websockets

tutorial
https://code.tutsplus.com/tutorials/start-using-html5-websockets-today--net-13270

JS dalis paprasta, tik reikia listening serveri pakurt

galima kurti node.js serva su http://socket.io/ 
http://nodeguide.com/beginner.html
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-14-04

galimas variantas ir ant php serveris
http://socketo.me/
arba
https://github.com/WarriorXK/PHPWebSockets