| FPort  | LoRaWAN payload                                      |
+ ------ + --------------------------------- + ---------------- +
| RuleID |   W   | C = 0 | Compressed bitmap | Optional padding |
|        |       |       |      (C = 0)      |    (b'0...0)     |
+ ------ + ----- + ----- + ----------------- + ---------------- +
| 8 bits | 2 bit | 1 bit |    5 to 63 bits   |  0, 6, or 7 bits |