// This example shows how to update the read value in the push data provision model. In this model, your code pushes the
// data into the edge node or device, and the edge node or device then makes the data available over Sparkplug.
//
// You can use any Sparkplug application, including our SparkplugCmd utility and the SparkplugApplicationConsoleDemo
// program, to subscribe to the edge node data.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
// Sparkplug 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 OpcLabs.EasySparkplug;
using System;
using Timer = System.Timers.Timer;
namespace SparkplugDocExamples.EdgeNode._SparkplugMetric
{
class UpdateReadData
{
static public void Main1()
{
// Note that the default port for the "mqtt" scheme is 1883.
var hostDescriptor = new SparkplugHostDescriptor("mqtt://localhost");
// Instantiate the edge node object and hook events.
var edgeNode = new EasySparkplugEdgeNode(hostDescriptor, "easyGroup", "easySparkplugDemo");
edgeNode.SystemConnectionStateChanged += (sender, eventArgs) =>
{
// Display the new connection state (such as when the connection to the broker succeeds or fails).
Console.WriteLine($"{nameof(EasySparkplugEdgeNode.SystemConnectionStateChanged)}: {eventArgs}");
};
// Create a read-only data metric.
var metric = SparkplugMetric.CreateIn(edgeNode, "ReadThisMetric")
.ValueType<int>()
.Writable(false);
// Create a timer for pushing the data to the metric. In a real edge node or device, the activity may also come
// from other sources.
var timer = new Timer
{
Interval = 1000, // 1 second
AutoReset = true,
};
// Set the read data of the metric to a random value whenever the timer interval elapses.
var random = new Random();
timer.Elapsed += (sender, args) => metric.UpdateReadData(random.Next());
timer.Start();
// Start the edge node.
Console.WriteLine("The edge node is starting...");
edgeNode.Start();
Console.WriteLine("The edge node is started.");
Console.WriteLine();
// Let the user decide when to stop.
Console.WriteLine("Press Enter to stop the edge node...");
Console.ReadLine();
// Stop the edge node.
Console.WriteLine("The edge node is stopping...");
edgeNode.Stop();
Console.WriteLine("The edge node is stopped.");
// Stop the timer.
timer.Stop();
}
}
}
' This example shows how to update the read value in the push data provision model. In this model, your code pushes the
' data into the edge node or device, and the edge node or device then makes the data available over Sparkplug.
'
' You can use any Sparkplug application, including our SparkplugCmd utility and the SparkplugApplicationConsoleDemo
' program, to subscribe to the edge node data.
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
' Sparkplug 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.
Imports OpcLabs.EasySparkplug
Imports Timer = System.Timers.Timer
Namespace Global.SparkplugDocExamples.EdgeNode._SparkplugMetric
Class UpdateReadData
Public Shared Sub Main1()
' Note that the default port for the "mqtt" scheme is 1883.
Dim hostDescriptor = New SparkplugHostDescriptor("mqtt://localhost")
' Instantiate the edge node object and hook events.
Dim edgeNode = New EasySparkplugEdgeNode(hostDescriptor, "easyGroup", "easySparkplugDemo")
AddHandler edgeNode.SystemConnectionStateChanged,
Sub(sender, eventArgs)
' Display the new connection state (such as when the connection to the broker succeeds or fails).
Console.WriteLine($"{NameOf(EasySparkplugEdgeNode.SystemConnectionStateChanged)}: {eventArgs}")
End Sub
' Create a read-only data metric.
Dim metric = SparkplugMetric.CreateIn(edgeNode, "ReadThisMetric") _
.ValueType(Of Integer)() _
.Writable(False)
' Create a timer for pushing the data to the metric. In a real edge node or device, the activity may also come
' from other sources.
Dim timer = New Timer With
{
.Interval = 1000, ' 1 second
.AutoReset = True
}
' Set the read data of the metric to a random value whenever the timer interval elapses.
Dim random = New Random()
AddHandler timer.Elapsed, Sub(s, a) metric.UpdateReadData(random.Next())
timer.Start()
' Start the edge node.
Console.WriteLine("The edge node is starting...")
edgeNode.Start()
Console.WriteLine("The edge node is started.")
Console.WriteLine()
' Let the user decide when to stop.
Console.WriteLine("Press Enter to stop the edge node...")
Console.ReadLine()
' Stop the edge node.
Console.WriteLine("The edge node is stopping...")
edgeNode.Stop()
Console.WriteLine("The edge node is stopped.")
' Stop the timer.
timer.Stop()
End Sub
End Class
End Namespace
