title: Push Notification from one android device to another
body: <p>Here I am developing an android app which deals with housing complex.</p>
  
  <p>In this app their are 2 kinds of users: </p>
  
  <ol>
  <li>Builder/Complex Owner </li>
  <li>Flat Owner.</li>
  </ol>
  
  <p>Now here the Builder/Complex Owner can send push notification to flat owners.</p>
  
  <p>How can I achieve that? Please help.</p>
  
  <p>Here I cannot use G.C.M as G.C.M. is used for server side push messaging. </p>