Lightrun
question-mark
Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

RPC error with MQTTv5 and QoS2

See original GitHub issue

Describe the bug

I started using RPC and developed a custom client based on your RPC extension. Without specifying a MQTT protocol version, everything works as expected.

However to be able to use the new UserProperties of the MQTT message, I specified the protocol version v5 in the client options:

.WithProtocolVersion(MqttProtocolVersion.V500)

After changing the protocol version to v5, the server is logging an error (please see attached log below) and the second RPC call is timing out / client is disconnected.

This problem seems to be related to QoS2 I use for the RPC messages. If I switch to QoS0, this error does not occur.

Which project is your bug related to?

  • ManagedClient / RPC
  • Server

Additional context / logging

Server

[DEBUG] 2019-08-08 10:11:01 - Client '127.0.0.1:53942' accepted by TCP listener '0.0.0.0:1883, ipv4'.
[DEBUG] 2019-08-08 10:11:01 - RX (47 bytes) <<< Connect: [ClientId=a03bffc41eae40fda49690c8f9c68fe9] [Username=] [Password=] [KeepAlivePeriod=15] [CleanSession=True]
[DEBUG] 2019-08-08 10:11:01 - Created a new session for client 'a03bffc41eae40fda49690c8f9c68fe9'.
[DEBUG] 2019-08-08 10:11:01 - MQTT: Client a03bffc41eae40fda49690c8f9c68fe9 connected
[ INFO] 2019-08-08 10:11:02 - Client 'a03bffc41eae40fda49690c8f9c68fe9': Session started.
[DEBUG] 2019-08-08 10:11:02 - TX (5 bytes) >>> ConnAck: [ReturnCode=ConnectionAccepted] [ReasonCode=Success] [IsSessionPresent=False]
[DEBUG] 2019-08-08 10:11:02 - RX (67 bytes) <<< Subscribe: [PacketIdentifier=1] [TopicFilters=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login/response@ExactlyOnce]
[DEBUG] 2019-08-08 10:11:02 - TX (6 bytes) >>> SubAck: [PacketIdentifier=1] [ReturnCodes=SuccessMaximumQoS2] [ReasonCode=GrantedQoS2]
[DEBUG] 2019-08-08 10:11:02 - RX (323 bytes) <<< Publish: [Topic=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login] [Payload.Length=266] [QoSLevel=ExactlyOnce] [Dup=False] [Retain=False] [PacketIdentifier=2]
[DEBUG] 2019-08-08 10:11:02 - TX (7 bytes) >>> PubRec: [PacketIdentifier=2] [ReasonCode=Success]
[DEBUG] 2019-08-08 10:11:02 - MQTT: Message from "a03bffc41eae40fda49690c8f9c68fe9": "Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login"
[DEBUG] 2019-08-08 10:11:02 - RX (4 bytes) <<< PubRel: [PacketIdentifier=2] [ReasonCode=Success]
[DEBUG] 2019-08-08 10:11:02 - TX (4 bytes) >>> PubComp: [PacketIdentifier=2] [ReasonCode=Success]
[DEBUG] 2019-08-08 10:11:02 - Queued application message with topic 'Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login/response' (ClientId: a03bffc41eae40fda49690c8f9c68fe9).
[DEBUG] 2019-08-08 10:11:02 - TX (447 bytes) >>> Publish: [Topic=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login/response] [Payload.Length=380] [QoSLevel=ExactlyOnce] [Dup=False] [Retain=False] [PacketIdentifier=1]
[DEBUG] 2019-08-08 10:11:02 - RX (66 bytes) <<< Unsubscribe: [PacketIdentifier=3] [TopicFilters=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login/response]
[DEBUG] 2019-08-08 10:11:02 - TX (6 bytes) >>> UnsubAck: [PacketIdentifier=3] [ReasonCodes=Success]
[DEBUG] 2019-08-08 10:11:02 - RX (7 bytes) <<< PubRec: [PacketIdentifier=1] [ReasonCode=Success]
[DEBUG] 2019-08-08 10:11:02 - RX (77 bytes) <<< Subscribe: [PacketIdentifier=4] [TopicFilters=Geminos.RPC/a1699c2022be47d585fee532c678b61c/GetTransactions/response@ExactlyOnce]
[DEBUG] 2019-08-08 10:11:02 - TX (6 bytes) >>> SubAck: [PacketIdentifier=4] [ReturnCodes=SuccessMaximumQoS2] [ReasonCode=GrantedQoS2]
[ WARN] 2019-08-08 10:11:02 - Sending publish packet failed: Communication exception (ClientId: a03bffc41eae40fda49690c8f9c68fe9). MQTTnet.Exceptions.MqttCommunicationException: The ReasonCode must be set for MQTT version 5. ---> MQTTnet.Exceptions.MqttProtocolViolationException: The ReasonCode must be set for MQTT version 5.
   bei MQTTnet.Formatter.V5.MqttV500PacketEncoder.ThrowReasonCodeNotSetException()
   bei MQTTnet.Formatter.V5.MqttV500PacketEncoder.EncodePubRelPacket(MqttPubRelPacket packet, IMqttPacketWriter packetWriter)
   bei MQTTnet.Formatter.V5.MqttV500PacketEncoder.Encode(MqttBasePacket packet)
   bei MQTTnet.Adapter.MqttChannelAdapter.<SendPacketAsync>d__34.MoveNext()
   --- Ende der internen Ausnahmestapelüberwachung ---
   bei MQTTnet.Adapter.MqttChannelAdapter.WrapException(Exception exception)
   bei MQTTnet.Adapter.MqttChannelAdapter.<SendPacketAsync>d__34.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei MQTTnet.Server.MqttClientConnection.<SendAsync>d__41.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei MQTTnet.Server.MqttClientConnection.<SendPendingPacketsAsync>d__40.MoveNext()
[DEBUG] 2019-08-08 10:11:02 - RX (236 bytes) <<< Publish: [Topic=Geminos.RPC/a1699c2022be47d585fee532c678b61c/GetTransactions] [Payload.Length=169] [QoSLevel=ExactlyOnce] [Dup=False] [Retain=False] [PacketIdentifier=5]
[DEBUG] 2019-08-08 10:11:02 - TX (7 bytes) >>> PubRec: [PacketIdentifier=5] [ReasonCode=Success]
[DEBUG] 2019-08-08 10:11:02 - Client 'a03bffc41eae40fda49690c8f9c68fe9': Stopped checking keep alive timeout.
[ INFO] 2019-08-08 10:11:02 - Client 'a03bffc41eae40fda49690c8f9c68fe9': Session stopped.
[DEBUG] 2019-08-08 10:11:02 - MQTT: Message from "a03bffc41eae40fda49690c8f9c68fe9": "Geminos.RPC/a1699c2022be47d585fee532c678b61c/GetTransactions"
[DEBUG] 2019-08-08 10:11:02 - Session for client 'a03bffc41eae40fda49690c8f9c68fe9' deleted.
[DEBUG] 2019-08-08 10:11:02 - MQTT: Client a03bffc41eae40fda49690c8f9c68fe9 disconnected
[DEBUG] 2019-08-08 10:11:02 - Client '127.0.0.1:53942' disconnected at TCP listener '0.0.0.0:1883, ipv4'.

Client

[ INFO] 2019-08-08 10:11:01 - Started 
[DEBUG] 2019-08-08 10:11:01 - Trying to connect with server 'localhost:1883' (Timeout=00:00:10). 
[DEBUG] 2019-08-08 10:11:01 - Connection with server established. 
[DEBUG] 2019-08-08 10:11:01 - Start receiving packets. 
[DEBUG] 2019-08-08 10:11:01 - TX (47 bytes) >>> Connect: [ClientId=a03bffc41eae40fda49690c8f9c68fe9] [Username=] [Password=] [KeepAlivePeriod=15] [CleanSession=True] 
[DEBUG] 2019-08-08 10:11:02 - RX (5 bytes) <<< ConnAck: [ReturnCode=] [ReasonCode=Success] [IsSessionPresent=False] 
[DEBUG] 2019-08-08 10:11:02 - Authenticated MQTT connection with server established. 
[ INFO] 2019-08-08 10:11:02 - Connected. 
[DEBUG] 2019-08-08 10:11:02 - Start sending keep alive packets. 
[DEBUG] 2019-08-08 10:11:02 - TX (67 bytes) >>> Subscribe: [PacketIdentifier=1] [TopicFilters=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login/response@ExactlyOnce] 
[DEBUG] 2019-08-08 10:11:02 - RX (6 bytes) <<< SubAck: [PacketIdentifier=1] [ReturnCodes=] [ReasonCode=GrantedQoS2] 
[DEBUG] 2019-08-08 10:11:02 - TX (324 bytes) >>> Publish: [Topic=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login] [Payload.Length=266] [QoSLevel=ExactlyOnce] [Dup=False] [Retain=False] [PacketIdentifier=2] 
[DEBUG] 2019-08-08 10:11:02 - RX (7 bytes) <<< PubRec: [PacketIdentifier=2] [ReasonCode=Success] 
[DEBUG] 2019-08-08 10:11:02 - TX (4 bytes) >>> PubRel: [PacketIdentifier=2] [ReasonCode=Success] 
[DEBUG] 2019-08-08 10:11:02 - RX (4 bytes) <<< PubComp: [PacketIdentifier=2] [ReasonCode=Success] 
[DEBUG] 2019-08-08 10:11:02 - RX (446 bytes) <<< Publish: [Topic=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login/response] [Payload.Length=380] [QoSLevel=ExactlyOnce] [Dup=False] [Retain=False] [PacketIdentifier=1] 
[DEBUG] 2019-08-08 10:11:02 - TX (66 bytes) >>> Unsubscribe: [PacketIdentifier=3] [TopicFilters=Geminos.RPC/38838db0dad847e9a0220b4d9993512f/Login/response] 
[DEBUG] 2019-08-08 10:11:02 - TX (7 bytes) >>> PubRec: [PacketIdentifier=1] [ReasonCode=Success] 
[DEBUG] 2019-08-08 10:11:02 - RX (6 bytes) <<< UnsubAck: [PacketIdentifier=3] [ReasonCodes=Success] 
[DEBUG] 2019-08-08 10:11:02 - TX (77 bytes) >>> Subscribe: [PacketIdentifier=4] [TopicFilters=Geminos.RPC/a1699c2022be47d585fee532c678b61c/GetTransactions/response@ExactlyOnce] 
[DEBUG] 2019-08-08 10:11:02 - RX (6 bytes) <<< SubAck: [PacketIdentifier=4] [ReturnCodes=] [ReasonCode=GrantedQoS2] 
[DEBUG] 2019-08-08 10:11:02 - TX (237 bytes) >>> Publish: [Topic=Geminos.RPC/a1699c2022be47d585fee532c678b61c/GetTransactions] [Payload.Length=169] [QoSLevel=ExactlyOnce] [Dup=False] [Retain=False] [PacketIdentifier=5] 
[DEBUG] 2019-08-08 10:11:02 - RX (7 bytes) <<< PubRec: [PacketIdentifier=5] [ReasonCode=Success] 
[DEBUG] 2019-08-08 10:11:02 - TX (4 bytes) >>> PubRel: [PacketIdentifier=5] [ReasonCode=Success] 
[ WARN] 2019-08-08 10:11:02 - MQTT communication exception while receiving packets. MQTTnet.Exceptions.MqttCommunicationException: Eine vorhandene Verbindung wurde vom Remotehost geschlossen ---> System.Net.Sockets.SocketException: Eine vorhandene Verbindung wurde vom Remotehost geschlossen
   bei System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
   bei System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei MQTTnet.Implementations.MqttTcpChannel.<ReadAsync>d__17.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei MQTTnet.Formatter.MqttPacketReader.<ReadFixedHeaderAsync>d__3.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei MQTTnet.Adapter.MqttChannelAdapter.<ReceiveAsync>d__37.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei MQTTnet.Adapter.MqttChannelAdapter.<ReceivePacketAsync>d__35.MoveNext()
   --- Ende der internen Ausnahmestapelüberwachung ---
   bei MQTTnet.Adapter.MqttChannelAdapter.WrapException(Exception exception)
   bei MQTTnet.Adapter.MqttChannelAdapter.<ReceivePacketAsync>d__35.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei MQTTnet.Client.MqttClient.<TryReceivePacketsAsync>d__48.MoveNext()

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:7

github_iconTop GitHub Comments

1reaction
chkr1011commented, Aug 14, 2019

I was able to reproduce and fixed it. It will be released with the upcoming 3.0.7.

0reactions
michaelrallcommented, Oct 14, 2020

@chkr1011

Hi,

is it possible that this bug still occurs? I have exactely the same issues with a .NET Core 3.1 Client-Application.

Maybe MqttClientConnection.cs:466 is the problem

IS

await SendAsync(new MqttPubRelPacket { PacketIdentifier = publishPacket.PacketIdentifier }).ConfigureAwait(false);

SHOULD BE (?)

await SendAsync(new MqttPubRelPacket { PacketIdentifier = publishPacket.PacketIdentifier, ReasonCode=MqttPubRelReasonCode.Success }).ConfigureAwait(false);

To be honest I can’t debug it myself, because when adding the MQTT-Projects to my project there are some compile errors due to missing packages/features (I guess UWP) and I don’t know how to fix that.

kind regards

Read more comments on GitHub >

github_iconTop Results From Across the Web

RPC error with MQTTv5 and QoS2 · Issue #737
Describe the bug I started using RPC and developed a custom client based on your RPC extension. Without specifying a MQTT protocol version, ......
Read more >
Untitled
I would like to use RPC for communication between fog nodes. ... want to use … where is paducah ky located RPC error...
Read more >
Publish/subscribe AWS IoT Core MQTT messages
Send and receive messages to AWS IoT Core MQTT topics to communicate with the AWS ... bool OnErrorCallback(RpcError error) override { // Handle...
Read more >
Turning MQTT v5 inside out
MQTT is a Client Server publish/subscribe messaging transport protocol. It is light weight, open, simple,.
Read more >
Paho MQTT 5 - Apache Camel
Communicate with MQTT message brokers using Eclipse Paho MQTT v5 Client. ... Allows for bridging the consumer to the Camel routing Error Handler, ......
Read more >

github_iconTop Related Medium Post

No results found

github_iconTop Related StackOverflow Question

No results found

github_iconTroubleshoot Live Code

Lightrun enables developers to add logs, metrics and snapshots to live code - no restarts or redeploys required.
Start Free

github_iconTop Related Reddit Thread

No results found

github_iconTop Related Hackernoon Post

No results found

github_iconTop Related Tweet

No results found

github_iconTop Related Dev.to Post

No results found

github_iconTop Related Hashnode Post

No results found
Previous page

performance issue

Next page

MQTTnet.Exceptions.MqttCommunicationException: Cannot access a disposed object