Registration is removed after sendNotification call

Question

Hi All,
   I am using Java and com.windowsazure.messaging.NotificationHub wrapper to push notifications to mobile devices. I can successfully register my Android device and then call getRegistration() method without problem, it returns correct result.
Then I call sendNotification() (successfully) and call getRegistration() again. The problem is, after sending notification getRegistration() always returns  "404 Not Found" error, so I have to register device again, and then cycle repeats. What
may cause registration deletion after push attempt? There is nothing in documentation about it

Answer 1

Hi Teslenko,
When NotificationHub try to send the notification to GCM, it provides response about whether device is expired/Invalid along with other PNS errors in case of failures.  Then NotificationHub
deletes all expired and invalid registrations to avoid the DOS attacks.
As you are seeing registration getting deleted, it means either your device is expired or invalid. But in your case, my guess would be it's due to bad channel.
Could check the registration ID that is generated on the client side. It seems that registration id in the client side and server side do not match.
Here is the explanation from the
https://developer.android.com/google/gcm/http.html
“Check the formatting of the registration ID that you pass to the server. Make sure it matches the registration ID the phone receives in the com.google.android.c2dm.intent.REGISTRATION
intent and that you're not truncating it or adding additional characters. Happens when error code is InvalidRegistration”
Thanks,
Sateesh
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