How to send silent push to iOS via Google Cloud Messaging

Question

How to send silent push notification to iOS application over GCM?

Silent push is notification that will not appear in notification center, but awake application to d

Answer 1

Use the content_available (not content-available) attribute like this:

curl -X POST --header "Content-Type:application/json" --header "Authorization:key=AIzaXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" "https://android.googleapis.com/gcm/send" --data-ascii '{"data":{"xxx":"yyy"},"content_available":true,"to":"XXXXXXXXXX:YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY-ZZZZZZZZZZZZZZZZZZZZ"}'