MQTT: do not crash when MQTTPublish has no underlayer - #5089
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MQTTPublish.msgid and MQTTPublish.value read QOS/len from the underlayer without a None check, so MQTTPublish().show() raised AttributeError. Guard both callbacks so a standalone publish packet can be displayed. Fixes secdev#5071 AI-Assisted: yes
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Fixes #5071.
MQTTPublishreadsQOSandlenfrompkt.underlayerin themsgidcondition and thevaluelength callback. Building or displaying a publish packet with no underlayer (MQTTPublish().show()) raisedAttributeError: 'NoneType' object has no attribute 'QOS'.Both callbacks now treat a missing underlayer as QoS 0 / empty payload, which matches how a standalone publish is constructed. Existing layered build/dissect tests are unchanged.
Repro that used to crash:
./test/run_tests -P "load_contrib('mqtt')" -t test/contrib/mqtt.uts— 25 passed.