Alternative firmware based on libopencm3 for Makerbase CANable 2.0 USB Adapter (schematics, aliexpress) based on STM32G4 MCU + TJA105T CANbus transceiver
It uses USB CDC-ACM (taken from libopencm3-examples and adapted for using with STM32G4) as a transport for CANbus frames in the same proprietary format as used by Gree Data Converter (ZTS6L)