how to notify subscriber to do UNSUBSCRIBE by rygel

[Diaz Soho <soho123 2012 gmail com>]

Hi all, 

I want to add a event about :notify the subscriber  to do UNSUBSCRIBE by rygel.

how to do that?

because I trace the code in gupnp, the subscription is handled by gupnp, not rygel.

how I can add the behavior that rygel can check the list of subscriber , and then rygel can send notify the subscriber  to do UNSUBSCRIBE?

Or 

how I can check the list of   subscriber and then rygel can delete it ?

Does anyone have idea?

Thanks!

Soho