| LoRaWAN Header   | LoRaWAN payload                  |
+ ---- + --------- + -------------------------------- +
|      | RuleID=21 | W = 0 | C = 1 | Padding=b'000000 |
+ ---- + --------- + ----- + ----- + ---------------- +
| XXXX |  1 byte   | 1 bit | 1 bit |     6 bits       |