Examples - Server OPC UA - Complete the write operation asynchronously

.NET

// This example shows how to indicate that the write operation completes asynchronously. This is an example of the push
// data consumption model.
// You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. 
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
// OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-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 System.Threading;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.NodeSpace;

namespace UAServerDocExamples._UADataVariable
{
    partial class WriteFunction
    {
        public static void GoodCompletesAsynchronously()
        {
            // Instantiate the server object.
            // By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            var server = new EasyUAServer();

            // Create a writable data variable and add a function that will be called when the data variable is written to.
            // The function returns a status code that indicates the outcome of the Write operation. Since we do not know the
            // true outcome of the write operation at the time of the function call, we return status code
            // "GoodCompletesAsynchronously".
            server.Add(new UADataVariable("WriteToThisVariable").WriteFunction<int>(
                data =>
                {
                    // The actual write operation is performed asynchronously, on a separate thread.
                    var thread = new Thread(() => Console.WriteLine($"Attribute data written: {data}"));
                    thread.Start();

                    return UACodeBits.GoodCompletesAsynchronously;
                }));

            // Start the server.
            Console.WriteLine("The server is starting...");
            server.Start();

            Console.WriteLine("The server is started.");
            Console.WriteLine("Any value written to the example data variable will be displayed on the console.");
            Console.WriteLine();

            // Let the user decide when to stop.
            Console.WriteLine("Press Enter to stop the server...");
            Console.ReadLine();

            // Stop the server.
            Console.WriteLine("The server is stopping...");
            server.Stop();

            Console.WriteLine("The server is stopped.");
        }
    }
}

# This example shows how to indicate that the write operation completes asynchronously. This is an example of the push
# data consumption model.
# You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. 
#
# Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
# OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-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.

#requires -Version 5.1
using namespace System.Threading
using namespace OpcLabs.EasyOpc.UA
using namespace OpcLabs.EasyOpc.UA.Generic
using namespace OpcLabs.EasyOpc.UA.NodeSpace
using namespace OpcLabs.PowerShellManagement

# The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows .
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.ServerOpcUAComponents.dll"
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.PowerShellManagement.dll"

# Instantiate the server object.
# By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
$server = New-Object EasyUAServer

# Create a writable data variable and add a function that will be called when the data variable is written to.
# The function returns a status code that indicates the outcome of the Write operation. Since we do not know the
# true outcome of the write operation at the time of the function call, we return status code
# "GoodCompletesAsynchronously".
$server.Add([UADataVariableExtension]::WriteFunction((New-Object UADataVariable("WriteToThisVariable")), 
    [RunspacedDelegateFactory]::NewRunspacedDelegate([System.Func[UAAttributeData[int], UAStatusCode]]{ 
        param($data)
        # The actual write operation is performed asynchronously, on a separate thread.
        $timer = New-Object Timers.Timer -property @{ 
                AutoReset = $false
                Interval = 10
        }
        Register-ObjectEvent -InputObject $timer -EventName Elapsed -Action { 
            Write-Host "Attribute data written: $($Event.MessageData)"
        } -MessageData $data
        $timer.Start()
        return [UACodeBits]::GoodCompletesAsynchronously
    })))

# Start the server.
Write-Host "The server is starting..."
$server.Start()

Write-Host "The server is started."
Write-Host

# Let the user decide when to stop.
Write-Host "Press Enter to stop the server..."
while(![System.Console]::KeyAvailable) { Start-Sleep -Milliseconds 20 }
[void][System.Console]::ReadKey()

# Stop the server.
Write-Host "The server is stopping..."
$server.Stop()

Write-Host "The server is stopped."

' This example shows how to indicate that the write operation completes asynchronously. This is an example of the push
' data consumption model.
' You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. 
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-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 System
Imports System.Threading
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.NodeSpace

Namespace Global.UAServerDocExamples._UADataVariable
    Partial Friend Class WriteFunction
        Shared Sub GoodCompletesAsynchronously()
            ' Instantiate the server object.
            ' By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            Dim server = New EasyUAServer()

            ' Create a writable data variable and add a function that will be called when the data variable is written to.
            ' The function returns a status code that indicates the outcome of the Write operation. Since we do not know the
            ' true outcome of the write operation at the time of the function call, we return status code
            ' "GoodCompletesAsynchronously".
            server.Add(New UADataVariable("WriteToThisVariable").WriteFunction(Of Integer)(
                Function(data)
                    ' The actual write operation Is performed asynchronously, on a separate thread.
                    Dim thread = New Thread(Sub() Console.WriteLine($"Attribute data written: {data}"))
                    thread.Start()

                    Return UACodeBits.GoodCompletesAsynchronously
                End Function
                ))


            ' Start the server.
            Console.WriteLine("The server is starting...")
            server.Start()

            Console.WriteLine("The server is started.")
            Console.WriteLine("Any value written to the example data variable will be displayed on the console.")
            Console.WriteLine()

            ' Let the user decide when to stop.
            Console.WriteLine("Press Enter to stop the server...")
            Console.ReadLine()

            ' Stop the server.
            Console.WriteLine("The server is stopping...")
            server.Stop()

            Console.WriteLine("The server is stopped.")
        End Sub
    End Class
End Namespace

OPC Wizard

OPC Wizard Push Data Consumption Model