| FPort  | LoRaWAN payload                              |
+ ------ + -------------------------------------------- +
| RuleID | W = b'11 | C = 1 | b'11111 | 0xFF (all 1's)  |
+ ------ + -------- + ------+-------- + ----------------+
| 8 bits |  2 bits  | 1 bit | 5 bits  | 8 bits          |
              next L2 Word boundary ->| <-- L2 Word --> |