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I’m using C2DM in my application, and it works well, but sometimes, when I’m sending lots of messages, the delay is appearing, in it is up to 5 minutes.
All of my messages have the same collape key. Is it normal for C2DM?
EDIT: I’m sending approximately 1-2 messages per second
EDIT2: It is slow only for one device; another device receives notifications instantly
Probably due to network lags, you have to take network transience into account.
By the way, if you are sending 2 messages per second, your are sending 172800 messages to one device per day. You have a limit of 200,000 messages per day for one C2DM account. Clearly you aren’t using C2DM the way it’s supposed to be used. 🙂
Keep the application state in the server, not in the device, using a collapse key. So that only the most fresh result is delivered. Or else attenuation will be used to save battery.