title: Send Push notifications to iOS/Android on closed WiFi nework (no internet connection)
body: <p>I would like to create an app that users can use in an area/venue where there is <strong>NO</strong> GSM/3G or any kind of cell reception. We also only provide a closed WiFi network without an internet uplink, so it's a LAN where devices (PC's and Smartphones) can communicate with each other but not with the outside world (don't ask why :)</p>
  
  <p>The users will be instructed to download the app before they come to the venue.</p>
  
  <p>My app needs to be able to receive push notification but of course it cannot reach Apple's APNS or Google cloud messaging services. The app however does register to our central server on the LAN with an IP. (it logs in when the user is connected to the WiFi network and we have the phonenumber that belongs to a registered phone.)</p>
  
  <p>Now my question is: is there a way to send a push notification when an event is triggered and the app needs to wake up without using or connecting to Apple's or Google's online notification services?? E.g. an on premises push notification service that can be used to send a notification to a users phone based on an event that is triggered by our server?
  <br>Any suggestions?</p>
  
  <p>Update: Just to clarify, it's a simple VoiP app that connects to our sip server and let's users call each other so it needs to be fairly real time for the two calls to connect. But apparently you can only wake the app up by push notification and therefor need internet. </p>