title: How to send Device to device notification by using FCM without using XMPP or any other script.?
body: <p><strong>Is there any way to send Upstream notification message through FCM from one android device to another devices connected with Firebase database.</strong></p>
  
  <p>I know that  XMPP server can then receive the upstream messages and send the notifications to the other devices.To receive messages sent with the upstream API i need to implement an XMPP server but there is any other way???</p>