How to update Expiration Time in Azure Notification Hub registration?

Question

I've been working with Azure Notification Hubs for awhile. However, I created a new Notification Hub for a new project and I've noticed some very odd behavior. Whenever I create a registration its ExpirationDate is set to 12/31/9999 7:59:59.

So, for some, I suppose this may be a benefit, but I'd like to expire mine after a certain period of inactivity. I looked through the RegistrationDescription object and found an ExpirationTime but it's read only...

How do I set this? Is this just a bug in Azure? Maybe a flag I'm missing from Azure configuration?

Answer 1

You can do that, but on hub level, not on registration level. Check out Improved Per Message Telemetry and device expiry for Notification Hubs blog post:

To take advantage of this expiry change, simply update your notification hub’s Time To Live property. This can be done through REST or our .NET SDK:

var namespaceManager = NamespaceManager.CreateFromConnectionString("connectionstring");
NotificationHubDescription hub = namespaceManager.GetNotificationHub("foo");
hub.RegistrationTtl = TimeSpan.MaxValue;
namespaceManager.UpdateNotificationHub(hub);

To do that via the REST API, check out Update Notification Hub method, which takes NotificationHubDescription body, which has a RegistrationTtl node in it. That should be a REST equivalent of the SDK code snippet above.