text: Gd.conn.connMQTT = function (opt) {
      let me = {};
  
      var mqtt = require('mqtt');
      let client = me.client  = mqtt.connect(opt.url, opt);
  
      client.on('connect', function () {
          Log.log(`Broker ${opt.url} connected.`);
      });
  
      client.on('message', function (topic, message) {
          // message is Buffer
          Log.log('Broker: ' + message.toString());
          //client.end()
      });
  
      return me;
  };
  