| LoRaWAN Header    | LoRaWAN payload (44 bytes) |
+ ---- + -----------+ -------------------------- +
|      | RuleID=20  |   W   |  FCN  |     RCS    |
+ ---- + ---------- + ----- + ----- + ---------- +
| XXXX | 1 byte     | 0   0 |   63  |  4 bytes   |