apple push notification with sound buzzing at regular interval

Question

I have a small but tricky question over apple push notification payload on iOS.

From what I know the push notification payload can have sound (length <= 30 seconds),

Answer 1

Yes, it is. This is how you could implement that:

1. Register device for push notification
2. Send out a push message with ref to a sound every 30-60 seconds
3. Invalidate each message after 30-60 seconds, making room for the new one
4. When user re-opens the app, register the app as re-opened to the server and stop sending out push notifications

I do not know how this would look in the notification center, but you can test and have a look :)