3.2 Downlink Messages
- Each downlink message is sent by the network server to only one end-device and is
- relayed by a single gateway.2
- Downlink messages use the radio packet explicit mode in which the LoRa physical header
- (PHDR) and a header CRC (PHDR_CRC) are included.3
- Downlink PHY:
| Preamble | PHDR | PHDR_CRC | PHYPayload | |
|---|---|---|---|---|
| 18 | ||||
| Figure 3: Downlink PHY structure |