| FPort  | LoRaWAN payload                                |
+ ------ + ---------------------------------------------- +
| RuleID | W = b'1 | C = b'1 | b'111111 | 0xFF (all 1's)  |
+ ------ + ------- + ------- + -------- + --------------- +
| 8 bits | 1 bit   | 1 bits  | 6 bits   | 8 bits          |
                next L2 Word boundary ->| <-- L2 Word --> |