Dear John Dammeyer,
It worked just by changing the CAN transceiver board.
I was using “cjmcu-230”, but now I am using the one from WAVESHARE company. (it seems to have no specific board name)
https://www.waveshare.com/sn65hvd230-can-board.htm
I really appreciate your work and knowledge here, thank you!
Hope great luck with your life
Suyong Choi