title: Realtime notifications using socket.io or any other better option ? Want instant notifications like whatsapp
body: <p>I am working on a travel app, notifications play a very vital role, as the app involves payments and instant verification. Please suggest how it can be achieved.</p>
  
  <p>Will keeping a service for socket.io connection drain a lot of battery?</p>
  
  <p>will the device kill the service when the user swipe kills the app from recent apps?</p>