Error after integrating mqtt.js with tabris.js

const options = {
clean: true,
connectTimeout: 4000,
protocolVersion: 5,
clientId: `web_${Math.random().toString(16).slice(3)}`,
username: '',
password: ''
};
const connectUrl = 'ws://192.168.2.160:8083/mqtt';
const client = mqtt.connect(connectUrl, options);
client.on("connect", function (connack) {
if(!client.connected)
return;
console.log('ok.')
});

connect ok， Developer App error quit