title: iOS APNS "best-effort" fallback
body: <p>I cannot seem the have my head around this. APNS as stated in the documentation has best-effort delivery, i.e. delivery is not guaranteed. However, if I am to use the push-notification model in my client/server application, I have to use them somehow. </p>
  
  <p>The general model looks as follows: there is new data on the server -> the server then sends a push notification informing the client(s) that there is new data available -> client downloads new data. </p>
  
  <p>The question is then, if I cannot rely 100% on the notification to be delivered, what kind of fallback mechanism can I use so that I can ensure that the client receives the new data available on the server ? What is the way to ensure that the client has the most-up-to-date data using APNS ?</p>