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fix(mqtt): honor preset retain policy for status publishes

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publishStatusToSlot hardcoded the retain flag to true, ignoring the preset's
allow_retain field that the packets and neighbors paths already respect. The
waev preset (allow_retain=false, MeshCore topic style) has therefore been
publishing retained status to a broker that rejects the retain flag; the same
would now apply to meshrank, which just gained status publishing. Use
slot.preset->allow_retain, defaulting to true for custom slots to preserve
their existing behavior.
This commit is contained in:
agessaman
2026-07-17 08:01:09 -07:00
parent b3bd5ecd3c
commit 028a5dcadd
2 changed files with 7 additions and 3 deletions
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MQTT_IMPLEMENTATION.md
+2 -2
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@@ -296,7 +296,7 @@ set mqtt3.preset meshrank
set mqtt3.token FE1B34242C5938C39225310081FD6718
```
The token is generated on the MeshRank website and is tied to your account. MeshRank receives the same message types as any other preset (`status`, `packets`, `raw`, `neighbors`), each under `meshrank/uplink/{token}/{device_id}/`, subject to the usual `mqtt.status`/`mqtt.raw`/`mqtt.neighbors` toggles.
The token is generated on the MeshRank website and is tied to your account. MeshRank receives the same message types as any other preset (`status`, `packets`, `raw`, `neighbors`), each under `meshrank/uplink/{token}/{device_id}/`, subject to the usual `mqtt.status`/`mqtt.raw`/`mqtt.neighbors` toggles. Its broker does not accept the retain flag, so those publishes go out unretained.
#### Example: Configure MeshMapper on Slot 3
```bash
@@ -500,7 +500,7 @@ The CLI commands are organized into two levels:
The bridge publishes to four main topics with the following structure:
### Status Topic: `meshcore/{IATA}/{DEVICE_PUBLIC_KEY}/status`
Device connection status and metadata (retained messages).
Device connection status and metadata, QoS 1. Retained, except on presets whose broker rejects the retain flag (`meshrank`, `waev`).
### Packets Topic: `meshcore/{IATA}/{DEVICE_PUBLIC_KEY}/packets`
Full packet data with RF characteristics and metadata.
src/helpers/bridges/MQTTBridge.cpp
+5 -1
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@@ -2080,7 +2080,11 @@ void MQTTBridge::publishStatusToSlot(int index) {
);
if (len > 0) {
int result = slot.client->publish(status_topic, 1, true, json_buffer, strlen(json_buffer));
// Honor the preset's retain policy, as the packets/neighbors paths do —
// brokers that set allow_retain=false (meshrank, waev) reject retained
// publishes. Custom slots keep the long-standing retained status behavior.
bool use_retain = slot.preset ? slot.preset->allow_retain : true;
int result = slot.client->publish(status_topic, 1, use_retain, json_buffer, strlen(json_buffer));
if (result <= 0) {
MQTT_DEBUG_PRINTLN("MQTT%d status publish failed", index + 1);
}