Hello.
I do not not understand your post.

The example works for me without error. Are you saying that it does not work for you?

Or, if you are using a different code, post the code here.

Regards

Hello.

I do not know what you mean by NamespaceId, no such term is used in OPC UA.

The proper way way is to specify namespaces in OPC UA is using their namespace URIs. Unfortunately, the Web is full of examples that use namespace indexes, which (except for namespaces 0 and 1) is server free to shuffle between sessions, so all these examples are technically wrong. Also, the "standard" OPC UA browse path syntax uses namespace indexes, so it is not usable without having a context - which index corresponds to which URI.

In the code I provided, there are three example with equivalent effect. The first one, and the subsequent (commented out) one use namespace URIs.
The last one uses namespace indexes. It is close to what you have asked for in your original post, and you are free to use it, but be that "namespace with index 2" is not a stable thing. The first two examples do not have this problem.


Regards

Hello.

In QuickOPC, nodes can be specified either by their node ID, or by an absolute browse path (a combination of a starting node, and a relative browse path). The conversion from the browse path to the node Id happens automatically inside QuickOPC, you do not call anything extra.

Example:

 

// This example shows how to read the node using a browse path.

//

// Find all latest examples here: opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .

// OPC client and subscriber examples in C# on GitHub: github.com/OPCLabs/Examples-QuickOPC-CSharp .

// Missing some example? Ask us for it on our Online Forums, www.opclabs.com/forum/index ! You do not have to own

// a commercial license in order to use Online Forums, and we reply to every post.

 

using System;

using OpcLabs.EasyOpc.UA;

using OpcLabs.EasyOpc.UA.Navigation;

using OpcLabs.EasyOpc.UA.OperationModel;

 

namespace UADocExamples._EasyUAClient

{

  partial class Read

  {

    public static void BrowsePath()

    {

      UAEndpointDescriptor endpointDescriptor =

        "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";

      // or "opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)

      // or "opcua.demo-this.com:51212/UA/SampleServer/"

 

      // Instantiate the client object.

      var client = new EasyUAClient();

 

      // Create the node descriptor by parsing an absolute browse path.

      // The syntax below specifies a common default namespace URI for the elements of the browse path.

      UANodeDescriptor nodeDescriptor = UABrowsePath.Parse("[ObjectsFolder]/Data/Dynamic/Scalar/FloatValue", "test.org/UA/Data/");

 

      // Alternatively, the namespace URIs can be specified with each element of the browse separately.

      //UANodeDescriptor nodeDescriptor = UABrowsePath.Parse("[ObjectsFolder]/[nsu=http://test.org/UA/Data/;Data]/[nsu=http://test.org/UA/Data/;Dynamic]/[nsu=http://test.org/UA/Data/;Scalar]/[nsu=http://test.org/UA/Data/;FloatValue]", null);

 

      // Alternatively, the namespaces can be specified by indexes, separately with each element.

      //UANodeDescriptor nodeDescriptor = UABrowsePath.Parse("[ObjectsFolder]/2:Data/2:Dynamic/2:Scalar/2:FloatValue", null);

 

      // Obtain attribute data. By default, the Value attribute of a node will be read.

      UAAttributeData attributeData;

      try

      {

        attributeData = client.Read(endpointDescriptor, nodeDescriptor);

      }

      catch (UAException uaException)

      {

        Console.WriteLine($"*** Failure: {uaException.GetBaseException().Message}");

        return;

      }

 

      // Display results

      Console.WriteLine($"Value: {attributeData.Value}");

      Console.WriteLine($"ServerTimestamp: {attributeData.ServerTimestamp}");

      Console.WriteLine($"SourceTimestamp: {attributeData.SourceTimestamp}");

      Console.WriteLine($"StatusCode: {attributeData.StatusCode}");

    }

  }

}

 

 

I hope this helps
Best regards