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POWeird Apple Push Notification behaviour when the receiving iPhone is turned off
 

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  1. POWeird Apple Push Notification behaviour when the receiving iPhone is turned off
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    <p>I'm seeing some very strange behaviour from the Apple Push Notification Servers when the recipient iPhone is off. Here is my scenario:</p> <blockquote> <p>-Send push notification A to Apple. Within a few seconds a push notification popup gets displayed as expected on the iPhone.<br> -Send blank notification to Apple to cancel previous one (the previous notification is pointless after about 10 seconds, that's why I want to get rid of it). Nothing displayed on the iPhone.<br> -Turn OFF iPhone completely (not asleep, it is powered down).<br> -Send push notification B to Apple. Wait 10 seconds.<br> -Send blank notification to Apple to cancel previous one. Wait 10 seconds.<br> -Send push notification C to Apple. Wait 10 seconds.<br> -Send blank notification to Apple to cancel previous one. Wait 30 seconds.<br> -Turn ON iPhone.<br> -After about 60 seconds a push notification popup is displayed for notification B on the iPhone.<br> -Notification C never seems to arrive.</p> </blockquote> <p>This is very strange! From reading the Apple docs I was expecting only the latest push notification to be sent. I was hoping my blank notification would be sent, I certainly wasn't expecting the oldest unsent push notification to be sent!</p> <p>The Apple docs say:</p> <blockquote> <p>Apple Push Notification Service includes a default Quality of Service (QoS) component that performs a store-and-forward function. If APNS attempts to deliver a notification but the device is offline, the QoS stores the notification. It retains only one notification per application on a device: the last notification received from a provider for that application. When the offline device later reconnects, the QoS forwards the stored notification to the device. The QoS retains a notification for a limited period before deleting it.</p> </blockquote> <p>Has anybody seen this behaviour? Am I just hitting some sort of timing window bug? What should happen?</p> <p><strong>Updates</strong>:<br> -If I turn the phone off and wait 5 to 15 minutes before sending any push notifications then this problem doesn't occur. In this case when I turn the phone on I don't see any notification popup, although I'm not sure if this is a result of Apple dropping the notification, or their 'queue' working correctly (i.e. holding the newest blank notification instead of the first one with the popup).<br> -I will investigate further by putting an APNsLogging.mobileconfig onto the iPhone to see what notifications it got.<br> -Turning wifi off doesn't seem to change the results.<br> -I have raised a bug report with Apple for this scenario. </p>
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    1. COWhat do you mean cancel previous one? You can't cancel a notification after it is sent.
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    2. CONew push notifications clear previous ones on the iPhone receiving them, so you can effectively cancel a previous notification by sending a new blank notification with no popup message. That mostly works fine for me.
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