private async Task TrySendNextQueuedPacketAsync(IMqttChannelAdapter adapter, CancellationToken cancellationToken)
{
MqttBasePacket packet = null;
try
{
lock (_queue)
{
if (_queue.Count > 0)
{
packet = _queue.Dequeue();
}
}
if (packet == null)
{
await _queueAutoResetEvent.WaitOneAsync(cancellationToken).ConfigureAwait(false);
return;
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
adapter.SendPacketAsync(packet, cancellationToken).GetAwaiter().GetResult();
_logger.Verbose("Enqueued packet sent (ClientId: {0}).", _clientSession.ClientId);
}
catch (Exception exception)
{
if (exception is MqttCommunicationTimedOutException)
{
_logger.Warning(exception, "Sending publish packet failed: Timeout (ClientId: {0}).", _clientSession.ClientId);
}
else if (exception is MqttCommunicationException)
{
_logger.Warning(exception, "Sending publish packet failed: Communication exception (ClientId: {0}).", _clientSession.ClientId);
}
else if (exception is OperationCanceledException)
{
}
else
{
_logger.Error(exception, "Sending publish packet failed (ClientId: {0}).", _clientSession.ClientId);
}
if (packet is MqttPublishPacket publishPacket)
{
if (publishPacket.QualityOfServiceLevel > MqttQualityOfServiceLevel.AtMostOnce)
{
publishPacket.Dup = true;
Enqueue(publishPacket);
}
}
if (!cancellationToken.IsCancellationRequested)
{
_clientSession.Stop(MqttClientDisconnectType.NotClean);
}
}
}
public Task DisconnectAsync()
{
_session.Stop(MqttClientDisconnectType.NotClean);
return(Task.FromResult(0));
}
