MeshCore SAR

Flutter app for Search and Rescue operations over a MeshCore mesh radio network via Bluetooth Low Energy.

Features

Messaging — send/receive messages to contacts and channels
Contacts — track team members, repeaters, and rooms with live telemetry
SAR Markers — drop emoji-coded location pins (person found, fire, staging area) via chat messages
Map — view team positions and markers on OpenStreetMap / topo / satellite; tiles cached for offline use
Location tracking — periodic GPS updates broadcast to the mesh
Packet log — inspect raw BLE frames for debugging

BLE Protocol

The BLE communication layer lives in a separate reusable package: github.com/dz0ny/meshcore_client

It handles connection management, command queueing, and binary frame parsing/building.

Requirements

Flutter 3.19+ / Dart 3.3+
Physical device with Bluetooth (BLE does not work on simulators)
iOS 13+ or Android SDK 21+

Build

flutter pub get
flutter run                        # debug
flutter build apk --release        # Android
flutter build ios --release        # iOS

iOS signing

open ios/Runner.xcworkspace
# Select team in Signing & Capabilities, then run from Xcode

Clean rebuild

flutter clean && flutter pub get
cd ios && pod deintegrate && pod install && cd ..

Permissions

Platform	Permissions
iOS	Bluetooth, Location (when in use)
Android	`BLUETOOTH_SCAN`, `BLUETOOTH_CONNECT`, `ACCESS_FINE_LOCATION`, `INTERNET`

SAR Marker format

S:<emoji>:<lat>,<lon>

Examples: S:🧑:46.0569,14.5058 · S:🔥:46.057,14.506 · S:🏕️:46.0571,14.506

Architecture

lib/
├── models/       — data types (re-exported from meshcore_client)
├── providers/    — state management (Provider pattern)
├── screens/      — top-level pages
├── services/     — location tracking, SSE bridge, tile cache
└── widgets/      — reusable UI components

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