Socket.io / Node.js : how to get coordinates from phone (using orientation device api)

Socket.io / Node.js "Orientation Device" Game: I'm building a simple game where you use your phone to navigate through a maze on the desktop. I'm able to get the socket.id from the connected device (to appear in the console log) but I can't get the coordinates from the phone to appear as well?

In my main.js file, I've used: socket.emit('coordinates-from-user', xyz);

And in my app.js file, I've tried to emit the coordinates to every client by using: io.sockets.emit('coordinates-from-user', { //attaching x: x, y: y, z: z });

MAIN.JS

// Socket.io connection
var socket = io.connect(); //socket to listen to app


var xyz = {};

// Assigning function to the 'start' event on that socket
    socket.on('start', function(data) { //when we get data from socket
      console.log('User is ' + data.user);
      console.log('Date is ' + data.date);
    });



    // check if DeviceOrientationEvent is supported
        if (!window.DeviceOrientationEvent) {
            document.getElementById('do-unsupported').classList.remove('hidden');
         } else {
            document.getElementById('do-info').classList.remove('hidden');

            //listen for event and handle DeviceOrientationEvent object
            window.addEventListener('deviceorientation', function(event) {

              // gamma is the left-to-right tilt in degrees, where right is positive
              var tiltLeftToRight = event.gamma;
              // beta is the front-to-back tilt in degrees, where front is positive
              var tiltFrontToBack = event.beta;
              // alpha is the compass direction the device is facing in degrees
              var direction = event.alpha;

              // rotate image using CSS3 transform
              var cube = document.getElementById('cube');
              cube.style.webkitTransform = 'rotate('+ tiltLeftToRight +'deg) rotate3d(1,0,0, '+ (tiltFrontToBack*-1)+'deg)';
              cube.style.MozTransform = 'rotate('+ tiltLeftToRight +'deg)';
              cube.style.transform = 'rotate('+ tiltLeftToRight +'deg) rotate3d(1,0,0, '+ (tiltFrontToBack*-1)+'deg)';         

              // set HTML content = tilt OR direction degree (rounded to nearest integer)
              document.getElementById('doTiltFrontToBack').innerHTML = Math.round(tiltFrontToBack);
              document.getElementById('doTiltLeftToRight').innerHTML = Math.round(tiltLeftToRight);
              document.getElementById('doDirection').innerHTML = Math.round(direction);

              document.getElementById('is-absolute').innerHTML = event.absolute ? "true" : "false";
            });
         }

         if (!window.DeviceMotionEvent) {
            document.getElementById('dm-unsupported').classList.remove('hidden');
         } else {
            document.getElementById('dm-info').classList.remove('hidden');

            window.addEventListener('devicemotion', function(event) {

              // grab acceleration from the results
               document.getElementById('acceleration-x').innerHTML = Math.round(event.acceleration.x);
               document.getElementById('acceleration-y').innerHTML = Math.round(event.acceleration.y);
               document.getElementById('acceleration-z').innerHTML = Math.round(event.acceleration.z);

              // grab acceleration incl. gravitiy from the results
               document.getElementById('acceleration-including-gravity-x').innerHTML =
                       Math.round(event.accelerationIncludingGravity.x);
               document.getElementById('acceleration-including-gravity-y').innerHTML =
                       Math.round(event.accelerationIncludingGravity.y);
               document.getElementById('acceleration-including-gravity-z').innerHTML =
                       Math.round(event.accelerationIncludingGravity.z);

              // grab rotation rate from the results
               document.getElementById('rotation-rate-beta').innerHTML = Math.round(event.rotationRate.beta);
               document.getElementById('rotation-rate-gamma').innerHTML = Math.round(event.rotationRate.gamma);
               document.getElementById('rotation-rate-alpha').innerHTML = Math.round(event.rotationRate.alpha);

              // grab refresh interval from the results
               document.getElementById('interval').innerHTML = event.interval;

              xyz = {
                x: Math.round(event.accelerationIncludingGravity.x),
                y: Math.round(event.accelerationIncludingGravity.y),
                z: Math.round(event.accelerationIncludingGravity.z)
               }

              socket.emit('coordinates-from-user', xyz);

            });
         }

         if (!('oncompassneedscalibration' in window)) {
            document.getElementById('cnc-unsupported').classList.remove('hidden');
         } else {
            window.addEventListener('compassneedscalibration', function(event) {
               alert('Compass needs calibrating! Wave your device in a figure-eight motion');
            });
         }

APP.JS

var express = require('express');

var app = express();
var server = require('http').Server(app);
var io = require('socket.io')(server);
var port = 3300; //start a connect the app on port 3300

app.use('/', express.static(__dirname + '/public'));
server.listen(port, function() { 
    console.log('Server running at port:' + port);
});

var users = [];

//Assign function to 'connection' event for the connected socket
io.on('connection', function(socket) {
    /*––––––––––– SOCKET.IO starts here –––––––––––––––*/

    /*
    .on
    .emit
    .broadcast

    */
    // When Browser connects to socket: (whenever connection event fires)
        // EMIT 'start' event to connected socket
    socket.emit('start', { //start event is something we define
        //pass in an object:
        user: socket.id, //user property
        date: new Date() //date property (todays date)
    });
    console.log(socket.id + ' just connected'); 
    addUser(socket.id);

    //Our event handlers
    // Listening for coordinates
    socket.on('coordinates', function(data) { //when we get data from the socket
        // Coordinates from one user
        console.log(socket.id + ' has sent: ' + data);
        // Emit coordinates to every clients (all players)
        io.sockets.emit('coordinates-from-user', {
            //attaching
            x: x,
            y: y,
            z: z
        });
    });
});

//
function addUser(user) {
    if(users.indexOf(user) === -1) {
        users.push(user);
    }
    console.log('current users: ' + users.length);
}

function removeUser(user) {
    users.splice(user, 1);
    console.log('current users: ' + users.length);
}