title: How often check APNS feedback?
body: <p>To detect invalid tokens, how often should I check the feedback service? </p>
  
  <p>I have implemented a broadcasting system using the APNS service. I open a connection, send all the APNS messages, and disconnect. I then open a feedback connection right after the broadcast completes, and read any invalid tokens. </p>
  
  <p>I do get invalid tokens on the feedback connection. However, often my broadcast will only partially succeed (some devices receive and others do not), and when I remove all but the known-good tokens, my test devices consistently receive the message. </p>
  
  <p>I assume that means Apple is stopping the broadcast after it receives the first few invalid tokens.</p>
  
  <p>So am I not listening on the Feedback properly?</p>