private async Task TrySendPendingPublishPacketAsync(MqttClientPublishPacketContext publishPacketContext)
{
try
{
if (_adapter == null)
{
return;
}
publishPacketContext.PublishPacket.Dup = publishPacketContext.SendTries > 0;
await _adapter.SendPacketAsync(publishPacketContext.PublishPacket, _options.DefaultCommunicationTimeout);
publishPacketContext.IsSent = true;
}
catch (MqttCommunicationException exception)
{
MqttTrace.Warning(nameof(MqttClientMessageQueue), exception, "Sending publish packet failed.");
}
catch (Exception exception)
{
MqttTrace.Error(nameof(MqttClientMessageQueue), exception, "Sending publish packet failed.");
}
finally
{
publishPacketContext.SendTries++;
}
}
private Task HandleIncomingPacketAsync(MqttBasePacket packet)
{
if (packet is MqttSubscribePacket subscribePacket)
{
return(_adapter.SendPacketAsync(_subscriptionsManager.Subscribe(subscribePacket), _options.DefaultCommunicationTimeout));
}
if (packet is MqttUnsubscribePacket unsubscribePacket)
{
return(_adapter.SendPacketAsync(_subscriptionsManager.Unsubscribe(unsubscribePacket), _options.DefaultCommunicationTimeout));
}
if (packet is MqttPublishPacket publishPacket)
{
return(HandleIncomingPublishPacketAsync(publishPacket));
}
if (packet is MqttPubRelPacket pubRelPacket)
{
return(HandleIncomingPubRelPacketAsync(pubRelPacket));
}
if (packet is MqttPubRecPacket pubRecPacket)
{
return(_adapter.SendPacketAsync(pubRecPacket.CreateResponse <MqttPubRelPacket>(), _options.DefaultCommunicationTimeout));
}
if (packet is MqttPubAckPacket || packet is MqttPubCompPacket)
{
// Discard message.
return(Task.FromResult((object)null));
}
if (packet is MqttPingReqPacket)
{
return(_adapter.SendPacketAsync(new MqttPingRespPacket(), _options.DefaultCommunicationTimeout));
}
if (packet is MqttDisconnectPacket || packet is MqttConnectPacket)
{
_cancellationTokenSource.Cancel();
return(Task.FromResult((object)null));
}
MqttTrace.Warning(nameof(MqttClientSession), $"Client '{_identifier}': Received not supported packet ({packet}). Closing connection.");
_cancellationTokenSource.Cancel();
return(Task.FromResult((object)null));
}
private Task SendAsync(MqttBasePacket packet)
{
return(_adapter.SendPacketAsync(packet, _options.DefaultCommunicationTimeout));
}