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Currently, the MQTT dissector does not support a range of ports, only a single port for dissection. For now, you can use the "Decode As" feature to force packets on port 1884 to be decoded as MQTT packets. To do that, either:

  • Right-click on a packet with port 1884 and choose, "Decode As...", or
  • From the main toolbar menu, choose *Analyze -> Decode As...".

Add/replace a new entry for port 1884 to be decoded as MQTT.

If you'd like the MQTT dissector to support a range of ports, you could try opening a Wireshark enhancement bug report asking for this to be implemented.