android - GCM same message received multiple times on server -

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i have implemented gcm ccs server-client architecture, send upstream messages. works same message received multiple times. searched on web didn't find explanation issue. happen when cellphone has bad connection takes time receive ack? solutions make solve issue?

we had same issue , caused because same device has 2 or more google registration id, check code validation avoid this.

i'm not pretty sure in how time google detects registration id same device , proceeds unregister leave one.


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