Thanks for your answer ... appreciate!
I'm having an Intel NUC i5 with integrated IR receiver and I'm not having a physical remote. But I can configure (all) remotes with my Harmony Elite. I'm not a dev but I think as long as I'm having the right pairing on my libreelec and Harmony it should work.
I know that there is a "working" NUC Remote on Harmony but this has very limited functionality.PS.: I already checked your guide but I'm getting an error message on putty when running the command "remotecfg/storage/.config/testremote.conf ... "-sh: remotecfg: not found"
The guide is for amlogic devices - there's no amremote on your nuc so it won't work.
What remote (device) are you using with your Harmony?