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feat: Estimate contact location from RSSI + last-hop repeater

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For contacts without GPS, estimate their position by:
1. Finding the first-hop repeater from their routing path
2. Estimating distance from RSSI using log-distance path loss model
3. Placing them at a deterministic offset from the repeater

Uses LoRa outdoor path loss exponent (n=3.0) with reference RSSI
-30dBm at 1m. Distance clamped to 10m-50km range. Bearing derived
from contact public key hash for stable positioning.
This commit is contained in:
Janez T
2026-03-17 11:08:56 +01:00
parent c01ef7a059
commit d29b85feb8
5 changed files with 161 additions and 3 deletions
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25
lib/providers/contacts_provider.dart
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@@ -128,6 +128,7 @@ class ContactsProvider with ChangeNotifier {
final Map<String, Contact> _contacts = {};
final List<SavedContactGroup> _savedContactGroups = <SavedContactGroup>[];
final Map<String, PendingAdvert> _pendingAdverts = {};
final Map<String, LatLng> _estimatedLocations = {};
final ContactStorageService _storageService = ContactStorageService();
bool _isInitialized = false;
bool _isPersisting = false;
@@ -501,13 +502,33 @@ class ContactsProvider with ChangeNotifier {
..sort(_sortByLastSeen);
}
/// All estimated locations (for passing to map marker service).
Map<String, LatLng> get estimatedLocations =>
Map.unmodifiable(_estimatedLocations);
/// Get estimated location for a contact (RSSI-based, near last-hop repeater).
LatLng? estimatedLocationFor(String publicKeyHex) =>
_estimatedLocations[publicKeyHex];
/// Set an estimated location for a contact that has no GPS.
void setEstimatedLocation(String publicKeyHex, LatLng location) {
_estimatedLocations[publicKeyHex] = location;
notifyListeners();
}
/// Effective location: own GPS/advert > estimated from RSSI.
LatLng? effectiveLocationFor(Contact contact) {
return contact.displayLocation ?? _estimatedLocations[contact.publicKeyHex];
}
/// Get contacts with location (for map display)
/// Includes contacts with estimated locations from RSSI.
List<Contact> get contactsWithLocation =>
contacts.where((c) => c.displayLocation != null).toList();
contacts.where((c) => effectiveLocationFor(c) != null).toList();
/// Get chat contacts with location (team members on map)
List<Contact> get chatContactsWithLocation =>
chatContacts.where((c) => c.displayLocation != null).toList();
chatContacts.where((c) => effectiveLocationFor(c) != null).toList();
MessageContactLocation? buildMessageContactLocationSnapshot(
Contact contact, {