ONVIF Camera Authentication Fails After Some Time

[stoex]

I am using the Onvif.Core library in a .NET 6 application to communicate with an ONVIF-compatible camera (AXIS M5525-E). Initially, everything works fine, but after some time, all requests fail with the following SOAP response:

The action requested requires authorization and the sender is not authorized.

Could this be due to the fact that the library uses WS-Security with PasswordDigest authentication and that after a certain period, the timestamp for authentication is no longer valid?

Can a keep-alive mechanism be added to the library, or would I need to manually renew the camera object?

[jlovald]

The current implementation does not account for time drift as you described. So a device going offline or clock drift can cause the PasswordDigest to not work.

An issue with the current implementation is that the wcf clients (PTZ, Imaging, Media) are created upon the first request to that particular client. So the the easiest thing would be to periodically get a new Camera instance. The maintainer could consider expanding the Camera class with a method for either renewing the clients, or set them to null so they are renewed the next time they are called.