I contacted the tech from Loupedeck in december 2018 :
Hi Aurélien,
currently we do not have plan to compile our service SW for Linux. Our roadmap is full so we do not have time for it. However, the device actually works as midi device. Just create/install a midi listener and you can record the notes and ID’s it is sending. The dials are working so that turning right is +1 and left -1. Making things working this way will be relatively simple. However, you will not have our UI available this way.
For MAC and Windows you can build integration using our SDK, however, you cannot make this Loupedeck plugin open source. This method enables you to use our UI to make configurations. Basic architecture is to create a socket server inside of you SW and make the plugin discuss with it. Please do not expose our API directly but make a conversion.
[…]
However, we will not use midi in future. It is like this only for LD and LD+
So I just abandoned the project after that email.