public async Task <byte> ATTClientReadByHandleAsync(byte connectionHandle, UInt16 characteristicUUID)
{
const int TIMEOUT_MS = 4000;
var cmd = _bglib.BLECommandATTClientReadByHandle(connectionHandle, characteristicUUID);
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 = $"ATTClientReadByHandle returned: error={error} code={_lastResult:X4}";
throw new Exception(errMsg);
}
byte conHandle = ((ReadByHandleEventArgs)_lastResponseArgs).connection;
return(conHandle);
}