encodeLocationMessage function

List<int> encodeLocationMessage({ required Location location, required double altitudePressure, required double altitudeGeodetic, required double height, required double verticalSpeed, required double horizontalSpeed, required int direction, required Duration timestamp, })

Implementation

List<int> encodeLocationMessage({
  required Location location,
  required double altitudePressure,
  required double altitudeGeodetic,
  required double height,
  required double verticalSpeed,
  required double horizontalSpeed,
  required int direction,
  required Duration timestamp,
}) {
  // second byte contains flags
  final eastWestBit = direction < 180 ? 0 : 1;
  final secondByte =
      (OperationalStatus.airborne.value << 4) +
      (HeightType.aboveGroundLevel.value << 2) +
      (eastWestBit << 1);

  final locationAccuracyByte =
      (VerticalAccuracy.meters_1.value << 4) +
      HorizontalAccuracy.meters_1.value;
  final baroAndSpeedAccuracyByte =
      (VerticalAccuracy.meters_1.value << 4) +
      SpeedAccuracy.meterPerSecond_1.value;

  return mergeFieldsToMessage([
    encodeField(encodeFirstByte, MessageType.location),
    [secondByte],
    encodeField(encodeDirection, direction),
    encodeField(encodeHorizontalSpeed, horizontalSpeed),
    encodeField(encodeVerticalSpeed, verticalSpeed),
    encodeField(encodeCoordinate, location.latitude),
    encodeField(encodeCoordinate, location.longitude),
    encodeField(encodeAltitude, altitudePressure),
    encodeField(encodeAltitude, altitudeGeodetic),
    encodeField(encodeAltitude, height),
    [locationAccuracyByte, baroAndSpeedAccuracyByte],
    encodeField(encodeLocationTimestamp, timestamp),
    encodeField(encodeTimestampAccuracy, const Duration(milliseconds: 500)),
    [0x00], // filler byte
  ]);
}