socket.io - push notification to client when Firebase have a new child doesn't work -

the code below listening new child added firebase push client using socket.io, problem socket.io doesn't fire emit, idea of how make send data client?

server:

firebaseref.endat().limittolast(1).on('child_added', function (childsnapshot, prevchildkey) { console.log('new gps point added ' + childsnapshot.val());  io.on('connection', function (socket) {     console.log('new gps point added 2' + childsnapshot.val());     socket.volatile.emit('gpspoint', childsnapshot.val());      socket.on('my other event', function (data) {         console.log(data);     }); }); }); 

client: (inside angular control)

    var socket = io.connect('http://localhost:8080');     socket.on('gpspoint', function (data) {         console.log(data);         socket.emit('my other event', { my: 'data' });     }); 

the socket connection should done outside firebase function:

var sockets=[]; io.on('connection', function (socket) { console.log('new socket: '+ socket); sockets.push(socket);});   

inside firebase function should use sockets connected client :

firebaseref.endat().limittolast(1).on('child_added', function (childsnapshot, prevchildkey) {   for(var i=0;i<sockets.length;++i) {       console.log('socket'+sockets[i]);       socket=sockets[i];       socket.volatile.emit('gpspoint', childsnapshot.val()); }});