Fix bridge/state online not send after reconnect. https://github.com/Koenkk/zigbee2mqtt/issues/4854

lib/controller.js

@@ -149,7 +149,6 @@ class Controller {
         // MQTT
         this.mqtt.on('message', this.onMQTTMessage.bind(this));
         await this.mqtt.connect();
-        this.mqtt.publish('bridge/state', 'online', {retain: true, qos: 0});
 
         // Send all cached states.
         if (settings.get().advanced.cache_state_send_on_startup && settings.get().advanced.cache_state) {

lib/mqtt.js

@@ -72,8 +72,10 @@ class MQTT extends events.EventEmitter {
         return new Promise((resolve) => {
             this.client = mqtt.connect(mqttSettings.server, options);
 
+            const self = this;
             this.client.on('connect', () => {
                 logger.info('Connected to MQTT server');
+                self.publish('bridge/state', 'online', {retain: true, qos: 0});
                 resolve();
             });