How to detect client createSubscription event on my ua server

[vegard77]

Hi, I have created an c# 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. And if the client connected to my server create subscriptions, use my client to create the same subscriptions and publish. My application is in between due to security.

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?

The 3rd party opc ua server contains maybe 100.000 nodes.
My first attempt was to create several subscriptions and monitor alle nodes using my client and publish everything, but the 3rd party server start to fail when i have more than 30.000 ish monitoreditems.

So then my thought was to trigger my client subscriptions based on what the client connected to my server actually wants. Any ideas /examples or thoughts would be appreciated

Thanks regards Vegard

[romanett]

I did not Look into the Code but i suspect the aggregation Server Sample could fit your usecase: https://github.com/OPCFoundation/UA-.NETStandard-Samples/blob/master/Workshop/Aggregation/README.md