Communication protocol between CAN and CC2540 chip.

List of commands from CC2540 to CAN transiver:

1. Subscribe to a message
2. Subscribe to a message with a bitmask
3. Unsubscribe from messages
4. Unsubscribe from messages with a bitmask
5. List of all subscriptions
6. Reset filter state
7. Passthrough message

Command message structure

1. Command code (1 byte)
2. Payload size (1 byte)
3. Payload (0 - 255 bytes)

enum {
  CMD_SUBSCRIBE = 1,
  CMD_SUBSCRIBE_BITMASK,
  CMD_UNSUBSCRIBE,
  CMD_UNSUBSCRIBE_BITMASK,
  CMD_LIST,
  CMD_RESET,
  CMD_MSG
} cmd_type;

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