See CanBus

Dedicated tool ?

CAN to USB ?


USB, decodes frames.

not userfriendly, not tested:

STM32(F103) CAN => RS232 special fw ?

115200 baud is not too much: full CAN frames dropped if wouldn't fit into RS232 buffer.

After some time all CAN-ID-s would appear, but timing or frequency of certain ID would not be exact.