I think that CAN-BUS Shield I linked has an Arduino library on Github, complete with examples you can reference, when you're ready for that step. You mention that most of your dev experience is in ...

OMC has launched a fibre optic transceiver shield for Arduino Uno, designed to work with PMMA (polymer) optical cables up to 25m long, plus demonstration software.

Electronica: Arduino makes single-pair Ethernet accessible, and RS485 too Arduino announced a single-pair Ethernet adapter board for its Uno R4 single-board microcontroller at Electronica this morning ...