public async Task <byte> ATTClientAttributeWriteAsync(byte connectionHandle, UInt16 attHandle, IEnumerable <byte> value)
{
const int TIMEOUT_MS = 6000;
var cmd = _bglib.BLECommandATTClientAttributeWrite(connectionHandle, attHandle, value.ToArray());
await _bglib.SendCommandAsync(cmd).ConfigureAwait(false);
using (var cts = new CancellationTokenSource(TIMEOUT_MS)) {
bool didTimeout = false;
try { await _cmdRespWaitHandle.WaitAsync(cts.Token).ConfigureAwait(false); }
catch (OperationCanceledException) { didTimeout = true; }
if (didTimeout)
{
throw new TimeoutException();
}
}
if (_lastResult != 0)
{
var error = Enum.ToObject(typeof(BGErrorCode), _lastResult);
string errMsg = $"ATTClientAttributeWrite returned: error={error} code={_lastResult:X4}";
throw new Exception(errMsg);
}
byte conHandle = ((AttributeWriteEventArgs)_lastResponseArgs).connection;
return(conHandle);
}
public void AttachCharacteristic(CancellationToken appToken, int connectTimeoutInMilliseconds,
Action <BgBleDeviceAttribute> attributeNotifications, BgBleDeviceCharacteristic deviceCharacteristic)
{
if (deviceCharacteristic.ClientCharacteristicConfiguratorDescriptorHandle == 0)
{
return;
}
try
{
var lockTaken = false;
Monitor.TryEnter(ThreadLock, 150, ref lockTaken);
if (lockTaken)
{
if (_busy)
{
return;
}
_busy = true;
Monitor.Exit(ThreadLock);
}
_attributeNotifications = attributeNotifications;
_currentAction = new CancellationTokenSource();
var attachCharacteristicTokenSource =
CancellationTokenSource.CreateLinkedTokenSource(appToken,
_currentAction.Token);
_bglib.SendCommand(_serialPort,
_bglib.BLECommandATTClientAttributeWrite(deviceCharacteristic.ConnectionHandle,
deviceCharacteristic.ClientCharacteristicConfiguratorDescriptorHandle, new byte[] { 0x01, 0x00 }));
WaitHandle.WaitAny(new[] { attachCharacteristicTokenSource.Token.WaitHandle },
connectTimeoutInMilliseconds);
}
catch (Exception exception)
{
_logger.LogWarning(exception,
$"ControlPlus Repository: Unable to attach characteristic {deviceCharacteristic.CharacteristicId}");
}
_busy = false;
}
