Although there are other ways to do this, [Rod] has decided to write up his method of using two Arduinos and the I2C ... Arduino’s in parallel if the situation called for it. The code for this ...

As of this writing, GPIO, WiFi, SPI and I2C ... simple. Kudos to [me-no-dev] for his work on the back-end here. The HAL inside the Arduino libraries is currently the best source of code examples ...