OPC UA .NET SDK code don't run in Unity player and windows build

Hi all,

I'm trying to run this code in Unity, based in this thread, adapted for Unity. The code works if compiled in Visual Studio (It can communicate to an OPC server correctly), but in Unity I get this exception when running it:

The script adapted to Unity is:

Code (CSharp):

1.  
2. public class OpcClient : MonoBehaviour {
3.     private string log;
4.  
5.     private void Start() {
6.         Log("Step 1 - Create a config.");
7.         var config = new ApplicationConfiguration() {
8.             ApplicationName = "test-opc",
9.             ApplicationType = ApplicationType.Client,
10.             SecurityConfiguration = new SecurityConfiguration { ApplicationCertificate = new CertificateIdentifier { StoreType = @"Windows", StorePath = @"CurrentUser\My", SubjectName = Utils.Format(@"CN={0}, DC={1}", "OpcClient", "localhost") }, TrustedPeerCertificates = new CertificateTrustList { StoreType = @"Windows", StorePath = @"CurrentUser\TrustedPeople", }, NonceLength = 32, AutoAcceptUntrustedCertificates = true },
11.             TransportConfigurations = new TransportConfigurationCollection(),
12.             TransportQuotas = new TransportQuotas { OperationTimeout = 15000 },
13.             ClientConfiguration = new ClientConfiguration { DefaultSessionTimeout = 60000 }
14.         };
15.         config.Validate(ApplicationType.Client);
16.         if (config.SecurityConfiguration.AutoAcceptUntrustedCertificates) {
17.             config.CertificateValidator.CertificateValidation += (s, e) => { e.Accept = (e.Error.StatusCode == StatusCodes.BadCertificateUntrusted); };
18.         }
19.  
20.         Log("Step 2 - Create a session with your server.");
21.         using (var session = Session.Create(config, new ConfiguredEndpoint(null, new EndpointDescription("opc.tcp://localhost:4841")), true, "", 60000, null, null)) {
22.             Log("Step 3 - Browse the server namespace.");
23.             ReferenceDescriptionCollection refs;
24.             byte[] cp;
25.             session.Browse(null, null, ObjectIds.ObjectsFolder, 0u, BrowseDirection.Forward, ReferenceTypeIds.HierarchicalReferences, true, (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, out cp, out refs);
26.             Log("DisplayName: BrowseName, NodeClass");
27.             foreach (var rd in refs) {
28.                 Log(rd.DisplayName + ": " + rd.BrowseName + ", " + rd.NodeClass);
29.                 ReferenceDescriptionCollection nextRefs;
30.                 byte[] nextCp;
31.                 session.Browse(null, null, ExpandedNodeId.ToNodeId(rd.NodeId, session.NamespaceUris), 0u, BrowseDirection.Forward, ReferenceTypeIds.HierarchicalReferences, true, (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, out nextCp, out nextRefs);
32.                 foreach (var nextRd in nextRefs) {
33.                     Log("+ " + nextRd.DisplayName + ": " + nextRd.BrowseName + ", " + nextRd.NodeClass);
34.                 }
35.             }
36.  
37.             Log("Step 4 - Create a subscription. Set a faster publishing interval if you wish.");
38.             var subscription = new Subscription(session.DefaultSubscription) { PublishingInterval = 1000 };
39.  
40.             Log("Step 5 - Add a list of items you wish to monitor to the subscription.");
41.             var list = new List<MonitoredItem> {
42.                 new MonitoredItem(subscription.DefaultItem) { DisplayName = "aaatime", StartNodeId = "i=10004" } };
43.             list.ForEach(i => i.Notification += OnNotification);
44.             subscription.AddItems(list);
45.  
46.             Log("Step 6 - Add the subscription to the session.");
47.             session.AddSubscription(subscription);
48.             subscription.Create();
49.  
50.             Log("Finished client initialization");
51.         }
52.     }
53.  
54.     private static void OnNotification(MonitoredItem item, MonitoredItemNotificationEventArgs e) {
55.         foreach (var value in item.DequeueValues()) {
56.             Console.WriteLine("{0}: {1}, {2}, {3}", item.DisplayName, value.Value, value.SourceTimestamp, value.StatusCode);
57.         }
58.     }
59. }
60.  

 

I have the exact same issue. Did you by any chance managed to fix this problem? I tried everything to my knowledge with certificates.
I'm using the Unity 5.5 beta with the 4.6 .NET framework.

 

Hi, AKiSeY,

I've returned to that code now, and found that the only change I did was at the application configuration:

Code (CSharp):

1. var config = new ApplicationConfiguration() {
2.     ApplicationName = "test-opc",
3.     ApplicationType = ApplicationType.Client,
4.     SecurityConfiguration = new SecurityConfiguration { ApplicationCertificate = new CertificateIdentifier() },//  { StoreType = @"Windows", StorePath = @"CurrentUser\My", SubjectName = Utils.Format(@"CN={0}, DC={1}", "OpcClient", "localhost") }, TrustedPeerCertificates = new CertificateTrustList { StoreType = @"Windows", StorePath = @"CurrentUser\TrustedPeople", }, NonceLength = 32, AutoAcceptUntrustedCertificates = true },
5.     TransportConfigurations = new TransportConfigurationCollection(),
6.     TransportQuotas = new TransportQuotas { OperationTimeout = 15000 },
7.     ClientConfiguration = new ClientConfiguration { DefaultSessionTimeout = 60000 }
8. };

Nevertheless, I think the major problem was in the library version. Unity compiles code using .NET 3.5, so you should be using version 1.02.334.6, available as Visual Studio source-code project, at https://opcfoundation.org/developer...chitecture/net-stack-and-sample-applications/ at “Archives” tab.

I've tested at Unity 5.4.1.

 

Hi,
Can you tell me if the above code actually connects to the opcserver? I tried the code with unity 541 express & 543 express, opc runtime 1.02.334.6 .netfm3.5. Both giving me the exception 'error establishing a connection'. No compiler or other errors. When I put the opc client code in a .netfm3.5 console application its works fine. Why won't the exact same code with the same .netfm3.5 runtime not connect from unity?

 

Hi Brunoleos,

Thank you for the code sample, it helped me to get past the certificate error. Unfortunately I am now stuck a few line below with the folowing error: ServiceResultException: Error establishing a connection.
It happens when I call this line: using (Session session = Session.Create(config, new ConfiguredEndpoint(null, new EndpointDescription(TextLines[0])), true, "", 60000, null, null))
I use KepwareEX for the server. Maybe you got stuck here aswell at any point?

Did you manage to make a connection correctly and exchange the data from the OPC server to Unity?

 

I can't get past this point either. I hope someone has an idea how to fix this.

 

I had no problems at the session creation. Could it be a problem with your OPC server? Maybe try running the code from the Microsoft compiler, as the implementation is different from Unity's.

 

I downloaded the archive you mentioned in you reply. I was wondering which files you copied to your Unity project so that you can use the namespaces required to make the connection work. for example Opc.ua.Client
The client gave me those as dll files, but compiled in .NET 4.5
I hope you can tell me, that would be of great help.
Thanks!

 

@AKiSeY,

I have Opc.Ua.Core.dll and Opc.Ua.Client.dll in my Plugins folder.

 

You should use OPCfoundation version 1.02.334.6. This version is built on dotnet 3.5. It compiles fine with Unity. Unfortunatly this version starts a connect attemp but fails with the exception 'error establishing a connection'.When using the same code in a console app outside of unity the connection with the samer serer works fine. There is a block within unity. Should the code be called from elsewhere then under the maincamera?

 

I call the code from Start() of my MonoBehaviour, attached to a empty GameObject of the scene. At the Update() I handle a key event and send something to the server. It works.

When my server is disconnected, I also receive "ServiceResultException: Error establishing a connection." at Unity.

I would suggest to investigate the server behaviour, but as your code runs outside Unity, then I don't know.

 

I made a Empty gameobject and posted the following code in it. The result is 'error establishing a connection'. From a wireshark log I see that the client (Unity) stops connecting. Cant tell why. The very same code in a console app works fine. this is the code;

using UnityEngine;

using System.Collections;

using Opc.Ua;

using Opc.Ua.Client;

using System;

using System.Threading;

publicclassOpcClient : MonoBehaviour

{



ApplicationConfiguration _configuration;

// OPC UA session is there when a connection is active

Session _session;

privatevoidStart()

{

_configuration = newApplicationConfiguration()

{

ApplicationName = "UnityOpcClient",

ApplicationType = ApplicationType.Client,

SecurityConfiguration = newSecurityConfiguration { ApplicationCertificate = newCertificateIdentifier() },// { StoreType = @"Windows", StorePath = @"CurrentUser\My", SubjectName = Utils.Format(@"CN={0}, DC={1}", "OpcClient", "localhost") }, TrustedPeerCertificates = new CertificateTrustList { StoreType = @"Windows", StorePath = @"CurrentUser\TrustedPeople", }, NonceLength = 32, AutoAcceptUntrustedCertificates = true },

TransportConfigurations = newTransportConfigurationCollection(),

TransportQuotas = newTransportQuotas { OperationTimeout = 15000 },

ClientConfiguration = newClientConfiguration { DefaultSessionTimeout = 60000 }

};

_configuration.Validate(ApplicationType.Client);

_configuration.SecurityConfiguration.AutoAcceptUntrustedCertificates = true;

if (_configuration.SecurityConfiguration.AutoAcceptUntrustedCertificates)

{

_configuration.CertificateValidator.CertificateValidation += (s, e) => { e.Accept = (e.Error.StatusCode == StatusCodes.BadCertificateUntrusted); };

}

try

{

_session = Session.Create(_configuration, newConfiguredEndpoint(null, newEndpointDescription("opc.tcp://localhost:62541/Server")), true, "", 60000, null, null);

}

catch (Exception e)

{

Debug.Log(e.Message);

if (e.InnerException != null)

Debug.Log(e.InnerException.Message);

}

}



// Update is called once per frame

voidUpdate()

{

}

}

 

i have a problem using the code. 'SecurityConfiguration' does not contain a definition for 'AutoAcceptUntrustedCertificates' and no extension method 'AutoAcceptUntrustedCertificates' accepting a first argument of type 'SecurityConfiguration' could be found (are you missing a using directive or an assembly reference?) Can you help me resolving this problem Regards

 

i have a problem using the code. 'SecurityConfiguration' does not contain a definition for 'AutoAcceptUntrustedCertificates' and no extension method 'AutoAcceptUntrustedCertificates' accepting a first argument of type 'SecurityConfiguration' could be found (are you missing a using directive or an assembly reference?) Can you help me resolving this problem Regards

 

Check at your "usings" if you include:

Code (CSharp):

1. using Opc.Ua;
2. using Opc.Ua.Client;

Also, make sure you are using version 1.02.334.6 of OPC framework.

 

Thank you it works but now i have another problem , i can not establish connection between unity and the server , what should i put in Update () ? i am using the version 1.02.334.6 of OPC framework.

 

Thank you it works but now i have another problem , i can not establish connection between unity and the server , what should i put in Update () ? i am using the version 1.02.334.6 of OPC framework

 

For the connection, nothing goes at Update(). All steps are at Start().

I got no problems establishing the connection, but other users in this thread did. They haven't reported solutions.

 

ok do you only use a script C# in unity 3D ? or should i configure further informations ?

 

That script does the connection part of OPC. You can put everything in a single script, it's gonna work.

Make sure you also have the needed DLLs in your project.

 

i put the Dlls Opc.Ua.Core.dll and Opc.Ua.Client.dll in library folder of the project .is that right ?
this is a picture of the error i have

 

The DLLs usually go to the Assets/Plugins folder.

It seems the error you got is the same as Akinsey's. I don't know what is the cause, maybe a server side problem.

 

Hi guys!
I'm am very new to OPC Ua, and i'm trying to create an OPC Client into Unity3D, and to create a test OPC server to see if it works. Do you have some links or some steps to follow (or simple tutorials) to help me? Thank you by advance

 

The first post in this thread is a good starting point. It links to a minimal C# sample code for an OPC UA client. I've adapted it to run inside Unity.

You will need an OPC server to communicate to the client. It is dependent on the application.

I've also used UaExpert, an OPC UA client, to test the communication to the server, to validate the Unity's client.

 

Hey!
I'm happy I'm not the only one trying to figure this out. This thread sounds very promising.
I've tried to follow your steps and I've downloaded version 1.02.334.6 and built the Opc.Ua.Core.dll and Opc.Ua.Client.dll from the Solutions provided in the root Folder.
However, if I create a new & empty unity Project (5.6) and put those .dlls into a freshly created Plugins Folder, I get this error message when trying to build the (otherwise empty) project: "ArgumentException: The Assembly System.IdentityModel is referenced by Opc.Ua.Core (...)"

Did I miss something? Do I have to alter the solution and somehow remove the System.IdentityModel directive before Building the solution?

 

Could you paste the full error message? I can run with Unity 5.5.2f2. Maybe you should set the API compatibility level to .NET 2.0 at Player Settings > Other settings > Optimization. This could solve the problem if System.IdentityModel is not part of the subset.

 

Thanks for your fast Response!
Indeed, your tip made Building from unity possible! So that's cool. However, I still get a warning:

Other than that, I'm facing the same connection issue others faced before me in this thread. Starting the Code from console works just fine, but in Unity I get this Connection error.

Perhaps it has to do with the error/warning I receive upon Building the Project?

If anyone has found a solution to this, I would be super happy to hear it!

Edit: Because I'm desperate, I just tried it using Unity 5.5.2 but it didn't work regardless.

 

I'm glad to be partially helpful, but about that error I don't know the cause.

 

I gues noone solved this problem yet?
I have the same problem. Connectiong from a Console Application works like a charm,
sadly not from Unity.
Are there any alternatives to this opc framework that work in dot net 3.5?

 

Sadly, I didn't. Using opc ua.net, I created a console app to serve as a Bridge between unity and opc.
There is another Framework called "Unified Automation" that works in .NET 3.5. However, I had similar Connection issues when I tried using it in Unity. It Looks like Unity would somehow shut down the Connection attempt.

 

Just for your information:
Yes this does not work out of the Editor.
But!
If you compile it down to UWP it works fine.

 

Hello,

i am using the similar code for Opc client and having a strange error, checked with debugging the call goes to creating session and then it gives the error. any clue why its happening ?

 

i am also having the similar error of any clue ? i am using unity 2017.0.2 with .net 4.6 support.

 

Has anyone had recent success with this? I'm trying to achieve an OPC to Unity3D connection but have come up short. Any help would be greatly appreciated

 

I'm having the same 'error estabilishing connection' issue as many here. I would just like to add that on the server I get the following log when Unity tries to connect:

Code (CSharp):

1. OpcUa_TcpListener_ConnectionManager_GetConnectionByHandle: Connection with id 0 not usable!
2. OpcUa_TcpListener_CloseConnection: Connection 00010000 not found.

 

Has any one advanced with the conection issue?, i'm stucked on that and would appreciate any help.

 

The solution I came up with back then was to create a simple c# console app that would serve as a udp bridge between Unity and OPC. I'm not sure if by now (one year later) there is a way to establish a direct connection between the two. Naturally, the bridge app does add a tiny bit of latency. But if that's not a deal breaker, I would suggest going that route.

 

@lauchsuppe I went down that path too. The issue that I found was the inability of Unity to find the necessaryassembly files from the .NET GAC. This was the limitation to every approach I tried to apply in unity. And you can't just dump the necessary .dll files in there either since the OPC Foundation components cannot operate outside of the GAC. So the only way this method could ever work is if you could point unity to the windows directory to find the appropriate assembly files.

 

I had the same problem, and looked everywhere for an answer.
I managed to get it working by also making a 'bridge' between the OPC-server and the Hololens application via an UDP connection.

 

I have an equal code, except when creating the nodes, but even if you put yours, it does not go into OnNotification.
Some help?

 

I am creating a .cs Script in Unity and pasting the Code from the first Post:

using Opc.Ua;

using Opc.Ua.Client;

using Opc.Ua.Configuration;

Those packages are unknown. In Visual Studio I try to install the nuget

OPCFoundation.NetStandard.Opc.Ua

But I get this error:

Severity    Code    Description    Project    File    Line    Suppression State

Error        Could not install package 'OPCFoundation.NetStandard.Opc.Ua 1.4.353.15'. You are trying to install this package into a project that targets '.NETFramework,Version=v3.5,Profile=Unity Full v3.5', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

I tried every Version available in the nuget manager. same error.

Than I tried to download the packages from @brunoleos Link (https://opcfoundation.org/developer...chitecture/net-stack-and-sample-applications/) There you have in the nuget folder:

Opc.Ua.nuspec

and

Opc.Ua.Symbols.nuspec

those two files, which I tried to install with the dotnet CLI like this:

dotnet add package Opc.Ua.Symbols.nuspec

inside of my unity project (where the sln file is).

This didn't work with the following error:

error: Fehler beim Hinzufügen des Pakets "Opc.Ua.Symbols.nuspec" zum Projekt "C:\Users\HideThePainHarold\ims\HolographicAcademy-Holograms-101\Origami.csproj". Das Projekt bietet keine Unterstützung für das Hinzufügen von Paketverweisen über den Befehl zum Hinzufügen von Paketen.

It is in German and says: Nice try! (or your project doesnt provide support for adding packages)

So than I installed NuGetForUnity to install the NuGet inside of Unity. Didn't help.

Downloaded opc.ua.netstandard.sampleapplications-20180714 and added
-Opc.Ua.Client.dll
-Opc.Ua.Configuration.dll
-Opc.Ua.Core.dll
to Unity in the Assets/Packages and also clicked on it and applied as UWP/ DotNet.

Here I am with this... I tried so hard and got so far but in the end it doesn't even matter:

Assets/Scripts/OPC.cs(2,7): error CS0246: The type or namespace name `Opc' could not be found. Are you missing an assembly reference?

I just want to have a very very very simple OPC client for reading a variable from my OPC UA Node.js Server.

 

OK the most errors I had, they were because of the different Versions. In Unity I had in the player settings the .Net Version 3.5; than I changed to 4.5 and had a big mess. I restarted a new Project. And solved every error, also changed the function calls to the new OPC library which is now asynchronous, except this one error:

Assets/OPC.cs(27,20): error CS0012: The type `System.IdentityModel.Selectors.X509CertificateValidator' is defined in an assembly that is not referenced. Consider adding a reference to assembly `System.IdentityModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

27,20 is this line:

 config.CertificateValidator.CertificateValidation += (s, e) => { e.Accept = (e.Error.StatusCode == StatusCodes.BadCertificateUntrusted); };

The error in Unity3D says

 'The type `System.IdentityModel.Selectors.X509CertificateValidator' is defined in an assembly that is not referenced.' 

But in Visual Studio, when I do >Go to Definition F12, it jumps to

Opc.Ua.CertificateValidator 

... so it is installed right and it can be found.

I am almost there! We will do it! Thank you guys!

 

Hello everyone, I'm a newbie in here. Now, I can't find the version 1.02.334.6 of OPC framework.
Is the anyone can give 2 file: Opc.Ua.Core.dll and Opc.Ua.Client.dll in .NET 3.5?
Thank you so much

 

Hello, I am trying the same. Does anybody has successfull used Opc.Ua.Client.dll within Unity (without writing a bridge application)?

Thanks

 

Hi, we get it know running based on a commercial opc ua solution. We did not get it running based on the OPC UA Foundation framework. We are going to put our solution into the Unity Asset Store in a few weeks. It will be an optional add-on to our game4automation framework - see https://game4automation.com/

 

Hi all, our soultuion OPCUA4Unity is now availalbe on the Asset Store. It gives you an easy solution for using OPC UA communication to industrial devices within Unity. You can find it here: https://assetstore.unity.com/packages/slug/143980

 

Hi,in2sight,
Can this work in unity 2017.4.13f1? My Hololens project was developed using Unity2017.4.13f1.
If it works, I want to buy one.

 

Hi currently it works only with Mona and not with ILCPP. This means that Hololens is not possible yet. We try to find a solution.

 

Did you find a solution?

 

Hi OPCUA in current release is working with Mono and ILCPP with Unity Version 2018.4.8 LTS. It compiles on Android, Windows, IOS. But customers were so far not capable in compiling it on Hololens. We are waiting for our Hololens2 Device (what we hopefully receive soon) to be able to test it ourselves.