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OPC UA and Unity3D
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Ragnar Thomsen
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04/18/2017 - 07:39
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Hi,

I'm trying to use Unity3D (an interaction engine) as a Client to connect to an OPC Server.

I'm able to connect to the Server when executing my script in a Console application. However, if I adapt the script to Unity and run it from there, I get the following error message:

ServiceResultException: Error establishing a connection.
Opc.Ua.Bindings.TcpAsyncOperation`1[System.Int32].End (Int32 timeout)
Opc.Ua.Bindings.TcpClientChannel.EndSendRequest (IAsyncResult result)
Opc.Ua.Bindings.TcpTransportChannel.EndSendRequest (IAsyncResult result)
Opc.Ua.Bindings.TcpTransportChannel.SendRequest (IServiceRequest request)
Opc.Ua.DiscoveryClient.GetEndpoints (Opc.Ua.RequestHeader requestHeader, System.String endpointUrl, Opc.Ua.StringCollection localeIds, Opc.Ua.StringCollection profileUris, Opc.Ua.EndpointDescriptionCollection& endpoints)
Opc.Ua.DiscoveryClient.GetEndpoints (Opc.Ua.StringCollection profileUris)
Opc.Ua.ConfiguredEndpoint.UpdateFromServer (Opc.Ua.BindingFactory bindingFactory, System.Uri endpointUrl, MessageSecurityMode securityMode, System.String securityPolicyUri)
Opc.Ua.ConfiguredEndpoint.UpdateFromServer (Opc.Ua.BindingFactory bindingFactory)
Opc.Ua.Client.Session.Create (Opc.Ua.ApplicationConfiguration configuration, Opc.Ua.ConfiguredEndpoint endpoint, Boolean updateBeforeConnect, Boolean checkDomain, System.String sessionName, UInt32 sessionTimeout, IUserIdentity identity, IList`1 preferredLocales)
Opc.Ua.Client.Session.Create (Opc.Ua.ApplicationConfiguration configuration, Opc.Ua.ConfiguredEndpoint endpoint, Boolean updateBeforeConnect, System.String sessionName, UInt32 sessionTimeout, IUserIdentity identity, IList`1 preferredLocales)
script_connectOPC.Start () (at Assets/Resources/script_connectOPC.cs:47)

Has anyone on here any tips on how to connect to an OPC Server from Unity3D?

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Randy Armstrong
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10/03/2017 - 09:46
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Given the error the TCP stack cannot resolved the domain or port passed in the URL.

This can because of a bad URL, problem with DNS, a problem with the networking layer, a firewall or network routing issue.

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Sean MacDonald
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02/09/2018 - 13:03
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Any luck with this?  I have been trying to do the same thing....

Sean MacDonald

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OSCAR RUDAS
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11/15/2018 - 19:35
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ragnar.thomsen@ipk.fraunhofer.de said
Hi,

I'm trying to use Unity3D (an interaction engine) as a Client to connect to an OPC Server.

I'm able to connect to the Server when executing my script in a Console application. However, if I adapt the script to Unity and run it from there, I get the following error message:

ServiceResultException: Error establishing a connection.
Opc.Ua.Bindings.TcpAsyncOperation`1[System.Int32].End (Int32 timeout)
Opc.Ua.Bindings.TcpClientChannel.EndSendRequest (IAsyncResult result)
Opc.Ua.Bindings.TcpTransportChannel.EndSendRequest (IAsyncResult result)
Opc.Ua.Bindings.TcpTransportChannel.SendRequest (IServiceRequest request)
Opc.Ua.DiscoveryClient.GetEndpoints (Opc.Ua.RequestHeader requestHeader, System.String endpointUrl, Opc.Ua.StringCollection localeIds, Opc.Ua.StringCollection profileUris, Opc.Ua.EndpointDescriptionCollection& endpoints)
Opc.Ua.DiscoveryClient.GetEndpoints (Opc.Ua.StringCollection profileUris)
Opc.Ua.ConfiguredEndpoint.UpdateFromServer (Opc.Ua.BindingFactory bindingFactory, System.Uri endpointUrl, MessageSecurityMode securityMode, System.String securityPolicyUri)
Opc.Ua.ConfiguredEndpoint.UpdateFromServer (Opc.Ua.BindingFactory bindingFactory)
Opc.Ua.Client.Session.Create (Opc.Ua.ApplicationConfiguration configuration, Opc.Ua.ConfiguredEndpoint endpoint, Boolean updateBeforeConnect, Boolean checkDomain, System.String sessionName, UInt32 sessionTimeout, IUserIdentity identity, IList`1 preferredLocales)
Opc.Ua.Client.Session.Create (Opc.Ua.ApplicationConfiguration configuration, Opc.Ua.ConfiguredEndpoint endpoint, Boolean updateBeforeConnect, System.String sessionName, UInt32 sessionTimeout, IUserIdentity identity, IList`1 preferredLocales)
script_connectOPC.Start () (at Assets/Resources/script_connectOPC.cs:47)

Has anyone on here any tips on how to connect to an OPC Server from Unity3D?  

I was getting the same error, I added this after config.Validate(ApplicationType.Client); 

ITransportChannel channel = WcfChannelBase.CreateUaBinaryChannel(config, new EndpointDescription("opc.tcp://localhost:62657"), endpointConfiguration, clientCertificate, config.CreateMessageContext());

and now I'm getting the next error:

NullReferenceException: Object reference not set to an instance of an object
Opc.Ua.Bindings.TcpTransportChannel.SaveSettings (System.Uri url, Opc.Ua.TransportChannelSettings settings) (at <881109fbf76148f0841e7c4912cf3ab4>:0)
Opc.Ua.Bindings.TcpTransportChannel.Initialize (System.Uri url, Opc.Ua.TransportChannelSettings settings) (at <881109fbf76148f0841e7c4912cf3ab4>:0)
Opc.Ua.WcfChannelBase.CreateUaBinaryChannel (Opc.Ua.ApplicationConfiguration configuration, Opc.Ua.EndpointDescription description, Opc.Ua.EndpointConfiguration endpointConfiguration, System.Security.Cryptography.X509Certificates.X509Certificate2 clientCertificate, Opc.Ua.ServiceMessageContext messageContext) (at <881109fbf76148f0841e7c4912cf3ab4>:0)

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