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I have packets captured during not encrypted MQTT communication:

Treat

Protocol is detected as TCP. How to ask Wireshark to analyze packets as MQTT?

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UPD

In case I set MQTT server work on default 1883 port I Wireshark treats packets like MQTT. But how to ask Wireshark treat packets lime MQTT when it runs on on default port?

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  • Can you check if your MQTT port is set at 1883? You can check it from - Edit -> Preferences -> Protocols -> MQTT. – Nazia Jahan Trisha Jan 20 '20 at 16:04
  • Yes, it recognizes packets on 1883 port, but how to do the same on not default port? – vico Jan 20 '20 at 16:40
  • Can you give it a try by unticking - Edit -> Preferences -> Protocols -> TCP -> 'allow subdissector to reassemble tcp streams' ? – Nazia Jahan Trisha Jan 20 '20 at 17:00
  • Unticking Edit -> Preferences -> Protocols -> TCP -> 'allow subdissector to reassemble tcp streams' not helps – vico Jan 20 '20 at 20:07
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Right click on a packet, and select Decode as.... A dialog appears, which should contain rules for the port you've selected. In the "Current" column, it will contain (none). Double click that cell, and the contents will change to a drop-down list. From that, select "MQTT", and press OK.

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