I’ve looked into a lot of the internals of the Loxone Miniserver (the CAN bus protocols, the SD card file system, etc) and written it down with a lot of sample code at https://github.com/sarnau/Inside-The-Loxone-Miniserver. For the ambitious i’ve also provided an STM32 ARM implementation of the Loxone Link/Loxone Tree protocol for a lot of hardware at https://github.com/sarnau/LoxLink