I simply applied a display filter of "mqtt" and could see the traffic between the devices.
You may wish to modify the MQTT dissector preferences to display the data as required.
- Checking the "Show Messages as text" option shows the data as a text string.
- Adding a message decoding setting can use other dissectors, e.g. adding a decoding of "Equal to | tele/Wemos1/SENSOR | none | json" shows the data as a json object.
