Bluetooth keyboard not recognized?

Goodnight all !

My Bluetooth keyboard is not recognized by RetroArch (on Android no problem it works perfectly).

I use the MAME Libretro core in version 0.226 because it is the only one that allows me to run all the old microcomputers (see the subject here)

How do I run my games with this core & have my keyboard recognized correctly ?

Thanks best regards !

No one to help me ?!