Stack Overflow, I Need Your Help! I have read the GCM documentation here and do not fully understand that "GCM only allows at least 4 different collapse keys by GCM server per device" at any time. I would like to tell myself that I believe that if my phones have installed an app (Facebook, Twitter, Instagram, My Mail, Facebook and others), then there is no guarantee that when my device is online for example Return, then GCM will choose the key to my app's collapse. Am i right or not ?? If I am truly the key to this fall, if there is no guarantee that this will work and my app will receive the necessary information at the right time? I need to point to the point that "sync-to-load" is very fond of me and I want to use it, but I'm afraid that when the user is written in a comment, the problems will start "My device Online is back online, but I remember all messages: (<">
GCM collapse_keys limit Depends on a per app level Not installed on does not affect other applications.
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