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Since I want to build reliable communication in mobile apps, could I get push failed reports(maybe device is offline) from the third party push services (C2DM, APN, urban airship) ?
Or We need to build it by ourselves?
The intended purpose of Android C2DM is to be a battery-saving way for your server app to signal the mobile device that it wants to start reliable communications.
You can structure your message so that each new C2DM encompasses everything that has occurred since the last two-way interaction with the server (i.e., “come and get whatever I’ve got”). Your failed delivery report is implicit in the mobile device not responding promptly (you can do this because you know C2DM activates your app with an Intent).
Is that really any worse than guaranteed delivery of each message in a lossy medium? Okay, it’s worse in that you also have to implement a primary communication method. But you had to do that anyway because C2DM is inbound-only, right?