Connect the SPI lines on the ESP8266 to the SDIO lines on the Raspberry Pi, and the rest is taken care of by the drivers. “The rest”, by the way, includes bringing the ESP’s processor up ...

With that said, the same goes for a Raspberry Pi. For example, many enthusiasts pair the ESP8266 with an Arduino, but you can also use it without one. You can program it directly and run your own ...