[muntos]

I was under the impression that the Shield TV reads IR commands out of the box.

What gave you that impression? The specs say it's a Bluetooth remote with "IR blaster for control of volume and power on TVs, soundbars, or receivers".

Probabily because I've read that the remote knows IR also, and automatically I wrongly assumed that it's in relation with the Shield device not with other devices. It's clear now, thank you !