No Discovery Url included in FindServersResponse.

[huebl]

Describe the bug
A FindServers request is sent to the OPC UA stack. The answer does not include a discovery URL.

Expected behavior
The Find Servers Response must return all discovery URLs of the OPC UA server.

[huebl]

The OpcUaStack itself is not responsible for processing the find server request. He forwards the request to an opc ua application. If an application does not have an implementation for the find server service, the request will be answered with an error message.

In our case, the demo server answers the find server request. But the demo server does not set all parameters in the response. For example, the UAExpert client does not find the opc ua server. He can not connet.

[huebl]

The behavior should be changed as follows..

• The opc ua demo application reads the endpoints from the configuration file and returns those endpoints to the caller of the service.