Not Able to connect to CTT and inject errors to server

[jchirantan]

Hi @kevinherron,

I am using Eclipse-milo version 0.6.16 to connect to server. I want to connect to CTT to check how it behaves after injectin some errors.

I am using CTT version 1.4.9.398

When I am connecting to the server from CTT, I don't get any logs on CTT. For example, Browse, Read, Publish, Call, etc.

I am using the underlying server as Prosys and connecting to CTT using the URL "opc.tcp://localhost:4842".

I get logs in Prosys Request Response logs as follows:

But logs in CTT are only GetEndpoints:

[kevinherron]

You'll have to share some code and maybe a Wireshark capture. What are the contents of the GetEndpointsResponse? What are you doing with it?

[jchirantan]

I am calling the getEndpoints() method and filtering the endpoints based on protocol, security mode, security policy and security level.

            List<EndpointDescription> allEndpoints = DiscoveryClient.getEndpoints(getDiscoveryEndpointUri()).get();
            // Filter out endpoints by protocol
	EndpointDescription[] endpoints = EndpointUtils.selectByProtocol(allEndpoints, getProtocol());

	// Filter out endpoints by message securty mode 
	endpoints = EndpointUtils.selectByMessageSecurityMode(endpoints, getMessageSecurityMode());
	
	// Filter out endpoints by security policy
	endpoints = EndpointUtils.selectBySecurityPolicy(endpoints, getSecurityPolicy()); 
	
	// Sort endpoints by security level. The lowest level at the beginning, the highest at the end of the array
	endpoints = EndpointUtils.sortBySecurityLevel(endpoints); 

Then returning the best match endpoint for further connections.

Following is the connection code:

                     OpcUaClientConfig config = OpcUaClientConfig.builder()
				 	                            .setApplicationName(new LocalizedText("Session"))
	                                                            .setEndpoint(this.endpoint)
	                                                            .setIdentityProvider(new AnonymousProvider())
	                                                            .build();
		OpcUaClient clientLocal = OpcUaClient.create(config);
		clientLocal.connect().get();

[jchirantan]

Hi @kevinherron,

How do you set up the CTT for testing different scenarios?

[kevinherron]

I've never set it up for testing a Client. Only for testing a Server.

[jchirantan]

Thanks for the update.

By the way, I just checked the endpoint which is getting selected. I could see the endpoint URL as the URL of the underlying server. That must be the reason for not connecting to CTT.

As a workaround, I just replaced the URL in the endpoint with the URL of CTT, and now I am able to connect to the CTT. Also, I am now able to inject the errors and see the change in behavior accordingly.

I am planning to use these changes for testing on the CTT. Otherwise the connections will use the endpoint that we got from the "getEndpoints" call.

Will this be okay?

[kevinherron]

You can use EndpointUtil.updateUrl to do the replacement.

This seems like a bug in how the client CTT works - I would expect it to return endpoints that point to itself rather than to the underlying server.

[jchirantan]

Yes, I also think the same. Need to check this. But for now it is working with the replacement.

Thanks for your help!!