title: Custom push notification to mobile devices
body: <p>I am searching for information about custom push notification. 
  I want to implement a tunnel between server and devices (Android and iOS). When it comes a time server should send information to device (App). </p>
  
  <p>Also as i know push works just in one way and server don't know if it's message has reached device. Maybe i am wrong at this statement, so please correct me. </p>
  
  <p>I my case i want that server could know this information. So my question would be how to create this behavior between server and device (Android, iOS). Maybe there are some libraries or even protocol name where i should look. </p>
  
  <p>At this moment i am reading about push notification named <a href="http://mqtt.org/" rel="nofollow">MQTT</a> </p>
  
  <p>I would appreciate for any information. </p>
  
  <p>Thank you. </p>