title: java how to measure delay between server and clients
body: <p>I have an android app that I want to send some commands(usually integer) to some clients (they're also in java andoid) . thing that is important is measuring the delay time between send command and recieving the message(in client). the app will share the current time of a music to all clients and they should play it so Simultaneous (to be is sync!!). what's your Idea about this?</p>
  
  <p>Thank You again :)</p>