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Wire MQTT availability into HA discovery

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This commit is contained in:
Adrian A. Baumann
2026-06-27 01:40:57 +02:00
parent 409eeb4895
commit eafdf87563
1 changed files with 8 additions and 3 deletions
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src/main.cpp
+8 -3
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@@ -14,6 +14,8 @@
#define MQTT_MANUFACTURER "Baumann Enkataleiptics" #define MQTT_MANUFACTURER "Baumann Enkataleiptics"
#define AUTH_USERNAME "admin" #define AUTH_USERNAME "admin"
#define MQTT_PROBE_TIMEOUT_MS 400 // keep short: blocks loop()/handleClient() per reconnect attempt #define MQTT_PROBE_TIMEOUT_MS 400 // keep short: blocks loop()/handleClient() per reconnect attempt
#define MQTT_PAYLOAD_AVAILABLE "online"
#define MQTT_PAYLOAD_NOT_AVAILABLE "offline"
struct MeterConfig { struct MeterConfig {
int pin; int pin;
@@ -256,6 +258,9 @@ static void mqttPublishDiscovery() {
doc["name"] = name; doc["name"] = name;
doc["state_topic"] = stat; doc["state_topic"] = stat;
doc["command_topic"] = stat + "/set"; doc["command_topic"] = stat + "/set";
doc["availability_topic"] = String(mqttCfg.prefix) + "/status";
doc["payload_available"] = MQTT_PAYLOAD_AVAILABLE;
doc["payload_not_available"] = MQTT_PAYLOAD_NOT_AVAILABLE;
doc["min"] = meters[i].rangeMin; doc["min"] = meters[i].rangeMin;
doc["max"] = meters[i].rangeMax; doc["max"] = meters[i].rangeMax;
doc["step"] = 0.1; doc["step"] = 0.1;
@@ -268,7 +273,7 @@ static void mqttPublishDiscovery() {
char topic[128]; char topic[128];
snprintf(topic, sizeof(topic), "homeassistant/number/%s/config", objId.c_str()); snprintf(topic, sizeof(topic), "homeassistant/number/%s/config", objId.c_str());
char payload[512]; char payload[768];
serializeJson(doc, payload, sizeof(payload)); serializeJson(doc, payload, sizeof(payload));
bool pubOk = mqttClient.publish(topic, payload, true); bool pubOk = mqttClient.publish(topic, payload, true);
Serial.printf("[MQTT] discovery %s -> %s (ok=%d)\n", topic, payload, pubOk); Serial.printf("[MQTT] discovery %s -> %s (ok=%d)\n", topic, payload, pubOk);
@@ -323,11 +328,11 @@ static bool mqttConnect() {
Serial.printf("[MQTT] connecting to %s:%d as %s\n", mqttCfg.host, mqttCfg.port, clientId); Serial.printf("[MQTT] connecting to %s:%d as %s\n", mqttCfg.host, mqttCfg.port, clientId);
bool ok = mqttClient.connect(clientId, user, pass, bool ok = mqttClient.connect(clientId, user, pass,
statusTopic, 0, true, "online: false"); statusTopic, 0, true, MQTT_PAYLOAD_NOT_AVAILABLE);
if (ok) { if (ok) {
Serial.printf("[MQTT] connected to %s:%d\n", mqttCfg.host, mqttCfg.port); Serial.printf("[MQTT] connected to %s:%d\n", mqttCfg.host, mqttCfg.port);
mqttClient.publish(statusTopic, "online: true", true); mqttClient.publish(statusTopic, MQTT_PAYLOAD_AVAILABLE, true);
mqttSubscribe(); mqttSubscribe();
mqttPublishDiscovery(); mqttPublishDiscovery();
for (int i = 0; i < meterCount; i++) for (int i = 0; i < meterCount; i++)