Communication protocol between CAN and CC2540 chip. [[BR]]

List of commands from CC2540 to CAN transiver: 
 1. Subscribe to a message
 2. Subscribe to a message with bitmask
 3. Unsubscribe from messages
 4. Unsubscribe from messages with bitmask 
 5. List of all subscriptions 
 6. 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 
 3. - 10. bytes 0076h & 0155h