How to use RAK831 with other MCU not RasPi?

Has anyone programmed RAk831 with ESP8266 or other MCU? I want to deep understand about communicating SPI between RAk831 and raspberry pi. I reading Lora packet_forword but I have a problem when converting SPI of raspberry Pi to SPI of MCU.
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A post was merged into an existing topic: The hard RAK831 cafe part 2