private async void DeviceInRange(object sender, BluetoothWin32RadioInRangeEventArgs?e)
{
if (e?.Device == null)
{
Log.Warning("Windows.BluetoothService: Discovered NULL device");
return;
}
if (e.Device.DeviceAddress == MacUtils.ToAddress(_currentMac))
{
Log.Debug($"Windows.BluetoothService: Target device inbound ({_currentMac})");
if (IsStreamConnected)
{
Log.Debug($"Windows.BluetoothService: Target device already connected");
}
else
{
try
{
await ConnectAsync(_currentMac, _currentUuid);
}
catch (InvalidOperationException ex)
{
BluetoothErrorAsync?.Invoke(this, new BluetoothException(BluetoothException.ErrorCodes.Unknown, ex.Message));
Log.Error($"Windows.BluetoothService: DeviceInRange: InvalidOperationException caught ({ex.Message})");
}
catch (BluetoothException ex)
{
BluetoothErrorAsync?.Invoke(this, ex);
Log.Error($"Windows.BluetoothService: DeviceInRange: BluetoothException caught ({ex.Message})");
}
}
}
}
public async Task ConnectAsync(string macAddress, string uuid, bool noRetry = false)
{
var semResult = await _connSemaphore.WaitAsync(5000);
if (semResult == false)
{
Log.Error($"Windows.BluetoothService: Connection attempt timed out due to blocked semaphore");
throw new BluetoothException(BluetoothException.ErrorCodes.TimedOut, "Timed out while waiting to enter connection phase. Another task is already preparing a connection.");
}
if (_client?.Connected ?? false)
{
Log.Debug("Windows.BluetoothService: Already connected, skipped.");
_connSemaphore.Release();
return;
}
SelectAdapter();
Connecting?.Invoke(this, EventArgs.Empty);
Log.Debug($"Windows.BluetoothService: Connecting...");
_cancelSource?.Cancel();
_client?.Close();
_client = null;
SelectAdapter();
if (_client == null)
{
Log.Error("Windows.BluetoothService: Cannot create client and connect.");
BluetoothErrorAsync?.Invoke(this, new BluetoothException(BluetoothException.ErrorCodes.Unknown, "Cannot create client"));
_connSemaphore.Release();
return;
}
try
{
try
{
var addr = MacUtils.ToAddress(macAddress);
if (addr == null)
{
Log.Error("Windows.BluetoothService: Invalid MAC address. Failed to connect.");
throw new BluetoothException(BluetoothException.ErrorCodes.ConnectFailed, "Invalid MAC address. Please deregister your device and try again.");
}
_currentMac = macAddress;
_currentUuid = uuid;
_client.Connect(addr, new Guid(uuid));
/*await Task.Factory.FromAsync(
* (callback, stateObject) => _client.BeginConnect(addr, new Guid(uuid), callback, stateObject),
* _client.EndConnect, null);*/
}
catch (ArgumentException)
{
BluetoothErrorAsync?.Invoke(this, new BluetoothException(
BluetoothException.ErrorCodes.ConnectFailed,
$"Invalid MAC address. Please deregister your device and try again."));
_connSemaphore.Release();
return;
}
Connected?.Invoke(this, EventArgs.Empty);
Log.Debug($"Windows.BluetoothService: Connected. Launching BluetoothServiceLoop.");
_cancelSource = new CancellationTokenSource();
_loop = Task.Run(BluetoothServiceLoop, _cancelSource.Token);
}
catch (SocketException e)
{
BluetoothErrorAsync?.Invoke(this,
new BluetoothException(BluetoothException.ErrorCodes.ConnectFailed, e.Message));
}
finally
{
_connSemaphore.Release();
}
}