msp over wifi implemented

app/lib/transport/msp/msp_telemetry_codec.dart

@@ -10,6 +10,7 @@ class MspGpsReading {
     required this.lat,
     required this.lon,
     required this.speedMs,
+    required this.headingDeg,
   });
 
   /// 0 = kein Fix (`fc_msp.c`: `gpsSol.fixType`).
@@ -19,6 +20,10 @@ class MspGpsReading {
   final double lon;
   final double speedMs;
 
+  /// Kurs ueber Grund in Grad (0 = Norden, im Uhrzeigersinn), aus
+  /// `groundCourse` - nur bei [hasFix] aussagekraeftig.
+  final double headingDeg;
+
   bool get hasFix => fixType != 0;
 }
 
@@ -31,6 +36,7 @@ MspGpsReading parseMspRawGps(Uint8List payload) {
     lat: data.getInt32(2, Endian.little) / 1e7,
     lon: data.getInt32(6, Endian.little) / 1e7,
     speedMs: data.getUint16(12, Endian.little) / 100.0,
+    headingDeg: data.getUint16(14, Endian.little) / 10.0,
   );
 }