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Received packet 'PubAck: [PacketIdentifier=6538] [ReasonCode=Success]' at an unexpected time. #2079
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I created a smaller sample program (see attached code). I updated to MQTTnet 4.3.7.1207 and Mosquitto 2.0.18a. Behavior is inconsistent. Without debugger (VS 2022 Pro) the code runs reasonably quick with no recorded errors even if I run 500,000 messages through the broker. With debugger the code runs much more slowly. I tried enabling broker logging, but even when errors were common there was nothing in the broker log that indicated there were any problems. The attached code is built as a C# .NET6 console application. The MQTT broker runs locally (same laptop). |
I also observed the same errors when I tried self-hosting the broker using MQTTnet. |
The attached code triggers at least one disconnect and eventually stops receiving messages. |
Seems to be related to #2078 |
Describe the bug
When I publish a relatively large number of messages on the same topic (the number varies) a small percentage of publish calls fail with MqttProtocolViolationException as described in the title. For example, if I send 100,000 messages less than 100 fail, but they all fail with this exception.
I tried updating from 4.3.3.952 to 4.3.7.1207 but the problem persists.
Which component is your bug related to?
To Reproduce
Steps to reproduce the behavior:
Using this version of MQTTnet '...'. 4.3.7.1207
Run this code '....'. I have created a small test program, but it relies on some "wrapper" code that encapsulats the MQTTnet client. I may be able to reproduce the problem without that wrapper code if it would help.
With these arguments '....'.
MQTT client construction:
I am running the Mosquitto broker (version 2.0.14) locally.
The specific method that fails is IMqttClient.PublishAsync(MqttApplicationMessage)
Exception details:
2024-09-12 18:16:59.287 -07:00 [ERR] Unexpected exception occurred when publishing message to topic: notification/foo/bar error: Received packet 'PubAck: [PacketIdentifier=6538] [ReasonCode=Success]' at an unexpected time., will try again.
MQTTnet.Exceptions.MqttProtocolViolationException: Received packet 'PubAck: [PacketIdentifier=6538] [ReasonCode=Success]' at an unexpected time.
at MQTTnet.Client.MqttClient.TryProcessReceivedPacket(MqttPacket packet, CancellationToken cancellationToken)
at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken) at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken) at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken) at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken)at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken) at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken) at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken)at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken) at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken)at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken) at MQTTnet.PacketDispatcher.MqttPacketAwaitable
1.WaitOneAsync(CancellationToken cancellationToken)at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.PacketDispatcher.MqttPacketAwaitable`1.WaitOneAsync(CancellationToken cancellationToken)
at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.Client.MqttClient.Request[TResponsePacket](MqttPacket requestPacket, CancellationToken cancellationToken)
at MQTTnet.Client.MqttClient.PublishAtLeastOnce(MqttPublishPacket publishPacket, CancellationToken cancellationToken)
Expected behavior
I expect all published messages to be published (so they can be received by subscribers).
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