Shutdown over keyboard button

[fefitohh]

Hi all

I want to perform the shutdown on/off of the system with a generic keyboard with any random button, instead of ussing GPIO ports (https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)).

This is the keyboard I have:

Any ideas on how to do this?

BR