M2 CAN Point to Point
Send a CAN frame between 2 M2's.
Connect both M2s and OBD3way board as shown below. This connects the CAN0 of one M2 to the CAN0 of the other.
CAN0 on the left is connected to CAN0 on the right.
Try sending a CAN frame from one M2 to the other; pushing the button on one M2 should cause the other M2 to blink, signifying it has received the frame! You can also try rerouting the jumpers to send between the different CAN channels. (The M2 sketch also includes serial printouts, keep your M2 connected to your computer and open the Arduino IDE's serial monitor at baud 115200 to view these messages.)