Hello,

Currently, in Arduino_CAN.h are supported only the following bitrates:

https://github.com/arduino/ArduinoCore-renesas/blob/main/libraries/Arduino_CAN/keywords.txt

BR_100k LITERAL1
BR_125k LITERAL1
BR_250k LITERAL1
BR_500k LITERAL1
BR_1000k LITERAL1

Seems that even 100kbit is not yet supported. However, It would be perfect if you can support 83.3Kbps because it is the standard bitrate of the internal canbus in the most Mercedes Benz cars. And now if you want to communicate with such models and arduino, you need to use an external module or an add on. But since UNO R4 wifi has the on board CAN, it would be ideal if you are able to use it directly.

Thanks for your time