+            case _HomeTab.messages:
+              return MessagesTab(
                 onNavigateToMap: _isMapEnabled
-                ? () => _tabController.animateTo(2)
+                    ? () => _navigateToTab(_HomeTab.map)
                     : null,
-          ),
+              );
-          ContactsTab(
+            case _HomeTab.contacts:
+              return ContactsTab(
                 onNavigateToMap: _isMapEnabled
-                ? () => _tabController.animateTo(2)
+                    ? () => _navigateToTab(_HomeTab.map)
                     : null,
-          ),
+              );
-          if (_isMapEnabled)
+            case _HomeTab.map:
-            MapTab(
+              return MapTab(
                 onFullscreenChanged: (isFullscreen) {
                   setState(() {
                     _isMapFullscreen = isFullscreen;
                   });
                 },
-              onNavigateToMessages: () => _tabController.animateTo(0),
+                onNavigateToMessages: () => _navigateToTab(_HomeTab.messages),
+              );
+          }
+        }).toList(),
       ),
-        ],
+      bottomNavigationBar: shouldHideUI || !shouldShowTabBar
-      ),
-      bottomNavigationBar: shouldHideUI
           ? null
           : Consumer2<MessagesProvider, ContactsProvider>(
               builder: (context, messagesProvider, contactsProvider, child) {
@@ -415,27 +460,31 @@ class _HomeScreenState extends State<HomeScreen>
                   ),
                   child: TabBar(
                     controller: _tabController,
-                    tabs: [
+                    tabs: enabledTabs.map((tab) {
-                      Tab(
+                      switch (tab) {
+                        case _HomeTab.messages:
+                          return Tab(
                             icon: _buildTabIconWithBadge(
                               Icons.message,
                               unreadCount,
                             ),
                             text: AppLocalizations.of(context)!.messages,
-                      ),
+                          );
-                      Tab(
+                        case _HomeTab.contacts:
+                          return Tab(
                             icon: _buildTabIconWithBadge(
                               Icons.contacts,
                               newContactsCount,
                             ),
                             text: AppLocalizations.of(context)!.contacts,
-                      ),
+                          );
-                      if (_isMapEnabled)
+                        case _HomeTab.map:
-                        Tab(
+                          return Tab(
                             icon: const Icon(Icons.map),
                             text: AppLocalizations.of(context)!.map,
-                        ),
+                          );
-                    ],
+                      }
+                    }).toList(),
                   ),
                 );
               },

lib/screens/messages_tab.dart

@@ -27,6 +27,7 @@ import '../utils/toast_logger.dart';
 import '../utils/key_comparison.dart';
 import '../utils/voice_message_parser.dart';
 import '../utils/image_message_parser.dart';
+import '../utils/tictactoe_message_parser.dart';
 import '../providers/image_provider.dart' as ip;
 import '../services/image_codec_service.dart';
 import '../services/image_preferences.dart';
@@ -286,6 +287,61 @@ class _MessagesTabState extends State<MessagesTab> {
     return 'Select recipient';
   }
 
+  String _getCurrentScopeLabel() {
+    if (_destinationType ==
+        MessageDestinationPreferences.destinationTypeChannel) {
+      final channelName =
+          _selectedRecipient?.getLocalizedDisplayName(context) ??
+          AppLocalizations.of(context)!.publicChannel;
+      return 'Channel > $channelName';
+    }
+
+    if (_destinationType == MessageDestinationPreferences.destinationTypeRoom) {
+      final roomName =
+          _selectedRecipient?.displayName ??
+          AppLocalizations.of(context)!.messages;
+      return 'Room > $roomName';
+    }
+
+    final contactName =
+        _selectedRecipient?.displayName ??
+        AppLocalizations.of(context)!.messages;
+    return 'Direct > $contactName';
+  }
+
+  Widget _buildScopeIndicator() {
+    final theme = Theme.of(context);
+
+    return SizedBox(
+      width: double.infinity,
+      child: Align(
+        alignment: Alignment.centerLeft,
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(
+              Icons.visibility_outlined,
+              size: 14,
+              color: theme.colorScheme.onSurfaceVariant,
+            ),
+            const SizedBox(width: 6),
+            Flexible(
+              child: Text(
+                'View: ${_getCurrentScopeLabel()}',
+                maxLines: 1,
+                overflow: TextOverflow.ellipsis,
+                textAlign: TextAlign.left,
+                style: theme.textTheme.labelSmall?.copyWith(
+                  color: theme.colorScheme.onSurfaceVariant,
+                ),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
   Future<void> _sendMessage() async {
     final text = _textController.text.trim();
     if (text.isEmpty) return;
@@ -428,6 +484,54 @@ class _MessagesTabState extends State<MessagesTab> {
     }
   }
 
+  Future<void> _startTicTacToeGame() async {
+    if (!mounted) return;
+    if (_destinationType !=
+            MessageDestinationPreferences.destinationTypeContact ||
+        _selectedRecipient == null) {
+      ToastLogger.warning(
+        context,
+        'Tic-Tac-Toe works only in direct messages. Choose a contact first.',
+      );
+      return;
+    }
+
+    final connectionProvider = context.read<ConnectionProvider>();
+    final messagesProvider = context.read<MessagesProvider>();
+    final contactsProvider = context.read<ContactsProvider>();
+    if (!connectionProvider.deviceInfo.isConnected) {
+      ToastLogger.error(context, 'Not connected to device');
+      return;
+    }
+
+    final devicePublicKey = connectionProvider.deviceInfo.publicKey;
+    if (devicePublicKey == null || devicePublicKey.length < 6) {
+      ToastLogger.error(context, 'Device key unavailable');
+      return;
+    }
+
+    final gameId = List.generate(
+      8,
+      (_) => math.Random.secure().nextInt(16).toRadixString(16),
+    ).join();
+    final starterKey6 = devicePublicKey
+        .sublist(0, 6)
+        .map((b) => b.toRadixString(16).padLeft(2, '0'))
+        .join('');
+    final startMessage = TicTacToeMessageParser.encodeStart(
+      gameId: gameId,
+      starterKey6: starterKey6,
+      timestampSec: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+    );
+
+    await _sendToRecipient(
+      startMessage,
+      connectionProvider,
+      messagesProvider,
+      contactsProvider,
+    );
+  }
+
   // ── Image sending ───────────────────────────────────────────────────────────
 
   Future<void> _pickAndSendImage({
@@ -592,21 +696,8 @@ class _MessagesTabState extends State<MessagesTab> {
         'chunk=${imageDataBytesPerFragment}B',
       );
 
-      // Push all fragments immediately for direct contacts.
+      // Image fragments are always served on demand after an explicit IR2
-      // For channels, fragments are served on demand via IR1 fetch requests.
+      // fetch request, including direct contacts.
-      if (!isChannel && recipient != null) {
-        // Small delay so the IE1 envelope can propagate before fragments arrive.
-        await Future.delayed(const Duration(milliseconds: 500));
-        if (!mounted) return;
-        final served = await imageProvider.serveSessionTo(
-          sessionId: sessionId,
-          requester: recipient,
-        );
-        debugPrint(
-          '📷 [Image] Pushed ${served ? fragments.length : 0} '
-          'fragments to ${recipient.advName}',
-        );
-      }
     } catch (e, st) {
       debugPrint('❌ [Image] _pickAndSendImage: $e\n$st');
       if (!mounted) return;
@@ -1077,6 +1168,15 @@ class _MessagesTabState extends State<MessagesTab> {
                         _pickAndSendImage(source: ImageSource.camera);
                       },
               ),
+              ListTile(
+                leading: const Icon(Icons.grid_3x3),
+                title: const Text('Start Tic-Tac-Toe'),
+                subtitle: const Text('DM only'),
+                onTap: () {
+                  Navigator.pop(sheetContext);
+                  _startTicTacToeGame();
+                },
+              ),
             ],
           ),
         );
@@ -1513,14 +1613,23 @@ class _MessagesTabState extends State<MessagesTab> {
                   ),
                 ),
               ),
-              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 8),
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  Padding(
+                    padding: const EdgeInsets.symmetric(
+                      horizontal: 8,
+                      vertical: 8,
+                    ),
                     child: Row(
                       crossAxisAlignment: CrossAxisAlignment.end,
                       children: [
                         // Quick actions (+) button
                         IconButton(
                           icon: Icon(_isRecording ? Icons.stop : Icons.add),
-                    tooltip: _isRecording ? 'Stop recording' : 'More actions',
+                          tooltip: _isRecording
+                              ? 'Stop recording'
+                              : 'More actions',
                           onPressed: _isRecording
                               ? _stopAndSendVoice
                               : _showComposerActions,
@@ -1530,7 +1639,9 @@ class _MessagesTabState extends State<MessagesTab> {
                             ).colorScheme.primaryContainer,
                             foregroundColor: _isRecording
                                 ? Colors.red
-                          : Theme.of(context).colorScheme.onPrimaryContainer,
+                                : Theme.of(
+                                    context,
+                                  ).colorScheme.onPrimaryContainer,
                           ),
                         ),
                         const SizedBox(width: 4),
@@ -1547,27 +1658,46 @@ class _MessagesTabState extends State<MessagesTab> {
                                 ? Theme.of(
                                     context,
                                   ).colorScheme.surfaceContainerHighest
-                          : Theme.of(context).colorScheme.secondaryContainer,
+                                : Theme.of(
+                                    context,
+                                  ).colorScheme.secondaryContainer,
                             foregroundColor:
                                 _destinationType ==
                                     MessageDestinationPreferences
                                         .destinationTypeChannel
                                 ? Theme.of(context).colorScheme.onSurface
-                          : Theme.of(context).colorScheme.onSecondaryContainer,
+                                : Theme.of(
+                                    context,
+                                  ).colorScheme.onSecondaryContainer,
                           ),
                         ),
                         const SizedBox(width: 4),
-                  // Text field with embedded send button
+                        // Scope label + text field share the same alignment
                         Expanded(
-                    child: TextField(
+                          child: Column(
+                            mainAxisSize: MainAxisSize.min,
+                            crossAxisAlignment: CrossAxisAlignment.start,
+                            children: [
+                              Padding(
+                                padding: const EdgeInsets.only(
+                                  left: 4,
+                                  right: 4,
+                                  bottom: 6,
+                                ),
+                                child: _buildScopeIndicator(),
+                              ),
+                              TextField(
                                 controller: _textController,
                                 focusNode: _focusNode,
                                 maxLength: _maxCharacters,
                                 maxLines: null,
-                      maxLengthEnforcement: MaxLengthEnforcement.enforced,
+                                maxLengthEnforcement:
+                                    MaxLengthEnforcement.enforced,
                                 style: const TextStyle(fontSize: 14),
                                 decoration: InputDecoration(
-                        hintText: AppLocalizations.of(context)!.typeYourMessage,
+                                  hintText: AppLocalizations.of(
+                                    context,
+                                  )!.typeYourMessage,
                                   hintStyle: const TextStyle(fontSize: 14),
                                   border: OutlineInputBorder(
                                     borderRadius: BorderRadius.circular(24),
@@ -1582,19 +1712,24 @@ class _MessagesTabState extends State<MessagesTab> {
                                       : '',
                                   counterStyle: TextStyle(
                                     fontSize: 10,
-                          color: _characterCount > _maxCharacters * 0.9
+                                    color:
+                                        _characterCount > _maxCharacters * 0.9
                                         ? Colors.orange
-                              : Theme.of(context).textTheme.bodySmall?.color,
+                                        : Theme.of(
+                                            context,
+                                          ).textTheme.bodySmall?.color,
                                   ),
                                   suffixIcon: GestureDetector(
                                     onLongPressStart:
                                         (_voiceSupported && !_isSendingVoice)
                                         ? (_) => _startVoiceRecording()
                                         : null,
-                          onLongPressEnd: (_voiceSupported && _isRecording)
+                                    onLongPressEnd:
+                                        (_voiceSupported && _isRecording)
                                         ? (_) => _stopAndSendVoice()
                                         : null,
-                          onLongPressCancel: (_voiceSupported && _isRecording)
+                                    onLongPressCancel:
+                                        (_voiceSupported && _isRecording)
                                         ? () => _stopAndSendVoice()
                                         : null,
                                     child: IconButton(
@@ -1613,16 +1748,22 @@ class _MessagesTabState extends State<MessagesTab> {
                                               size: 22,
                                               color: _isRecording
                                                   ? Colors.red
-                                        : (_textController.text.trim().isEmpty
+                                                  : (_textController.text
-                                              ? Theme.of(context).disabledColor
+                                                            .trim()
-                                              : Theme.of(
+                                                            .isEmpty
+                                                        ? Theme.of(
                                                             context,
-                                                ).colorScheme.primary),
+                                                          ).disabledColor
+                                                        : Theme.of(context)
+                                                              .colorScheme
+                                                              .primary),
                                             ),
                                       onPressed:
                                           _isRecording ||
                                               _isSendingVoice ||
-                                    _textController.text.trim().isEmpty
+                                              _textController.text
+                                                  .trim()
+                                                  .isEmpty
                                           ? null
                                           : _sendMessage,
                                       tooltip: _isRecording
@@ -1638,6 +1779,11 @@ class _MessagesTabState extends State<MessagesTab> {
                                 textInputAction: TextInputAction.send,
                                 onSubmitted: (_) => _sendMessage(),
                               ),
+                            ],
+                          ),
+                        ),
+                      ],
+                    ),
                   ),
                 ],
               ),

lib/screens/settings_screen.dart

@@ -621,6 +621,46 @@ class _SettingsScreenState extends State<SettingsScreen> {
     );
   }
 
+  Future<void> _clearMessages() async {
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Clear Messages'),
+        content: const Text(
+          'This will permanently delete all stored messages. Are you sure?',
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: Text(AppLocalizations.of(context)!.cancel),
+          ),
+          TextButton(
+            onPressed: () => Navigator.pop(context, true),
+            style: TextButton.styleFrom(foregroundColor: Colors.red),
+            child: Text(AppLocalizations.of(context)!.clear),
+          ),
+        ],
+      ),
+    );
+
+    if (confirmed != true || !mounted) return;
+
+    final messagesProvider = Provider.of<MessagesProvider>(
+      context,
+      listen: false,
+    );
+    messagesProvider.clearMessages();
+
+    if (!mounted) return;
+
+    ScaffoldMessenger.of(context).showSnackBar(
+      const SnackBar(
+        content: Text('All messages cleared'),
+        backgroundColor: Colors.orange,
+      ),
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -687,6 +727,19 @@ class _SettingsScreenState extends State<SettingsScreen> {
               },
             ),
           ),
+          Consumer<AppProvider>(
+            builder: (context, appProvider, child) => SwitchListTile(
+              secondary: const Icon(Icons.contacts_outlined),
+              title: const Text('Disable Contacts'),
+              subtitle: const Text(
+                'Hide the contacts tab to simplify navigation',
+              ),
+              value: !appProvider.isContactsEnabled,
+              onChanged: (value) async {
+                await appProvider.toggleContactsEnabled(!value);
+              },
+            ),
+          ),
           ListTile(
             leading: const Icon(Icons.language),
             title: Text(AppLocalizations.of(context)!.language),
@@ -694,6 +747,15 @@ class _SettingsScreenState extends State<SettingsScreen> {
             trailing: const Icon(Icons.chevron_right),
             onTap: () => _showLanguageDialog(),
           ),
+          ListTile(
+            leading: const Icon(Icons.delete_sweep, color: Colors.red),
+            title: const Text(
+              'Clear Messages',
+              style: TextStyle(color: Colors.red),
+            ),
+            subtitle: const Text('Delete all stored message history'),
+            onTap: _clearMessages,
+          ),
           const Divider(),
 
           // Voice Settings Section

lib/services/cayenne_lpp_parser.dart

@@ -25,6 +25,14 @@ class CayenneLppParser {
 
     int fieldCount = 0;
     while (reader.hasRemaining) {
+      if (fieldCount > 0 && _isZeroPaddedTail(data, reader.remainingBytesCount)) {
+        debugPrint(
+          '    Detected zero-padded telemetry tail, stopping parse at position '
+          '${data.length - reader.remainingBytesCount}',
+        );
+        break;
+      }
+
       try {
         fieldCount++;
         debugPrint(
@@ -250,6 +258,14 @@ class CayenneLppParser {
     return ((voltage - 3.0) / 1.2) * 100.0;
   }
 
+  static bool _isZeroPaddedTail(Uint8List data, int remainingBytes) {
+    final start = data.length - remainingBytes;
+    for (int i = start; i < data.length; i++) {
+      if (data[i] != 0) return false;
+    }
+    return remainingBytes > 0;
+  }
+
   /// Create Cayenne LPP data for GPS location
   /// Standard Cayenne LPP GPS format (type 0x88):
   /// - Latitude: 3 bytes, signed 24-bit, big-endian, × 10000

lib/utils/image_message_parser.dart

@@ -125,7 +125,10 @@ int safeImageDataBytesForPath(int pathLen) {
       ? maxRawPayloadFromCommandFrame
       : maxRawPayloadFromMesh;
   final maxData = maxRawPayload - ImagePacket._headerLen;
-  return maxData.clamp(1, 255).toInt();
+  // Keep a safety margin below the theoretical direct-route ceiling.
+  // Fragments at the absolute 172-byte command-frame limit have proven flaky
+  // in practice, so cap to the conservative protocol default.
+  return maxData.clamp(1, ImagePacket.maxDataBytes).toInt();
 }
 
 /// Approximate end-to-end transmit time for image fragments on MeshCore LoRa.
@@ -243,11 +246,11 @@ int _resolveBandwidthHz(int? rawBw) {
 /// Envelope announcing image availability (control plane).
 ///
 /// Text format:
-///   IE1:{sid}:{fmt}:{total}:{w}:{h}:{bytes}:{senderKey6}:{ts}:{ver}
+///   IE2:{sid}:{fmt}:{total}:{w}:{h}:{bytes}:{senderKey6}:{ts}
 /// Example:
-///   IE1:deadbeef:0:7:128:128:1050:aabbccddeeff:1700000000:1
+///   IE2:deadbeef:0:7:3k:3k:t6:aabbccddeeff:s44we8
 class ImageEnvelope {
-  static const String prefix = 'IE1:';
+  static const String _prefix = 'IE2:';
 
   final String sessionId; // 8 hex chars
   final ImageFormat format;
@@ -268,38 +271,36 @@ class ImageEnvelope {
     required this.sizeBytes,
     required this.senderKey6,
     required this.timestampSec,
-    this.version = 1,
+    this.version = 2,
   });
 
-  static bool isEnvelope(String text) => text.startsWith(prefix);
+  static bool isEnvelope(String text) => text.startsWith(_prefix);
 
   static ImageEnvelope? tryParse(String text) {
     if (!isEnvelope(text)) return null;
-    final body = text.substring(prefix.length);
+    final body = text.substring(_prefix.length);
     final parts = body.split(':');
-    if (parts.length != 9) return null;
+    if (parts.length != 8) return null;
     try {
-      final sid = parts[0];
+      final sid = _decodeSessionId(parts[0]);
-      final fmtId = int.tryParse(parts[1]);
+      final fmtId = _parseInt(parts[1], base36: true);
-      final total = int.tryParse(parts[2]);
+      final total = _parseInt(parts[2], base36: true);
-      final w = int.tryParse(parts[3]);
+      final w = _parseInt(parts[3], base36: true);
-      final h = int.tryParse(parts[4]);
+      final h = _parseInt(parts[4], base36: true);
-      final bytes = int.tryParse(parts[5]);
+      final bytes = _parseInt(parts[5], base36: true);
       final senderKey6 = parts[6];
-      final ts = int.tryParse(parts[7]);
+      final ts = _parseInt(parts[7], base36: true);
-      final ver = int.tryParse(parts[8]);
 
-      if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sid)) return null;
+      if (sid == null) return null;
       if (fmtId == null) return null;
       if (total == null || total < 1 || total > 255) return null;
       if (w == null || h == null || w < 1 || h < 1) return null;
       if (bytes == null || bytes < 1) return null;
       if (!RegExp(r'^[0-9a-fA-F]{12}$').hasMatch(senderKey6)) return null;
       if (ts == null || ts <= 0) return null;
-      if (ver == null || ver != 1) return null;
 
       return ImageEnvelope(
-        sessionId: sid.toLowerCase(),
+        sessionId: sid,
         format: ImageFormat.fromId(fmtId),
         total: total,
         width: w,
@@ -307,7 +308,7 @@ class ImageEnvelope {
         sizeBytes: bytes,
         senderKey6: senderKey6.toLowerCase(),
         timestampSec: ts,
-        version: ver,
+        version: 2,
       );
     } catch (_) {
       return null;
@@ -315,17 +316,21 @@ class ImageEnvelope {
   }
 
   String encode() =>
-      '$prefix${sessionId.toLowerCase()}:${format.id}:$total:$width:$height:$sizeBytes:${senderKey6.toLowerCase()}:$timestampSec:$version';
+      '$_prefix${_encodeSessionId(sessionId)}:'
+      '${_toBase36(format.id)}:${_toBase36(total)}:${_toBase36(width)}:'
+      '${_toBase36(height)}:${_toBase36(sizeBytes)}:'
+      '${senderKey6.toLowerCase()}:${_toBase36(timestampSec)}';
 }
 
 /// Direct request to fetch image fragments (control plane).
 ///
 /// Text format:
-///   IR1:{sid}:{want}:{requesterKey6}:{ts}:{ver}
+///   IR2:{sid}:{want}:{requesterKey6}:{ts}
 /// Example:
-///   IR1:deadbeef:a:aabbccddeeff:1700000010:1
+///   IR2:deadbeef:a:aabbccddeeff:s44wea
 class ImageFetchRequest {
-  static const String prefix = 'IR1:';
+  static const String _prefix = 'IR2:';
+  static const int _binaryMagic = 0x69; // 'i'
 
   final String sessionId;
   final String want; // 'all' or 'missing'
@@ -340,51 +345,87 @@ class ImageFetchRequest {
     this.missingIndices = const [],
     required this.requesterKey6,
     required this.timestampSec,
-    this.version = 1,
+    this.version = 2,
   });
 
-  static bool isRequest(String text) => text.startsWith(prefix);
+  static bool isRequest(String text) => text.startsWith(_prefix);
+  static bool isRequestBinary(Uint8List payload) =>
+      payload.isNotEmpty && payload[0] == _binaryMagic;
 
   static ImageFetchRequest? tryParse(String text) {
     if (!isRequest(text)) return null;
-    final body = text.substring(prefix.length);
+    final body = text.substring(_prefix.length);
     final parts = body.split(':');
-    if (parts.length != 5) return null;
+    if (parts.length != 4) return null;
     try {
-      final sid = parts[0];
+      final sid = _decodeSessionId(parts[0]);
       final wantToken = parts[1];
       final requesterKey6 = parts[2];
-      final ts = int.tryParse(parts[3]);
+      final ts = _parseInt(parts[3], base36: true);
-      final ver = int.tryParse(parts[4]);
       final normalizedWant = wantToken == 'a'
           ? 'all'
-          : (wantToken.startsWith('m-') ? 'missing' : wantToken);
+          : ((wantToken.startsWith('m')) ? 'missing' : wantToken);
 
-      if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sid)) return null;
+      if (sid == null) return null;
       final missingIndices = <int>[];
       if (normalizedWant == 'missing') {
-        final encoded = wantToken.substring(2);
+        final encoded = wantToken.substring(1);
         if (encoded.isEmpty) return null;
-        for (final raw in encoded.split(',')) {
+        missingIndices.addAll(_decodeMissingIndicesCompact(encoded));
-          final idx = int.tryParse(raw);
-          if (idx == null || idx < 0 || idx > 254) return null;
-          missingIndices.add(idx);
-        }
         if (missingIndices.isEmpty) return null;
       } else if (normalizedWant != 'all') {
         return null;
       }
       if (!RegExp(r'^[0-9a-fA-F]{12}$').hasMatch(requesterKey6)) return null;
       if (ts == null || ts <= 0) return null;
-      if (ver == null || ver != 1) return null;
 
       return ImageFetchRequest(
-        sessionId: sid.toLowerCase(),
+        sessionId: sid,
         want: normalizedWant,
         missingIndices: missingIndices,
         requesterKey6: requesterKey6.toLowerCase(),
         timestampSec: ts,
-        version: ver,
+        version: 2,
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  static ImageFetchRequest? tryParseBinary(Uint8List payload) {
+    if (!isRequestBinary(payload)) return null;
+    if (payload.length < 17) return null; // magic+sid+flags+key6+ts+count
+    try {
+      final sid = payload
+          .sublist(1, 5)
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .join()
+          .toLowerCase();
+      final flags = payload[5];
+      final requesterKey6 = payload
+          .sublist(6, 12)
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .join()
+          .toLowerCase();
+      final ts =
+          (payload[12] << 24) |
+          (payload[13] << 16) |
+          (payload[14] << 8) |
+          payload[15];
+      final missingCount = payload[16];
+      if (payload.length != 17 + missingCount) return null;
+      final wantMissing = (flags & 0x01) == 0x01;
+      final missing = <int>[];
+      for (var i = 0; i < missingCount; i++) {
+        missing.add(payload[17 + i]);
+      }
+      return ImageFetchRequest(
+        sessionId: sid,
+        want: wantMissing ? 'missing' : 'all',
+        missingIndices: missing,
+        requesterKey6: requesterKey6,
+        timestampSec: ts,
+        version: 2,
       );
     } catch (_) {
       return null;
@@ -393,10 +434,171 @@ class ImageFetchRequest {
 
   String encode() {
     final wantToken = want == 'missing' && missingIndices.isNotEmpty
-        ? 'm-${missingIndices.join(',')}'
+        ? 'm${_encodeMissingIndicesCompact(missingIndices)}'
         : (want == 'all' ? 'a' : want);
-    return '$prefix${sessionId.toLowerCase()}:$wantToken:${requesterKey6.toLowerCase()}:$timestampSec:$version';
+    return '$_prefix${_encodeSessionId(sessionId)}:$wantToken:${requesterKey6.toLowerCase()}:${_toBase36(timestampSec)}';
   }
+
+  Uint8List encodeBinary() {
+    if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sessionId)) {
+      throw ArgumentError.value(sessionId, 'sessionId', 'Expected 8 hex chars');
+    }
+    if (!RegExp(r'^[0-9a-fA-F]{12}$').hasMatch(requesterKey6)) {
+      throw ArgumentError.value(
+        requesterKey6,
+        'requesterKey6',
+        'Expected 12 hex chars',
+      );
+    }
+    final useMissing = want == 'missing' && missingIndices.isNotEmpty;
+    final missing = useMissing
+        ? missingIndices.where((v) => v >= 0 && v <= 254).toList()
+        : <int>[];
+
+    final out = Uint8List(17 + missing.length);
+    out[0] = _binaryMagic;
+    for (var i = 0; i < 4; i++) {
+      out[1 + i] = int.parse(sessionId.substring(i * 2, i * 2 + 2), radix: 16);
+    }
+    out[5] = useMissing ? 0x01 : 0x00;
+    for (var i = 0; i < 6; i++) {
+      out[6 + i] = int.parse(
+        requesterKey6.substring(i * 2, i * 2 + 2),
+        radix: 16,
+      );
+    }
+    out[12] = (timestampSec >> 24) & 0xFF;
+    out[13] = (timestampSec >> 16) & 0xFF;
+    out[14] = (timestampSec >> 8) & 0xFF;
+    out[15] = timestampSec & 0xFF;
+    out[16] = missing.length;
+    for (var i = 0; i < missing.length; i++) {
+      out[17 + i] = missing[i];
+    }
+    return out;
+  }
+}
+
+/// Per-fragment ACK for raw image payload packets.
+///
+/// Binary format:
+///   [0x6a 'j'][sessionId:4B][index:1B]
+class ImageFragmentAck {
+  static const int _binaryMagic = 0x6a; // 'j'
+
+  final String sessionId; // 8 hex chars
+  final int index; // 0..254
+
+  const ImageFragmentAck({required this.sessionId, required this.index});
+
+  static bool isImageFragmentAckBinary(Uint8List payload) =>
+      payload.length == 6 && payload[0] == _binaryMagic;
+
+  static ImageFragmentAck? tryParseBinary(Uint8List payload) {
+    if (!isImageFragmentAckBinary(payload)) return null;
+    try {
+      final sid = payload
+          .sublist(1, 5)
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .join()
+          .toLowerCase();
+      final idx = payload[5];
+      return ImageFragmentAck(sessionId: sid, index: idx);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Uint8List encodeBinary() {
+    if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sessionId)) {
+      throw ArgumentError.value(sessionId, 'sessionId', 'Expected 8 hex chars');
+    }
+    if (index < 0 || index > 254) {
+      throw ArgumentError.value(index, 'index', 'Expected 0..254');
+    }
+    final out = Uint8List(6);
+    out[0] = _binaryMagic;
+    for (var i = 0; i < 4; i++) {
+      out[1 + i] = int.parse(sessionId.substring(i * 2, i * 2 + 2), radix: 16);
+    }
+    out[5] = index;
+    return out;
+  }
+}
+
+int? _parseInt(String token, {required bool base36}) =>
+    int.tryParse(token, radix: base36 ? 36 : 10);
+
+String _toBase36(int value) => value.toRadixString(36);
+
+String _encodeSessionId(String sessionIdHex) {
+  if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sessionIdHex)) {
+    throw ArgumentError.value(
+      sessionIdHex,
+      'sessionIdHex',
+      'Expected 8 hex chars',
+    );
+  }
+  final value = int.parse(sessionIdHex, radix: 16);
+  return value.toRadixString(36);
+}
+
+String? _decodeSessionId(String token) {
+  if (!RegExp(r'^[0-9a-z]{1,7}$').hasMatch(token)) return null;
+  final value = int.tryParse(token, radix: 36);
+  if (value == null || value < 0 || value > 0xFFFFFFFF) return null;
+  return value.toRadixString(16).padLeft(8, '0');
+}
+
+String _encodeMissingIndicesCompact(List<int> indices) {
+  final sorted = indices.where((v) => v >= 0 && v <= 254).toSet().toList()
+    ..sort();
+  if (sorted.isEmpty) return '';
+  final chunks = <String>[];
+  var start = sorted.first;
+  var prev = sorted.first;
+  for (var i = 1; i < sorted.length; i++) {
+    final curr = sorted[i];
+    if (curr == prev + 1) {
+      prev = curr;
+      continue;
+    }
+    chunks.add(
+      start == prev
+          ? _toBase36(start)
+          : '${_toBase36(start)}-${_toBase36(prev)}',
+    );
+    start = curr;
+    prev = curr;
+  }
+  chunks.add(
+    start == prev ? _toBase36(start) : '${_toBase36(start)}-${_toBase36(prev)}',
+  );
+  return chunks.join('.');
+}
+
+List<int> _decodeMissingIndicesCompact(String encoded) {
+  final out = <int>[];
+  for (final token in encoded.split('.')) {
+    if (token.isEmpty) continue;
+    if (!token.contains('-')) {
+      final value = int.tryParse(token, radix: 36);
+      if (value == null || value < 0 || value > 254) return const [];
+      out.add(value);
+      continue;
+    }
+    final parts = token.split('-');
+    if (parts.length != 2) return const [];
+    final start = int.tryParse(parts[0], radix: 36);
+    final end = int.tryParse(parts[1], radix: 36);
+    if (start == null || end == null || start < 0 || end > 254 || start > end) {
+      return const [];
+    }
+    for (var i = start; i <= end; i++) {
+      out.add(i);
+    }
+  }
+  return out;
 }
 
 /// Fragment the compressed image bytes into [ImagePacket] list.

lib/utils/tictactoe_message_parser.dart

@@ -0,0 +1,163 @@
+enum TicTacToeEventType { start, move }
+
+class TicTacToeEvent {
+  final TicTacToeEventType type;
+  final String gameId;
+  final String playerKey6;
+  final int? cell;
+  final int timestampSec;
+
+  const TicTacToeEvent({
+    required this.type,
+    required this.gameId,
+    required this.playerKey6,
+    this.cell,
+    required this.timestampSec,
+  });
+}
+
+class TicTacToeMessageParser {
+  static const String _prefix = 'TTT1:';
+
+  static bool isTicTacToe(String text) => text.startsWith(_prefix);
+
+  static TicTacToeEvent? tryParse(String text) {
+    if (!isTicTacToe(text)) return null;
+    final body = text.substring(_prefix.length);
+    final parts = body.split(':');
+    if (parts.length < 4) return null;
+
+    final action = parts[0];
+    final gameId = parts[1].toLowerCase();
+    if (!RegExp(r'^[0-9a-f]{8}$').hasMatch(gameId)) return null;
+
+    if (action == 'S' && parts.length == 4) {
+      final starterKey6 = parts[2].toLowerCase();
+      final ts = int.tryParse(parts[3]);
+      if (!RegExp(r'^[0-9a-f]{12}$').hasMatch(starterKey6)) return null;
+      if (ts == null || ts <= 0) return null;
+      return TicTacToeEvent(
+        type: TicTacToeEventType.start,
+        gameId: gameId,
+        playerKey6: starterKey6,
+        timestampSec: ts,
+      );
+    }
+
+    if (action == 'M' && parts.length == 5) {
+      final cell = int.tryParse(parts[2]);
+      final playerKey6 = parts[3].toLowerCase();
+      final ts = int.tryParse(parts[4]);
+      if (cell == null || cell < 0 || cell > 8) return null;
+      if (!RegExp(r'^[0-9a-f]{12}$').hasMatch(playerKey6)) return null;
+      if (ts == null || ts <= 0) return null;
+      return TicTacToeEvent(
+        type: TicTacToeEventType.move,
+        gameId: gameId,
+        playerKey6: playerKey6,
+        cell: cell,
+        timestampSec: ts,
+      );
+    }
+
+    return null;
+  }
+
+  static String encodeStart({
+    required String gameId,
+    required String starterKey6,
+    required int timestampSec,
+  }) {
+    return '$_prefix'
+        'S:${gameId.toLowerCase()}:${starterKey6.toLowerCase()}:$timestampSec';
+  }
+
+  static String encodeMove({
+    required String gameId,
+    required int cell,
+    required String playerKey6,
+    required int timestampSec,
+  }) {
+    return '$_prefix'
+        'M:${gameId.toLowerCase()}:$cell:${playerKey6.toLowerCase()}:$timestampSec';
+  }
+}
+
+class TicTacToeGameState {
+  final String gameId;
+  final String xPlayerKey6;
+  final String oPlayerKey6;
+  final List<String?> board; // 'X' / 'O' / null
+  final String nextSymbol;
+  final String? winnerSymbol;
+
+  const TicTacToeGameState({
+    required this.gameId,
+    required this.xPlayerKey6,
+    required this.oPlayerKey6,
+    required this.board,
+    required this.nextSymbol,
+    this.winnerSymbol,
+  });
+
+  bool get isDraw =>
+      winnerSymbol == null && board.every((cell) => cell != null);
+  bool get isFinished => winnerSymbol != null || isDraw;
+}
+
+TicTacToeGameState buildTicTacToeState({
+  required String gameId,
+  required String xPlayerKey6,
+  required String oPlayerKey6,
+  required List<TicTacToeEvent> events,
+}) {
+  final board = List<String?>.filled(9, null);
+  var next = 'X';
+  String? winner;
+
+  final sorted = [...events]
+    ..sort((a, b) => a.timestampSec.compareTo(b.timestampSec));
+
+  for (final event in sorted) {
+    if (event.type != TicTacToeEventType.move) continue;
+    if (winner != null) break;
+
+    final expectedKey = next == 'X' ? xPlayerKey6 : oPlayerKey6;
+    final cell = event.cell;
+    if (cell == null) continue;
+    if (event.playerKey6 != expectedKey) continue;
+    if (board[cell] != null) continue;
+
+    board[cell] = next;
+    winner = _computeWinner(board);
+    next = next == 'X' ? 'O' : 'X';
+  }
+
+  return TicTacToeGameState(
+    gameId: gameId,
+    xPlayerKey6: xPlayerKey6,
+    oPlayerKey6: oPlayerKey6,
+    board: board,
+    nextSymbol: next,
+    winnerSymbol: winner,
+  );
+}
+
+String? _computeWinner(List<String?> board) {
+  const lines = <List<int>>[
+    [0, 1, 2],
+    [3, 4, 5],
+    [6, 7, 8],
+    [0, 3, 6],
+    [1, 4, 7],
+    [2, 5, 8],
+    [0, 4, 8],
+    [2, 4, 6],
+  ];
+  for (final line in lines) {
+    final a = board[line[0]];
+    if (a == null) continue;
+    if (a == board[line[1]] && a == board[line[2]]) return a;
+  }
+  return null;
+}

lib/utils/transmission_target_resolver.dart

@@ -0,0 +1,157 @@
+import 'dart:typed_data';
+
+import '../models/contact.dart';
+import '../providers/contacts_provider.dart';
+
+enum TransmissionTargetFailure { unknownContact, unknownRoute, tooFar }
+
+class TransmissionTargetResolution {
+  final Contact? target;
+  final TransmissionTargetFailure? failure;
+  final int maxHops;
+
+  const TransmissionTargetResolution({
+    required this.target,
+    required this.failure,
+    required this.maxHops,
+  });
+
+  int get hops => target?.outPathLen ?? -1;
+  bool get isValid => target != null && failure == null;
+}
+
+class TransmissionTargetResolver {
+  const TransmissionTargetResolver._();
+
+  static Contact? resolveLocalTarget({
+    required ContactsProvider contactsProvider,
+    required bool isSentByMe,
+    Uint8List? recipientPublicKey,
+    Uint8List? senderPublicKeyPrefix,
+    String? senderKey6FromEnvelope,
+    String? senderName,
+  }) {
+    if (isSentByMe) {
+      final recipient = _findByRecipientKey(contactsProvider, recipientPublicKey);
+      if (recipient != null) return recipient;
+    }
+
+    final byEnvelope = _findByEnvelopeKey6(contactsProvider, senderKey6FromEnvelope);
+    if (byEnvelope != null) return byEnvelope;
+
+    final byPrefix = _findByPrefix(contactsProvider, senderPublicKeyPrefix);
+    if (byPrefix != null) return byPrefix;
+
+    return _findByName(contactsProvider, senderName);
+  }
+
+  static Future<TransmissionTargetResolution> resolveFetchTarget({
+    required ContactsProvider contactsProvider,
+    required Future<void> Function() refreshContacts,
+    required bool isSentByMe,
+    Uint8List? recipientPublicKey,
+    Uint8List? senderPublicKeyPrefix,
+    String? senderKey6FromEnvelope,
+    String? senderName,
+    required int maxFetchHops,
+  }) async {
+    var target = resolveLocalTarget(
+      contactsProvider: contactsProvider,
+      isSentByMe: isSentByMe,
+      recipientPublicKey: recipientPublicKey,
+      senderPublicKeyPrefix: senderPublicKeyPrefix,
+      senderKey6FromEnvelope: senderKey6FromEnvelope,
+      senderName: senderName,
+    );
+
+    if (target == null || target.outPathLen < 0 || target.outPathLen > maxFetchHops) {
+      await refreshContacts();
+      target = resolveLocalTarget(
+        contactsProvider: contactsProvider,
+        isSentByMe: isSentByMe,
+        recipientPublicKey: recipientPublicKey,
+        senderPublicKeyPrefix: senderPublicKeyPrefix,
+        senderKey6FromEnvelope: senderKey6FromEnvelope,
+        senderName: senderName,
+      );
+    }
+
+    if (target == null) {
+      return TransmissionTargetResolution(
+        target: null,
+        failure: TransmissionTargetFailure.unknownContact,
+        maxHops: maxFetchHops,
+      );
+    }
+    if (target.outPathLen < 0) {
+      return TransmissionTargetResolution(
+        target: target,
+        failure: TransmissionTargetFailure.unknownRoute,
+        maxHops: maxFetchHops,
+      );
+    }
+    if (target.outPathLen > maxFetchHops) {
+      return TransmissionTargetResolution(
+        target: target,
+        failure: TransmissionTargetFailure.tooFar,
+        maxHops: maxFetchHops,
+      );
+    }
+    return TransmissionTargetResolution(
+      target: target,
+      failure: null,
+      maxHops: maxFetchHops,
+    );
+  }
+
+  static Contact? _findByRecipientKey(
+    ContactsProvider contactsProvider,
+    Uint8List? recipientKey,
+  ) {
+    if (recipientKey == null || recipientKey.isEmpty) return null;
+    final byKey = contactsProvider.findContactByKey(recipientKey);
+    if (byKey != null) return byKey;
+    if (recipientKey.length >= 6) {
+      return contactsProvider.findContactByPrefix(
+        Uint8List.fromList(recipientKey.sublist(0, 6)),
+      );
+    }
+    return null;
+  }
+
+  static Contact? _findByEnvelopeKey6(
+    ContactsProvider contactsProvider,
+    String? senderKey6FromEnvelope,
+  ) {
+    if (senderKey6FromEnvelope == null || senderKey6FromEnvelope.isEmpty) {
+      return null;
+    }
+    return contactsProvider.findContactByPrefixHex(senderKey6FromEnvelope);
+  }
+
+  static Contact? _findByPrefix(
+    ContactsProvider contactsProvider,
+    Uint8List? senderPublicKeyPrefix,
+  ) {
+    if (senderPublicKeyPrefix == null || senderPublicKeyPrefix.length < 6) {
+      return null;
+    }
+    return contactsProvider.findContactByPrefix(
+      Uint8List.fromList(senderPublicKeyPrefix.sublist(0, 6)),
+    );
+  }
+
+  static Contact? _findByName(
+    ContactsProvider contactsProvider,
+    String? senderName,
+  ) {
+    final normalized = senderName?.trim();
+    if (normalized == null || normalized.isEmpty) return null;
+    for (final contact in contactsProvider.contacts) {
+      if (contact.advName.trim().toLowerCase() == normalized.toLowerCase()) {
+        return contact;
+      }
+    }
+    return null;
+  }
+}

lib/utils/voice_message_parser.dart

@@ -181,11 +181,11 @@ class VoicePacket {
 /// Lightweight public/direct message envelope advertising voice availability.
 ///
 /// Text format:
-///   VE1:{sid}:{mode}:{total}:{durMs}:{senderKey6}:{ts}:{ver}
+///   VE2:{sid}:{mode}:{total}:{durS}:{senderKey6}:{ts}
 /// Example:
-///   VE1:00112233:1:4:3200:aabbccddeeff:1234567890:1
+///   VE2:00112233:1:4:4:aabbccddeeff:kf12oi
 class VoiceEnvelope {
-  static const String _prefix = 'VE1:';
+  static const String _prefix = 'VE2:';
 
   final String sessionId;
   final VoicePacketMode mode;
@@ -202,7 +202,7 @@ class VoiceEnvelope {
     required this.durationMs,
     required this.senderKey6,
     required this.timestampSec,
-    this.version = 1,
+    this.version = 2,
   });
 
   static bool isVoiceEnvelopeText(String text) => text.startsWith(_prefix);
@@ -210,43 +210,41 @@ class VoiceEnvelope {
   static VoiceEnvelope? tryParseText(String text) {
     if (!isVoiceEnvelopeText(text)) return null;
     final body = text.substring(_prefix.length);
-    return _tryParseCompact(body);
+    return _tryParse(body);
   }
 
-  static VoiceEnvelope? _tryParseCompact(String body) {
+  static VoiceEnvelope? _tryParse(String body) {
     final parts = body.split(':');
-    if (parts.length != 7) return null;
+    if (parts.length != 6) return null;
     try {
-      final sid = parts[0];
+      final sid = _decodeSessionId(parts[0]);
-      final mode = int.tryParse(parts[1]);
+      final mode = _parseInt(parts[1], base36: true);
-      final total = int.tryParse(parts[2]);
+      final total = _parseInt(parts[2], base36: true);
-      final durMs = int.tryParse(parts[3]);
+      final durS = _parseInt(parts[3], base36: true);
       final senderKey6 = parts[4];
-      final ts = int.tryParse(parts[5]);
+      final ts = _parseInt(parts[5], base36: true);
-      final ver = int.tryParse(parts[6]);
 
-      if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sid)) {
+      if (sid == null) {
         return null;
       }
       if (mode == null || mode < 0 || mode >= VoicePacketMode.values.length) {
         return null;
       }
       if (total == null || total < 1 || total > 255) return null;
-      if (durMs == null || durMs < 0 || durMs > 10 * 60 * 1000) return null;
+      if (durS == null || durS < 0 || durS > 10 * 60) return null;
       if (!RegExp(r'^[0-9a-fA-F]{12}$').hasMatch(senderKey6)) {
         return null;
       }
       if (ts == null || ts <= 0) return null;
-      if (ver == null || ver != 1) return null;
 
       return VoiceEnvelope(
-        sessionId: sid.toLowerCase(),
+        sessionId: sid,
         mode: VoicePacketMode.fromId(mode),
         total: total,
-        durationMs: durMs,
+        durationMs: durS * 1000,
         senderKey6: senderKey6.toLowerCase(),
         timestampSec: ts,
-        version: ver,
+        version: 2,
       );
     } catch (_) {
       return null;
@@ -254,7 +252,8 @@ class VoiceEnvelope {
   }
 
   String encodeText() {
-    return '$_prefix${sessionId.toLowerCase()}:${mode.id}:$total:$durationMs:${senderKey6.toLowerCase()}:$timestampSec:$version';
+    final durationSec = (durationMs / 1000).ceil().clamp(0, 10 * 60);
+    return '$_prefix${_encodeSessionId(sessionId)}:${_toBase36(mode.id)}:${_toBase36(total)}:${_toBase36(durationSec)}:${senderKey6.toLowerCase()}:${_toBase36(timestampSec)}';
   }
 }
 
@@ -415,11 +414,12 @@ int _resolveBandwidthHz(int? rawBw) {
 /// Direct control-plane request to fetch voice packets for a session.
 ///
 /// Text format:
-///   VR1:{sid}:{want}:{requesterKey6}:{ts}:{ver}
+///   VR2:{sid}:{want}:{requesterKey6}:{ts}
 /// Example:
-///   VR1:00112233:a:aabbccddeeff:1234567890:1
+///   VR2:00112233:a:aabbccddeeff:kf12oi
 class VoiceFetchRequest {
-  static const String _prefix = 'VR1:';
+  static const String _prefix = 'VR2:';
+  static const int _binaryMagic = 0x72; // 'r'
 
   final String sessionId;
   final String want;
@@ -434,42 +434,82 @@ class VoiceFetchRequest {
     this.missingIndices = const [],
     required this.requesterKey6,
     required this.timestampSec,
-    this.version = 1,
+    this.version = 2,
   });
 
-  static bool isVoiceFetchRequestText(String text) => text.startsWith(_prefix);
+  static bool isVoiceFetchRequestText(String text) =>
+      text.startsWith(_prefix);
+  static bool isVoiceFetchRequestBinary(Uint8List payload) =>
+      payload.isNotEmpty && payload[0] == _binaryMagic;
 
   static VoiceFetchRequest? tryParseText(String text) {
     if (!isVoiceFetchRequestText(text)) return null;
     final body = text.substring(_prefix.length);
-    return _tryParseCompact(body);
+    return _tryParse(body);
   }
 
-  static VoiceFetchRequest? _tryParseCompact(String body) {
+  static VoiceFetchRequest? tryParseBinary(Uint8List payload) {
-    final parts = body.split(':');
+    if (!isVoiceFetchRequestBinary(payload)) return null;
-    if (parts.length != 5) return null;
+    if (payload.length < 17) return null; // magic+sid+flags+key6+ts+count
     try {
-      final sid = parts[0];
+      final sidBytes = payload.sublist(1, 5);
+      final sid = sidBytes
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .join()
+          .toLowerCase();
+      final flags = payload[5];
+      final requesterKey6 = payload
+          .sublist(6, 12)
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .join()
+          .toLowerCase();
+      final ts =
+          (payload[12] << 24) |
+          (payload[13] << 16) |
+          (payload[14] << 8) |
+          payload[15];
+      final missingCount = payload[16];
+      if (payload.length != 17 + missingCount) return null;
+      final wantMissing = (flags & 0x01) == 0x01;
+      final missing = <int>[];
+      for (var i = 0; i < missingCount; i++) {
+        missing.add(payload[17 + i]);
+      }
+      return VoiceFetchRequest(
+        sessionId: sid,
+        want: wantMissing ? 'missing' : 'all',
+        missingIndices: missing,
+        requesterKey6: requesterKey6,
+        timestampSec: ts,
+        version: 2,
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  static VoiceFetchRequest? _tryParse(String body) {
+    final parts = body.split(':');
+    if (parts.length != 4) return null;
+    try {
+      final sid = _decodeSessionId(parts[0]);
       final wantToken = parts[1];
       final requesterKey6 = parts[2];
-      final ts = int.tryParse(parts[3]);
+      final ts = _parseInt(parts[3], base36: true);
-      final ver = int.tryParse(parts[4]);
       final normalizedWant = wantToken == 'a'
           ? 'all'
-          : (wantToken.startsWith('m-') ? 'missing' : wantToken);
+          : ((wantToken.startsWith('m'))
+                ? 'missing'
+                : wantToken);
 
-      if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sid)) {
+      if (sid == null) {
         return null;
       }
       final missingIndices = <int>[];
       if (normalizedWant == 'missing') {
-        final encoded = wantToken.substring(2);
+        final encoded = wantToken.substring(1);
         if (encoded.isEmpty) return null;
-        for (final raw in encoded.split(',')) {
+        missingIndices.addAll(_decodeMissingIndicesCompact(encoded));
-          final idx = int.tryParse(raw);
-          if (idx == null || idx < 0 || idx > 254) return null;
-          missingIndices.add(idx);
-        }
         if (missingIndices.isEmpty) return null;
       } else if (normalizedWant != 'all') {
         return null;
@@ -478,15 +518,14 @@ class VoiceFetchRequest {
         return null;
       }
       if (ts == null || ts <= 0) return null;
-      if (ver == null || ver != 1) return null;
 
       return VoiceFetchRequest(
-        sessionId: sid.toLowerCase(),
+        sessionId: sid,
         want: normalizedWant,
         missingIndices: missingIndices,
         requesterKey6: requesterKey6.toLowerCase(),
         timestampSec: ts,
-        version: ver,
+        version: 2,
       );
     } catch (_) {
       return null;
@@ -495,10 +534,168 @@ class VoiceFetchRequest {
 
   String encodeText() {
     final wantToken = want == 'missing' && missingIndices.isNotEmpty
-        ? 'm-${missingIndices.join(',')}'
+        ? 'm${_encodeMissingIndicesCompact(missingIndices)}'
         : (want == 'all' ? 'a' : want);
-    return '$_prefix${sessionId.toLowerCase()}:$wantToken:${requesterKey6.toLowerCase()}:$timestampSec:$version';
+    return '$_prefix${_encodeSessionId(sessionId)}:$wantToken:${requesterKey6.toLowerCase()}:${_toBase36(timestampSec)}';
   }
+
+  Uint8List encodeBinary() {
+    if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sessionId)) {
+      throw ArgumentError.value(sessionId, 'sessionId', 'Expected 8 hex chars');
+    }
+    if (!RegExp(r'^[0-9a-fA-F]{12}$').hasMatch(requesterKey6)) {
+      throw ArgumentError.value(
+        requesterKey6,
+        'requesterKey6',
+        'Expected 12 hex chars',
+      );
+    }
+    final useMissing = want == 'missing' && missingIndices.isNotEmpty;
+    final missing = useMissing
+        ? missingIndices.where((v) => v >= 0 && v <= 254).toList()
+        : <int>[];
+
+    final out = Uint8List(17 + missing.length);
+    out[0] = _binaryMagic;
+    for (var i = 0; i < 4; i++) {
+      out[1 + i] = int.parse(sessionId.substring(i * 2, i * 2 + 2), radix: 16);
+    }
+    out[5] = useMissing ? 0x01 : 0x00;
+    for (var i = 0; i < 6; i++) {
+      out[6 + i] = int.parse(
+        requesterKey6.substring(i * 2, i * 2 + 2),
+        radix: 16,
+      );
+    }
+    out[12] = (timestampSec >> 24) & 0xFF;
+    out[13] = (timestampSec >> 16) & 0xFF;
+    out[14] = (timestampSec >> 8) & 0xFF;
+    out[15] = timestampSec & 0xFF;
+    out[16] = missing.length;
+    for (var i = 0; i < missing.length; i++) {
+      out[17 + i] = missing[i];
+    }
+    return out;
+  }
+}
+
+/// Per-fragment ACK for raw voice payload packets.
+///
+/// Binary format:
+///   [0x76 'v'][sessionId:4B][index:1B]
+class VoiceFragmentAck {
+  static const int _binaryMagic = 0x76; // 'v'
+
+  final String sessionId; // 8 hex chars
+  final int index; // 0..254
+
+  const VoiceFragmentAck({required this.sessionId, required this.index});
+
+  static bool isVoiceFragmentAckBinary(Uint8List payload) =>
+      payload.length == 6 && payload[0] == _binaryMagic;
+
+  static VoiceFragmentAck? tryParseBinary(Uint8List payload) {
+    if (!isVoiceFragmentAckBinary(payload)) return null;
+    try {
+      final sid = payload
+          .sublist(1, 5)
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .join()
+          .toLowerCase();
+      final idx = payload[5];
+      return VoiceFragmentAck(sessionId: sid, index: idx);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Uint8List encodeBinary() {
+    if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sessionId)) {
+      throw ArgumentError.value(sessionId, 'sessionId', 'Expected 8 hex chars');
+    }
+    if (index < 0 || index > 254) {
+      throw ArgumentError.value(index, 'index', 'Expected 0..254');
+    }
+    final out = Uint8List(6);
+    out[0] = _binaryMagic;
+    for (var i = 0; i < 4; i++) {
+      out[1 + i] = int.parse(sessionId.substring(i * 2, i * 2 + 2), radix: 16);
+    }
+    out[5] = index;
+    return out;
+  }
+}
+
+int? _parseInt(String token, {required bool base36}) =>
+    int.tryParse(token, radix: base36 ? 36 : 10);
+
+String _toBase36(int value) => value.toRadixString(36);
+
+String _encodeSessionId(String sessionIdHex) {
+  if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sessionIdHex)) {
+    throw ArgumentError.value(sessionIdHex, 'sessionIdHex', 'Expected 8 hex chars');
+  }
+  final value = int.parse(sessionIdHex, radix: 16);
+  return value.toRadixString(36);
+}
+
+String? _decodeSessionId(String token) {
+  if (!RegExp(r'^[0-9a-z]{1,7}$').hasMatch(token)) return null;
+  final value = int.tryParse(token, radix: 36);
+  if (value == null || value < 0 || value > 0xFFFFFFFF) return null;
+  return value.toRadixString(16).padLeft(8, '0');
+}
+
+String _encodeMissingIndicesCompact(List<int> indices) {
+  final sorted = indices
+      .where((v) => v >= 0 && v <= 254)
+      .toSet()
+      .toList()
+    ..sort();
+  if (sorted.isEmpty) return '';
+  final chunks = <String>[];
+  var start = sorted.first;
+  var prev = sorted.first;
+  for (var i = 1; i < sorted.length; i++) {
+    final curr = sorted[i];
+    if (curr == prev + 1) {
+      prev = curr;
+      continue;
+    }
+    chunks.add(
+      start == prev ? _toBase36(start) : '${_toBase36(start)}-${_toBase36(prev)}',
+    );
+    start = curr;
+    prev = curr;
+  }
+  chunks.add(
+    start == prev ? _toBase36(start) : '${_toBase36(start)}-${_toBase36(prev)}',
+  );
+  return chunks.join('.');
+}
+
+List<int> _decodeMissingIndicesCompact(String encoded) {
+  final out = <int>[];
+  for (final token in encoded.split('.')) {
+    if (token.isEmpty) continue;
+    if (!token.contains('-')) {
+      final value = int.tryParse(token, radix: 36);
+      if (value == null || value < 0 || value > 254) return const [];
+      out.add(value);
+      continue;
+    }
+    final parts = token.split('-');
+    if (parts.length != 2) return const [];
+    final start = int.tryParse(parts[0], radix: 36);
+    final end = int.tryParse(parts[1], radix: 36);
+    if (start == null || end == null || start < 0 || end > 254 || start > end) {
+      return const [];
+    }
+    for (var i = start; i <= end; i++) {
+      out.add(i);
+    }
+  }
+  return out;
 }
 
 /// Builds a compact visual waveform from real voice packet bytes.

lib/widgets/connection_dialog.dart

@@ -16,6 +16,7 @@ class ConnectionDialog extends StatefulWidget {
 class _ConnectionDialogState extends State<ConnectionDialog>
     with SingleTickerProviderStateMixin {
   late TabController _tabController;
+  late final ConnectionProvider _connectionProvider;
   final NetworkScannerService _networkScanner = NetworkScannerService();
   final List<DiscoveredServer> _discoveredServers = [];
   int _scannedCount = 0;
@@ -46,13 +47,14 @@ class _ConnectionDialogState extends State<ConnectionDialog>
   void initState() {
     super.initState();
     _tabController = TabController(length: 2, vsync: this);
+    _connectionProvider = Provider.of<ConnectionProvider>(context, listen: false);
 
-    // Start BLE scan by default
+    // Defer scan startup until after the first frame so Provider listeners
-    final connectionProvider = Provider.of<ConnectionProvider>(
+    // are not notified while this dialog is still being built.
-      context,
+    WidgetsBinding.instance.addPostFrameCallback((_) {
-      listen: false,
+      if (!mounted) return;
-    );
+      _connectionProvider.startScan();
-    connectionProvider.startScan();
+    });
 
     // Set up network scanner callbacks
     _networkScanner.onServerDiscovered = (server) {
@@ -81,11 +83,7 @@ class _ConnectionDialogState extends State<ConnectionDialog>
 
   @override
   void dispose() {
-    final connectionProvider = Provider.of<ConnectionProvider>(
+    _connectionProvider.stopScan();
-      context,
-      listen: false,
-    );
-    connectionProvider.stopScan();
     _networkScanner.stopScan();
     // Remove listener before disposing to prevent memory leaks
     _tabController.removeListener(_onTabChanged);

lib/widgets/messages/image_message_bubble.dart

@@ -3,18 +3,18 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter_avif/flutter_avif.dart';
 import 'package:provider/provider.dart';
-import '../../models/contact.dart';
 import '../../models/message.dart';
 import '../../providers/connection_provider.dart';
 import '../../providers/contacts_provider.dart';
 import '../../providers/image_provider.dart' as ip;
 import '../../utils/image_message_parser.dart';
+import '../../utils/transmission_target_resolver.dart';
 import 'transfer_timeout.dart';
 
 /// A message bubble that shows a received or sent image.
 ///
-/// On first render the image is not yet fetched (only the IE1 envelope is
+/// On first render the image is not yet fetched (only the IE2 envelope is
-/// known).  The user taps the thumbnail placeholder → IR1 fetch request is
+/// known).  The user taps the thumbnail placeholder → IR2 fetch request is
 /// sent → binary fragments stream in → bubble rebuilds with the full image.
 class ImageMessageBubble extends StatefulWidget {
   final Message message;
@@ -58,12 +58,32 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
 
     return Consumer<ip.ImageProvider>(
       builder: (context, imageProvider, _) {
+        final contactsProvider = context.read<ContactsProvider>();
         final session = imageProvider.session(envelope.sessionId);
+        final sender = TransmissionTargetResolver.resolveLocalTarget(
+          contactsProvider: contactsProvider,
+          isSentByMe: widget.isSentByMe,
+          recipientPublicKey: widget.message.recipientPublicKey,
+          senderPublicKeyPrefix: widget.message.senderPublicKeyPrefix,
+          senderKey6FromEnvelope: envelope.senderKey6,
+          senderName: widget.message.senderName,
+        );
+        final effectivePathLen = sender != null && sender.outPathLen >= 0
+            ? sender.outPathLen
+            : widget.message.pathLen;
         final isComplete = imageProvider.isComplete(envelope.sessionId);
+        final eta = imageProvider.estimateRemainingTransferTime(
+          envelope.sessionId,
+        );
 
         if (_isRequesting && isComplete) {
           WidgetsBinding.instance.addPostFrameCallback((_) {
-            if (mounted) setState(() => _isRequesting = false);
+            if (mounted) {
+              setState(() {
+                _isRequesting = false;
+                _errorText = null;
+              });
+            }
           });
         }
 
@@ -95,6 +115,7 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
                     radioBw: radioBw,
                     radioSf: radioSf,
                     radioCr: radioCr,
+                    pathLen: effectivePathLen,
                   ),
                 ),
                 const SizedBox(height: 4),
@@ -106,12 +127,13 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
                     received: received,
                     total: total,
                     envelope: envelope,
-                    pathLen: widget.message.pathLen,
                     radioBw: radioBw,
                     radioSf: radioSf,
                     radioCr: radioCr,
                     error: _errorText,
                     isSentByMe: widget.isSentByMe,
+                    eta: eta,
+                    pathLen: effectivePathLen,
                   ),
                   style: TextStyle(
                     fontSize: 11,
@@ -139,6 +161,7 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
     required int? radioBw,
     required int? radioSf,
     required int? radioCr,
+    required int pathLen,
   }) {
     if (isComplete && imageBytes != null) {
       return AspectRatio(
@@ -170,8 +193,38 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
                 '$received/$total',
                 style: const TextStyle(color: Colors.white, fontSize: 11),
               ),
+              Positioned(
+                top: 8,
+                right: 8,
+                child: IconButton(
+                  onPressed: () => _cancelReceive(envelope.sessionId),
+                  icon: const Icon(Icons.close, size: 20),
+                  color: Colors.white70,
+                  tooltip: 'Cancel image receive',
+                ),
+              ),
             ] else if (_errorText != null) ...[
+              Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
                   const Icon(Icons.broken_image, color: Colors.red, size: 36),
+                  const SizedBox(height: 8),
+                  TextButton.icon(
+                    onPressed: () => _requestAndFetch(
+                      envelope,
+                      radioBw: radioBw,
+                      radioSf: radioSf,
+                      radioCr: radioCr,
+                      pathLen: pathLen,
+                    ),
+                    icon: const Icon(Icons.refresh, size: 18),
+                    label: const Text('Retry'),
+                    style: TextButton.styleFrom(
+                      foregroundColor: Colors.white70,
+                    ),
+                  ),
+                ],
+              ),
             ] else ...[
               // Tap-to-load icon.
               IconButton(
@@ -180,7 +233,7 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
                   radioBw: radioBw,
                   radioSf: radioSf,
                   radioCr: radioCr,
-                  pathLen: widget.message.pathLen,
+                  pathLen: pathLen,
                 ),
                 icon: const Icon(Icons.download_rounded, size: 40),
                 color: Colors.white70,
@@ -201,34 +254,45 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
     int pathLen = 0,
   }) async {
     if (_isRequesting) return;
-    var sender = _resolveSender(envelope);
-    if (sender == null) {
     final conn = context.read<ConnectionProvider>();
-      await conn.getContacts();
+    final imageProvider = context.read<ip.ImageProvider>();
+    imageProvider.resumeIncomingSession(envelope.sessionId);
+    final contactsProvider = context.read<ContactsProvider>();
+    final resolution = await TransmissionTargetResolver.resolveFetchTarget(
+      contactsProvider: contactsProvider,
+      refreshContacts: conn.getContacts,
+      isSentByMe: widget.isSentByMe,
+      recipientPublicKey: widget.message.recipientPublicKey,
+      senderPublicKeyPrefix: widget.message.senderPublicKeyPrefix,
+      senderKey6FromEnvelope: envelope.senderKey6,
+      senderName: widget.message.senderName,
+      maxFetchHops: _maxFetchHops,
+    );
     if (!mounted) return;
-      sender = _resolveSender(envelope);
+
-    }
+    if (resolution.failure == TransmissionTargetFailure.unknownContact) {
-    if (sender == null) {
       await _showBlockingAlert(
         'Cannot fetch image',
         'Sender contact is unknown. Sync contacts first.',
       );
       return;
     }
-    if (sender.outPathLen < 0) {
+    if (resolution.failure == TransmissionTargetFailure.unknownRoute) {
       await _showBlockingAlert(
         'Cannot fetch image',
         'Sender route is unknown. Sync contacts/path first.',
       );
       return;
     }
-    if (sender.outPathLen > _maxFetchHops) {
+    if (resolution.failure == TransmissionTargetFailure.tooFar) {
       await _showBlockingAlert(
         'Cannot fetch image',
-        'Message is too far (${sender.outPathLen} hops, max $_maxFetchHops).',
+        'Message is too far (${resolution.hops} hops, max ${resolution.maxHops}).',
       );
       return;
     }
+
+    final sender = resolution.target!;
     if (sender.outPathLen >= 2) {
       _showToast(
         'Image fetch over ${sender.outPathLen} hops may take a while.',
@@ -236,8 +300,6 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
     }
 
     setState(() => _errorText = null);
-    final conn = context.read<ConnectionProvider>();
-    final imageProvider = context.read<ip.ImageProvider>();
     final deviceKey = conn.deviceInfo.publicKey;
     if (deviceKey == null || deviceKey.length < 6) {
       await _showBlockingAlert(
@@ -275,26 +337,35 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
       _errorText = null;
     });
 
-    final sent = await conn.sendTextMessage(
+    final payload = request.encodeBinary();
-      contactPublicKey: sender.publicKey,
+    try {
-      text: request.encode(),
+      await conn.sendRawVoicePacket(
-      contact: sender,
+        contactPath: sender.outPath,
+        contactPathLen: sender.outPathLen,
+        payload: payload,
       );
-    if (!sent && mounted) {
+    } catch (_) {
+      if (mounted) {
+        _showToast('Image fetch failed to send request');
         setState(() {
           _isRequesting = false;
           _errorText = 'Image unavailable right now';
         });
+      }
       return;
     }
+    if (!mounted) return;
 
     // Timeout = 2× estimated LoRa airtime (min 30s).
+    final effectivePathLen = sender.outPathLen >= 0
+        ? sender.outPathLen
+        : pathLen;
     final txEstimate = estimateImageTransmitDuration(
       fragmentCount: missing.isEmpty ? envelope.total : missing.length,
       sizeBytes: missing.isEmpty
           ? envelope.sizeBytes
           : (envelope.sizeBytes * missing.length / envelope.total).round(),
-      pathLen: pathLen,
+      pathLen: effectivePathLen,
       radioBw: radioBw,
       radioSf: radioSf,
       radioCr: radioCr,
@@ -306,38 +377,16 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
         if (mounted &&
             _isRequesting &&
             !imageProvider.isComplete(envelope.sessionId)) {
-          setState(() => _isRequesting = false);
+          _showToast('Image fetch timed out');
+          setState(() {
+            _isRequesting = false;
+            _errorText = 'Image fetch timed out';
+          });
         }
       },
     );
   }
 
-  Contact? _resolveSender(ImageEnvelope envelope) {
-    final contactsProvider = context.read<ContactsProvider>();
-    final senderPrefix = widget.message.senderPublicKeyPrefix;
-    if (senderPrefix != null && senderPrefix.length >= 6) {
-      final c = contactsProvider.findContactByPrefix(
-        Uint8List.fromList(senderPrefix.sublist(0, 6)),
-      );
-      if (c != null) return c;
-    }
-    final contact = contactsProvider.findContactByPrefixHex(
-      envelope.senderKey6,
-    );
-    if (contact != null) return contact;
-
-    final senderName = widget.message.senderName?.trim();
-    if (senderName != null && senderName.isNotEmpty) {
-      for (final c in contactsProvider.contacts) {
-        if (c.advName.trim().toLowerCase() == senderName.toLowerCase()) {
-          return c;
-        }
-      }
-    }
-
-    return null;
-  }
-
   void _showToast(String message) {
     if (!mounted) return;
     ScaffoldMessenger.of(context).showSnackBar(
@@ -345,8 +394,20 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
     );
   }
 
+  void _cancelReceive(String sessionId) {
+    if (!mounted) return;
+    _requestTimeoutTimer?.cancel();
+    context.read<ip.ImageProvider>().cancelIncomingSession(sessionId);
+    _showToast('Image receive canceled');
+    setState(() {
+      _isRequesting = false;
+      _errorText = 'Image receive canceled';
+    });
+  }
+
   Future<void> _showBlockingAlert(String title, String message) async {
     if (!mounted) return;
+    _showToast('$title: $message');
     await showDialog<void>(
       context: context,
       builder: (dialogContext) => AlertDialog(
@@ -374,6 +435,7 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
     required int? radioCr,
     required String? error,
     required bool isSentByMe,
+    required Duration? eta,
   }) {
     final txEstimate = estimateImageTransmitDuration(
       fragmentCount: envelope.total,
@@ -386,7 +448,10 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
     final txEstimateLabel = _formatTransmitEstimate(txEstimate);
 
     if (error != null) return error;
-    if (isRequesting) return '📥 Loading… $received/$total · $txEstimateLabel';
+    if (isRequesting) {
+      final etaLabel = _formatEta(eta);
+      return '📥 Loading… $received/$total · $etaLabel · $txEstimateLabel';
+    }
     if (isComplete) {
       final base =
           '🖼️ ${envelope.width}×${envelope.height} ${envelope.format.label}';
@@ -404,6 +469,14 @@ class _ImageMessageBubbleState extends State<ImageMessageBubble> {
     return '~${minutes}m ${seconds}s tx';
   }
 
+  static String _formatEta(Duration? eta) {
+    if (eta == null || eta <= Duration.zero) return 'ETA --';
+    if (eta.inSeconds < 60) return 'ETA ~${eta.inSeconds}s';
+    final minutes = eta.inMinutes;
+    final seconds = eta.inSeconds % 60;
+    return 'ETA ~${minutes}m ${seconds}s';
+  }
+
   void _showFullScreen(BuildContext context, Uint8List imageBytes) {
     showGeneralDialog<void>(
       context: context,

lib/widgets/messages/message_bubble.dart

@@ -22,10 +22,12 @@ import '../../utils/sar_message_parser.dart';
 import '../../utils/key_comparison.dart';
 import '../../utils/voice_message_parser.dart';
 import '../../utils/image_message_parser.dart';
+import '../../utils/tictactoe_message_parser.dart';
 import '../../l10n/app_localizations.dart';
 import '../../utils/message_extensions.dart';
 import 'voice_message_bubble.dart';
 import 'image_message_bubble.dart';
+import 'tictactoe_message_bubble.dart';
 import 'message_trace_sheet.dart';
 
 /// Reusable message bubble widget that displays messages with various types:
@@ -466,7 +468,7 @@ class _MessageBubbleState extends State<MessageBubble> {
       'Sent message: ${widget.message.isSentMessage}',
       'Read: ${widget.message.isRead}',
       'Status: ${widget.message.deliveryStatus.name}',
-      'Path length (nodes/hops): ${widget.message.pathLen}',
+      'Path length (nodes/hops): ${_hopDebugLabel(widget.message)}',
       'Sender timestamp: ${widget.message.senderTimestamp} (${widget.message.sentAt.toIso8601String()})',
       'Received at (RFC3339): ${_formatRfc3339(widget.message.receivedAt)}',
       'Channel index: ${widget.message.channelIdx ?? '-'}',
@@ -633,8 +635,7 @@ class _MessageBubbleState extends State<MessageBubble> {
                           _techBadge(
                             context,
                             icon: Icons.route,
-                            label:
+                            label: _hopDisplayLabel(widget.message),
-                                '${widget.message.pathLen} hop${widget.message.pathLen == 1 ? '' : 's'}',
                           ),
                           _techBadge(
                             context,
@@ -1525,9 +1526,7 @@ class _MessageBubbleState extends State<MessageBubble> {
     required int? rssiDbm,
     required double? snrDb,
   }) {
-    final hopLabel = message.pathLen == 0
+    final hopLabel = _hopDisplayLabel(message);
-        ? 'Direct'
-        : '${message.pathLen} hop${message.pathLen == 1 ? '' : 's'}';
 
     return Wrap(
       spacing: 4,
@@ -1568,6 +1567,21 @@ class _MessageBubbleState extends State<MessageBubble> {
     );
   }
 
+  String _hopDisplayLabel(Message message) {
+    if (message.pathLen == 0) return 'Direct';
+    if (message.pathLen >= 255 && message.isContactMessage) return 'Direct';
+    if (message.pathLen >= 255) return 'Unknown';
+    return '${message.pathLen} hop${message.pathLen == 1 ? '' : 's'}';
+  }
+
+  String _hopDebugLabel(Message message) {
+    if (message.pathLen >= 255 && message.isContactMessage) {
+      return 'Direct (raw: ${message.pathLen})';
+    }
+    if (message.pathLen >= 255) return 'Unknown (raw: ${message.pathLen})';
+    return _hopDisplayLabel(message);
+  }
+
   Widget _techChip(
     BuildContext context, {
     required IconData icon,
@@ -1680,6 +1694,13 @@ class _MessageBubbleState extends State<MessageBubble> {
     }
 
     final message = widget.message;
+    final ticTacToeEvent = message.isContactMessage
+        ? TicTacToeMessageParser.tryParse(message.text)
+        : null;
+    if (ticTacToeEvent?.type == TicTacToeEventType.move) {
+      // Hide move control packets from chat; the game bubble updates itself.
+      return const SizedBox.shrink();
+    }
     final isSarMarker = message.isSarMarker;
     final isDarkMode = Theme.of(context).brightness == Brightness.dark;
 
@@ -1727,9 +1748,10 @@ class _MessageBubbleState extends State<MessageBubble> {
         : message.getRichDisplayName(senderContact);
     final l10n = AppLocalizations.of(context)!;
 
-    // For sent direct/channel messages, look up destination display label
+    // Look up destination/source display labels for direct/channel messages
     dynamic recipientContact;
     String? recipientDisplayName;
+    String? channelDisplayName;
     if (isOwnMessage &&
         message.isContactMessage &&
         message.recipientPublicKey != null) {
@@ -1757,30 +1779,47 @@ class _MessageBubbleState extends State<MessageBubble> {
               recipientContact.displayName ?? recipientContact.advName;
         }
       }
-    } else if (isOwnMessage && message.isChannelMessage) {
+    } else if (message.isChannelMessage) {
       if (message.channelIdx == 0) {
-        recipientDisplayName = l10n.publicChannel;
+        channelDisplayName = l10n.publicChannel;
       } else {
         final channelContact = contactsProvider.channels.where((c) {
           return c.publicKey.length > 1 && c.publicKey[1] == message.channelIdx;
         }).firstOrNull;
-        recipientDisplayName =
+        channelDisplayName =
             channelContact?.getLocalizedDisplayName(context) ??
             '${l10n.channel} ${message.channelIdx}';
       }
+
+      if (isOwnMessage) {
+        recipientDisplayName = channelDisplayName;
+      }
     }
 
     final recipientSubtitle =
         isOwnMessage && message.isChannelMessage && recipientDisplayName != null
         ? '${l10n.channel}: $recipientDisplayName'
         : recipientDisplayName;
+    final receivedChannelSubtitle =
+        !isOwnMessage && message.isChannelMessage && channelDisplayName != null
+        ? '${l10n.channel}: $channelDisplayName'
+        : null;
 
-    return GestureDetector(
+    final shouldFloatBubble = message.isChannelMessage || widget.isCompact;
+    final bubble = ConstrainedBox(
+      constraints: BoxConstraints(
+        maxWidth: shouldFloatBubble
+            ? MediaQuery.of(context).size.width * 0.78
+            : double.infinity,
+      ),
+      child: GestureDetector(
           onTap: () => _handleBubbleTap(
             isSarMarker: isSarMarker,
             isDrawing: message.isDrawing,
           ),
-      onLongPress: widget.isCompact ? null : () => _showMessageOptions(context),
+          onLongPress: widget.isCompact
+              ? null
+              : () => _showMessageOptions(context),
           child: Container(
             margin: const EdgeInsets.only(bottom: 8),
             padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
@@ -1844,7 +1883,10 @@ class _MessageBubbleState extends State<MessageBubble> {
                       BoxShadow(
                         color:
                             (isSarMarker
-                                ? _getSarMarkerBorderColor(context, isDarkMode)
+                                    ? _getSarMarkerBorderColor(
+                                        context,
+                                        isDarkMode,
+                                      )
                                     : Theme.of(context).colorScheme.primary)
                                 .withValues(alpha: 0.3),
                         blurRadius: 8,
@@ -1975,15 +2017,17 @@ class _MessageBubbleState extends State<MessageBubble> {
                         maxLines: 1,
                         overflow: TextOverflow.ellipsis,
                       ),
-                      // Show destination for sent direct/channel messages on a separate line
+                      // Show destination/source context on a separate line.
-                      if (isOwnMessage &&
+                      if (!widget.isCompact &&
-                          recipientSubtitle != null &&
+                          (recipientSubtitle != null ||
-                          !widget.isCompact) ...[
+                              receivedChannelSubtitle != null)) ...[
                         const SizedBox(height: 2),
                         Row(
                           children: [
                             Icon(
-                              Icons.arrow_forward,
+                              isOwnMessage
+                                  ? Icons.arrow_forward
+                                  : Icons.arrow_back,
                               size: 12,
                               color: Theme.of(context)
                                   .textTheme
@@ -1994,7 +2038,9 @@ class _MessageBubbleState extends State<MessageBubble> {
                             const SizedBox(width: 4),
                             Expanded(
                               child: Text(
-                                recipientSubtitle,
+                                isOwnMessage
+                                    ? recipientSubtitle!
+                                    : receivedChannelSubtitle!,
                                 style: Theme.of(context).textTheme.labelSmall
                                     ?.copyWith(
                                       color: Theme.of(context)
@@ -2180,6 +2226,10 @@ class _MessageBubbleState extends State<MessageBubble> {
             else if (ImageEnvelope.isEnvelope(message.text) &&
                 !widget.isCompact)
               ImageMessageBubble(message: message, isSentByMe: isOwnMessage)
+            // Tic-Tac-Toe control message content
+            else if (ticTacToeEvent?.type == TicTacToeEventType.start &&
+                !widget.isCompact)
+              TicTacToeMessageBubble(message: message, isSentByMe: isOwnMessage)
             // Regular message content
             else if (!message.isDrawing || widget.isCompact)
               Text(message.text, style: Theme.of(context).textTheme.bodyMedium),
@@ -2449,6 +2499,18 @@ class _MessageBubbleState extends State<MessageBubble> {
           ],
             ),
           ),
+      ),
+    );
+
+    if (!shouldFloatBubble) {
+      return bubble;
+    }
+
+    return Row(
+      mainAxisAlignment: isOwnMessage
+          ? MainAxisAlignment.end
+          : MainAxisAlignment.start,
+      children: [Flexible(child: bubble)],
     );
   }
 }

lib/widgets/messages/tictactoe_message_bubble.dart

@@ -0,0 +1,297 @@
+import 'dart:math' as math;
+import 'dart:typed_data';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import '../../models/contact.dart';
+import '../../models/message.dart';
+import '../../providers/connection_provider.dart';
+import '../../providers/contacts_provider.dart';
+import '../../providers/messages_provider.dart';
+import '../../utils/tictactoe_message_parser.dart';
+import '../../utils/toast_logger.dart';
+
+class TicTacToeMessageBubble extends StatelessWidget {
+  final Message message;
+  final bool isSentByMe;
+
+  const TicTacToeMessageBubble({
+    super.key,
+    required this.message,
+    required this.isSentByMe,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final event = TicTacToeMessageParser.tryParse(message.text);
+    if (event == null) {
+      return const SizedBox.shrink();
+    }
+
+    final conn = context.watch<ConnectionProvider>();
+    final contacts = context.read<ContactsProvider>();
+    final messages = context.watch<MessagesProvider>().messages;
+    final selfKey = conn.deviceInfo.publicKey;
+    if (selfKey == null || selfKey.length < 6) {
+      return const Text('Tic-Tac-Toe unavailable');
+    }
+
+    final selfKey6 = _key6Hex(selfKey);
+    final opponent = _resolveOpponentContact(
+      message: message,
+      contactsProvider: contacts,
+      isSentByMe: isSentByMe,
+    );
+    if (opponent == null) {
+      return const Text('Tic-Tac-Toe: opponent unknown');
+    }
+    final opponentKey6 = _key6Hex(opponent.publicKey);
+
+    final gameEvents = <TicTacToeEvent>[];
+    TicTacToeEvent? start;
+    for (final m in messages) {
+      if (!m.isContactMessage) continue;
+      final parsed = TicTacToeMessageParser.tryParse(m.text);
+      if (parsed == null || parsed.gameId != event.gameId) continue;
+      if (!_isSameDmThread(
+        message: m,
+        selfKey: selfKey,
+        opponentKey6: opponentKey6,
+      )) {
+        continue;
+      }
+      if (parsed.type == TicTacToeEventType.start) {
+        start ??= parsed;
+      } else {
+        gameEvents.add(parsed);
+      }
+    }
+
+    start ??= event.type == TicTacToeEventType.start ? event : null;
+    if (start == null) {
+      return const Text('Tic-Tac-Toe: waiting for start');
+    }
+
+    final xPlayer = start.playerKey6;
+    final oPlayer = xPlayer == selfKey6 ? opponentKey6 : selfKey6;
+    final state = buildTicTacToeState(
+      gameId: event.gameId,
+      xPlayerKey6: xPlayer,
+      oPlayerKey6: oPlayer,
+      events: gameEvents,
+    );
+
+    final mySymbol = selfKey6 == state.xPlayerKey6 ? 'X' : 'O';
+    final isMyTurn = !state.isFinished && state.nextSymbol == mySymbol;
+    final titleColor = isSentByMe
+        ? colorScheme.onPrimaryContainer
+        : colorScheme.onSurface;
+    final statusColor = isSentByMe
+        ? colorScheme.onPrimaryContainer.withValues(alpha: 0.85)
+        : colorScheme.onSurface.withValues(alpha: 0.85);
+
+    return ConstrainedBox(
+      constraints: const BoxConstraints(maxWidth: 230),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(
+            'Tic-Tac-Toe · Game ${state.gameId}',
+            style: Theme.of(
+              context,
+            ).textTheme.labelMedium?.copyWith(
+              fontWeight: FontWeight.bold,
+              color: titleColor,
+            ),
+          ),
+          const SizedBox(height: 8),
+          _BoardGrid(
+            board: state.board,
+            enabled: isMyTurn,
+            isSentByMe: isSentByMe,
+            onTapCell: (idx) => _onCellTap(
+              context: context,
+              idx: idx,
+              state: state,
+              selfKey6: selfKey6,
+              opponent: opponent,
+              connectionProvider: conn,
+            ),
+          ),
+          const SizedBox(height: 8),
+          Text(
+            _statusText(state: state, mySymbol: mySymbol),
+            style: Theme.of(
+              context,
+            ).textTheme.labelSmall?.copyWith(color: statusColor),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Future<void> _onCellTap({
+    required BuildContext context,
+    required int idx,
+    required TicTacToeGameState state,
+    required String selfKey6,
+    required Contact opponent,
+    required ConnectionProvider connectionProvider,
+  }) async {
+    if (idx < 0 || idx > 8 || state.board[idx] != null) return;
+    if (!connectionProvider.deviceInfo.isConnected) {
+      ToastLogger.error(context, 'Not connected to device');
+      return;
+    }
+
+    final messagesProvider = context.read<MessagesProvider>();
+    final text = TicTacToeMessageParser.encodeMove(
+      gameId: state.gameId,
+      cell: idx,
+      playerKey6: selfKey6,
+      timestampSec: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+    );
+    final messageId = '${DateTime.now().millisecondsSinceEpoch}_ttt_move';
+    final senderPublicKeyPrefix = connectionProvider.deviceInfo.publicKey!
+        .sublist(0, 6);
+
+    final sentMessage = Message(
+      id: messageId,
+      messageType: MessageType.contact,
+      senderPublicKeyPrefix: senderPublicKeyPrefix,
+      pathLen: 0,
+      textType: MessageTextType.plain,
+      senderTimestamp: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      text: text,
+      receivedAt: DateTime.now(),
+      deliveryStatus: MessageDeliveryStatus.sending,
+      recipientPublicKey: opponent.publicKey,
+    );
+    messagesProvider.addSentMessage(sentMessage);
+
+    final sent = await connectionProvider.sendTextMessage(
+      contactPublicKey: opponent.publicKey,
+      text: text,
+      messageId: messageId,
+      contact: opponent,
+    );
+    if (!sent) {
+      messagesProvider.markMessageFailed(messageId);
+      if (!context.mounted) return;
+      ToastLogger.error(context, 'Failed to send Tic-Tac-Toe move');
+    }
+  }
+
+  static String _statusText({
+    required TicTacToeGameState state,
+    required String mySymbol,
+  }) {
+    if (state.winnerSymbol != null) {
+      return state.winnerSymbol == mySymbol ? 'You won' : 'Opponent won';
+    }
+    if (state.isDraw) return 'Draw';
+    return state.nextSymbol == mySymbol ? 'Your turn' : 'Opponent turn';
+  }
+
+  static String _key6Hex(Uint8List key) => key
+      .sublist(0, math.min(6, key.length))
+      .map((b) => b.toRadixString(16).padLeft(2, '0'))
+      .join('')
+      .toLowerCase();
+
+  static Contact? _resolveOpponentContact({
+    required Message message,
+    required ContactsProvider contactsProvider,
+    required bool isSentByMe,
+  }) {
+    if (isSentByMe && message.recipientPublicKey != null) {
+      return contactsProvider.findContactByKey(message.recipientPublicKey!);
+    }
+    final sender = message.senderPublicKeyPrefix;
+    if (sender == null || sender.length < 6) return null;
+    return contactsProvider.findContactByPrefix(
+      Uint8List.fromList(sender.sublist(0, 6)),
+    );
+  }
+
+  static bool _isSameDmThread({
+    required Message message,
+    required Uint8List selfKey,
+    required String opponentKey6,
+  }) {
+    final isOwn = message.isSentMessage || message.isFromSelf(selfKey);
+    if (isOwn) {
+      final recipient = message.recipientPublicKey;
+      if (recipient == null || recipient.length < 6) return false;
+      return _key6Hex(recipient) == opponentKey6;
+    }
+    final sender = message.senderPublicKeyPrefix;
+    if (sender == null || sender.length < 6) return false;
+    return _key6Hex(sender) == opponentKey6;
+  }
+}
+
+class _BoardGrid extends StatelessWidget {
+  final List<String?> board;
+  final bool enabled;
+  final bool isSentByMe;
+  final ValueChanged<int> onTapCell;
+
+  const _BoardGrid({
+    required this.board,
+    required this.enabled,
+    required this.isSentByMe,
+    required this.onTapCell,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final cellBackground = isSentByMe
+        ? colorScheme.primaryContainer.withValues(alpha: 0.35)
+        : colorScheme.surface;
+    final cellBorder = isSentByMe
+        ? colorScheme.primary.withValues(alpha: 0.45)
+        : colorScheme.outline.withValues(alpha: 0.35);
+
+    return SizedBox(
+      width: 180,
+      height: 180,
+      child: GridView.builder(
+        physics: const NeverScrollableScrollPhysics(),
+        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+          crossAxisCount: 3,
+          crossAxisSpacing: 4,
+          mainAxisSpacing: 4,
+        ),
+        itemCount: 9,
+        itemBuilder: (context, idx) {
+          final value = board[idx];
+          return InkWell(
+            onTap: enabled && value == null ? () => onTapCell(idx) : null,
+            borderRadius: BorderRadius.circular(8),
+            child: Container(
+              alignment: Alignment.center,
+              decoration: BoxDecoration(
+                borderRadius: BorderRadius.circular(8),
+                color: cellBackground,
+                border: Border.all(color: cellBorder),
+              ),
+              child: Text(
+                value ?? '',
+                style: Theme.of(context).textTheme.headlineSmall?.copyWith(
+                  fontWeight: FontWeight.w900,
+                  color: value == 'X'
+                      ? colorScheme.primary
+                      : value == 'O'
+                      ? colorScheme.tertiary
+                      : null,
+                ),
+              ),
+            ),
+          );
+        },
+      ),
+    );
+  }
+}

lib/widgets/messages/voice_message_bubble.dart

@@ -1,13 +1,12 @@
 import 'dart:async';
-import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../../l10n/app_localizations.dart';
-import '../../models/contact.dart';
 import '../../models/message.dart';
 import '../../providers/connection_provider.dart';
 import '../../providers/contacts_provider.dart';
 import '../../providers/voice_provider.dart';
+import '../../utils/transmission_target_resolver.dart';
 import '../../utils/voice_message_parser.dart';
 import 'transfer_timeout.dart';
 
@@ -55,8 +54,20 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
 
     return Consumer<VoiceProvider>(
       builder: (context, voiceProvider, _) {
+        final contactsProvider = context.read<ContactsProvider>();
         final session = voiceProvider.session(voiceId);
         final envelope = VoiceEnvelope.tryParseText(widget.message.text);
+        final sender = TransmissionTargetResolver.resolveLocalTarget(
+          contactsProvider: contactsProvider,
+          isSentByMe: widget.isSentByMe,
+          recipientPublicKey: widget.message.recipientPublicKey,
+          senderPublicKeyPrefix: widget.message.senderPublicKeyPrefix,
+          senderKey6FromEnvelope: envelope?.senderKey6,
+          senderName: widget.message.senderName,
+        );
+        final effectivePathLen = sender != null && sender.outPathLen >= 0
+            ? sender.outPathLen
+            : widget.message.pathLen;
         final isPlaying = voiceProvider.isPlaying(voiceId);
         final isComplete = voiceProvider.isComplete(voiceId);
 
@@ -65,6 +76,7 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
             if (!mounted) return;
             setState(() {
               _isRequesting = false;
+              _errorText = null;
             });
           });
         }
@@ -96,12 +108,13 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
           session: session,
           envelope: envelope,
           messageText: widget.message.text,
-          pathLen: widget.message.pathLen,
+          pathLen: effectivePathLen,
           radioBw: radioBw,
           radioSf: radioSf,
           radioCr: radioCr,
         );
         final txEstimateLabel = _formatTransmitEstimate(txEstimate);
+        final eta = voiceProvider.estimateRemainingTransferTime(voiceId);
 
         return Row(
           mainAxisSize: MainAxisSize.min,
@@ -112,6 +125,10 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
                   await voiceProvider.stop();
                   return;
                 }
+                if (_isRequesting) {
+                  _cancelReceive(voiceId);
+                  return;
+                }
                 if (isComplete) {
                   await voiceProvider.play(voiceId);
                   return;
@@ -122,7 +139,7 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
                   radioBw: radioBw,
                   radioSf: radioSf,
                   radioCr: radioCr,
-                  pathLen: widget.message.pathLen,
+                  pathLen: effectivePathLen,
                 );
               },
               borderRadius: BorderRadius.circular(24),
@@ -138,7 +155,7 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
                 child: Icon(
                   isPlaying
                       ? Icons.stop
-                      : (_isRequesting ? Icons.downloading : Icons.play_arrow),
+                      : (_isRequesting ? Icons.close : Icons.play_arrow),
                   size: 28,
                   color: widget.isSentByMe
                       ? Theme.of(context).colorScheme.onPrimaryContainer
@@ -175,6 +192,7 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
                     requestingLabel: AppLocalizations.of(
                       context,
                     )!.requestingVoice,
+                    eta: eta,
                   ),
                   style: TextStyle(
                     fontSize: 11,
@@ -200,34 +218,45 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
     int pathLen = 0,
   }) async {
     if (_isRequesting) return;
-    var sender = _resolveSenderContact();
-    if (sender == null) {
     final connectionProvider = context.read<ConnectionProvider>();
-      await connectionProvider.getContacts();
+    final voiceProvider = context.read<VoiceProvider>();
+    voiceProvider.resumeIncomingSession(sessionId);
+    final contactsProvider = context.read<ContactsProvider>();
+    final resolution = await TransmissionTargetResolver.resolveFetchTarget(
+      contactsProvider: contactsProvider,
+      refreshContacts: connectionProvider.getContacts,
+      isSentByMe: widget.isSentByMe,
+      recipientPublicKey: widget.message.recipientPublicKey,
+      senderPublicKeyPrefix: widget.message.senderPublicKeyPrefix,
+      senderKey6FromEnvelope: envelope?.senderKey6,
+      senderName: widget.message.senderName,
+      maxFetchHops: _maxFetchHops,
+    );
     if (!mounted) return;
-      sender = _resolveSenderContact();
+
-    }
+    if (resolution.failure == TransmissionTargetFailure.unknownContact) {
-    if (sender == null) {
       await _showBlockingAlert(
         'Cannot fetch voice',
         'Sender contact is unknown. Sync contacts first.',
       );
       return;
     }
-    if (sender.outPathLen < 0) {
+    if (resolution.failure == TransmissionTargetFailure.unknownRoute) {
       await _showBlockingAlert(
         'Cannot fetch voice',
         'Sender route is unknown. Sync contacts/path first.',
       );
       return;
     }
-    if (sender.outPathLen > _maxFetchHops) {
+    if (resolution.failure == TransmissionTargetFailure.tooFar) {
       await _showBlockingAlert(
         'Cannot fetch voice',
-        'Message is too far (${sender.outPathLen} hops, max $_maxFetchHops).',
+        'Message is too far (${resolution.hops} hops, max ${resolution.maxHops}).',
       );
       return;
     }
+
+    final sender = resolution.target!;
     if (sender.outPathLen >= 2) {
       _showToast(
         'Voice fetch over ${sender.outPathLen} hops may take a while.',
@@ -239,7 +268,6 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
       _errorText = null;
     });
 
-    final connectionProvider = context.read<ConnectionProvider>();
     final deviceKey = connectionProvider.deviceInfo.publicKey;
     if (deviceKey == null || deviceKey.length < 6) {
       await _showBlockingAlert(
@@ -257,7 +285,7 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
       sessionId: sessionId,
       requesterKey6: requesterKey6,
       timestampSec: DateTime.now().millisecondsSinceEpoch ~/ 1000,
-      version: 1,
+      version: 2,
     );
 
     setState(() {
@@ -266,23 +294,27 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
       _errorText = null;
     });
 
-    final sent = await connectionProvider.sendTextMessage(
+    try {
-      contactPublicKey: sender.publicKey,
+      await connectionProvider.sendRawVoicePacket(
-      text: request.encodeText(),
+        contactPath: sender.outPath,
-      contact: sender,
+        contactPathLen: sender.outPathLen,
+        payload: request.encodeBinary(),
       );
-    if (!sent) {
+    } catch (_) {
       _setUnavailable();
       return;
     }
 
     // Timeout = 2× estimated LoRa airtime (min 30s).
+    final effectivePathLen = sender.outPathLen >= 0
+        ? sender.outPathLen
+        : pathLen;
     final txEstimate = envelope != null
         ? estimateVoiceTransmitDuration(
             packetCount: envelope.total,
             mode: envelope.mode,
             durationMs: envelope.durationMs,
-            pathLen: pathLen,
+            pathLen: effectivePathLen,
             radioBw: radioBw,
             radioSf: radioSf,
             radioCr: radioCr,
@@ -301,6 +333,7 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
 
   void _setUnavailable() {
     if (!mounted) return;
+    _showToast(AppLocalizations.of(context)!.voiceUnavailable);
     setState(() {
       _isRequesting = false;
       _autoPlayWhenReady = false;
@@ -308,34 +341,16 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
     });
   }
 
-  Contact? _resolveSenderContact() {
+  void _cancelReceive(String sessionId) {
-    final contactsProvider = context.read<ContactsProvider>();
+    if (!mounted) return;
-    final senderPrefix = widget.message.senderPublicKeyPrefix;
+    _requestTimeoutTimer?.cancel();
-    if (senderPrefix != null && senderPrefix.length >= 6) {
+    context.read<VoiceProvider>().cancelIncomingSession(sessionId);
-      final contact = contactsProvider.findContactByPrefix(
+    _showToast('Voice receive canceled');
-        Uint8List.fromList(senderPrefix.sublist(0, 6)),
+    setState(() {
-      );
+      _isRequesting = false;
-      if (contact != null) return contact;
+      _autoPlayWhenReady = false;
-    }
+      _errorText = 'Voice receive canceled';
-
+    });
-    final envelope = VoiceEnvelope.tryParseText(widget.message.text);
-    if (envelope != null) {
-      final contact = contactsProvider.findContactByPrefixHex(
-        envelope.senderKey6,
-      );
-      if (contact != null) return contact;
-    }
-
-    final senderName = widget.message.senderName?.trim();
-    if (senderName != null && senderName.isNotEmpty) {
-      for (final contact in contactsProvider.contacts) {
-        if (contact.advName.trim().toLowerCase() == senderName.toLowerCase()) {
-          return contact;
-        }
-      }
-    }
-
-    return null;
   }
 
   void _showToast(String message) {
@@ -347,6 +362,7 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
 
   Future<void> _showBlockingAlert(String title, String message) async {
     if (!mounted) return;
+    _showToast('$title: $message');
     await showDialog<void>(
       context: context,
       builder: (dialogContext) => AlertDialog(
@@ -378,11 +394,12 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
     required bool isRequesting,
     required String? errorText,
     required String requestingLabel,
+    required Duration? eta,
   }) {
     if (errorText != null) return errorText;
     final progress = total > 0 ? ' ($received/$total)' : '';
     if (isRequesting) {
-      return '$requestingLabel$progress · $txEstimateLabel';
+      return '$requestingLabel$progress · ${_formatEta(eta)} · $txEstimateLabel';
     }
     if (!isComplete && total > 0) {
       return '🎙️ $durationLabel · $modeLabel$progress · $txEstimateLabel';
@@ -462,6 +479,14 @@ class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
     final seconds = value.inSeconds % 60;
     return '~${minutes}m ${seconds}s tx';
   }
+
+  static String _formatEta(Duration? eta) {
+    if (eta == null || eta <= Duration.zero) return 'ETA --';
+    if (eta.inSeconds < 60) return 'ETA ~${eta.inSeconds}s';
+    final minutes = eta.inMinutes;
+    final seconds = eta.inSeconds % 60;
+    return 'ETA ~${minutes}m ${seconds}s';
+  }
 }
 
 /// Voice waveform rendered as a row of bars.

pubspec.lock

@@ -883,7 +883,7 @@ packages:
     description:
       path: "."
       ref: main
-      resolved-ref: d6f91774f19136ff71b0087feaf95fa5490524d9
+      resolved-ref: "11f51ccaba850531496179bf63e023cb4c9ad797"
       url: "https://github.com/dz0ny/meshcore_client.git"
     source: git
     version: "0.1.0"

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 2026.0305.1+7
+version: 2026.0305.3+9
 
 environment:
   sdk: ^3.9.2

test/providers/helpers/fragment_ack_wait_registry_test.dart

@@ -0,0 +1,37 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/providers/helpers/fragment_ack_wait_registry.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group('FragmentAckWaitRegistry', () {
+    test('completes multiple waiters registered for the same key', () async {
+      final registry = FragmentAckWaitRegistry();
+
+      final first = registry.waitFor(
+        'voice:1',
+        timeout: const Duration(milliseconds: 200),
+      );
+      final second = registry.waitFor(
+        'voice:1',
+        timeout: const Duration(milliseconds: 200),
+      );
+
+      expect(registry.complete('voice:1'), equals(2));
+      expect(await first, isTrue);
+      expect(await second, isTrue);
+    });
+
+    test('times out and cleans up a waiter when no ack arrives', () async {
+      final registry = FragmentAckWaitRegistry();
+
+      final completed = await registry.waitFor(
+        'voice:2',
+        timeout: const Duration(milliseconds: 20),
+      );
+
+      expect(completed, isFalse);
+      expect(registry.complete('voice:2'), equals(0));
+    });
+  });
+}

test/providers/helpers/raw_session_retransmit_test.dart

@@ -0,0 +1,145 @@
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/models/contact.dart';
+import 'package:meshcore_sar_app/providers/helpers/raw_session_retransmit.dart';
+
+class _Fragment {
+  final int index;
+  final Uint8List payload;
+
+  _Fragment(this.index, this.payload);
+}
+
+Contact _buildContact({required int outPathLen}) {
+  return Contact(
+    publicKey: Uint8List.fromList(List<int>.generate(32, (i) => i)),
+    type: ContactType.chat,
+    flags: 0,
+    outPathLen: outPathLen,
+    outPath: Uint8List.fromList(List<int>.generate(8, (i) => i + 1)),
+    advName: 'Requester',
+    lastAdvert: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+    advLat: 0,
+    advLon: 0,
+    lastMod: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+  );
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group('serveCachedSessionFragments', () {
+    test('returns false when sender callback is missing', () async {
+      final ok = await serveCachedSessionFragments<_Fragment>(
+        providerLabel: 'TestProvider',
+        sessionId: 'deadbeef',
+        requester: _buildContact(outPathLen: 1),
+        fragments: [
+          _Fragment(0, Uint8List.fromList([1])),
+        ],
+        maxDirectPayloadHops: 3,
+        indexOf: (f) => f.index,
+        encodeBinary: (f) => f.payload,
+        sendRawPacket: null,
+      );
+
+      expect(ok, isFalse);
+    });
+
+    test('sends only requested indices and waits for ack', () async {
+      final sent = <Uint8List>[];
+      final waited = <int>[];
+      final ok = await serveCachedSessionFragments<_Fragment>(
+        providerLabel: 'TestProvider',
+        sessionId: 'deadbeef',
+        requester: _buildContact(outPathLen: 1),
+        fragments: [
+          _Fragment(0, Uint8List.fromList([10])),
+          _Fragment(1, Uint8List.fromList([20])),
+          _Fragment(2, Uint8List.fromList([30])),
+        ],
+        maxDirectPayloadHops: 3,
+        indexOf: (f) => f.index,
+        encodeBinary: (f) => f.payload,
+        sendRawPacket:
+            ({
+              required contactPath,
+              required contactPathLen,
+              required payload,
+            }) async {
+              sent.add(payload);
+            },
+        waitForFragmentAck:
+            ({
+              required sessionId,
+              required index,
+              timeout = const Duration(seconds: 8),
+            }) async {
+              waited.add(index);
+              return true;
+            },
+        requestedIndices: {1, 2},
+      );
+
+      expect(ok, isTrue);
+      expect(sent.length, equals(2));
+      expect(sent[0], equals(Uint8List.fromList([20])));
+      expect(sent[1], equals(Uint8List.fromList([30])));
+      expect(waited, equals([1, 2]));
+    });
+
+    test('fails when ack does not arrive', () async {
+      final ok = await serveCachedSessionFragments<_Fragment>(
+        providerLabel: 'TestProvider',
+        sessionId: 'deadbeef',
+        requester: _buildContact(outPathLen: 1),
+        fragments: [
+          _Fragment(0, Uint8List.fromList([1])),
+        ],
+        maxDirectPayloadHops: 3,
+        indexOf: (f) => f.index,
+        encodeBinary: (f) => f.payload,
+        sendRawPacket:
+            ({
+              required contactPath,
+              required contactPathLen,
+              required payload,
+            }) async {},
+        waitForFragmentAck:
+            ({
+              required sessionId,
+              required index,
+              timeout = const Duration(seconds: 8),
+            }) async {
+              return false;
+            },
+      );
+
+      expect(ok, isFalse);
+    });
+
+    test('fails when no requested index matches cached fragments', () async {
+      final ok = await serveCachedSessionFragments<_Fragment>(
+        providerLabel: 'TestProvider',
+        sessionId: 'deadbeef',
+        requester: _buildContact(outPathLen: 1),
+        fragments: [
+          _Fragment(0, Uint8List.fromList([1])),
+        ],
+        maxDirectPayloadHops: 3,
+        indexOf: (f) => f.index,
+        encodeBinary: (f) => f.payload,
+        sendRawPacket:
+            ({
+              required contactPath,
+              required contactPathLen,
+              required payload,
+            }) async {},
+        requestedIndices: {99},
+      );
+
+      expect(ok, isFalse);
+    });
+  });
+}

test/providers/helpers/session_metadata_restore_test.dart

@@ -0,0 +1,86 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/providers/helpers/session_metadata_restore.dart';
+import 'package:meshcore_sar_app/utils/image_message_parser.dart';
+import 'package:meshcore_sar_app/utils/voice_message_parser.dart';
+
+void main() {
+  group('restoreSessionMetadataFromMessages', () {
+    test(
+      'restores voice and image session senders from persisted envelopes',
+      () {
+        final voiceEnvelope = VoiceEnvelope(
+          sessionId: '00112233',
+          mode: VoicePacketMode.mode1200,
+          total: 4,
+          durationMs: 4000,
+          senderKey6: 'AABBCCDDEEFF',
+          timestampSec: 123456,
+        );
+        final imageEnvelope = ImageEnvelope(
+          sessionId: '195cb2fb',
+          format: ImageFormat.avif,
+          total: 7,
+          width: 118,
+          height: 256,
+          sizeBytes: 1069,
+          senderKey6: 'FE8B30EE05FC',
+          timestampSec: 123457,
+        );
+
+        final restored = restoreSessionMetadataFromMessages([
+          'plain text',
+          voiceEnvelope.encodeText(),
+          imageEnvelope.encode(),
+        ]);
+
+        expect(
+          restored.voiceSenderKeyBySession,
+          equals({'00112233': 'aabbccddeeff'}),
+        );
+        expect(restored.imageEnvelopeBySession.keys, equals({'195cb2fb'}));
+        expect(
+          restored.imageEnvelopeBySession['195cb2fb']?.senderKey6,
+          equals('fe8b30ee05fc'),
+        );
+      },
+    );
+
+    test('keeps latest envelope when a session appears multiple times', () {
+      final first = ImageEnvelope(
+        sessionId: '195cb2fb',
+        format: ImageFormat.avif,
+        total: 7,
+        width: 100,
+        height: 100,
+        sizeBytes: 900,
+        senderKey6: '001122334455',
+        timestampSec: 100,
+      );
+      final second = ImageEnvelope(
+        sessionId: '195cb2fb',
+        format: ImageFormat.jpeg,
+        total: 8,
+        width: 118,
+        height: 256,
+        sizeBytes: 1069,
+        senderKey6: 'AABBCCDDEEFF',
+        timestampSec: 101,
+      );
+
+      final restored = restoreSessionMetadataFromMessages([
+        first.encode(),
+        second.encode(),
+      ]);
+
+      expect(restored.imageEnvelopeBySession.length, equals(1));
+      expect(
+        restored.imageEnvelopeBySession['195cb2fb']?.senderKey6,
+        equals('aabbccddeeff'),
+      );
+      expect(
+        restored.imageEnvelopeBySession['195cb2fb']?.format,
+        equals(ImageFormat.jpeg),
+      );
+    });
+  });
+}

test/providers/image_provider_cancel_test.dart

@@ -0,0 +1,52 @@
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/providers/image_provider.dart';
+import 'package:meshcore_sar_app/utils/image_message_parser.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  SharedPreferences.setMockInitialValues({});
+
+  group('ImageProvider cancel receive', () {
+    test('ignores incoming fragments after cancel until resumed', () {
+      final provider = ImageProvider();
+      const sessionId = '01020304';
+      const envelope = ImageEnvelope(
+        sessionId: sessionId,
+        format: ImageFormat.avif,
+        total: 2,
+        width: 32,
+        height: 32,
+        sizeBytes: 4,
+        senderKey6: 'aabbccddeeff',
+        timestampSec: 1700000000,
+      );
+      final fragment = ImagePacket(
+        sessionId: sessionId,
+        format: ImageFormat.avif,
+        index: 0,
+        total: 2,
+        data: Uint8List.fromList([1, 2]),
+      );
+
+      provider.registerEnvelope(envelope);
+      provider.cancelIncomingSession(sessionId);
+
+      expect(provider.isReceiveCanceled(sessionId), isTrue);
+      expect(provider.session(sessionId), isNull);
+
+      provider.addFragment(fragment, width: 32, height: 32);
+
+      expect(provider.session(sessionId), isNull);
+
+      provider.resumeIncomingSession(sessionId);
+      provider.registerEnvelope(envelope);
+      provider.addFragment(fragment, width: 32, height: 32);
+
+      expect(provider.isReceiveCanceled(sessionId), isFalse);
+      expect(provider.session(sessionId)?.receivedCount, equals(1));
+    });
+  });
+}

test/providers/messages_provider_voice_test.dart

@@ -8,7 +8,7 @@ void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
 
   group('MessagesProvider voice detection', () {
-    test('marks VE1 envelope messages as voice', () {
+    test('marks VE2 envelope messages as voice', () {
       final provider = MessagesProvider();
       final envelope = VoiceEnvelope(
         sessionId: 'deafbead',

test/services/cayenne_lpp_parser_test.dart

@@ -410,6 +410,24 @@ void main() {
       expect(decoded.batteryMilliVolts, closeTo(3850, 1));
     });
 
+    test('stops parsing at zero-padded telemetry tail', () {
+      final payload = Uint8List.fromList([
+        0x01, 0x74, 0x01, 0x5F, // voltage 3.51V
+        0x01, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00,
+      ]);
+
+      final decoded = CayenneLppParser.parse(payload);
+
+      expect(decoded.batteryMilliVolts, closeTo(3510, 1));
+      expect(decoded.batteryPercentage, closeTo(42.5, 0.1));
+      expect(decoded.gpsLocation, isNotNull);
+      expect(decoded.gpsLocation!.latitude, 0.0);
+      expect(decoded.gpsLocation!.longitude, 0.0);
+      expect(decoded.extraSensorData?['digital_input_0'], isNull);
+    });
+
     test('empty data returns empty telemetry', () {
       final empty = Uint8List(0);
       final decoded = CayenneLppParser.parse(empty);

test/utils/image_message_parser_test.dart

@@ -0,0 +1,129 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/utils/image_message_parser.dart';
+
+void main() {
+  group('ImageEnvelope', () {
+    test('encodes and parses IE2 with compressed session id', () {
+      final env = ImageEnvelope(
+        sessionId: '0000000a',
+        format: ImageFormat.avif,
+        total: 14,
+        width: 256,
+        height: 171,
+        sizeBytes: 2100,
+        senderKey6: 'aabbccddeeff',
+        timestampSec: 1700000000,
+      );
+
+      final text = env.encode();
+      expect(text.startsWith('IE2:'), isTrue);
+      expect(text.split(':')[1], equals('a'));
+
+      final parsed = ImageEnvelope.tryParse(text);
+      expect(parsed, isNotNull);
+      expect(parsed!.sessionId, equals('0000000a'));
+      expect(parsed.format, equals(ImageFormat.avif));
+      expect(parsed.total, equals(14));
+      expect(parsed.width, equals(256));
+      expect(parsed.height, equals(171));
+      expect(parsed.sizeBytes, equals(2100));
+      expect(parsed.senderKey6, equals('aabbccddeeff'));
+      expect(parsed.version, equals(2));
+    });
+
+    test('rejects IE1 legacy prefix', () {
+      const legacy = 'IE1:deadbeef:0:7:128:128:1050:aabbccddeeff:1700000000:1';
+      expect(ImageEnvelope.tryParse(legacy), isNull);
+    });
+  });
+
+  group('ImageFetchRequest', () {
+    test('encodes and parses IR2 with compressed sid', () {
+      final req = ImageFetchRequest(
+        sessionId: '0000000a',
+        requesterKey6: 'ffeeddccbbaa',
+        timestampSec: 1700000001,
+      );
+
+      final text = req.encode();
+      expect(text.startsWith('IR2:'), isTrue);
+      expect(text.split(':')[1], equals('a'));
+
+      final parsed = ImageFetchRequest.tryParse(text);
+      expect(parsed, isNotNull);
+      expect(parsed!.sessionId, equals('0000000a'));
+      expect(parsed.want, equals('all'));
+      expect(parsed.requesterKey6, equals('ffeeddccbbaa'));
+      expect(parsed.version, equals(2));
+    });
+
+    test('encodes and parses compact missing index ranges', () {
+      final req = ImageFetchRequest(
+        sessionId: '0000000a',
+        want: 'missing',
+        missingIndices: const [0, 1, 2, 5, 6, 8],
+        requesterKey6: 'ffeeddccbbaa',
+        timestampSec: 1700000001,
+      );
+
+      final text = req.encode();
+      expect(text, contains(':m0-2.5-6.8:'));
+
+      final parsed = ImageFetchRequest.tryParse(text);
+      expect(parsed, isNotNull);
+      expect(parsed!.want, equals('missing'));
+      expect(parsed.missingIndices, equals([0, 1, 2, 5, 6, 8]));
+    });
+
+    test('rejects IR1 legacy prefix', () {
+      const legacy = 'IR1:00112233:a:ffeeddccbbaa:1700000001:1';
+      expect(ImageFetchRequest.tryParse(legacy), isNull);
+    });
+
+    test('encodes and parses binary fetch request', () {
+      final req = ImageFetchRequest(
+        sessionId: '01020304',
+        want: 'missing',
+        missingIndices: const [0, 2, 5],
+        requesterKey6: 'ffeeddccbbaa',
+        timestampSec: 1700000001,
+      );
+
+      final payload = req.encodeBinary();
+      expect(ImageFetchRequest.isRequestBinary(payload), isTrue);
+
+      final parsed = ImageFetchRequest.tryParseBinary(payload);
+      expect(parsed, isNotNull);
+      expect(parsed!.sessionId, equals('01020304'));
+      expect(parsed.want, equals('missing'));
+      expect(parsed.missingIndices, equals([0, 2, 5]));
+      expect(parsed.requesterKey6, equals('ffeeddccbbaa'));
+      expect(parsed.version, equals(2));
+    });
+  });
+
+  group('ImageFragmentAck', () {
+    test('encodes and parses binary ack', () {
+      final ack = ImageFragmentAck(sessionId: '01020304', index: 9);
+      final payload = ack.encodeBinary();
+      expect(ImageFragmentAck.isImageFragmentAckBinary(payload), isTrue);
+      final parsed = ImageFragmentAck.tryParseBinary(payload);
+      expect(parsed, isNotNull);
+      expect(parsed!.sessionId, equals('01020304'));
+      expect(parsed.index, equals(9));
+    });
+  });
+
+  group('safeImageDataBytesForPath', () {
+    test('caps direct-route fragments to conservative default size', () {
+      expect(safeImageDataBytesForPath(0), equals(ImagePacket.maxDataBytes));
+    });
+
+    test('shrinks for longer paths but never exceeds conservative default', () {
+      expect(
+        safeImageDataBytesForPath(2),
+        lessThanOrEqualTo(ImagePacket.maxDataBytes),
+      );
+    });
+  });
+}

test/utils/voice_message_parser_test.dart

@@ -6,74 +6,122 @@ void main() {
   group('VoiceEnvelope', () {
     test('encodes and parses valid envelope', () {
       final env = VoiceEnvelope(
-        sessionId: 'deadbeef',
+        sessionId: '0000000a',
         mode: VoicePacketMode.mode1200,
         total: 4,
-        durationMs: 3200,
+        durationMs: 3000,
         senderKey6: 'aabbccddeeff',
         timestampSec: 1700000000,
       );
 
       final text = env.encodeText();
       expect(VoiceEnvelope.isVoiceEnvelopeText(text), isTrue);
+      expect(text.startsWith('VE2:'), isTrue);
+      expect(text.split(':')[1], equals('a'));
 
       final parsed = VoiceEnvelope.tryParseText(text);
       expect(parsed, isNotNull);
-      expect(parsed!.sessionId, equals('deadbeef'));
+      expect(parsed!.sessionId, equals('0000000a'));
       expect(parsed.mode, equals(VoicePacketMode.mode1200));
       expect(parsed.total, equals(4));
-      expect(parsed.durationMs, equals(3200));
+      expect(parsed.durationMs, equals(3000));
       expect(parsed.senderKey6, equals('aabbccddeeff'));
-      expect(parsed.version, equals(1));
+      expect(parsed.version, equals(2));
     });
 
     test('rejects invalid envelope payload', () {
-      final text = 'VE1:nothex:1:2:1000:aabbccddeeff:1700000000:1';
+      final text = 'VE2:bad_sid:1:2:1000:aabbccddeeff:s44we8';
       expect(VoiceEnvelope.tryParseText(text), isNull);
     });
+
+    test('rejects legacy v1 envelope prefix', () {
+      const legacy = 'VE1:deadbeef:1:4:3200:aabbccddeeff:1700000000:1';
+      expect(VoiceEnvelope.tryParseText(legacy), isNull);
+    });
   });
 
   group('VoiceFetchRequest', () {
     test('encodes and parses valid request', () {
       final req = VoiceFetchRequest(
-        sessionId: '00112233',
+        sessionId: '0000000a',
         requesterKey6: 'ffeeddccbbaa',
         timestampSec: 1700000001,
       );
       final text = req.encodeText();
       expect(VoiceFetchRequest.isVoiceFetchRequestText(text), isTrue);
+      expect(text.startsWith('VR2:'), isTrue);
+      expect(text.split(':')[1], equals('a'));
 
       final parsed = VoiceFetchRequest.tryParseText(text);
       expect(parsed, isNotNull);
-      expect(parsed!.sessionId, equals('00112233'));
+      expect(parsed!.sessionId, equals('0000000a'));
       expect(parsed.want, equals('all'));
       expect(parsed.requesterKey6, equals('ffeeddccbbaa'));
-      expect(parsed.version, equals(1));
+      expect(parsed.version, equals(2));
     });
 
     test('rejects invalid request payload', () {
       expect(
         VoiceFetchRequest.tryParseText(
-          'VR1:00112233:chunk:ffeeddccbbaa:1700000001:1',
+          'VR2:a:chunk:ffeeddccbbaa:s44we9',
         ),
         isNull,
       );
     });
 
+    test('rejects legacy v1 request prefix', () {
+      const legacy = 'VR1:00112233:a:ffeeddccbbaa:1700000001:1';
+      expect(VoiceFetchRequest.tryParseText(legacy), isNull);
+    });
+
     test('encodes and parses missing-packet request', () {
       final req = VoiceFetchRequest(
-        sessionId: '00112233',
+        sessionId: '0000000a',
         want: 'missing',
-        missingIndices: const [0, 3, 7],
+        missingIndices: const [0, 1, 2, 3, 7],
         requesterKey6: 'ffeeddccbbaa',
         timestampSec: 1700000001,
       );
       final text = req.encodeText();
+      expect(text, contains(':m0-3.7:'));
 
       final parsed = VoiceFetchRequest.tryParseText(text);
       expect(parsed, isNotNull);
       expect(parsed!.want, equals('missing'));
-      expect(parsed.missingIndices, equals([0, 3, 7]));
+      expect(parsed.missingIndices, equals([0, 1, 2, 3, 7]));
+    });
+
+    test('encodes and parses binary fetch request', () {
+      final req = VoiceFetchRequest(
+        sessionId: '01020304',
+        want: 'missing',
+        missingIndices: const [1, 4],
+        requesterKey6: 'ffeeddccbbaa',
+        timestampSec: 1700000001,
+      );
+
+      final payload = req.encodeBinary();
+      expect(VoiceFetchRequest.isVoiceFetchRequestBinary(payload), isTrue);
+
+      final parsed = VoiceFetchRequest.tryParseBinary(payload);
+      expect(parsed, isNotNull);
+      expect(parsed!.sessionId, equals('01020304'));
+      expect(parsed.want, equals('missing'));
+      expect(parsed.missingIndices, equals([1, 4]));
+      expect(parsed.requesterKey6, equals('ffeeddccbbaa'));
+      expect(parsed.version, equals(2));
+    });
+  });
+
+  group('VoiceFragmentAck', () {
+    test('encodes and parses binary ack', () {
+      final ack = VoiceFragmentAck(sessionId: '01020304', index: 7);
+      final payload = ack.encodeBinary();
+      expect(VoiceFragmentAck.isVoiceFragmentAckBinary(payload), isTrue);
+      final parsed = VoiceFragmentAck.tryParseBinary(payload);
+      expect(parsed, isNotNull);
+      expect(parsed!.sessionId, equals('01020304'));
+      expect(parsed.index, equals(7));
     });
   });