Why the callback "on_message" is not triggered?


I take the Paho Python example, but i don’t understand why the calback “on_message” is not triggered when a message is published correctly in the same topic that i’m subscribed.
This the code I used:

This the exit code I’ve got:


This question is not related to MyQttHub but more about coding and how to use client library you are using. Please, review Paho documentation and code.

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