CAN TP

Once you understand classic CAN and CAN FD, the next natural thought is: if one frame cannot hold the data, why not just split it in application code and send multiple frames? That can work in the simplest experiments, but once a real system is involved, problems appear quickly: how does the receiver know where the long message starts and ends, what happens if one frame is missing, what if the sender transmits too fast for the receiver to keep up, and what if both directions have large messages at the same time?