php - Google Cloud Messaging - too many registered devices cause message fail? -

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I am using Google Messaging to send push notifications for about 4000 devices. There is a problem now that all devices can not receive notifications.

I am using HTML code so that https://android.googleapis.com/gcm/send , I checked the feedback and returned as Null (no answer) Firstly it works fine with small amounts of equipment (less than 300 devices when I checked).

Do I have to split the registered ID and send message several times? For example, to send information to all devices will take 10 minutes (400 devices at one time, sent 10 times, take 1 minute per minute)

I would like to ask if there is no limit on the number Is GCM's registered device, or any famous problem that I need to send the request to?

Thank you!

You can send up to 1000 registration IDs in a single HTTP request on the GCM server. Beyond 1000 IDs, you have to divide them into multiple requests.

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