Detect event "client create subscription" on my opc ua server|OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

Hi, I have created an application based om opc foundation reference server. The application also contain an opc ua client.

First my client connect to a 3rd party opc ua server and browses this servers nodes and then I publish the same browsed nodes on my own opc ua server. 

The purpose of my application is to expose the same nodes as the 3rd party opc ua server.

When a client finally connect to my opc ua server and create a subscription,  I want to detect /monitor this creation/ event on my opc ua server, to be able use my client to initiate the same subscriptions on the 3rd party opc ua server and then publish.

Any suggestions on how /where to detect such events on the opc ua server side.

Regards Vegard