fix edge error

src/middlewares/mqtt.js

@@ -10,7 +10,6 @@ const mqttMiddleware = (function () {
     let reconnectPeriod = null;
     let client = null;
     let interval = null;
-    let decoder = new TextDecoder("utf-8");
     return (store) => {
         let messages = [];
         if (interval) clearInterval(interval);
@@ -45,7 +44,7 @@ const mqttMiddleware = (function () {
                         });
                         client.on('message', (msgTopic, msg) => {
 
-                            const message = decoder.decode(msg);
+                            const message =msg.toString();
                             if (config.debug) console.info('MQTT: Message recieved.\nTopic: %s\nPayload: %s', topic, message);
                             if (_.isEqual(topic, msgTopic)) {
                                 messages.push({topic, message: message, timestamp: new Date().getTime()});