title: QUdpSocket problem
body: <p>I try to send data using UDP protocol. Is it possible to understand when UDP dont send data?</p>
  
  <p>Thanks a lot.</p>
  
  <p>I try to a servis which run into client. And they send their IP an port number in one second. Server listen them and if they dont send this message it understand that client is not connected. I do this but I cant understand when they dont send? Do you have any suggestion</p>