Hello,
Where can I find any information about how to communicate whit RAK2287 over USB such as commands or … !
Typically with LoRa Concentrator cards (of all brands not just RAK’s) there isn’t really comprehensive documentation, but rather offered open source code.
At least for the previous generation sx1301 concentrator chip, there’s no programmer manual from the chip vendor Semtech, just an electrical data sheet and the LoRa HAL library. I suspect the situation with the sx1302 used in the RAK2287 is similar.
Essentially, you use the offered software, or if you need something different, you modify that into what you need.