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I am building android app1 and app2, which will send data to each other based on this tutorial. The tutorial on GCM and xmpp is pretty straightforward. Google requires 3rd party server app with a backend to send upstream and downstream data to and from the android apps, which is something I couldn't understand. Should that app be an android app to? Or java app on a desktop(because it should run always nonstop)? I couldn't find a tutorial on building that server app. Can someone give me a hint or example?

Anthon
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The_Martian
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  • It has to be a server (could be a desktop running on localhost or hosted on the cloud). There are Java and Python examples at the bottom of the XMPP GCM server [page](https://developer.android.com/google/gcm/ccs.html#implement). – Koh Mar 24 '15 at 17:09

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