I have this cheap bluetooth multimedia controller with 5 keys (play, prev, next, vol up, vol down). It's all connected and key presses are recognised:

 

[root] [~] # showkey
kb mode was UNICODE
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
keycode 164 press
keycode 164 release

How do I go from here? How do I make this 164 key press to run "mpc toggle" command?

 

It's an Orange Pi PC+ and Armbian 5.90. This is a console-only machine. No any X window system (most of the keybind solutions I've found were X related).

The easier way is probably to use "triggerhappy". 

 

But could you tell me what is your "cheap bluetooth multimedia controller" (if I wanted to buy one).

 

https://aliexpress.com/item/32891411315.html

 

I'll take a look at triggerhappy. Thanks!

showkey show keycodes and not keysyms but "thd --dump /dev/input/event*" will tell you".

My personal experience is that keeping (classical) BT connection is too power hungry for batteries. So The device must disconnect after a few seconds. With devices such PS2 remote (if I force disconnection), the first press is lost and the (re)connection delay is longer than one second. Please tell me if you get better results.

It's just like you said. The first press is lost and reconnection takes more than one second. But that I can live with.