OPC Studio User's Guide and Reference
Examples - OPC UA Services - Register and unregister multiple nodes, with connection locking

.NET

// This example shows how to register and unregister multiple nodes in an OPC UA server, and use this approach together with
// connection locking.
//
// Node registration (with OPC UA servers that support it) can improve performance with repeatedly accessed nodes.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-CSharp .
// Missing some example? Ask us for it on our Online Forums, https://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 Microsoft.Extensions.DependencyInjection;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;
using OpcLabs.EasyOpc.UA.Services;
using OpcLabs.EasyOpc.UA.Services.Extensions;

namespace UADocExamples._EasyUAClientNodeRegistration
{
    class RegisterAndUnregisterMultipleNodes
    {
        public static void Main1()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            // Instantiate the client object.
            using (var client = new EasyUAClient())
            {
                // Obtain the client node registration service.
                IEasyUAClientNodeRegistration clientNodeRegistration = client.GetRequiredService<IEasyUAClientNodeRegistration>();

                // Obtain the client connection control service.
                IEasyUAClientConnectionControl clientConnectionControl = client.GetRequiredService<IEasyUAClientConnectionControl>();

                var nodeDescriptorArray = new UANodeDescriptor[]
                {
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[0]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[4]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[8]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[12]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[16]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[20]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[24]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[28]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[32]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[36]"
                };

                Console.WriteLine("Registering nodes");
                int[] registrationHandleArray = clientNodeRegistration.RegisterMultipleNodes(endpointDescriptor, nodeDescriptorArray);

                Console.WriteLine("Locking the connection");
                // Locking the connection will attempt to open it, and when successful, the nodes will be registered with
                // the server at that time. The use of locking is not necessary, but it may bring benefits together with the
                // node registration. See the conceptual documentation for more information.
                int lockHandle = clientConnectionControl.LockConnection(endpointDescriptor);

                Console.WriteLine("Waiting for 10 seconds...");
                // The example uses this delay to demonstrate the fact that your code might have other tasks to do, before
                // it accesses the previously registered nodes.
                System.Threading.Thread.Sleep(10 * 1000);

                Console.WriteLine("Reading (1)");
                UAAttributeDataResult[] resultArray1 = client.ReadMultiple(endpointDescriptor, nodeDescriptorArray);
                foreach (UAAttributeDataResult result in resultArray1)
                    Console.WriteLine(result);

                Console.WriteLine("Reading (2)");
                UAAttributeDataResult[] resultArray2 = client.ReadMultiple(endpointDescriptor, nodeDescriptorArray);
                foreach (UAAttributeDataResult result in resultArray2)
                    Console.WriteLine(result);

                Console.WriteLine("Unlocking the connection");
                clientConnectionControl.UnlockConnection(lockHandle);

                Console.WriteLine("Unregistering nodes");
                clientNodeRegistration.UnregisterMultipleNodes(registrationHandleArray);

                Console.WriteLine("Finished.");
            }
        }
    }
}

' This example shows how to register and unregister multiple nodes in an OPC UA server, and use this approach together with
' connection locking.
'
' Node registration (with OPC UA servers that support it) can improve performance with repeatedly accessed nodes.
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBNET .
' Missing some example? Ask us for it on our Online Forums, https://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.

Imports Microsoft.Extensions.DependencyInjection
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.OperationModel
Imports OpcLabs.EasyOpc.UA.Services
Imports OpcLabs.EasyOpc.UA.Services.Extensions

Namespace _EasyUAClientNodeRegistration
    Friend Class RegisterAndUnregisterMultipleNodes
        Public Shared Sub Main1()
            Dim endpointDescriptor As UAEndpointDescriptor =
                    "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
            ' or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            ' or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            ' Instantiate the client.
            Using client = New EasyUAClient()
                ' Obtain the client node registration service.
                Dim clientNodeRegistration As IEasyUAClientNodeRegistration = client.GetRequiredService(Of IEasyUAClientNodeRegistration)

                ' Obtain the client connection control service.
                Dim clientConnectionControl As IEasyUAClientConnectionControl = client.GetRequiredService(Of IEasyUAClientConnectionControl)

                Dim nodeDescriptorArray = New UANodeDescriptor() {
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[0]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[4]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[8]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[12]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[16]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[20]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[24]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[28]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[32]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[36]"
                }

                Console.WriteLine("Registering nodes")
                Dim registrationHandleArray() As Integer = clientNodeRegistration.RegisterMultipleNodes(endpointDescriptor, nodeDescriptorArray)

                Console.WriteLine("Locking the connection")
                ' Locking the connection will attempt to open it, and when successful, the nodes will be registered with
                ' the server at that time. The use of locking is not necessary, but it may bring benefits together with the
                ' node registration. See the conceptual documentation for more information.
                Dim lockHandle As Integer = clientConnectionControl.LockConnection(endpointDescriptor)

                Console.WriteLine("Waiting for 10 seconds...")
                ' The example uses this delay to demonstrate the fact that your code might have other tasks to do, before
                ' it accesses the previously registered nodes.
                System.Threading.Thread.Sleep(10 * 1000)

                Console.WriteLine("Reading (1)")
                Dim resultArray1() As UAAttributeDataResult = client.ReadMultiple(endpointDescriptor, nodeDescriptorArray)
                For Each result As UAAttributeDataResult In resultArray1
                    Console.WriteLine(result)
                Next result

                Console.WriteLine("Reading (2)")
                Dim resultArray2() As UAAttributeDataResult = client.ReadMultiple(endpointDescriptor, nodeDescriptorArray)
                For Each result As UAAttributeDataResult In resultArray2
                    Console.WriteLine(result)
                Next result

                Console.WriteLine("Unlocking the connection")
                clientConnectionControl.UnlockConnection(lockHandle)

                Console.WriteLine("Unregistering nodes")
                clientNodeRegistration.UnregisterMultipleNodes(registrationHandleArray)

                Console.WriteLine("Finished.")
            End Using
        End Sub
    End Class
End Namespace

Python

# This example shows how to register and unregister multiple nodes in an OPC UA server, and use this approach together
# with connection locking.
#
# Node registration (with OPC UA servers that support it) can improve performance with repeatedly accessed nodes.
#
# Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
# OPC client and subscriber examples in Python on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-Python .
# Missing some example? Ask us for it on our Online Forums, https://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.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc
import time

# Import .NET namespaces.
from Microsoft.Extensions.DependencyInjection import *
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.OperationModel import *
from OpcLabs.EasyOpc.UA.Services import *
from OpcLabs.EasyOpc.UA.Services.Extensions import *


endpointDescriptor = UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer')
# or 'http://opcua.demo-this.com:51211/UA/SampleServer' (currently not supported)
# or 'https://opcua.demo-this.com:51212/UA/SampleServer/'

# Instantiate the client object.
client = None
try:
    client = EasyUAClient()

    # Obtain the client connection monitoring service.
    clientNodeRegistration = ServiceProviderServiceExtensions.GetRequiredService[IEasyUAClientNodeRegistration](client)
    if clientNodeRegistration is None:
        print('The client connection monitoring service is not available.')
        exit()

    # Obtain the client connection control service.
    clientConnectionControl = ServiceProviderServiceExtensions.GetRequiredService[IEasyUAClientConnectionControl](client)
    if clientConnectionControl is None:
        print('The client connection control service is not available.')
        exit()

    nodeDescriptorArray = [
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[0]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[4]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[8]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[12]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[16]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[20]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[24]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[28]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[32]'),
        UANodeDescriptor('nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[36]'),
    ]

    print('Registering nodes')
    registrationHandleArray = IEasyUAClientNodeRegistrationExtension.RegisterMultipleNodes(clientNodeRegistration,
                                                                                           endpointDescriptor,
                                                                                           nodeDescriptorArray)

    print('Locking the connection')
    # Locking the connection will attempt to open it, and when successful, the nodes will be registered with
    # the server at that time. The use of locking is not necessary, but it may bring benefits together with the
    # node registration. See the conceptual documentation for more information.
    lockHandle = clientConnectionControl.LockConnection(endpointDescriptor)

    print('Waiting for 10 seconds...')
    # The example uses this delay to demonstrate the fact that your code might have other tasks to do, before
    # it accesses the previously registered nodes.
    time.sleep(10)

    print('Reading (1)')
    attributeDataResultArray1 = IEasyUAClientExtension.ReadMultiple(client, endpointDescriptor, nodeDescriptorArray)
    for attributeDataResult in attributeDataResultArray1:
        print(attributeDataResult)

    print('Reading (2)')
    attributeDataResultArray2 = IEasyUAClientExtension.ReadMultiple(client, endpointDescriptor, nodeDescriptorArray)
    for attributeDataResult in attributeDataResultArray2:
        print(attributeDataResult)

    print('Unlocking the connection')
    clientConnectionControl.UnlockConnection(lockHandle)

    print('Unregistering nodes')
    clientNodeRegistration.UnregisterMultipleNodes(registrationHandleArray)

    print('Finished.')

finally:
    client and client.Dispose()

 

See Also
Examples - OPC UA Services - Lock and unlock a connection

Concepts

OPC UA Node Registration Service
QuickOPC Component Services
QuickOPC Operation Control Services

Examples - Client OPC UA Specialized

Examples - OPC UA Specialized - Unified Automation UA .NET SDK Bundle - Register and unregister nodes

 

 

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