GNSS szervíz refraktorálás, hibajavítás, PhoneGpsConnection osztály

lib/services/gnss/bt_serial_gnss_connection.dart

@@ -2,8 +2,11 @@
 import 'dart:async';
 import 'dart:typed_data';
 import 'package:flutter_bluetooth_serial/flutter_bluetooth_serial.dart';
+import 'package:geolocator/geolocator.dart';
+import 'package:get/get.dart';
 import 'gnss_connection.dart';
 import 'gnss_device_service.dart';
+import 'dart:convert';
 
 class BtSerialGnssConnection implements GnssConnection {
   @override
@@ -11,6 +14,7 @@ class BtSerialGnssConnection implements GnssConnection {
 
   BluetoothConnection? _connection;
   String _messageBuffer = '';
+  String _lineBuffer = '';
 
   final _nmeaController = StreamController<String>.broadcast();
   final _stateController = StreamController<GnssConnectionState>.broadcast();
@@ -48,41 +52,24 @@ class BtSerialGnssConnection implements GnssConnection {
 
   // A meglévő _onDataReceived logika változatlanul
   void _onData(Uint8List data) {
-    int backspacesCounter = 0;
-    for (var byte in data) {
-      if (byte == 8 || byte == 127) backspacesCounter++;
-    }
+    _lineBuffer += utf8.decode(data, allowMalformed: true);
 
-    Uint8List buffer = Uint8List(data.length - backspacesCounter);
-    int bufferIndex = buffer.length;
-    backspacesCounter = 0;
+    final lines = const LineSplitter().convert(_lineBuffer);
 
-    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];
+    for (int i = 0; i < lines.length - 1; i++) {
+      final sentence = lines[i].trim();
+      if (sentence.isNotEmpty) {
+        _nmeaController.add(sentence);
       }
     }
 
-    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);
+    if (_lineBuffer.endsWith('\n')) {
+      if (lines.isNotEmpty && lines.last.trim().isNotEmpty) {
+        _nmeaController.add(lines.last.trim());
+      }
+      _lineBuffer = '';
     } else {
-      _messageBuffer += dataString;
-      return;
-    }
-
-    // Soronként kibocsátjuk
-    for (final line in sentence.split('\n')) {
-      final trimmed = line.trim();
-      if (trimmed.isNotEmpty) _nmeaController.add(trimmed);
+      _lineBuffer = lines.isNotEmpty ? lines.last : _lineBuffer;
     }
   }
 
@@ -96,4 +83,7 @@ class BtSerialGnssConnection implements GnssConnection {
   void sendData(Uint8List data) {
     _connection?.output.add(data);
   }
+
+  @override
+  Stream<Position> get positionStream => const Stream.empty();
 }