Thanks timsson. However, I need to subscribe rather than publish as the publishing is done by Openhab. Based on the content of the topic subscribed in the ESPEasy device, I want to process a rule.

timsson wrote: on <event> do
publish /ESP1/aaa/bbb,1
endon

Tried a few things and found that "MQTT Import" provided the best solution.

I have a setup running with Openhab, MQTT and multiple ESP nodes. One of the ESPEasy nodes running R120 is named "ESP1" and is configured with Subscribe Template "/ESP1/#". Through Openhab, user action generates a MQTT message "/ESP1/aaa/bbb 1". What is the event syntax...