public async Task ConnectAsync()
{
if (isDisposed)
{
throw new ObjectDisposedException("SerialDeviceManager");
}
Exception connectException = null;
await deviceEventCtrl.RaiseAsync(this, async() =>
{
if (state != OTPDeviceState.Disconnected)
{
throw new Exception("Device manager is in wrong state: " + state.ToString());
}
try
{
port.Open();
commHelper = new StreamCommHelper(port.BaseStream, config);
var lcgInitValues = await CommHelper.Resync(); //run resync;
reqLCG.ReInit(lcgInitValues.Key);
ansLCG.ReInit(lcgInitValues.Value);
}
catch (Exception ex)
{
commHelper = null;
connectException = ex;
state = OTPDeviceState.Failed;
return(new OTPDeviceEventArgs()
{
State = OTPDeviceState.Failed, Error = ex
});
}
//run ping worker thread
pingWorker = PingWorker.StartNewWorker(pingLock, CommHelper, reqLCG, ansLCG, config.PING_INTERVAL, PingFailedCallback);
//state change
state = OTPDeviceState.Connected;
return(new OTPDeviceEventArgs()
{
State = OTPDeviceState.Connected, Error = null
});
});
if (connectException != null)
{
throw connectException;
}
}
public async Task DisconnectAsync()
{
if (isDisposed)
{
throw new ObjectDisposedException("SerialDeviceManager");
}
Exception disconnectException = null;
await deviceEventCtrl.RaiseAsync(this, () =>
{
if (state != OTPDeviceState.Connected)
{
throw new Exception("Device manager is in wrong state: " + state.ToString());
}
try
{
pingWorker.Stop(); //kill ping worker thread (should not throw exceptions)
port.Close();
}
catch (Exception ex)
{
disconnectException = ex;
state = OTPDeviceState.Failed;
return(Task.FromResult(new OTPDeviceEventArgs()
{
State = OTPDeviceState.Failed, Error = ex
}));
}
finally
{
pingWorker = null;
commHelper = null;
}
//state change
state = OTPDeviceState.Disconnected;
return(Task.FromResult(new OTPDeviceEventArgs()
{
State = OTPDeviceState.Disconnected, Error = null
}));
});
if (disconnectException != null)
{
throw disconnectException;
}
}
public void PingFailedCallback(Exception ex)
{
try
{
deviceEventCtrl.Raise(this, () =>
{
if (state == OTPDeviceState.Connected)
{
state = OTPDeviceState.Failed;
return(new OTPDeviceEventArgs()
{
State = OTPDeviceState.Failed, Error = ex
});
}
throw new PingFailedCallbackException();
});
}
catch (PingFailedCallbackException) { }
}
private static void Reset()
{
lastState = OTPDeviceState.Disconnected;
lastException = null;
}
private static void OnDeviceManagerEvent(object sender, OTPDeviceEventArgs args)
{
lastState = args.State;
lastException = args.Error;
}
