Add configuration option to send Home Assistant discovery config on MQTT connect

src/config/settings.h

@@ -166,6 +166,7 @@ typedef struct {
     bool json;
     uint16_t interval;
     bool enableRetain;
+    bool sendConfigOnConnect;
 } cfgMqtt_t;
 
 typedef struct {
@@ -473,6 +474,7 @@ class settings {
             mCfg.mqtt.interval = 0; // off
             mCfg.mqtt.json = false; // off
             mCfg.mqtt.enableRetain = true;
+            mCfg.mqtt.sendConfigOnConnect = false;
 
             mCfg.inst.sendInterval       = SEND_INTERVAL;
             mCfg.inst.rstValsAtMidNight   = false;
@@ -728,6 +730,7 @@ class settings {
                 obj[F("json")]     = mCfg.mqtt.json;
                 obj[F("intvl")]    = mCfg.mqtt.interval;
                 obj[F("retain")]   = mCfg.mqtt.enableRetain;
+                obj[F("sendConfigOnConnect")] = mCfg.mqtt.sendConfigOnConnect;
 
             } else {
                 getVal<uint16_t>(obj, F("port"), &mCfg.mqtt.port);
@@ -739,6 +742,7 @@ class settings {
                 getChar(obj, F("pwd"), mCfg.mqtt.pwd, MQTT_PWD_LEN);
                 getChar(obj, F("topic"), mCfg.mqtt.topic, MQTT_TOPIC_LEN);
                 getVal<bool>(obj, F("retain"), &mCfg.mqtt.enableRetain);
+                getVal<bool>(obj, F("sendConfigOnConnect"), &mCfg.mqtt.sendConfigOnConnect);
             }
         }
 

src/publisher/pubMqtt.h

@@ -303,7 +303,8 @@ class PubMqtt {
                 subscribe(mVal.data());
             }
             subscribe(subscr[MQTT_SUBS_SET_TIME]);
-            sendDiscoveryConfig();
+            if(mCfgMqtt->sendConfigOnConnect)
+                sendDiscoveryConfig();
         }
 
         void onDisconnect(espMqttClientTypes::DisconnectReason reason) {

src/web/RestApi.h

@@ -731,6 +731,7 @@ class RestApi {
             obj[F("json")]       = (bool) mConfig->mqtt.json;
             obj[F("interval")]   = String(mConfig->mqtt.interval);
             obj[F("retain")]     = (bool)mConfig->mqtt.enableRetain;
+            obj[F("sendConfigOnConnect")] = (bool)mConfig->mqtt.sendConfigOnConnect;
         }
 
         void getNtp(JsonObject obj) {

src/web/html/setup.html

@@ -245,7 +245,11 @@
                                 <div class="col-12 col-sm-9"><input type="number" name="mqttInterval" title="Invalid input" /></div>
                             </div>
                             <div class="row mb-3">
-                                <div class="col-12 col-sm-3 my-2">Discovery Config (homeassistant)</div>
+                                <div class="col-8 col-sm-3">Send Home Assistant discovery config on MQTT connect</div>
+                                <div class="col-4 col-sm-9"><input type="checkbox" name="sendConfigOnConnect"/></div>
+                            </div>
+                            <div class="row mb-3">
+                                <div class="col-12 col-sm-3 my-2">Force sending Home Assistant discovery config</div>
                                 <div class="col-12 col-sm-9">
                                     <input type="button" name="mqttDiscovery" id="mqttDiscovery" class="btn" value="{#BTN_SEND}" onclick="sendDiscoveryConfig()"/>
                                     <span id="apiResultMqtt"></span>
@@ -990,6 +994,7 @@
                     document.getElementsByName("mqtt"+i[0])[0].value = obj[i[1]];
                 document.getElementsByName("mqttJson")[0].checked = obj["json"];
                 document.getElementsByName("retain")[0].checked = obj.retain
+                document.getElementsByName("sendConfigOnConnect")[0].checked = obj["sendConfigOnConnect"];
             }
 
             function parseNtp(obj) {

src/web/web.h

@@ -598,6 +598,7 @@ class Web {
             mConfig->mqtt.json = (request->arg("mqttJson") == "on");
             mConfig->mqtt.port = request->arg("mqttPort").toInt();
             mConfig->mqtt.interval = request->arg("mqttInterval").toInt();
+            mConfig->mqtt.sendConfigOnConnect = (request->arg("sendConfigOnConnect") == "on");
             mConfig->mqtt.enableRetain = (request->arg("retain") == "on");
 
             // serial console