RAK831 is a new gateway module based on SX1301 (comparable with the wellknown IC880A)
For the previous part of this topic see: The hard RAK831 cafe part 1
For setting up the software for a RAK831 + Raspberry Pi gateway see:
This covers both RAK831 and iC880a based configurations and different Raspberry Pi devices
(including @charles’ RAK831-Zero Raspberry PI Zero RAK831 Lora Gateway Shield).