Hi there,
I observed situations where a notification won't get delivered to an iPhone that is offline at the moment the notification request is made to the APNs, and gets back online a few hours later.
It does not appear to be a fully repeatable issue, but it does happen much more than sporadically.
I know the storage of notification by APNs is provided as a best-effort service and is not guaranteed, but I do believe there is an issue that maybe is worth looking at.
I controlled for all aspects that could explain the issue:
- APNs return a success code on the request
- the apns-expiration timestamp is not reached when the device gets back online
- apns-priority is set to 10
- target device was in charge while offline
- no other notification were sent for the device
I provided detailed logs in feedback FB15381079
Also sharing a remark on this piece of the APNs documentation: "When you send multiple notifications to the same device for a bundle ID, APNs selects only one notification to store in a non-deterministic way."
It would be very useful to confirm whether silent push notification may lead APNs storage to dismissed an alert notification in favor of the silent push.
Thank you
