The original idea was: how to check the status of the CAN bus.
. is there any dialogue ?
. are there any messages?
of course this can be done with MySensors.
But to get as close as possible to the communication channel (the CAN bus) I thought it was easy to do.
this is by reading the post of bricoleau here
text french
that the idea came to me.
- on the arduino have a blinking led to say that the CAN bus is out of order (but we forget, it loads the program unnecessarily)
 
and also because you suggested it to me
yes we have to beat the iron when it is hot, and my time available for the computer will soon be reduced (purchase and work of a house)
I appreciate very much your explanatory note, thank you
I activated the 16Mhz in the sketch, and put it back in the library
  #define MY_NODE_ID 57          /*Node en ID static*/
  #define MY_CAN
  #define CAN_CLOCK MCP_16MHZ