How Active Device Registered count for Notification Hub can be decreased

1
votes

Could somebody shed a light in following situation: Yesterday I reviewed Notification Hub blade in Azure portal for our Development notification hub and there were 872 Active Registered Devices. Today I see only 656 Active Registered Devices: enter image description here

At the same time this notification hub doesn't have Registration Time to Live, on Properties tab I see Registration Time to Live = 10,675,199 days. So I suppose that devices are still registered but they maybe are inactive now.

So my questions are:

  • How Azure determine that device is active?
  • Does it mean that the apps cannot sent notifications to inactive devices?
1
azurepush-notificationazure-notificationhub

1 Answers

0
votes

When a Push Notification Service (PNS) notifies Azure Notification Hubs that the device token is invalid, Notification Hubs flags the registration for deletion. A housekeeping task runs periodically and deletes those registrations automatically.

Yes, apps cannot send notifications to inactive devices. For example, when a user uninstalls an app, the existing device token won't work anymore (There's no associated app on the device to respond). When the same user reinstalls the app, a new device token is generated, making the old one invalid as well.