[Bug] An error occurs when a received message contains a topic alias

[tigercl]

What did I do

I use MQTTX CLI to subscribe to a topic. When the server forwards a message containing the topic alias to MQTTX CLI, the CLI will print the following error log:

And, when I set a topic alias, and send multiple messages with the --multiline option, each message will contain both the topic and the topic alias:

mqttx pub --topic mytopic --topic-alias 1 --stdin --multiline

In fact, except for the first message, all subsequent messages only need to contain the topic alias.

Expected

MQTTX CLI should receive messages with the topic alias normally.

Environment

• OS: OS version, e.g. macOS Big Sur 11.1
• MQTTX version, e.g. v1.9.4

[ysfscream]

Thank you for the feedback. The issue should be fixed in v1.9.7. Please feel free to test and provide additional feedback.