Updated

receiveDeviceInfo.js

let express = require('express');
let router = express.Router();

// route that devices will automatically connect and reqister their current ip:port
router.use('/', (req, res) => {
  // Device information object
  // {
  //    serial:   <string>  product serial number
  //    mac:      <string>  mac address of remote device
  //    ip:       <string>  ip address
  //    port:     <int>     port
  //    regTime:  <Date>    time that remote device registered
  //    belongTo: <string>  
  // }
  // record device information
  var deviceInfo = {
    serial: 1,
    mac: 1,
    ip: req.connection.remoteAddress,
    port: req.connection.remotePort,
    regTime: Date.now(),
    belongTo: null
  };
  console.log(deviceInfo); // log incoming information

  // insert into database and return result
  let resData;
  db.insertDocument('cimpsDB', 'devices', deviceInfo)
    .then(() => {
      resData = {
        result: 1,
        message: 'Device register successfully'
      };
      console.log('Success\n\n');

      res.setHeader('Content-Type', 'application/json');
      res.send(JSON.stringify(resData));
    }, err => {
      resData = {
        result: 0,
        message: err
      };
      console.log(err);
    });
});


//export this router to use in our main.js
module.exports = router;