/// <summary>
/// Read a specified navigation value
/// </summary>
/// <param name="value">Navigation value to read</param>
/// <returns>true if the operation succeeded, false otherwise</returns>
public async Task <ReadNavigationValueResult> ReadNavigationValue(NavigationValue value)
{
ReadNavigationValueResult ret = new ReadNavigationValueResult();
// List characteristics
ret.Success = await InitCharacteristics();
if (ret.Success)
{
// Look for the selected characteristic
BleValue val = new BleValue();
BleGattCharacteristic nav_characteristic = _navigation_characteristics[value];
ret.Success = await BleDevice.ReadValueAsync(nav_characteristic, val);
if (ret.Success)
{
switch (value)
{
case NavigationValue.Speed:
{
ret.SpeedValue = val.ToUInt16();
break;
}
case NavigationValue.Latitude:
{
ret.LatitudeValue = val.ToFloat64();
break;
}
case NavigationValue.Longitude:
{
ret.LongitudeValue = val.ToFloat64();
break;
}
case NavigationValue.TrackAngle:
{
ret.TrackAngleValue = val.ToUInt16();
break;
}
default:
{
ret.Success = false;
break;
}
}
}
}
return(ret);
}
/// <summary>
/// Called when a navigation value is being notified
/// </summary>
/// <param name="characteristic">Characteristic which notified the value</param>
/// <param name="value">New characteristic value</param>
private void OnNavigationNotification(BleGattCharacteristic characteristic, BleValue value)
{
if (characteristic.Guid == SpeedGuid)
{
SpeedChanged?.Invoke(value.ToUInt16());
}
else if (characteristic.Guid == LatitudeGuid)
{
LatitudeChanged?.Invoke(value.ToFloat64());
}
else if (characteristic.Guid == LongitudeGuid)
{
LongitudeChanged?.Invoke(value.ToFloat64());
}
else if (characteristic.Guid == TrackAngleGuid)
{
TrackAngleChanged?.Invoke(value.ToUInt16());
}
else
{
}
}