Unity's LLAPI for Raspberry Pi Server?

Hello, I am new to this forum and well, Unity overall. But here's the thing.

I need to develop some sort of "Console", where clients will need to connect to a server (Raspberry Pi) and following this trade information with it. Since I need to do this via Wi-Fi AND Bluetooth, I've decided to use the LLAPI which seems to be the most appropiate to program.

The thing is, I cannot get the LLAPI to work on the Pi. Since Unity won't work on RPi I tried to get the UnityEngine.dll and UnityEngine.Network.dll to the Pi and program based on this, but all I get are errors, I assume because these DLLs requiere something specific from Unity.

Could someone help me? I am open to suggestions here, and kind of desperate to be honest ^^"

Thanks!