Need a little help for kicking of my own MIDI based Lightroom Classic plugin

MIDI2LR is great, but is not configurable in my desired way (I've really tried, believe me) – So why not make my own plugin? 

As a template I got the famous hello world example as seen here up and running: https://akrabat.com/writing-a-lightroom-classic-plug-in/

What I mainly need:

– A way to listen for MIDI CC messages and notes coming from my op-1 field over bluetooth (the connection worked great with MIDI2LR)

Specific questions:

1) What do I need to install/import to listen for MIDI messages? (the downloaded documentation LrC_11.4_202206021307-2f136917.release_SDK does not mention MIDI at all)

(LuaMidi https://github.com/PedroAlvesV/LuaMidi seems focused on reading and writing midi files and not handling incoming messages)

2) What's the best "architecture" to implement this (I'm a web developer and am therefore not afraid of Lua, which is new to me, but have no clue how "listening constantly for MIDI messages" works inside of lightroom)

Anything to get me started is appreciated.

Thanks a lot!

louis