Question(/possible Feature?): Sending "Power off" keyboard button signal

[aetonsi]

hi,
i was reading up here: https://github.com/tiny-pilot/tinypilot/wiki/Add-an-RF-controlled-power-socket-to-TinyPilot (😦)
and here: https://forum.tinypilotkvm.com/-29/no-usb-input

... and i was wondering if it would be possible to send the "Power off" keyboard button signal many multimedia keyboards have (not talking about laptops).
I am talking about KBs like these:

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So i stumbled upon this: https://wiki.osdev.org/PS/2_Keyboard
and especially this: https://aeb.win.tue.nl/linux/kbd/scancodes-1.html#power

... but not being a linux expert...

i just wasted many hours trying to find the right device, how to send codes, how to read(?) available codes, and even just how to print "Hi" as in the example code from the thread above:

echo -ne "\x20\0\xb\0\0\0\0\0" > /dev/hidg0 && \
echo -ne "\0\0\xc\0\0\0\0\0" > /dev/hidg0 && \
echo -ne "\0\0\0\0\0\0\0\0" > /dev/hidg0

This example just prints "H" for me, for some reason.... After many hours i figured out how to print "Hi":

echo -ne "\x20\x00\x0B\x00\x00\x00\x00\x00" "\x8B\x00\x00\x00\x00\x00\x00\x00" > /dev/hidg0 && \
echo -ne "\x00\x00\x0C\x00\x00\x00\x00\x00" "\x8C\x00\x00\x00\x00\x00\x00\x00" > /dev/hidg0

# or simply

echo -ne "\x20\0\x0B\0\0\0\0\0" "\x8B\0\0\0\0\0\0\0" "\0\0\x0C\0\0\0\0\0" "\x8C\0\0\0\0\0\0\0" > /dev/hidg0

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is this something that could be done? I think it might even be useful to add it to the "visual" keyboard?