MQTT blocks - Help for request blocks

I need help with these blocks:
I understand all other blocks in the lib but not these.

I want to request who is online on a topic and wait for a restonse from all others...


Those blocks were made by the original author of the JavaScript code in the extension @xavierpi

I'll see if I can contact him off site and get him to come and explain them to you :slight_smile:


You can find a working example in the Demo project at


thank you !

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