Credit goes to matafonoff for doing all the hard work, I just fixed the interrupts to run on ESP32. ESP32 library which allows you to communicate via J1850VPW. You just have to choose tx and rx pins.
For [re]synchronization, only the first byte of each command has msb == 1 For 63 of 73 commands. 5 lsb of first byte is an Arduino sketch-specific command: setting e.g. PWM parameters: (frequency, % ...
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