feat: show connection status detail in app bar during connect

Matthias Nott

2026-03-25 9aea0e7837ae0ea3d417f3d2afd8554cd71f123d

 lib/services/mqtt_service.dart
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@@ -56,6 +56,7 @@
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   // Callbacks
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   void Function(ConnectionStatus status)? onStatusChanged;
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+  void Function(String detail)? onStatusDetail; // "Probing local...", "Scanning network..."
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   void Function(Map<String, dynamic> message)? onMessage;
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   void Function()? onOpen;
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   void Function()? onClose;
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@@ -117,6 +118,7 @@
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     if (config.vpnHost != null && config.vpnHost!.isNotEmpty) hosts.add(config.vpnHost!);
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     if (config.host.isNotEmpty) hosts.add(config.host);
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     _mqttLog('MQTT: probing ${hosts.length} hosts in parallel: ${hosts.join(", ")}');
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+    onStatusDetail?.call('Probing ${hosts.length} hosts...');
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     // Probe all configured hosts in parallel — first to respond wins
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     String? winner;
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@@ -143,6 +145,7 @@
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     if (winner != null && !_intentionalClose) {
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       _mqttLog('MQTT: probe winner: $winner, connecting...');
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+      onStatusDetail?.call('Connecting to $winner...');
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       try {
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         if (await _tryConnect(winner, clientId, timeout: 5000)) return;
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       } catch (e) {
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@@ -152,6 +155,7 @@
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     // All hosts failed — retry after delay
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     _mqttLog('MQTT: all attempts failed, retrying in 5s');
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+    onStatusDetail?.call('No server found, retrying...');
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     _setStatus(ConnectionStatus.reconnecting);
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     Future.delayed(const Duration(seconds: 5), () {
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       if (!_intentionalClose && _status != ConnectionStatus.connected) {
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@@ -201,6 +205,7 @@
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     // Fallback: scan local subnet for MQTT port (handles Personal Hotspot)
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     _mqttLog('MQTT: Bonjour failed, trying subnet scan...');
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+    onStatusDetail?.call('Scanning local network...');
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     return _scanSubnetForMqtt();
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   }
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