A decent number micros support CAN natively without a PHY, (STM32), it works well over short to medium length link, and is just _vastly simpler_ than ethernet i

A decent number micros support CAN natively without a PHY, (STM32), it works well over short to medium length link, and is just _vastly simpler_ than ethernet in both protocol and backend implementation. Nothing so complicated TCP/IP stack to deal with, programming for it is more akin to using a serial peripheral on your device.