The “N” in CAN stands for network, after all. The trick is to create a device ID for each desired CANSerial interface, which is done in his library using the usual Arduino setup step.

Use Arduino to handle sensor input and relay control. Pi runs a Python Flask server with a simple UI to toggle GPIO pins via serial commands sent to the Arduino.

For all its geeky attributes, the Arduino development software, known as Arduino IDE (integrated development environment) has never had a tool for compiling code in the command line.