Discovery for reverse connect

[Haeavar]

Is your feature request related to a problem? Please describe.
We are using the reverse connect feature due to the firewalls protecting our OPC UA servers. Due to the firewalls, a discovery (provided by the REST Api) is not possible. But it would be great, if the REST Api would have a possibility to discovery the reverse connect ReverseHello message of the clients and reporting its endpoint url.

Describe the solution you'd like
An additional /discovery route to discover all clients which sends ReverseHello messages and report its hostname and port (preferable the endpointUrl used within the endpointUrl.

[marcschier]

This might be difficult due to missing capabilities in the ua stack. I will look into this, for now moving to 2.9.6. Any suggestions or contributions welcome.

[marcschier]

@mregen