fix: simplify method call for writing data in UsbSerialService

- Fix operator precedence bug in _handleAutoAddConfig where `flags &
  flag != 0` was parsed as `flags & (flag != 0)`, always checking bit 0
  instead of the correct flag bit
- Populate _contacts from cache in loadContactCache() so contacts
  persist across app restarts
- Toggle DTR low→high on USB connect to force device to see a fresh
  connection
- Add 10ms inter-frame delay for USB sends to prevent missed responses
- Deassert DTR before closing USB port on disconnect/dispose

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.swift-version

@@ -0,0 +1 @@
+6.2.4

lib/connector/meshcore_connector.dart

@@ -199,6 +199,9 @@ class MeshCoreConnector extends ChangeNotifier {
   int _queueSyncRetries = 0;
   static const int _maxQueueSyncRetries = 3;
   static const int _queueSyncTimeoutMs = 5000; // 5 second timeout
+  // Serializes path operations (setContactPath/clearContactPath) to prevent
+  // interleaved async calls from leaving in-memory state inconsistent with device.
+  Future<void> _pathOpLock = Future.value();
   Map<String, String>? _currentCustomVars;
 
   // Channel syncing state (sequential pattern)
@@ -286,6 +289,10 @@ class MeshCoreConnector extends ChangeNotifier {
     );
   }
 
+  List<Contact> get allContacts => List.unmodifiable([
+    ..._contacts,
+    ..._discoveredContacts.where((c) => !c.isActive),
+  ]);
   List<Contact> get discoveredContacts {
     return List.unmodifiable(_discoveredContacts);
   }
@@ -558,6 +565,10 @@ class MeshCoreConnector extends ChangeNotifier {
       _unreadStore.saveContactUnreadCount(
         Map<String, int>.from(_contactUnreadCount),
       );
+      _notificationService.clearContactNotification(
+        contactKeyHex,
+        getTotalUnreadCount(),
+      );
       notifyListeners();
     }
   }
@@ -576,6 +587,10 @@ class MeshCoreConnector extends ChangeNotifier {
           _channels.isNotEmpty ? _channels : _cachedChannels,
         ),
       );
+      _notificationService.clearChannelNotification(
+        channelIndex,
+        getTotalUnreadCount(),
+      );
       notifyListeners();
     }
   }
@@ -693,6 +708,9 @@ class MeshCoreConnector extends ChangeNotifier {
     _knownContactKeys
       ..clear()
       ..addAll(cached.map((c) => c.publicKeyHex));
+    _contacts
+      ..clear()
+      ..addAll(cached);
     for (final contact in cached) {
       _ensureContactSmazSettingLoaded(contact.publicKeyHex);
     }
@@ -1525,6 +1543,10 @@ class MeshCoreConnector extends ChangeNotifier {
 
     if (_activeTransport == MeshCoreTransportType.usb) {
       await _usbManager.write(data);
+      // Brief pause so the device firmware can process each frame before the
+      // next arrives. Without this, rapid-fire frames over USB can cause the
+      // device to miss responses (especially on reconnect).
+      await Future<void>.delayed(const Duration(milliseconds: 10));
     } else if (_activeTransport == MeshCoreTransportType.tcp) {
       await _tcpConnector.write(data);
     } else {
@@ -1740,18 +1762,33 @@ class MeshCoreConnector extends ChangeNotifier {
     Uint8List customPath,
     int pathLen,
   ) async {
-    if (!isConnected) return;
+    // Serialize path operations to prevent interleaved async calls from
+    // leaving in-memory state inconsistent with the device.
+    final prev = _pathOpLock;
+    final completer = Completer<void>();
+    _pathOpLock = completer.future;
+    await prev;
+    try {
+      if (!isConnected) return;
 
-    await sendFrame(
-      buildUpdateContactPathFrame(
-        contact.publicKey,
-        customPath,
-        pathLen,
-        type: contact.type,
-        flags: contact.flags,
-        name: contact.name,
-      ),
-    );
+      await sendFrame(
+        buildUpdateContactPathFrame(
+          contact.publicKey,
+          customPath,
+          pathLen,
+          type: contact.type,
+          flags: contact.flags,
+          name: contact.name,
+        ),
+      );
+      // USB writes return instantly (no BLE flow control), so give the firmware
+      // time to persist the path change before subsequent commands.
+      if (_activeTransport == MeshCoreTransportType.usb) {
+        await Future<void>.delayed(const Duration(milliseconds: 100));
+      }
+    } finally {
+      completer.complete();
+    }
   }
 
   Future<void> setContactFavorite(Contact contact, bool isFavorite) async {
@@ -2136,25 +2173,34 @@ class MeshCoreConnector extends ChangeNotifier {
   }
 
   Future<void> clearContactPath(Contact contact) async {
-    if (!isConnected) return;
+    // Serialize path operations to prevent interleaved async calls.
+    final prev = _pathOpLock;
+    final completer = Completer<void>();
+    _pathOpLock = completer.future;
+    await prev;
+    try {
+      if (!isConnected) return;
 
-    await sendFrame(buildResetPathFrame(contact.publicKey));
-    final existingIndex = _contacts.indexWhere(
-      (c) => c.publicKeyHex == contact.publicKeyHex,
-    );
-    if (existingIndex >= 0) {
-      final existing = _contacts[existingIndex];
-      // Use copyWith to preserve pathOverride and pathOverrideBytes
-      _contacts[existingIndex] = existing.copyWith(
-        pathOverride: null,
-        pathOverrideBytes: null,
-        pathLength: -1,
-        path: Uint8List(0),
+      await sendFrame(buildResetPathFrame(contact.publicKey));
+      if (_activeTransport == MeshCoreTransportType.usb) {
+        await Future<void>.delayed(const Duration(milliseconds: 100));
+      }
+      final existingIndex = _contacts.indexWhere(
+        (c) => c.publicKeyHex == contact.publicKeyHex,
       );
-      notifyListeners();
-      unawaited(_persistContacts());
+      if (existingIndex >= 0) {
+        final existing = _contacts[existingIndex];
+        // Preserve pathOverride and pathOverrideBytes — only reset device path
+        _contacts[existingIndex] = existing.copyWith(
+          pathLength: -1,
+          path: Uint8List(0),
+        );
+        notifyListeners();
+        unawaited(_persistContacts());
+      }
+    } finally {
+      completer.complete();
     }
-    // The device will send updated contact info with path_len = -1
   }
 
   void updateContactInMemory(
@@ -2490,6 +2536,9 @@ class MeshCoreConnector extends ChangeNotifier {
         _isLoadingContacts = true;
         notifyListeners();
         break;
+      case pushCodeAdvert:
+        // Known contact was seen again - just a pub key, no action needed
+        break;
       case pushCodeNewAdvert:
         debugPrint('Got New CONTACT');
         // It's the same format as respCodeContact, so we can reuse the handler
@@ -2871,6 +2920,8 @@ class MeshCoreConnector extends ChangeNotifier {
   void _handleContact(Uint8List frame, {bool isContact = true}) {
     final contact = Contact.fromFrame(frame);
     if (contact != null) {
+      _handleDiscovery(contact, frame, noNotify: true, addActive: true);
+
       if (contact.type == advTypeRepeater) {
         _contactUnreadCount.remove(contact.publicKeyHex);
         _unreadStore.saveContactUnreadCount(
@@ -4679,6 +4730,12 @@ class MeshCoreConnector extends ChangeNotifier {
           (_autoAddRoomServers && type == advTypeRoom) ||
           (_autoAddSensors && type == advTypeSensor)) {
         _handleContactAdvert(newContact);
+        _handleDiscovery(
+          newContact,
+          rawPacket,
+          noNotify: true,
+          addActive: true,
+        );
       } else {
         _handleDiscovery(newContact, rawPacket);
       }
@@ -4703,8 +4760,20 @@ class MeshCoreConnector extends ChangeNotifier {
 
       // CRITICAL: Preserve user's path override when contact is refreshed from device
       _contacts[existingIndex] = existing.copyWith(
-        latitude: hasLocation ? latitude : existing.latitude,
-        longitude: hasLocation ? longitude : existing.longitude,
+        latitude:
+            hasLocation &&
+                latitude != null &&
+                latitude.abs() <= 90 &&
+                (latitude != 0 || longitude != 0)
+            ? latitude
+            : existing.latitude,
+        longitude:
+            hasLocation &&
+                longitude != null &&
+                longitude.abs() <= 180 &&
+                (latitude != 0 || longitude != 0)
+            ? longitude
+            : existing.longitude,
         name: hasName ? name : existing.name,
         path: Uint8List.fromList(path.reversed.toList()),
         pathLength: path.length,
@@ -4775,11 +4844,11 @@ class MeshCoreConnector extends ChangeNotifier {
     try {
       reader.skipBytes(1); // Skip the response code byte
       final flags = reader.readByte();
-      _autoAddUsers = flags & autoAddChatFlag != 0;
-      _autoAddRepeaters = flags & autoAddRepeaterFlag != 0;
-      _autoAddRoomServers = flags & autoAddRoomServerFlag != 0;
-      _autoAddSensors = flags & autoAddSensorFlag != 0;
-      _overwriteOldest = flags & autoAddOverwriteOldestFlag != 0;
+      _autoAddUsers = (flags & autoAddChatFlag) != 0;
+      _autoAddRepeaters = (flags & autoAddRepeaterFlag) != 0;
+      _autoAddRoomServers = (flags & autoAddRoomServerFlag) != 0;
+      _autoAddSensors = (flags & autoAddSensorFlag) != 0;
+      _overwriteOldest = (flags & autoAddOverwriteOldestFlag) != 0;
     } catch (e) {
       appLogger.error('Failed to parse auto-add config: $e', tag: 'Connector');
     }
@@ -4789,6 +4858,7 @@ class MeshCoreConnector extends ChangeNotifier {
     Contact contact,
     Uint8List rawPacket, {
     bool noNotify = false,
+    bool addActive = false,
   }) {
     appLogger.info('Discovered new contact: ${contact.name}', tag: 'Connector');
 
@@ -4809,7 +4879,7 @@ class MeshCoreConnector extends ChangeNotifier {
             longitude: contact.longitude,
             lastSeen: contact.lastSeen,
             flags: 0,
-            isActive: false,
+            isActive: addActive,
           );
       notifyListeners();
       unawaited(_persistDiscoveredContacts());
@@ -4827,7 +4897,7 @@ class MeshCoreConnector extends ChangeNotifier {
       longitude: contact.longitude,
       lastSeen: contact.lastSeen,
       lastMessageAt: contact.lastMessageAt,
-      isActive: false,
+      isActive: addActive,
       flags: 0,
     );
     _discoveredContacts.add(disContact);

lib/connector/meshcore_connector_usb.dart

@@ -64,6 +64,8 @@ class MeshCoreUsbManager {
 
   Future<void> write(Uint8List data) => _service.write(data);
 
+  Future<void> writeRaw(Uint8List data) => _service.writeRaw(data);
+
   // --- Label management ---
   void updateConnectedLabel(String selfName) {
     _service.updateConnectedLabel(selfName);

lib/l10n/app_bg.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "Транспортът чрез TCP не се поддържа на тази платформа.",
   "tcpErrorTimedOut": "Връзката TCP изтекла.",
   "tcpConnectionFailed": "Неуспешно е установено TCP връзката: {error}",
-  "map_showDiscoveryContacts": "Покажи контакти за откриване"
+  "map_showDiscoveryContacts": "Покажи контакти за откриване",
+  "map_setAsMyLocation": "Задайте като моя местоположение"
 }

lib/l10n/app_de.arb

@@ -1915,5 +1915,6 @@
   "tcpErrorUnsupported": "Die TCP-Übertragung wird auf dieser Plattform nicht unterstützt.",
   "tcpErrorTimedOut": "Die TCP-Verbindung ist abgelaufen.",
   "tcpConnectionFailed": "Fehler beim TCP-Verbindungsaufbau: {error}",
-  "map_showDiscoveryContacts": "Entdeckungs-Kontakte anzeigen"
+  "map_showDiscoveryContacts": "Entdeckungs-Kontakte anzeigen",
+  "map_setAsMyLocation": "Als meine aktuelle Position festlegen"
 }

lib/l10n/app_en.arb

@@ -807,6 +807,7 @@
   "map_source": "Source",
   "map_flags": "Flags",
   "map_shareMarkerHere": "Share marker here",
+  "map_setAsMyLocation": "Set as my location",
   "map_pinLabel": "Pin label",
   "map_label": "Label",
   "map_pointOfInterest": "Point of interest",

lib/l10n/app_es.arb

@@ -1915,5 +1915,6 @@
   "tcpErrorUnsupported": "El protocolo de transporte TCP no está soportado en esta plataforma.",
   "tcpErrorTimedOut": "La conexión TCP ha caducado.",
   "tcpConnectionFailed": "Error en la conexión TCP: {error}",
-  "map_showDiscoveryContacts": "Mostrar Contactos de Descubrimiento"
+  "map_showDiscoveryContacts": "Mostrar Contactos de Descubrimiento",
+  "map_setAsMyLocation": "Establecer mi ubicación"
 }

lib/l10n/app_fr.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "Le protocole TCP n'est pas pris en charge sur cette plateforme.",
   "tcpErrorTimedOut": "La connexion TCP a expiré.",
   "tcpConnectionFailed": "Échec de la connexion TCP : {error}",
-  "map_showDiscoveryContacts": "Afficher les contacts de découverte"
+  "map_showDiscoveryContacts": "Afficher les contacts de découverte",
+  "map_setAsMyLocation": "Définir comme ma localisation"
 }

lib/l10n/app_it.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "Il protocollo TCP non è supportato su questa piattaforma.",
   "tcpErrorTimedOut": "La connessione TCP è scaduta.",
   "tcpConnectionFailed": "Impossibile stabilire la connessione TCP: {error}",
-  "map_showDiscoveryContacts": "Mostra Contatti di Discovery"
+  "map_showDiscoveryContacts": "Mostra Contatti di Discovery",
+  "map_setAsMyLocation": "Imposta come la mia posizione"
 }

lib/l10n/app_localizations.dart

@@ -2746,6 +2746,12 @@ abstract class AppLocalizations {
   /// **'Share marker here'**
   String get map_shareMarkerHere;
 
+  /// No description provided for @map_setAsMyLocation.
+  ///
+  /// In en, this message translates to:
+  /// **'Set as my location'**
+  String get map_setAsMyLocation;
+
   /// No description provided for @map_pinLabel.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_bg.dart

@@ -1511,6 +1511,9 @@ class AppLocalizationsBg extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Споделете маркер тук';
 
+  @override
+  String get map_setAsMyLocation => 'Задайте като моя местоположение';
+
   @override
   String get map_pinLabel => 'Етикетиране на пин';
 

lib/l10n/app_localizations_de.dart

@@ -1513,6 +1513,9 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Teilen Sie den Marker hier.';
 
+  @override
+  String get map_setAsMyLocation => 'Als meine aktuelle Position festlegen';
+
   @override
   String get map_pinLabel => 'Pin Name';
 

lib/l10n/app_localizations_en.dart

@@ -1487,6 +1487,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Share marker here';
 
+  @override
+  String get map_setAsMyLocation => 'Set as my location';
+
   @override
   String get map_pinLabel => 'Pin label';
 

lib/l10n/app_localizations_es.dart

@@ -1509,6 +1509,9 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Compartir marcador aquí';
 
+  @override
+  String get map_setAsMyLocation => 'Establecer mi ubicación';
+
   @override
   String get map_pinLabel => 'Etiqueta de marcador';
 

lib/l10n/app_localizations_fr.dart

@@ -1518,6 +1518,9 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Partager le marqueur ici';
 
+  @override
+  String get map_setAsMyLocation => 'Définir comme ma localisation';
+
   @override
   String get map_pinLabel => 'Étiquete de repin';
 

lib/l10n/app_localizations_it.dart

@@ -1510,6 +1510,9 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Condividi marcatore qui';
 
+  @override
+  String get map_setAsMyLocation => 'Imposta come la mia posizione';
+
   @override
   String get map_pinLabel => 'Etichetta PIN';
 

lib/l10n/app_localizations_nl.dart

@@ -1502,6 +1502,9 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Deel marker hier';
 
+  @override
+  String get map_setAsMyLocation => 'Stel dit in als mijn locatie';
+
   @override
   String get map_pinLabel => 'Label vastzetten';
 

lib/l10n/app_localizations_pl.dart

@@ -1512,6 +1512,9 @@ class AppLocalizationsPl extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Udostępnij znacznik tutaj';
 
+  @override
+  String get map_setAsMyLocation => 'Ustaw jako moje lokalizację';
+
   @override
   String get map_pinLabel => 'Oznacz etykietę';
 

lib/l10n/app_localizations_pt.dart

@@ -1511,6 +1511,9 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Compartilhar marcador aqui';
 
+  @override
+  String get map_setAsMyLocation => 'Defina minha localização';
+
   @override
   String get map_pinLabel => 'Rótulo de marcador';
 

lib/l10n/app_localizations_ru.dart

@@ -1513,6 +1513,9 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Поделиться меткой здесь';
 
+  @override
+  String get map_setAsMyLocation => 'Установить мое местоположение';
+
   @override
   String get map_pinLabel => 'Метка';
 

lib/l10n/app_localizations_sk.dart

@@ -1504,6 +1504,9 @@ class AppLocalizationsSk extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Zdieľte značku tu';
 
+  @override
+  String get map_setAsMyLocation => 'Nastavte ako moju polohu';
+
   @override
   String get map_pinLabel => 'Označka upozornenia';
 

lib/l10n/app_localizations_sl.dart

@@ -1498,6 +1498,9 @@ class AppLocalizationsSl extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Delite točke tukaj.';
 
+  @override
+  String get map_setAsMyLocation => 'Nastavite to kot mojo lokacijo';
+
   @override
   String get map_pinLabel => 'Oznaka za pritrditev';
 

lib/l10n/app_localizations_sv.dart

@@ -1494,6 +1494,9 @@ class AppLocalizationsSv extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Dela markeringen här';
 
+  @override
+  String get map_setAsMyLocation => 'Ange som min plats';
+
   @override
   String get map_pinLabel => 'Fästetikett';
 

lib/l10n/app_localizations_uk.dart

@@ -1510,6 +1510,9 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get map_shareMarkerHere => 'Поділитися маркером тут';
 
+  @override
+  String get map_setAsMyLocation => 'Встановити моє місцезнаходження';
+
   @override
   String get map_pinLabel => 'Мітка піна';
 

lib/l10n/app_localizations_zh.dart

@@ -1421,6 +1421,9 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get map_shareMarkerHere => '在此分享标记';
 
+  @override
+  String get map_setAsMyLocation => '设置为我的位置';
+
   @override
   String get map_pinLabel => '标签';
 

lib/l10n/app_nl.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "TCP-transport wordt niet ondersteund op deze platform.",
   "tcpErrorTimedOut": "De TCP-verbinding is verlopen.",
   "tcpConnectionFailed": "Verbinding met TCP mislukt: {error}",
-  "map_showDiscoveryContacts": "Ontdek contacten weergeven"
+  "map_showDiscoveryContacts": "Ontdek contacten weergeven",
+  "map_setAsMyLocation": "Stel dit in als mijn locatie"
 }

lib/l10n/app_pl.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "Transport protokoł TCP nie jest obsługiwany na tym urządzeniu.",
   "tcpErrorTimedOut": "Połączenie TCP zakończyło się bez powodzenia.",
   "tcpConnectionFailed": "Błąd połączenia TCP: {error}",
-  "map_showDiscoveryContacts": "Pokaż kontakty odkrywania"
+  "map_showDiscoveryContacts": "Pokaż kontakty odkrywania",
+  "map_setAsMyLocation": "Ustaw jako moje lokalizację"
 }

lib/l10n/app_pt.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "O protocolo TCP não é suportado nesta plataforma.",
   "tcpErrorTimedOut": "A conexão TCP expirou.",
   "tcpConnectionFailed": "Falha na conexão TCP: {error}",
-  "map_showDiscoveryContacts": "Mostrar Contatos de Descoberta"
+  "map_showDiscoveryContacts": "Mostrar Contatos de Descoberta",
+  "map_setAsMyLocation": "Defina minha localização"
 }

lib/l10n/app_ru.arb

@@ -1127,5 +1127,6 @@
   "tcpErrorUnsupported": "Протокол TCP не поддерживается на этой платформе.",
   "tcpErrorTimedOut": "Соединение TCP не удалось установить.",
   "tcpConnectionFailed": "Не удалось установить соединение TCP: {error}",
-  "map_showDiscoveryContacts": "Показать контакты Discovery"
+  "map_showDiscoveryContacts": "Показать контакты Discovery",
+  "map_setAsMyLocation": "Установить мое местоположение"
 }

lib/l10n/app_sk.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "Prevoz prostredníctvom protokolu TCP nie je na tejto platforme podporovaný.",
   "tcpErrorTimedOut": "Pripojenie TCP vypršalo.",
   "tcpConnectionFailed": "Neúspešné vytvorenie TCP spojenia: {error}",
-  "map_showDiscoveryContacts": "Zobraziť kontakty objavov"
+  "map_showDiscoveryContacts": "Zobraziť kontakty objavov",
+  "map_setAsMyLocation": "Nastavte ako moju polohu"
 }

lib/l10n/app_sl.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "Transport preko protokola TCP ni podprt na tej platformi.",
   "tcpErrorTimedOut": "Povezava TCP je presegla časovno obdobje.",
   "tcpConnectionFailed": "Napaka pri povezavi TCP: {error}",
-  "map_showDiscoveryContacts": "Prikaži odkritja kontaktov"
+  "map_showDiscoveryContacts": "Prikaži odkritja kontaktov",
+  "map_setAsMyLocation": "Nastavite to kot mojo lokacijo"
 }

lib/l10n/app_sv.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "TCP-transport fungerar inte på denna plattform.",
   "tcpErrorTimedOut": "TCP-anslutningen har tidsut gått.",
   "tcpConnectionFailed": "Fel vid TCP-anslutning: {error}",
-  "map_showDiscoveryContacts": "Visa Discovery-kontakter"
+  "map_showDiscoveryContacts": "Visa Discovery-kontakter",
+  "map_setAsMyLocation": "Ange som min plats"
 }

lib/l10n/app_uk.arb

@@ -1887,5 +1887,6 @@
   "tcpErrorUnsupported": "Транспорт TCP не підтримується на цій платформі.",
   "tcpErrorTimedOut": "З'єднання TCP завершилося через закінчення часу очікування.",
   "tcpConnectionFailed": "Не вдалося встановити з'єднання TCP: {error}",
-  "map_showDiscoveryContacts": "Показати контакти Відкриття"
+  "map_showDiscoveryContacts": "Показати контакти Відкриття",
+  "map_setAsMyLocation": "Встановити моє місцезнаходження"
 }

lib/l10n/app_zh.arb

@@ -1892,5 +1892,6 @@
   "tcpErrorUnsupported": "此平台不支持 TCP 传输。",
   "tcpErrorTimedOut": "TCP 连接超时。",
   "tcpConnectionFailed": "TCP 连接失败：{error}",
-  "map_showDiscoveryContacts": "显示发现联系人"
+  "map_showDiscoveryContacts": "显示发现联系人",
+  "map_setAsMyLocation": "设置为我的位置"
 }

lib/models/app_settings.dart

@@ -40,6 +40,8 @@ class AppSettings {
   final UnitSystem unitSystem;
   final Set<String> mutedChannels;
   final bool mapShowDiscoveryContacts;
+  final String tcpServerAddress;
+  final int tcpServerPort;
 
   AppSettings({
     this.clearPathOnMaxRetry = false,
@@ -68,6 +70,8 @@ class AppSettings {
     this.unitSystem = UnitSystem.metric,
     Set<String>? mutedChannels,
     this.mapShowDiscoveryContacts = true,
+    this.tcpServerAddress = '',
+    this.tcpServerPort = 0,
   }) : batteryChemistryByDeviceId = batteryChemistryByDeviceId ?? {},
        batteryChemistryByRepeaterId = batteryChemistryByRepeaterId ?? {},
        mutedChannels = mutedChannels ?? {};
@@ -100,6 +104,8 @@ class AppSettings {
       'unit_system': unitSystem.value,
       'muted_channels': mutedChannels.toList(),
       'map_show_discovery_contacts': mapShowDiscoveryContacts,
+      'tcp_server_address': tcpServerAddress,
+      'tcp_server_port': tcpServerPort,
     };
   }
 
@@ -157,6 +163,8 @@ class AppSettings {
           {},
       mapShowDiscoveryContacts:
           json['map_show_discovery_contacts'] as bool? ?? true,
+      tcpServerAddress: json['tcp_server_address'] as String? ?? '',
+      tcpServerPort: json['tcp_server_port'] as int? ?? 0,
     );
   }
 
@@ -187,6 +195,8 @@ class AppSettings {
     UnitSystem? unitSystem,
     Set<String>? mutedChannels,
     bool? mapShowDiscoveryContacts,
+    String? tcpServerAddress,
+    int? tcpServerPort,
   }) {
     return AppSettings(
       clearPathOnMaxRetry: clearPathOnMaxRetry ?? this.clearPathOnMaxRetry,
@@ -225,6 +235,8 @@ class AppSettings {
       mutedChannels: mutedChannels ?? this.mutedChannels,
       mapShowDiscoveryContacts:
           mapShowDiscoveryContacts ?? this.mapShowDiscoveryContacts,
+      tcpServerAddress: tcpServerAddress ?? this.tcpServerAddress,
+      tcpServerPort: tcpServerPort ?? this.tcpServerPort,
     );
   }
 }

lib/models/contact.dart

@@ -65,7 +65,17 @@ class Contact {
     return '$pathLength hops';
   }
 
-  bool get hasLocation => latitude != null && longitude != null;
+  bool get hasLocation {
+    const double epsilon = 1e-6;
+    final lat = latitude ?? 0.0;
+    final lon = longitude ?? 0.0;
+    return (lat.abs() > epsilon || lon.abs() > epsilon) &&
+        lat >= -90.0 &&
+        lat <= 90.0 &&
+        lon >= -180.0 &&
+        lon <= 180.0;
+  }
+
   bool get isFavorite => (flags & contactFlagFavorite) != 0;
 
   Contact copyWith({
@@ -108,7 +118,7 @@ class Contact {
   }
 
   String get pathIdList {
-    final pathBytes = _pathBytesForDisplay;
+    final pathBytes = pathBytesForDisplay;
     if (pathBytes.isEmpty) return '';
     final parts = <String>[];
     final groupSize = pathHashSize;
@@ -130,43 +140,7 @@ class Contact {
     return "<${publicKeyHex.substring(0, 8)}...${publicKeyHex.substring(publicKeyHex.length - 8)}>";
   }
 
-  Uint8List? get traceRouteBytes {
-    final pathBytes = _pathBytesForDisplay;
-    Uint8List? traceBytes;
-
-    if (pathBytes.isEmpty) {
-      traceBytes = Uint8List(1);
-      traceBytes[0] = publicKey[0];
-      return traceBytes;
-    }
-
-    if (type == advTypeRepeater || type == advTypeRoom) {
-      final len = (pathBytes.length + pathBytes.length + 1);
-      traceBytes = Uint8List(len);
-      traceBytes[pathBytes.length] = publicKey[0];
-      for (int i = 0; i < pathBytes.length; i++) {
-        traceBytes[i] = pathBytes[i];
-        if (i < pathBytes.length) {
-          traceBytes[len - 1 - i] = pathBytes[i];
-        }
-      }
-    } else {
-      if (pathBytes.length < 2) {
-        return pathBytes[0] == 0 ? null : pathBytes;
-      }
-      final len = (pathBytes.length + pathBytes.length - 1);
-      traceBytes = Uint8List(len);
-      for (int i = 0; i < pathBytes.length; i++) {
-        traceBytes[i] = pathBytes[i];
-        if (i < pathBytes.length - 1) {
-          traceBytes[len - 1 - i] = pathBytes[i];
-        }
-      }
-    }
-    return traceBytes;
-  }
-
-  Uint8List get _pathBytesForDisplay {
+  Uint8List get pathBytesForDisplay {
     if (pathOverride != null) {
       if (pathOverride! < 0) return Uint8List(0);
       return pathOverrideBytes ?? Uint8List(0);
@@ -197,6 +171,7 @@ class Contact {
       double? lat, lon;
       final latRaw = reader.readInt32LE();
       final lonRaw = reader.readInt32LE();
+
       if (latRaw != 0 || lonRaw != 0) {
         lat = latRaw / 1e6;
         lon = lonRaw / 1e6;

lib/screens/channel_message_path_screen.dart

@@ -40,10 +40,7 @@ class ChannelMessagePathScreen extends StatelessWidget {
         final primaryPath = !channelMessage && !message.isOutgoing
             ? Uint8List.fromList(primaryPathTmp.reversed.toList())
             : primaryPathTmp;
-        final contacts = <Contact>[
-          ...connector.contacts,
-          ...connector.discoveredContacts,
-        ];
+        final contacts = connector.allContacts;
         final hops = _buildPathHops(primaryPath, contacts, l10n);
         final hasHopDetails = primaryPath.isNotEmpty;
         final observedLabel = _formatObservedHops(
@@ -65,8 +62,9 @@ class ChannelMessagePathScreen extends StatelessWidget {
                     builder: (context) => PathTraceMapScreen(
                       title: context.l10n.contacts_repeaterPathTrace,
                       path: primaryPath,
-                      flipPathRound: true,
-                      reversePathRound: !message.isOutgoing && !channelMessage,
+                      flipPathAround: true,
+                      reversePathAround:
+                          !(!channelMessage && !message.isOutgoing),
                     ),
                   ),
                 ),
@@ -367,10 +365,7 @@ class _ChannelMessagePathMapScreenState
             : selectedPathTmp;
 
         final selectedIndex = _indexForPath(selectedPath, observedPaths);
-        final contacts = <Contact>[
-          ...connector.contacts,
-          ...connector.discoveredContacts,
-        ];
+        final contacts = connector.allContacts;
         final hops = _buildPathHops(selectedPath, contacts, context.l10n);
 
         final points = <LatLng>[];

lib/screens/chat_screen.dart

@@ -106,10 +106,9 @@ class _ChatScreenState extends State<ChatScreen> {
             final unreadLabel = context.l10n.chat_unread(unreadCount);
             final pathLabel = _currentPathLabel(contact);
 
-            // Show path details if we have path data (from device or override)
-            final hasPathData =
-                contact.path.isNotEmpty || contact.pathOverrideBytes != null;
+            // Show path details if we have non-empty path data (from device or override)
             final effectivePath = contact.pathOverrideBytes ?? contact.path;
+            final hasPathData = effectivePath.isNotEmpty;
 
             return Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -143,12 +142,25 @@ class _ChatScreenState extends State<ChatScreen> {
               final contact = _resolveContact(connector);
               final isFloodMode = contact.pathOverride == -1;
 
+              final isDirectMode = contact.pathOverride == 0;
+              final activeMode = isFloodMode
+                  ? 'flood'
+                  : isDirectMode
+                  ? 'direct'
+                  : 'auto';
+
               return PopupMenuButton<String>(
                 icon: Icon(isFloodMode ? Icons.waves : Icons.route),
                 tooltip: context.l10n.chat_routingMode,
                 onSelected: (mode) async {
                   if (mode == 'flood') {
                     await connector.setPathOverride(contact, pathLen: -1);
+                  } else if (mode == 'direct') {
+                    await connector.setPathOverride(
+                      contact,
+                      pathLen: 0,
+                      pathBytes: Uint8List(0),
+                    );
                   } else {
                     await connector.setPathOverride(contact, pathLen: null);
                   }
@@ -161,7 +173,7 @@ class _ChatScreenState extends State<ChatScreen> {
                         Icon(
                           Icons.auto_mode,
                           size: 20,
-                          color: !isFloodMode
+                          color: activeMode == 'auto'
                               ? Theme.of(context).primaryColor
                               : null,
                         ),
@@ -169,7 +181,30 @@ class _ChatScreenState extends State<ChatScreen> {
                         Text(
                           context.l10n.chat_autoUseSavedPath,
                           style: TextStyle(
-                            fontWeight: !isFloodMode
+                            fontWeight: activeMode == 'auto'
+                                ? FontWeight.bold
+                                : FontWeight.normal,
+                          ),
+                        ),
+                      ],
+                    ),
+                  ),
+                  PopupMenuItem(
+                    value: 'direct',
+                    child: Row(
+                      children: [
+                        Icon(
+                          Icons.near_me,
+                          size: 20,
+                          color: activeMode == 'direct'
+                              ? Theme.of(context).primaryColor
+                              : null,
+                        ),
+                        const SizedBox(width: 8),
+                        Text(
+                          context.l10n.chat_direct,
+                          style: TextStyle(
+                            fontWeight: activeMode == 'direct'
                                 ? FontWeight.bold
                                 : FontWeight.normal,
                           ),
@@ -184,7 +219,7 @@ class _ChatScreenState extends State<ChatScreen> {
                         Icon(
                           Icons.waves,
                           size: 20,
-                          color: isFloodMode
+                          color: activeMode == 'flood'
                               ? Theme.of(context).primaryColor
                               : null,
                         ),
@@ -192,7 +227,7 @@ class _ChatScreenState extends State<ChatScreen> {
                         Text(
                           context.l10n.chat_forceFloodMode,
                           style: TextStyle(
-                            fontWeight: isFloodMode
+                            fontWeight: activeMode == 'flood'
                                 ? FontWeight.bold
                                 : FontWeight.normal,
                           ),
@@ -251,7 +286,9 @@ class _ChatScreenState extends State<ChatScreen> {
           ),
           const SizedBox(height: 8),
           Text(
-            context.l10n.chat_sendMessageTo(widget.contact.name),
+            context.l10n.chat_sendMessageTo(
+              _resolveContact(context.read<MeshCoreConnector>()).name,
+            ),
             style: TextStyle(fontSize: 14, color: Colors.grey[500]),
           ),
         ],
@@ -269,6 +306,7 @@ class _ChatScreenState extends State<ChatScreen> {
 
     // Auto-scroll to bottom if user is already at bottom
     WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (!mounted) return;
       _scrollController.scrollToBottomIfAtBottom();
     });
 
@@ -293,10 +331,10 @@ class _ChatScreenState extends State<ChatScreen> {
             );
           }
           final messageIndex = index;
-          Contact contact = widget.contact;
+          Contact contact = _resolveContact(connector);
           final message = reversedMessages[messageIndex];
           String fourByteHex = '';
-          if (widget.contact.type == advTypeRoom) {
+          if (contact.type == advTypeRoom) {
             contact = _resolveContactFrom4Bytes(
               connector,
               message.fourByteRoomContactKey.isEmpty
@@ -314,12 +352,13 @@ class _ChatScreenState extends State<ChatScreen> {
               final textScale = context.select<ChatTextScaleService, double>(
                 (service) => service.scale,
               );
+              final resolvedContact = _resolveContact(connector);
               return _MessageBubble(
                 message: message,
-                senderName: widget.contact.type == advTypeRoom
+                senderName: resolvedContact.type == advTypeRoom
                     ? "${contact.name} [$fourByteHex]"
                     : contact.name,
-                isRoomServer: widget.contact.type == advTypeRoom,
+                isRoomServer: resolvedContact.type == advTypeRoom,
                 textScale: textScale,
                 onTap: () => _openMessagePath(message, contact),
                 onLongPress: () => _showMessageActions(message, contact),
@@ -457,7 +496,7 @@ class _ChatScreenState extends State<ChatScreen> {
       return;
     }
 
-    connector.sendMessage(widget.contact, text);
+    connector.sendMessage(_resolveContact(connector), text);
     _textController.clear();
     _textFieldFocusNode.requestFocus();
   }
@@ -654,7 +693,7 @@ class _ChatScreenState extends State<ChatScreen> {
 
                                 // Set the path override to persist user's choice
                                 await connector.setPathOverride(
-                                  widget.contact,
+                                  _resolveContact(connector),
                                   pathLen: pathLength,
                                   pathBytes: pathBytes,
                                 );
@@ -663,7 +702,7 @@ class _ChatScreenState extends State<ChatScreen> {
                                 Navigator.pop(context);
                                 await _notifyPathSet(
                                   connector,
-                                  widget.contact,
+                                  _resolveContact(connector),
                                   pathBytes,
                                   path.hopCount,
                                 );
@@ -722,7 +761,9 @@ class _ChatScreenState extends State<ChatScreen> {
                         style: const TextStyle(fontSize: 11),
                       ),
                       onTap: () async {
-                        await connector.clearContactPath(widget.contact);
+                        await connector.clearContactPath(
+                          _resolveContact(connector),
+                        );
                         if (!context.mounted) return;
                         ScaffoldMessenger.of(context).showSnackBar(
                           SnackBar(
@@ -750,7 +791,7 @@ class _ChatScreenState extends State<ChatScreen> {
                       ),
                       onTap: () async {
                         await connector.setPathOverride(
-                          widget.contact,
+                          _resolveContact(connector),
                           pathLen: -1,
                         );
                         if (!context.mounted) return;
@@ -817,7 +858,7 @@ class _ChatScreenState extends State<ChatScreen> {
                 builder: (context) => PathTraceMapScreen(
                   title: context.l10n.contacts_repeaterPathTrace,
                   path: Uint8List.fromList(pathBytes),
-                  flipPathRound: true,
+                  flipPathAround: true,
                   targetContact: widget.contact,
                 ),
               ),
@@ -986,7 +1027,7 @@ class _ChatScreenState extends State<ChatScreen> {
     final currentPathLabel = _currentPathLabel(currentContact);
 
     // Filter out the current contact from available contacts
-    final availableContacts = connector.contacts
+    final availableContacts = connector.allContacts
         .where((c) => c != widget.contact)
         .toList();
 
@@ -1005,11 +1046,7 @@ class _ChatScreenState extends State<ChatScreen> {
     );
 
     if (result == null) {
-      appLogger.info(
-        'PathSelectionDialog was cancelled or returned null',
-        tag: 'ChatScreen',
-      );
-      return;
+      return; // Cancelled — keep existing path
     }
 
     if (!mounted) {
@@ -1025,14 +1062,19 @@ class _ChatScreenState extends State<ChatScreen> {
       tag: 'ChatScreen',
     );
     await connector.setPathOverride(
-      widget.contact,
+      _resolveContact(connector),
       pathLen: result.length,
       pathBytes: result,
     );
     appLogger.info('setPathOverride completed', tag: 'ChatScreen');
 
     if (!mounted) return;
-    await _notifyPathSet(connector, widget.contact, result, result.length);
+    await _notifyPathSet(
+      connector,
+      _resolveContact(connector),
+      result,
+      result.length,
+    );
   }
 
   void _openMessagePath(Message message, Contact contact) {
@@ -1044,10 +1086,10 @@ class _ChatScreenState extends State<ChatScreen> {
     final String senderName;
     if (message.isOutgoing) {
       senderName = connector.selfName ?? context.l10n.chat_me;
-    } else if (widget.contact.type == advTypeRoom) {
+    } else if (_resolveContact(connector).type == advTypeRoom) {
       senderName = "${contact.name} [$fourByteHex]";
     } else {
-      senderName = widget.contact.name;
+      senderName = _resolveContact(connector).name;
     }
     final pathMessage = ChannelMessage(
       senderKey: null,
@@ -1110,7 +1152,8 @@ class _ChatScreenState extends State<ChatScreen> {
                   _retryMessage(message);
                 },
               ),
-            if (widget.contact.type == advTypeRoom)
+            if (_resolveContact(context.read<MeshCoreConnector>()).type ==
+                advTypeRoom)
               ListTile(
                 leading: const Icon(Icons.chat),
                 title: Text(context.l10n.contacts_openChat),
@@ -1148,7 +1191,7 @@ class _ChatScreenState extends State<ChatScreen> {
   void _retryMessage(Message message) {
     final connector = Provider.of<MeshCoreConnector>(context, listen: false);
     // Retry using the contact's current path override setting
-    connector.sendMessage(widget.contact, message.text);
+    connector.sendMessage(_resolveContact(connector), message.text);
     ScaffoldMessenger.of(
       context,
     ).showSnackBar(SnackBar(content: Text(context.l10n.chat_retryingMessage)));
@@ -1174,7 +1217,8 @@ class _ChatScreenState extends State<ChatScreen> {
 
     // For room servers, include sender name (like channels) since multiple users
     // For 1:1 chats, sender is implicit (null)
-    final senderName = widget.contact.type == advTypeRoom
+    final liveContact = _resolveContact(connector);
+    final senderName = liveContact.type == advTypeRoom
         ? senderContact.name
         : null;
     final hash = ReactionHelper.computeReactionHash(
@@ -1183,7 +1227,7 @@ class _ChatScreenState extends State<ChatScreen> {
       message.text,
     );
     final reactionText = 'r:$hash:$emojiIndex';
-    connector.sendMessage(widget.contact, reactionText);
+    connector.sendMessage(_resolveContact(connector), reactionText);
   }
 }
 

lib/screens/contacts_screen.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:meshcore_open/screens/path_trace_map.dart';
+import 'package:meshcore_open/services/notification_service.dart';
 import 'package:meshcore_open/utils/app_logger.dart';
 import 'package:meshcore_open/widgets/app_bar.dart';
 import 'package:provider/provider.dart';
@@ -64,6 +65,13 @@ class _ContactsScreenState extends State<ContactsScreen>
     super.initState();
     _loadGroups();
     _setupFrameListener();
+    _clearAdvertNotifications();
+  }
+
+  void _clearAdvertNotifications() {
+    final connector = context.read<MeshCoreConnector>();
+    final contactIds = connector.contacts.map((c) => c.publicKeyHex).toList();
+    NotificationService().clearAdvertNotifications(contactIds);
   }
 
   @override
@@ -1056,7 +1064,7 @@ class _ContactsScreenState extends State<ContactsScreen>
             if (isRepeater) ...[
               ListTile(
                 leading: const Icon(Icons.radar, color: Colors.green),
-                title: contact.pathLength > 0
+                title: contact.pathBytesForDisplay.isNotEmpty
                     ? Text(context.l10n.contacts_pathTrace)
                     : Text(context.l10n.contacts_ping),
                 onTap: () {
@@ -1064,10 +1072,12 @@ class _ContactsScreenState extends State<ContactsScreen>
                     context,
                     MaterialPageRoute(
                       builder: (context) => PathTraceMapScreen(
-                        title: contact.pathLength > 0
+                        title: contact.pathBytesForDisplay.isNotEmpty
                             ? context.l10n.contacts_repeaterPathTrace
                             : context.l10n.contacts_repeaterPing,
-                        path: contact.traceRouteBytes ?? Uint8List(0),
+                        path: contact.pathBytesForDisplay,
+                        flipPathAround: true,
+                        targetContact: contact,
                       ),
                     ),
                   );
@@ -1092,10 +1102,12 @@ class _ContactsScreenState extends State<ContactsScreen>
                     context,
                     MaterialPageRoute(
                       builder: (context) => PathTraceMapScreen(
-                        title: contact.pathLength > 0
+                        title: contact.pathBytesForDisplay.isNotEmpty
                             ? context.l10n.contacts_roomPathTrace
                             : context.l10n.contacts_roomPing,
-                        path: contact.traceRouteBytes ?? Uint8List(0),
+                        path: contact.pathBytesForDisplay,
+                        flipPathAround: contact.pathBytesForDisplay.isNotEmpty,
+                        targetContact: contact,
                       ),
                     ),
                   );
@@ -1137,7 +1149,8 @@ class _ContactsScreenState extends State<ContactsScreen>
                           title: context.l10n.contacts_pathTraceTo(
                             contact.name,
                           ),
-                          path: contact.traceRouteBytes ?? Uint8List(0),
+                          path: contact.pathBytesForDisplay,
+                          flipPathAround: true,
                           targetContact: contact,
                         ),
                       ),

lib/screens/map_screen.dart

@@ -137,10 +137,7 @@ class _MapScreenState extends State<MapScreen> {
       builder: (context, connector, settingsService, pathHistory, child) {
         final tileCache = context.read<MapTileCacheService>();
         final settings = settingsService.settings;
-        final allContacts = <Contact>[
-          ...connector.contacts,
-          ...connector.discoveredContacts.where((c) => !c.isActive),
-        ];
+        final allContacts = connector.allContacts;
 
         final contacts = settings.mapShowDiscoveryContacts
             ? allContacts
@@ -179,20 +176,13 @@ class _MapScreenState extends State<MapScreen> {
 
         // Filter by location
         final contactsWithLocation = filteredByKeyPrefix.where((c) {
-          if (!c.hasLocation) {
-            return false;
-          }
-          return _checkLocationPlausibility(c.latitude!, c.longitude!);
+          return c.hasLocation;
         }).toList();
 
         // All contacts with a known location — used as anchors regardless of
         // time/key-prefix filters so that repeaters are always available.
         final allContactsWithLocation = allContacts
-            .where(
-              (c) =>
-                  c.hasLocation &&
-                  _checkLocationPlausibility(c.latitude!, c.longitude!),
-            )
+            .where((c) => c.hasLocation)
             .toList();
 
         // Compute guessed locations with caching
@@ -1509,6 +1499,23 @@ class _MapScreenState extends State<MapScreen> {
                 );
               },
             ),
+            ListTile(
+              leading: const Icon(Icons.my_location),
+              title: Text(context.l10n.map_setAsMyLocation),
+              onTap: () async {
+                final messenger = ScaffoldMessenger.of(context);
+                final successMsg = context.l10n.settings_locationUpdated;
+                Navigator.pop(sheetContext);
+                if (!connector.isConnected) return;
+                await connector.setNodeLocation(
+                  lat: position.latitude,
+                  lon: position.longitude,
+                );
+                await connector.refreshDeviceInfo();
+                if (!mounted) return;
+                messenger.showSnackBar(SnackBar(content: Text(successMsg)));
+              },
+            ),
             ListTile(
               leading: const Icon(Icons.close),
               title: Text(context.l10n.common_cancel),

lib/screens/neighbors_screen.dart

@@ -124,10 +124,7 @@ class _NeighborsScreenState extends State<NeighborsScreen> {
 
   void _handleNeighborsResponse(MeshCoreConnector connector, Uint8List frame) {
     final buffer = BufferReader(frame);
-    final contacts = <Contact>[
-      ...connector.contacts,
-      ...connector.discoveredContacts,
-    ];
+    final contacts = connector.allContacts;
     try {
       final neighborCount = buffer.readUInt16LE();
       final parsedNeighbors = parseNeighborsData(buffer, buffer.readUInt16LE());

lib/screens/path_trace_map.dart

@@ -52,8 +52,8 @@ class PathTraceMapScreen extends StatefulWidget {
   final String title;
   final Uint8List path;
   final int? repeaterId;
-  final bool flipPathRound;
-  final bool reversePathRound;
+  final bool flipPathAround;
+  final bool reversePathAround;
   final Contact? targetContact;
 
   const PathTraceMapScreen({
@@ -61,8 +61,8 @@ class PathTraceMapScreen extends StatefulWidget {
     required this.title,
     required this.path,
     this.repeaterId,
-    this.flipPathRound = false,
-    this.reversePathRound = false,
+    this.flipPathAround = false,
+    this.reversePathAround = false,
     this.targetContact,
   });
 
@@ -93,6 +93,7 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
   ValueKey<String> _mapKey = const ValueKey('initial');
   double _pathDistanceMeters = 0.0;
   bool _showNodeLabels = true;
+  Contact? _targetContact;
 
   String _formatPathPrefixes(Uint8List pathBytes) {
     return pathBytes
@@ -158,21 +159,16 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
       });
     }
 
-    final Uint8List path;
-
-    Uint8List pathTmp = widget.reversePathRound
+    final pathTmp = widget.reversePathAround
         ? Uint8List.fromList(widget.path.reversed.toList())
         : widget.path;
 
-    if (widget.flipPathRound) {
-      path = buildPath(pathTmp);
-    } else {
-      path = pathTmp;
-    }
+    final path = widget.flipPathAround ? buildPath(pathTmp) : pathTmp;
 
     appLogger.info(
       'Initiating path trace with path: ${_formatPathPrefixes(path)}',
       tag: 'PathTraceMapScreen',
+      noNotify: !mounted,
     );
 
     final connector = Provider.of<MeshCoreConnector>(context, listen: false);
@@ -263,10 +259,7 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
           .toList();
 
       Map<int, Contact> pathContacts = {};
-      final contacts = <Contact>[
-        ...connector.contacts,
-        ...connector.discoveredContacts,
-      ];
+      final contacts = connector.allContacts;
       contacts.where((c) => c.type != advTypeChat).forEach((repeater) {
         for (var repeaterData in pathData) {
           if (listEquals(
@@ -312,18 +305,21 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
         // Compute endpoint position for the target contact.
         LatLng? targetPos;
         bool targetGuessed = false;
-        final target = widget.targetContact;
-        if (target != null) {
-          if (target.hasLocation) {
-            targetPos = LatLng(target.latitude!, target.longitude!);
-          } else if (pathData.isNotEmpty) {
+        _targetContact = widget.targetContact;
+
+        if (_targetContact != null) {
+          final tc = _targetContact!;
+          if (tc.hasLocation) {
+            targetPos = LatLng(tc.latitude!, tc.longitude!);
+          } else if (widget.path.length > 1) {
             // Infer from the last hop: average GPS contacts sharing that hop.
-            // For a round-trip path (flipPathRound), the target-side hop sits
-            // in the middle of the symmetric sequence; .last is the local side.
-            final lastHop = (widget.flipPathRound && pathData.length > 1)
-                ? pathData[(pathData.length - 1) ~/ 2]
-                : pathData.last;
-            final peers = connector.contacts
+            // For a round-trip path (flipPathAround/reversePathAround), the target-side hop
+            // sits in the middle of the symmetric sequence; .last is the local side.
+            final lastHop = widget.reversePathAround
+                ? widget.path.first
+                : widget.path.last;
+
+            final peers = connector.allContacts
                 .where(
                   (c) =>
                       c.hasLocation &&
@@ -339,12 +335,34 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
                   peers.map((c) => c.longitude!).reduce((a, b) => a + b) /
                   peers.length;
               const offsetDeg = 0.003;
-              final angle = (target.publicKey[1] / 255.0) * 2 * pi;
+              final angle = (tc.publicKey[1] / 255.0) * 2 * pi;
               targetPos = LatLng(
                 lat + offsetDeg * cos(angle),
                 lon + offsetDeg * sin(angle),
               );
               targetGuessed = true;
+            } else if (inferredPositions.containsKey(lastHop)) {
+              final lat = inferredPositions[lastHop]!.latitude;
+              final lon = inferredPositions[lastHop]!.longitude;
+              const offsetDeg = 0.003;
+              final angle = (tc.publicKey[1] / 255.0) * 2 * pi;
+              targetPos = LatLng(
+                lat + offsetDeg * cos(angle),
+                lon + offsetDeg * sin(angle),
+              );
+              targetGuessed = true;
+            } else {
+              // As a last resort, just place it at the same position as the last hop.
+              final contact = pathContacts[lastHop];
+              if (contact != null && contact.hasLocation) {
+                const offsetDeg = 0.003;
+                final angle = (tc.publicKey[1] / 255.0) * 2 * pi;
+                targetPos = LatLng(
+                  contact.latitude! + offsetDeg * cos(angle),
+                  contact.longitude! + offsetDeg * sin(angle),
+                );
+                targetGuessed = true;
+              }
             }
           }
         }
@@ -353,7 +371,12 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
 
         _points = <LatLng>[];
         _points.add(LatLng(connector.selfLatitude!, connector.selfLongitude!));
+        int hopLast = 0;
+        int hopLastLast = 0;
         for (final hop in _traceData!.pathData) {
+          if (hop == hopLastLast && widget.flipPathAround) {
+            break; //skip duplicate hops in round-trip paths
+          }
           final contact = _traceData!.pathContacts[hop];
           if (contact != null && contact.hasLocation) {
             _points.add(LatLng(contact.latitude!, contact.longitude!));
@@ -361,8 +384,14 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
             final inferred = inferredPositions[hop];
             if (inferred != null) _points.add(inferred);
           }
+          hopLastLast = hopLast;
+          hopLast = hop;
+        }
+        if (targetPos != null) {
+          if (_targetContact != null && _targetContact!.type == advTypeChat) {
+            _points.add(targetPos);
+          }
         }
-        if (targetPos != null) _points.add(targetPos);
         _polylines = _points.length > 1
             ? [
                 Polyline(
@@ -451,7 +480,8 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
                       ],
                     ),
                   ),
-                if (_hasData) _buildMapPathTrace(context, tileCache),
+                if (_hasData)
+                  _buildMapPathTrace(context, tileCache, _targetContact),
                 if (_points.isEmpty &&
                     !_hasData &&
                     !_isLoading &&
@@ -480,17 +510,28 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
   List<Marker> _buildHopMarkers(
     List<int> pathData, {
     required bool showLabels,
+    required Contact? target,
   }) {
     final markers = <Marker>[];
+    int hopLast = 0;
+    int hopLastLast = 0;
     for (final hop in pathData) {
       final contact = _traceData!.pathContacts[hop];
       final inferred = _inferredHopPositions[hop];
       final hasGps = contact != null && contact.hasLocation;
-      if (!hasGps && inferred == null) continue;
+      if (hop == hopLastLast && widget.flipPathAround) {
+        continue; //skip duplicate hops in round-trip paths
+      }
+      if (!hasGps && inferred == null) {
+        hopLastLast = hopLast;
+        hopLast = hop;
+        continue; //skip hops with no GPS and no inferred position
+      }
       final point = hasGps
           ? LatLng(contact.latitude!, contact.longitude!)
           : inferred!;
       final label = hop.toRadixString(16).padLeft(2, '0').toUpperCase();
+
       markers.add(
         Marker(
           point: point,
@@ -532,6 +573,8 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
           ),
         );
       }
+      hopLastLast = hopLast;
+      hopLast = hop;
     }
 
     final selfLat = context.read<MeshCoreConnector>().selfLatitude;
@@ -581,9 +624,9 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
 
     // Add target contact endpoint marker.
     final targetPos = _targetContactPosition;
-    if (targetPos != null) {
+    if (targetPos != null && target != null && target.type == advTypeChat) {
       final isGuessed = _targetContactIsGuessed;
-      final targetName = widget.targetContact?.name ?? '?';
+      final targetName = target.name;
       markers.add(
         Marker(
           point: targetPos,
@@ -719,6 +762,7 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
   Widget _buildMapPathTrace(
     BuildContext context,
     MapTileCacheService tileCache,
+    Contact? target,
   ) {
     return FlutterMap(
       key: _mapKey,
@@ -757,6 +801,7 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
             markers: _buildHopMarkers(
               _traceData!.pathData,
               showLabels: _showNodeLabels,
+              target: target,
             ),
           ),
       ],

lib/screens/tcp_screen.dart

@@ -5,6 +5,7 @@ import 'package:provider/provider.dart';
 
 import '../connector/meshcore_connector.dart';
 import '../l10n/l10n.dart';
+import '../services/app_settings_service.dart';
 import '../utils/platform_info.dart';
 import '../widgets/adaptive_app_bar_title.dart';
 import 'contacts_screen.dart';
@@ -27,8 +28,14 @@ class _TcpScreenState extends State<TcpScreen> {
   @override
   void initState() {
     super.initState();
-    _hostController = TextEditingController();
-    _portController = TextEditingController(text: '5000');
+    _hostController = TextEditingController(
+      text: context.read<AppSettingsService>().settings.tcpServerAddress,
+    );
+    _portController = TextEditingController(
+      text: context.read<AppSettingsService>().settings.tcpServerPort > 0
+          ? context.read<AppSettingsService>().settings.tcpServerPort.toString()
+          : '',
+    );
     _connector = context.read<MeshCoreConnector>();
 
     _connectionListener = () {
@@ -39,6 +46,12 @@ class _TcpScreenState extends State<TcpScreen> {
       if (_connector.state == MeshCoreConnectionState.connected &&
           _connector.isTcpTransportConnected &&
           !_navigatedToContacts) {
+        context.read<AppSettingsService>().setTcpServerAddress(
+          _hostController.text,
+        );
+        context.read<AppSettingsService>().setTcpServerPort(
+          int.tryParse(_portController.text) ?? 0,
+        );
         _navigatedToContacts = true;
         Navigator.of(context).pushReplacement(
           MaterialPageRoute(builder: (_) => const ContactsScreen()),

lib/services/app_debug_log_service.dart

@@ -51,6 +51,7 @@ class AppDebugLogService extends ChangeNotifier {
     String message, {
     String tag = 'App',
     AppDebugLogLevel level = AppDebugLogLevel.info,
+    bool noNotify = false,
   }) {
     if (!_enabled && !kDebugMode) return;
     if (!_enabled) {
@@ -72,22 +73,24 @@ class AppDebugLogService extends ChangeNotifier {
       _entries.removeRange(0, _entries.length - maxEntries);
     }
 
-    notifyListeners();
+    if (!noNotify) {
+      notifyListeners();
+    }
 
     // Also print to console for development
     debugPrint('[$tag] $message');
   }
 
-  void info(String message, {String tag = 'App'}) {
-    log(message, tag: tag, level: AppDebugLogLevel.info);
+  void info(String message, {String tag = 'App', bool noNotify = false}) {
+    log(message, tag: tag, level: AppDebugLogLevel.info, noNotify: noNotify);
   }
 
-  void warn(String message, {String tag = 'App'}) {
-    log(message, tag: tag, level: AppDebugLogLevel.warning);
+  void warn(String message, {String tag = 'App', bool noNotify = false}) {
+    log(message, tag: tag, level: AppDebugLogLevel.warning, noNotify: noNotify);
   }
 
-  void error(String message, {String tag = 'App'}) {
-    log(message, tag: tag, level: AppDebugLogLevel.error);
+  void error(String message, {String tag = 'App', bool noNotify = false}) {
+    log(message, tag: tag, level: AppDebugLogLevel.error, noNotify: noNotify);
   }
 
   void clear() {

lib/services/app_settings_service.dart

@@ -182,4 +182,12 @@ class AppSettingsService extends ChangeNotifier {
       ..remove(channelName);
     await updateSettings(_settings.copyWith(mutedChannels: updated));
   }
+
+  Future<void> setTcpServerAddress(String value) async {
+    await updateSettings(_settings.copyWith(tcpServerAddress: value));
+  }
+
+  Future<void> setTcpServerPort(int value) async {
+    await updateSettings(_settings.copyWith(tcpServerPort: value));
+  }
 }

lib/services/message_retry_service.dart

@@ -44,6 +44,12 @@ class MessageRetryService extends ChangeNotifier {
       []; // Rolling buffer of recent ACK hashes
   final Map<String, List<String>> _pendingMessageQueuePerContact =
       {}; // contactPubKeyHex → FIFO queue of messageIds (DEPRECATED - will be removed)
+  final Map<String, List<String>> _sendQueue =
+      {}; // contactPubKeyHex → ordered list of messageIds awaiting send
+  final Set<String> _activeMessages =
+      {}; // messageIds currently in-flight (sent/retrying)
+  final Set<String> _resolvedMessages =
+      {}; // messageIds already resolved (prevents double _onMessageResolved)
   final Map<String, String> _expectedHashToMessageId =
       {}; // expectedAckHashHex → messageId (for matching RESP_CODE_SENT by hash)
 
@@ -156,7 +162,49 @@ class MessageRetryService extends ChangeNotifier {
       _addMessageCallback!(contact.publicKeyHex, message);
     }
 
-    await _attemptSend(messageId);
+    // Queue per contact — only one message in-flight at a time to avoid
+    // overflowing the firmware's 8-entry expected_ack_table.
+    final contactKey = contact.publicKeyHex;
+    _sendQueue[contactKey] ??= [];
+    _sendQueue[contactKey]!.add(messageId);
+
+    if (!_activeMessages.any(
+      (id) => _pendingContacts[id]?.publicKeyHex == contactKey,
+    )) {
+      _sendNextForContact(contactKey);
+    }
+  }
+
+  void _sendNextForContact(String contactKey) {
+    final queue = _sendQueue[contactKey];
+    if (queue == null) return;
+
+    // Drain stale entries iteratively instead of recursing.
+    while (queue.isNotEmpty) {
+      final messageId = queue.removeAt(0);
+      if (_pendingMessages.containsKey(messageId)) {
+        _activeMessages.add(messageId);
+        _attemptSend(messageId).catchError((e) {
+          debugPrint('_attemptSend threw for $messageId: $e');
+          final msg = _pendingMessages[messageId];
+          if (msg != null) {
+            final failed = msg.copyWith(status: MessageStatus.failed);
+            _pendingMessages[messageId] = failed;
+            _updateMessageCallback?.call(failed);
+          }
+          _onMessageResolved(messageId, contactKey);
+        });
+        return;
+      }
+      // Message was cancelled/cleaned up while queued — try next
+    }
+  }
+
+  void _onMessageResolved(String messageId, String contactKey) {
+    if (_resolvedMessages.contains(messageId)) return;
+    _resolvedMessages.add(messageId);
+    _activeMessages.remove(messageId);
+    _sendNextForContact(contactKey);
   }
 
   Future<void> _attemptSend(String messageId) async {
@@ -169,13 +217,11 @@ class MessageRetryService extends ChangeNotifier {
     // Use the path that was captured when the message was first sent
     if (_setContactPathCallback != null && _clearContactPathCallback != null) {
       if (message.pathLength != null && message.pathLength! < 0) {
-        // Flood mode - clear the path
         debugPrint(
           'Setting flood mode for retry attempt ${message.retryCount}',
         );
-        _clearContactPathCallback!(contact);
+        await _clearContactPathCallback!(contact);
       } else if (message.pathLength != null && message.pathLength! >= 0) {
-        // Specific path (including direct neighbor with pathLength=0)
         final pathStr = message.pathBytes.isEmpty
             ? 'direct'
             : message.pathBytes
@@ -192,6 +238,24 @@ class MessageRetryService extends ChangeNotifier {
       }
     }
 
+    // Re-validate after async gap — a timer or ACK could have resolved/retried
+    // this message while we were awaiting the path callback.
+    final currentMessage = _pendingMessages[messageId];
+    if (currentMessage == null || _resolvedMessages.contains(messageId)) {
+      debugPrint(
+        '_attemptSend: message $messageId resolved during path sync, aborting',
+      );
+      return;
+    }
+    // If the message was retried by a timer during our await, the retryCount
+    // will have advanced. Only proceed if it still matches the attempt we started.
+    if (currentMessage.retryCount != message.retryCount) {
+      debugPrint(
+        '_attemptSend: message $messageId retryCount changed during path sync, aborting',
+      );
+      return;
+    }
+
     final attempt = message.retryCount.clamp(0, 3);
     final timestampSeconds = message.timestamp.millisecondsSinceEpoch ~/ 1000;
 
@@ -231,6 +295,15 @@ class MessageRetryService extends ChangeNotifier {
 
     if (_sendMessageCallback != null) {
       _sendMessageCallback!(contact, message.text, attempt, timestampSeconds);
+    } else {
+      // No send callback — message would be stuck forever. Fail it immediately.
+      debugPrint(
+        '_attemptSend: no sendMessageCallback, failing message $messageId',
+      );
+      final failedMessage = message.copyWith(status: MessageStatus.failed);
+      _pendingMessages[messageId] = failedMessage;
+      _updateMessageCallback?.call(failedMessage);
+      _onMessageResolved(messageId, contact.publicKeyHex);
     }
   }
 
@@ -281,6 +354,7 @@ class MessageRetryService extends ChangeNotifier {
     }
 
     // FALLBACK: Old queue-based matching (for messages sent before hash computation was added)
+    // Only match within a single contact's queue to avoid cross-contact mismatches.
     if (messageId == null && allowQueueFallback) {
       _debugLogService?.warn(
         'RESP_CODE_SENT: ACK hash $ackHashHex not found in hash table, falling back to queue',
@@ -290,13 +364,16 @@ class MessageRetryService extends ChangeNotifier {
         'Hash-based match failed for $ackHashHex, falling back to queue-based matching',
       );
 
-      for (var entry in _pendingMessageQueuePerContact.entries) {
+      // Search all contact queues so concurrent chats don't miss matches.
+      final queuesToSearch = _pendingMessageQueuePerContact;
+
+      for (var entry in queuesToSearch.entries) {
         final contactKey = entry.key;
         final queue = entry.value;
 
-        if (queue.isNotEmpty) {
+        // Drain stale entries until we find a valid one or exhaust the queue.
+        while (queue.isNotEmpty) {
           final candidateMessageId = queue.removeAt(0);
-
           if (_pendingMessages.containsKey(candidateMessageId)) {
             messageId = candidateMessageId;
             contact = _pendingContacts[candidateMessageId];
@@ -304,21 +381,10 @@ class MessageRetryService extends ChangeNotifier {
               'Queue-based match (fallback): $ackHashHex → message $messageId for $contactKey',
             );
             break;
-          } else {
-            debugPrint('Dequeued stale message $candidateMessageId - skipping');
-            if (queue.isNotEmpty) {
-              final nextMessageId = queue.removeAt(0);
-              if (_pendingMessages.containsKey(nextMessageId)) {
-                messageId = nextMessageId;
-                contact = _pendingContacts[nextMessageId];
-                debugPrint(
-                  'Queue-based match (fallback): $ackHashHex → message $messageId',
-                );
-                break;
-              }
-            }
           }
+          debugPrint('Dequeued stale message $candidateMessageId - skipping');
         }
+        if (messageId != null) break;
       }
     }
 
@@ -463,22 +529,7 @@ class MessageRetryService extends ChangeNotifier {
     } else {
       // Max retries reached - mark as failed
       final failedMessage = message.copyWith(status: MessageStatus.failed);
-
-      // Move ACK hashes to history before removing
-      _moveAckHashesToHistory(messageId);
-
-      _pendingMessages.remove(messageId);
-      _pendingContacts.remove(messageId);
-      _pendingPathSelections.remove(messageId);
-      _timeoutTimers[messageId]?.cancel();
-      _timeoutTimers.remove(messageId);
-
-      // Clean up the queue entry for this contact
-      _pendingMessageQueuePerContact[contact.publicKeyHex]?.remove(messageId);
-      if (_pendingMessageQueuePerContact[contact.publicKeyHex]?.isEmpty ??
-          false) {
-        _pendingMessageQueuePerContact.remove(contact.publicKeyHex);
-      }
+      _pendingMessages[messageId] = failedMessage;
 
       // Check if we should clear the path on max retry
       if (_appSettingsService?.settings.clearPathOnMaxRetry == true &&
@@ -499,6 +550,30 @@ class MessageRetryService extends ChangeNotifier {
       }
 
       notifyListeners();
+
+      // Message is done retrying — send next queued message for this contact
+      _onMessageResolved(messageId, contact.publicKeyHex);
+
+      // Keep message in pending maps for 30s grace period so late ACKs
+      // can still match and update the message to delivered.
+      _timeoutTimers[messageId] = Timer(const Duration(seconds: 30), () {
+        _moveAckHashesToHistory(messageId);
+        // Clean up ALL hash mappings for this message
+        _ackHashToMessageId.removeWhere(
+          (_, mapping) => mapping.messageId == messageId,
+        );
+        _expectedHashToMessageId.removeWhere((_, msgId) => msgId == messageId);
+        _pendingMessages.remove(messageId);
+        _pendingContacts.remove(messageId);
+        _pendingPathSelections.remove(messageId);
+        _timeoutTimers.remove(messageId);
+        _resolvedMessages.remove(messageId);
+        final contactKey = contact.publicKeyHex;
+        _pendingMessageQueuePerContact[contactKey]?.remove(messageId);
+        if (_pendingMessageQueuePerContact[contactKey]?.isEmpty ?? false) {
+          _pendingMessageQueuePerContact.remove(contactKey);
+        }
+      });
     }
   }
 
@@ -594,7 +669,15 @@ class MessageRetryService extends ChangeNotifier {
     }
 
     if (matchedMessageId != null) {
-      final message = _pendingMessages[matchedMessageId]!;
+      final message = _pendingMessages[matchedMessageId];
+      if (message == null) {
+        // Message was already cleaned up (e.g. grace period expired)
+        _ackHashToMessageId.remove(ackHashHex);
+        debugPrint(
+          'ACK matched $matchedMessageId but message already cleaned up',
+        );
+        return;
+      }
       final contact = _pendingContacts[matchedMessageId];
       final selection = _pendingPathSelections[matchedMessageId];
 
@@ -616,12 +699,21 @@ class MessageRetryService extends ChangeNotifier {
         tripTimeMs: tripTimeMs,
       );
 
+      // Clean up ALL hash mappings for this message (from all retry attempts)
+      _ackHashToMessageId.removeWhere(
+        (_, mapping) => mapping.messageId == matchedMessageId,
+      );
+      _expectedHashToMessageId.removeWhere(
+        (_, msgId) => msgId == matchedMessageId,
+      );
+
       // Move ACK hashes to history before removing
       _moveAckHashesToHistory(matchedMessageId);
 
       _pendingMessages.remove(matchedMessageId);
       _pendingContacts.remove(matchedMessageId);
       _pendingPathSelections.remove(matchedMessageId);
+      _resolvedMessages.remove(matchedMessageId);
 
       // Clean up the queue entry for this contact (remove any remaining references to this message)
       if (contact != null) {
@@ -646,6 +738,7 @@ class MessageRetryService extends ChangeNotifier {
           true,
           tripTimeMs,
         );
+        _onMessageResolved(matchedMessageId, contact.publicKeyHex);
       }
 
       notifyListeners();
@@ -783,6 +876,9 @@ class MessageRetryService extends ChangeNotifier {
     _ackHistory.clear();
     _ackHashToMessageId.clear();
     _pendingMessageQueuePerContact.clear();
+    _sendQueue.clear();
+    _activeMessages.clear();
+    _resolvedMessages.clear();
     super.dispose();
   }
 }

lib/services/notification_service.dart

@@ -232,7 +232,9 @@ class NotificationService {
 
     try {
       await _notifications.show(
-        id: contactId?.hashCode ?? DateTime.now().millisecondsSinceEpoch,
+        id: contactId != null
+            ? 'advert:$contactId'.hashCode
+            : DateTime.now().millisecondsSinceEpoch,
         title: _l10n.notification_newTypeDiscovered(contactType),
         body: contactName,
         notificationDetails: notificationDetails,
@@ -331,6 +333,61 @@ class NotificationService {
     await _notifications.cancel(id: id);
   }
 
+  /// Cancel the notification for a specific contact and update the app badge.
+  Future<void> clearContactNotification(
+    String contactId,
+    int totalUnreadCount,
+  ) async {
+    if (!await _ensureInitialized()) return;
+    await _notifications.cancel(id: contactId.hashCode);
+    await _updateBadge(totalUnreadCount);
+  }
+
+  /// Cancel the notification for a specific channel and update the app badge.
+  Future<void> clearChannelNotification(
+    int channelIndex,
+    int totalUnreadCount,
+  ) async {
+    if (!await _ensureInitialized()) return;
+    await _notifications.cancel(id: channelIndex.hashCode);
+    await _updateBadge(totalUnreadCount);
+  }
+
+  /// Cancel advert notifications for the given contact public key hexes.
+  Future<void> clearAdvertNotifications(List<String> contactIds) async {
+    if (!await _ensureInitialized()) return;
+    for (final id in contactIds) {
+      await _notifications.cancel(id: 'advert:$id'.hashCode);
+    }
+  }
+
+  Future<void> _updateBadge(int count) async {
+    if (PlatformInfo.isIOS || PlatformInfo.isMacOS) {
+      // On Apple platforms, set the badge number directly via a silent update.
+      final darwinDetails = DarwinNotificationDetails(
+        presentAlert: false,
+        presentSound: false,
+        presentBadge: true,
+        badgeNumber: count,
+      );
+      final details = NotificationDetails(
+        iOS: darwinDetails,
+        macOS: darwinDetails,
+      );
+      // Use a fixed ID so each update replaces the previous one.
+      await _notifications.show(
+        id: 'badge_update'.hashCode,
+        title: null,
+        body: null,
+        notificationDetails: details,
+      );
+      // Immediately cancel the silent notification so it doesn't appear in tray.
+      await _notifications.cancel(id: 'badge_update'.hashCode);
+    }
+    // On Android, badge count is derived from active notifications,
+    // so cancelling the specific notification above is sufficient.
+  }
+
   // ─────────────────────────────────────────────────────────────────
   // Public notification methods (rate limiting is enforced automatically)
   // ─────────────────────────────────────────────────────────────────

lib/services/usb_serial_service_native.dart

@@ -189,6 +189,10 @@ class UsbSerialService {
           serial.setStopBits1();
           serial.setFlowControlNone();
           serial.setRTS(false);
+          // Toggle DTR low→high so the device sees a fresh connection even
+          // if the previous disconnect didn't cleanly signal DTR drop.
+          serial.setDTR(false);
+          await Future<void>.delayed(const Duration(milliseconds: 50));
           serial.setDTR(true);
           _serial = serial;
           // Update the normalized port name to whichever candidate succeeded.
@@ -249,6 +253,21 @@ class UsbSerialService {
     _status = UsbSerialStatus.connected;
   }
 
+  Future<void> writeRaw(Uint8List data) async {
+    if (!isConnected) {
+      throw StateError('USB serial port is not open');
+    }
+    if (_useAndroidUsbHost) {
+      try {
+        await _androidMethodChannel.invokeMethod<void>('write', {'data': data});
+      } on PlatformException catch (error) {
+        throw StateError(error.message ?? error.code);
+      }
+    } else {
+      _serial!.write(data);
+    }
+  }
+
   Future<void> write(Uint8List data) async {
     if (!isConnected) {
       throw StateError('USB serial port is not open');
@@ -300,6 +319,7 @@ class UsbSerialService {
       _serial = null;
       try {
         if (serial?.isOpen() == FlOpenStatus.open) {
+          serial?.setDTR(false);
           serial?.closePort();
         }
       } catch (_) {
@@ -350,6 +370,7 @@ class UsbSerialService {
       final serial = _serial;
       try {
         if (serial?.isOpen() == FlOpenStatus.open) {
+          serial?.setDTR(false);
           serial?.closePort(); // synchronous C call — kills the SerialThread
         }
       } catch (_) {}

lib/services/usb_serial_service_web.dart

@@ -127,6 +127,17 @@ class UsbSerialService {
     }
   }
 
+  Future<void> writeRaw(Uint8List data) async {
+    if (!isConnected || _writer == null) {
+      throw StateError('USB serial port is not open');
+    }
+    final promise = _writer!.callMethod<JSPromise<JSAny?>>(
+      'write'.toJS,
+      data.toJS,
+    );
+    await promise.toDart;
+  }
+
   Future<void> write(Uint8List data) async {
     if (!isConnected || _writer == null) {
       throw StateError('USB serial port is not open');

lib/utils/app_logger.dart

@@ -23,23 +23,23 @@ class AppLogger {
   bool get isEnabled => _enabled;
 
   /// Log an info message
-  void info(String message, {String tag = 'App'}) {
+  void info(String message, {String tag = 'App', bool noNotify = false}) {
     if (_enabled && _service != null) {
-      _service!.info(message, tag: tag);
+      _service!.info(message, tag: tag, noNotify: noNotify);
     }
   }
 
   /// Log a warning message
-  void warn(String message, {String tag = 'App'}) {
+  void warn(String message, {String tag = 'App', bool noNotify = false}) {
     if (_enabled && _service != null) {
-      _service!.warn(message, tag: tag);
+      _service!.warn(message, tag: tag, noNotify: noNotify);
     }
   }
 
   /// Log an error message
-  void error(String message, {String tag = 'App'}) {
+  void error(String message, {String tag = 'App', bool noNotify = false}) {
     if (_enabled && _service != null) {
-      _service!.error(message, tag: tag);
+      _service!.error(message, tag: tag, noNotify: noNotify);
     }
   }
 
@@ -48,9 +48,10 @@ class AppLogger {
     String message, {
     String tag = 'App',
     AppDebugLogLevel level = AppDebugLogLevel.info,
+    bool noNotify = false,
   }) {
     if (_enabled && _service != null) {
-      _service!.log(message, tag: tag, level: level);
+      _service!.log(message, tag: tag, level: level, noNotify: noNotify);
     }
   }
 }

lib/widgets/path_management_dialog.dart

@@ -78,7 +78,7 @@ class _PathManagementDialogState extends State<_PathManagementDialog> {
                 builder: (context) => PathTraceMapScreen(
                   title: context.l10n.contacts_repeaterPathTrace,
                   path: Uint8List.fromList(pathBytes),
-                  flipPathRound: true,
+                  flipPathAround: true,
                   targetContact: widget.contact,
                 ),
               ),
@@ -107,7 +107,7 @@ class _PathManagementDialogState extends State<_PathManagementDialog> {
     }
 
     final pathForInput = currentContact.pathIdList;
-    final availableContacts = connector.contacts
+    final availableContacts = connector.allContacts
         .where((c) => c.publicKeyHex != currentContact.publicKeyHex)
         .toList();
 

lib/widgets/path_selection_dialog.dart

@@ -1,5 +1,6 @@
 import 'dart:typed_data';
 import 'package:flutter/material.dart';
+import 'package:meshcore_open/connector/meshcore_protocol.dart';
 import '../l10n/l10n.dart';
 import '../models/contact.dart';
 
@@ -65,7 +66,7 @@ class _PathSelectionDialogState extends State<PathSelectionDialog> {
 
   void _filterValidContacts() {
     _validContacts = widget.availableContacts
-        .where((c) => c.type == 2 || c.type == 3)
+        .where((c) => c.type == advTypeRepeater || c.type == advTypeRoom)
         .toList();
   }
 

lib/widgets/snr_indicator.dart

@@ -157,10 +157,7 @@ class _SNRIndicatorState extends State<SNRIndicator> {
                   repeater.snr,
                   widget.connector.currentSf,
                 );
-                final allContacts = [
-                  ...widget.connector.contacts,
-                  ...widget.connector.discoveredContacts,
-                ];
+                final allContacts = widget.connector.allContacts;
                 final name = allContacts
                     .where((c) => c.publicKey.first == repeater.pubkeyFirstByte)
                     .map((c) => c.name)