Isolated Property (IEasyUAClientSettings)

Specifies that you wish that the object instance works with an "isolated" connection to the OPC server, i.e. one that is not shared with other instances.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Property Isolated As Boolean

'Usage
 
Dim instance As IEasyUAClientSettings
Dim value As Boolean
 
instance.Isolated = value
 
value = instance.Isolated

bool Isolated {get; set;}

property bool Isolated {
   bool get();
   void set (    bool value);
}

Remarks

This method or property does not throw any exceptions, aside from execution exceptions such as System.Threading.ThreadAbortException or System.OutOfMemoryException.

Example

// This example shows how to create and use two isolated client objects, resulting in two separate connections to the target
// OPC UA server.

using System;
using System.Diagnostics;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples._EasyUAClient
{
    class Isolated
    {
        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 objects and make them isolated
            var client1 = new EasyUAClient { Isolated = true };
            var client2 = new EasyUAClient { Isolated = true };

            // The callback is a local method the displays the value
            void DataChangeCallback(object sender, EasyUADataChangeNotificationEventArgs eventArgs)
            {
                Debug.Assert(!(eventArgs is null));

                Console.Write($"[{eventArgs.Arguments.State}] ");
                if (eventArgs.Succeeded)
                {
                    Debug.Assert(!(eventArgs.AttributeData is null));
                    Console.WriteLine(eventArgs.AttributeData.ToString());
                }
                else
                    Console.WriteLine("*** Failure: {0}", eventArgs.ErrorMessageBrief);
            }

            Console.WriteLine("Subscribing...");
            client1.SubscribeDataChange(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000, 
                DataChangeCallback, state: 1);
            client2.SubscribeDataChange(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000,
                DataChangeCallback, state: 2);

            Console.WriteLine("Processing data change events for 10 seconds...");
            System.Threading.Thread.Sleep(10 * 1000);

            Console.WriteLine("Unsubscribing...");
            client1.UnsubscribeAllMonitoredItems();
            client2.UnsubscribeAllMonitoredItems();

            Console.WriteLine("Waiting for 2 seconds...");
            System.Threading.Thread.Sleep(2 * 1000);
        }
    }
}

# This example shows how to create and use two isolated client objects, resulting in two separate connections to the
# target OPC UA server.

# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc
import time

# Import .NET namespaces.
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.OperationModel import *


# The callback is a regular method the displays the value.
def dataChangeCallback(sender, eventArgs):
    print('[', eventArgs.Arguments.State, '] ', sep='', end='')
    if eventArgs.Succeeded:
        assert eventArgs.AttributeData is not None
        print('Value: ', eventArgs.AttributeData.Value, sep='')
    else:
        print('*** Failure: ', eventArgs.ErrorMessageBrief, sep='')


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 objects and make them isolated.
client1 = EasyUAClient()
client1.Isolated = True
client2 = EasyUAClient()
client2.Isolated = True

print('Subscribing...')
IEasyUAClientExtension.SubscribeDataChange(client1,
    endpointDescriptor,
    UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'),
    1000,
    EasyUADataChangeNotificationEventHandler(dataChangeCallback),
    1)  # state
IEasyUAClientExtension.SubscribeDataChange(client2,
    endpointDescriptor,
    UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'),
    1000,
    EasyUADataChangeNotificationEventHandler(dataChangeCallback),
    2)  # state

print('Processing data change events for 10 seconds...')
time.sleep(10)

print('Unsubscribing...')
client1.UnsubscribeAllMonitoredItems()
client2.UnsubscribeAllMonitoredItems()

print('Waiting for 2 seconds...')
time.sleep(2)

print('Finished.')

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

IEasyUAClientSettings Interface
IEasyUAClientSettings Members

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