Communication protocol between CAN and CC2540 chip. [[BR]] List of commands from CC2540 to CAN transiver: 1. Subscribe to a message 2. Unsubscribe from messages 3. List of all subscriptions 4. Passthrough message Command message structure 1. Command code (1 byte) 2. Payload size (1 byte) 3. Payload (0 - 255 bytes) Examples 0x01:0x08:0x00:0x00:0x07:0x06:0x00:0x01:0x05:0x05 1. byte - subsribe command 2. byte - payload size 8 byte = 2 CAN message IDs * 4 byte each