wifi connection established by app, process socket binding, primary os connection untouched

app/lib/ui/providers/wifi_connection_provider.dart

@@ -15,6 +15,7 @@ final wifiTransportProvider = Provider<UdpTransport>((ref) {
   final transport = UdpTransport(
     getHost: settingsRepo.loadConnectionWifiHost,
     getPort: settingsRepo.loadConnectionWifiPort,
+    getSsidPrefix: settingsRepo.loadConnectionWifiSsidPrefix,
   );
   ref.onDispose(transport.dispose);
   return transport;
@@ -96,6 +97,7 @@ class WifiConnectionLogNotifier
   StreamSubscription<LinkState>? _stateSub;
   StreamSubscription<void>? _dataSub;
   int _packetCount = 0;
+  String? _lastLoggedPeer;
 
   int get packetCount => _packetCount;
 
@@ -105,8 +107,9 @@ class WifiConnectionLogNotifier
     _stateSub?.cancel();
     _dataSub?.cancel();
     _packetCount = 0;
+    _lastLoggedPeer = null;
     _stateSub = transport.state.listen(_onStateChanged);
-    _dataSub = transport.incoming.listen((_) => _packetCount++);
+    _dataSub = transport.incoming.listen((_) => _onPacket(transport));
     ref.onDispose(() {
       _stateSub?.cancel();
       _dataSub?.cancel();
@@ -114,18 +117,38 @@ class WifiConnectionLogNotifier
     return const [];
   }
 
+  void _onPacket(UdpTransport transport) {
+    _packetCount++;
+    // Gegenstelle wird aus dem ersten eingehenden Paket gelernt (Doku
+    // Kommunikationsschicht v2, Abschnitt 3/9) - nur beim ersten Mal bzw.
+    // bei Aenderung protokollieren, nicht pro Paket.
+    final peer = transport.peerDescription;
+    if (peer != null && peer != _lastLoggedPeer) {
+      _lastLoggedPeer = peer;
+      _append('Peer learned: $peer');
+    }
+  }
+
   void _onStateChanged(LinkState linkState) {
     final transport = ref.read(wifiTransportProvider);
     final message = switch (linkState) {
       LinkState.disconnected => 'Disconnected',
-      LinkState.connecting => 'Connecting...',
-      LinkState.connected => 'Listening on port ${transport.boundPort}',
+      LinkState.connecting => 'Requesting mLRS network...',
+      LinkState.connected =>
+        'Network available, listening on port ${transport.boundPort}'
+            ' (STA concurrency: ${_formatStaConcurrency(transport.staConcurrencySupported)})',
       LinkState.error => 'Error: '
           '${transport.lastErrorMessage ?? transport.lastErrorReason?.name ?? 'unknown'}',
     };
     _append(message);
   }
 
+  String _formatStaConcurrency(bool? supported) => switch (supported) {
+        true => 'supported',
+        false => 'not supported',
+        null => 'unknown',
+      };
+
   void _append(String message) {
     final entry = WifiConnectionLogEntry(DateTime.now(), message);
     final next = [...state, entry];

app/lib/ui/screens/settings/settings_screen.dart

@@ -121,6 +121,7 @@ class _WifiPanel extends ConsumerStatefulWidget {
 }
 
 class _WifiPanelState extends ConsumerState<_WifiPanel> {
+  late final TextEditingController _ssidPrefixController;
   late final TextEditingController _hostController;
   late final TextEditingController _portController;
   bool _controllersSeeded = false;
@@ -128,12 +129,14 @@ class _WifiPanelState extends ConsumerState<_WifiPanel> {
   @override
   void initState() {
     super.initState();
+    _ssidPrefixController = TextEditingController();
     _hostController = TextEditingController();
     _portController = TextEditingController();
   }
 
   @override
   void dispose() {
+    _ssidPrefixController.dispose();
     _hostController.dispose();
     _portController.dispose();
     super.dispose();
@@ -153,6 +156,7 @@ class _WifiPanelState extends ConsumerState<_WifiPanel> {
     // ueberschrieben.
     if (!_controllersSeeded && connectionSettings != null) {
       _controllersSeeded = true;
+      _ssidPrefixController.text = connectionSettings.connectionWifiSsidPrefix;
       _hostController.text = connectionSettings.connectionWifiHost ?? '';
       _portController.text = connectionSettings.connectionWifiPort.toString();
     }
@@ -171,9 +175,17 @@ class _WifiPanelState extends ConsumerState<_WifiPanel> {
         ),
         const SizedBox(height: 4),
         const Text(
-          'Opens a local UDP socket and listens for the mLRS bridge '
-          '(port 14550 by default). The peer address is learned from the '
-          'first incoming packet.',
+          'The app connects to the mLRS bridge WiFi itself (a system dialog '
+          'will ask you to confirm) so your normal mobile data connection '
+          'keeps working for maps and weather. The peer address is learned '
+          'from the first incoming packet.',
+          style: TextStyle(fontSize: 12, color: Colors.grey),
+        ),
+        const SizedBox(height: 4),
+        const Text(
+          'Do not manually connect to or save the mLRS network in your '
+          'system WiFi settings - that would make it the default route and '
+          'break maps/weather.',
           style: TextStyle(fontSize: 12, color: Colors.grey),
         ),
         if (errorReason != null) ...[
@@ -187,15 +199,15 @@ class _WifiPanelState extends ConsumerState<_WifiPanel> {
             Expanded(
               flex: 2,
               child: TextField(
-                controller: _hostController,
+                controller: _ssidPrefixController,
                 decoration: const InputDecoration(
-                  labelText: 'Host (optional)',
-                  hintText: 'auto (learned from traffic)',
+                  labelText: 'SSID prefix',
                   isDense: true,
                   border: OutlineInputBorder(),
                 ),
-                onSubmitted: (value) => _saveHost(value),
-                onEditingComplete: () => _saveHost(_hostController.text),
+                onSubmitted: (value) => _saveSsidPrefix(value),
+                onEditingComplete: () =>
+                    _saveSsidPrefix(_ssidPrefixController.text),
               ),
             ),
             const SizedBox(width: 8),
@@ -215,6 +227,18 @@ class _WifiPanelState extends ConsumerState<_WifiPanel> {
             ),
           ],
         ),
+        const SizedBox(height: 8),
+        TextField(
+          controller: _hostController,
+          decoration: const InputDecoration(
+            labelText: 'Host (optional)',
+            hintText: 'auto (network gateway, then learned from traffic)',
+            isDense: true,
+            border: OutlineInputBorder(),
+          ),
+          onSubmitted: (value) => _saveHost(value),
+          onEditingComplete: () => _saveHost(_hostController.text),
+        ),
         const SizedBox(height: 16),
         Row(
           children: [
@@ -258,6 +282,15 @@ class _WifiPanelState extends ConsumerState<_WifiPanel> {
     );
   }
 
+  Future<void> _saveSsidPrefix(String value) async {
+    final trimmed = value.trim();
+    if (trimmed.isEmpty) return;
+    await ref
+        .read(appSettingsRepositoryProvider)
+        .setConnectionWifiSsidPrefix(trimmed);
+    ref.invalidate(connectionSettingsProvider);
+  }
+
   Future<void> _saveHost(String value) async {
     final trimmed = value.trim();
     await ref
@@ -293,16 +326,25 @@ class _WifiErrorHint extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final text = switch (reason) {
+      LinkErrorReason.networkUnavailable =>
+        'No matching WiFi network found, or the system connection dialog '
+            'was dismissed. Make sure the mLRS bridge is powered on and not '
+            'saved/connected in system WiFi settings, then tap "Connect" '
+            'again.',
+      LinkErrorReason.networkLost =>
+        'The mLRS WiFi network was lost (out of range or bridge powered '
+            'off). Tap "Connect" to reconnect.',
+      LinkErrorReason.connectionFailed => 'Connection to the bridge failed.',
+      _ => 'Connection error: ${reason.name}.',
+    };
     return Container(
       padding: const EdgeInsets.all(8),
       decoration: BoxDecoration(
         color: DmcColors.warnRed.withValues(alpha: 0.1),
         borderRadius: BorderRadius.circular(8),
       ),
-      child: Text(
-        'Connection error: ${reason.name}.',
-        style: const TextStyle(fontSize: 12),
-      ),
+      child: Text(text, style: const TextStyle(fontSize: 12)),
     );
   }
 }
@@ -543,7 +585,13 @@ class _ErrorHint extends StatelessWidget {
           'Connection to the device failed.',
           null,
         ),
-      LinkErrorReason.unknown => ('Unknown connection error.', null),
+      // networkUnavailable/networkLost betreffen nur den WLAN-Transport
+      // (siehe _WifiErrorHint) - hier nur der Vollstaendigkeit halber, damit
+      // der gemeinsame LinkErrorReason-Enum exhaustiv bleibt.
+      LinkErrorReason.networkUnavailable ||
+      LinkErrorReason.networkLost ||
+      LinkErrorReason.unknown =>
+        ('Unknown connection error.', null),
     };
     return Container(
       padding: const EdgeInsets.all(8),