Question

Let’s say I have 3 notifications to send – a, b and c – but there is a problem with notification b. Let’s assume it is an invalid token. If I do the following:

1. Create buffer
2. Add a,b and c to buffer
3. Send buffer to APNS server

Will message c be sent?

The Apple documentation says:

If you send a notification and APNs finds the notification malformed
or otherwise unintelligible, it returns an error-response packet prior
to disconnecting.

Does this mean that I would receive an error about b and the connection would be dropped, and therefore c would never be sent?

Answer 1

Message c would never be sent. If you manage to receive the error response for message b, you have to resend all the messages you sent after sending b and before receiving the response.

You can read a good article about it here : The Problem with APNS