getting all the devices of a live.set including grouped ones

Hello.
I am looking for a way to have the ids of all the devices of a live.set, including those in the first rack level, not in other children levels.

There is almost this solution here :
https://cycling74.com/forums/get-all-devices-on-a-track-including-inside-racks

...but it's with js and it "just" outputs the info in the console...

there is almost the solution too in the M4L snippets but it doesn't look in the racks.

I thought it will be easy, but I don't manage to have a "clever" way..

Thank you !