Task ProcessReceivedPubRecPacket(MqttPubRecPacket pubRecPacket, CancellationToken cancellationToken)
{
if (!_packetDispatcher.TryDispatch(pubRecPacket))
{
// The packet is unknown. Probably due to a restart of the client.
// So wen send this to the server to trigger a full resend of the message.
return(SendAsync(new MqttPubRelPacket
{
PacketIdentifier = pubRecPacket.PacketIdentifier,
ReasonCode = MqttPubRelReasonCode.PacketIdentifierNotFound
}, cancellationToken));
}
return(PlatformAbstractionLayer.CompletedTask);
}
async Task TryProcessReceivedPacketAsync(MqttBasePacket packet, CancellationToken cancellationToken)
{
try
{
if (packet is MqttPublishPacket publishPacket)
{
EnqueueReceivedPublishPacket(publishPacket);
}
else if (packet is MqttPubRecPacket pubRecPacket)
{
await ProcessReceivedPubRecPacket(pubRecPacket, cancellationToken).ConfigureAwait(false);
}
else if (packet is MqttPubRelPacket pubRelPacket)
{
await ProcessReceivedPubRelPacket(pubRelPacket, cancellationToken).ConfigureAwait(false);
}
else if (packet is MqttDisconnectPacket disconnectPacket)
{
await ProcessReceivedDisconnectPacket(disconnectPacket).ConfigureAwait(false);
}
else if (packet is MqttAuthPacket authPacket)
{
await ProcessReceivedAuthPacket(authPacket).ConfigureAwait(false);
}
else if (packet is MqttPingRespPacket)
{
_packetDispatcher.TryDispatch(packet);
}
else if (packet is MqttPingReqPacket)
{
throw new MqttProtocolViolationException("The PINGREQ Packet is sent from a Client to the Server only.");
}
else
{
if (!_packetDispatcher.TryDispatch(packet))
{
throw new MqttProtocolViolationException($"Received packet '{packet}' at an unexpected time.");
}
}
}
catch (Exception exception)
{
if (_cleanDisconnectInitiated)
{
return;
}
if (exception is OperationCanceledException)
{
}
else if (exception is MqttCommunicationException)
{
_logger.Warning(exception, "Communication error while receiving packets.");
}
else
{
_logger.Error(exception, "Error while receiving packets.");
}
_packetDispatcher.FailAll(exception);
await DisconnectInternalAsync(_packetReceiverTask, exception, null).ConfigureAwait(false);
}
}