MQTT blocks - Help for request blocks

I need help with these blocks:
image
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...

Thank's!

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:

Hi,

You can find a working example in the Demo project at https://github.com/pixavier/mqtt4snap

Cheers.

thank you !