GNSS eszközhöz való kapcsolódás és bluetooth kommunikáció refraktorálása külön osztályokba

2026-05-11 09:34:41 +02:00
parent 7192fa5322
commit f1a3753f36
6 changed files with 343 additions and 5 deletions
@@ -0,0 +1,94 @@
+// lib/services/gnss/bt_serial_gnss_connection.dart
+import 'dart:async';
+import 'dart:typed_data';
+import 'package:flutter_bluetooth_serial/flutter_bluetooth_serial.dart';
+import 'gnss_connection.dart';
+
+class BtSerialGnssConnection implements GnssConnection {
+  @override
+  GnssConnectionType get type => GnssConnectionType.btSerial;
+
+  BluetoothConnection? _connection;
+  String _messageBuffer = '';
+
+  final _nmeaController = StreamController<String>.broadcast();
+  final _stateController = StreamController<GnssConnectionState>.broadcast();
+
+  @override
+  Stream<String> get nmeaLines => _nmeaController.stream;
+
+  @override
+  Stream<GnssConnectionState> get connectionState => _stateController.stream;
+
+  @override
+  Future<void> connect(String address) async {
+    _stateController.add(GnssConnectionState.connecting);
+    try {
+      _connection = await BluetoothConnection.toAddress(address);
+      _stateController.add(GnssConnectionState.connected);
+      _connection!.input!.listen(
+        _onData,
+        onDone: () {
+          _stateController.add(GnssConnectionState.disconnected);
+        },
+      );
+    } catch (e) {
+      _stateController.add(GnssConnectionState.error);
+      rethrow;
+    }
+  }
+
+  @override
+  Future<void> disconnect() async {
+    await _connection?.close();
+    _connection = null;
+    _stateController.add(GnssConnectionState.disconnected);
+  }
+
+  // A meglévő _onDataReceived logika változatlanul
+  void _onData(Uint8List data) {
+    int backspacesCounter = 0;
+    for (var byte in data) {
+      if (byte == 8 || byte == 127) backspacesCounter++;
+    }
+
+    Uint8List buffer = Uint8List(data.length - backspacesCounter);
+    int bufferIndex = buffer.length;
+    backspacesCounter = 0;
+
+    for (int i = data.length - 1; i >= 0; i--) {
+      if (data[i] == 8 || data[i] == 127) {
+        backspacesCounter++;
+      } else if (backspacesCounter > 0) {
+        backspacesCounter--;
+      } else {
+        buffer[--bufferIndex] = data[i];
+      }
+    }
+
+    final dataString = String.fromCharCodes(buffer);
+    final index = buffer.indexOf(13); // \r
+
+    String sentence;
+    if (~index != 0) {
+      sentence = _messageBuffer + dataString.substring(0, index);
+      _messageBuffer = dataString.substring(index);
+    } else {
+      _messageBuffer += dataString;
+      return;
+    }
+
+    // Soronként kibocsátjuk
+    for (final line in sentence.split('\n')) {
+      final trimmed = line.trim();
+      if (trimmed.isNotEmpty) _nmeaController.add(trimmed);
+    }
+  }
+
+  @override
+  void dispose() {
+    _connection?.close();
+    _nmeaController.close();
+    _stateController.close();
+  }
+}