TLV payloads
| Type | Event / Command | Length | Name |
|---|---|---|---|
| 0x00 | Event | Variable | Heartbeat |
| 0x80 - 0xff | Event / Command | Proprietary payloads |
Heartbeat
Periodically, each Relay Gateway will send a heartbeat message to indicate that that it is still online. Each Relay Gateway relaying this heartbeat payload will add its own Relay ID to the path, such that after the Border Gateway has receive the payload, the full path from sending Relay Gateway to Border Gateway can be obtained.
As the payload size is variable and will increment each time it is relayed, caution must be taken when mixing this event with other events.
Bytes:
| 0 - 28 bytes |
|---|
| Relay path (repeated) |
Relay path
Bytes (repeated):
| 4 bytes | 1 byte | 1 byte |
|---|---|---|
| Relay ID | RSSI | SNR |
Each Relay Gateway relaying the heartbeat payload adds its Relay ID, and the RSSI and SNR of the received heartbeat payload to the end of the Relay path field. Initially this field is empty. If the heartbeat payload is not relayed by any other Relay Gateway, then this field remains empty.
RSSI
Encoded as RSSIdBm = -1 x RSSI
SNR
Bits:
| 7..6 | 5..0 |
|---|---|
| RFU | SNR |
SNR is a signed integer with a minimum value of -32 and a maximum value of
31.