// This example shows how to subscribe to changes of multiple monitored items
// and display each change, identifying the different subscriptions by an
// object.
using System;
using System.Threading;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;
namespace UADocExamples._EasyUAClient
{
partial class SubscribeMultipleMonitoredItems
{
class CustomObject
{
public CustomObject(string name)
{
Name = name;
}
public string Name { get; }
}
public static void StateAsObject()
{
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 and hook events
var client = new EasyUAClient();
client.DataChangeNotification += ClientOnDataChangeNotification_StateAsObject;
Console.WriteLine("Subscribing...");
int[] handleArray = client.SubscribeMultipleMonitoredItems(new[]
{
new EasyUAMonitoredItemArguments(null, endpointDescriptor,
"nsu=http://test.org/UA/Data/ ;i=10845", 1000)
{State = new CustomObject("First")}, // A custom object that corresponds to the subscription
new EasyUAMonitoredItemArguments(null, endpointDescriptor,
"nsu=http://test.org/UA/Data/ ;i=10853", 1000)
{State = new CustomObject("Second")}, // A custom object that corresponds to the subscription
new EasyUAMonitoredItemArguments(null, endpointDescriptor,
"nsu=http://test.org/UA/Data/ ;i=10855", 1000)
{State = new CustomObject("Third")}, // A custom object that corresponds to the subscription
});
for (int i = 0; i < handleArray.Length; i++)
Console.WriteLine($"handleArray[{i}]: {handleArray[i]}");
Console.WriteLine("Processing monitored item changed events for 10 seconds...");
Thread.Sleep(10 * 1000);
Console.WriteLine("Unsubscribing...");
client.UnsubscribeAllMonitoredItems();
Console.WriteLine("Waiting for 5 seconds...");
Thread.Sleep(5 * 1000);
Console.WriteLine("Finished.");
}
static void ClientOnDataChangeNotification_StateAsObject(object sender, EasyUADataChangeNotificationEventArgs eventArgs)
{
// Obtain the custom object we have passed in.
var stateAsObject = (CustomObject) eventArgs.Arguments.State;
// Display the data
if (eventArgs.Succeeded)
Console.WriteLine($"{stateAsObject.Name}: {eventArgs.AttributeData}");
else
Console.WriteLine($"{stateAsObject.Name} *** Failure: {eventArgs.ErrorMessageBrief}");
}
}
}
# This example shows how to subscribe to changes of multiple monitored items
# and display each change, identifying the different subscriptions by an
# object.
# 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 *
class CustomObject(object):
def __init__(self, name):
self.name = name
def dataChangeNotification(sender, eventArgs):
# Obtain the custom object we have passed in.
stateAsObject = eventArgs.Arguments.State
# Display value.
if eventArgs.Succeeded:
print(stateAsObject.name, ': ', eventArgs.AttributeData.Value, sep='')
else:
print(stateAsObject.name, ' *** 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 object and hook events.
client = EasyUAClient()
client.DataChangeNotification += dataChangeNotification
print('Subscribing...')
monitoredItemArguments1 = EasyUAMonitoredItemArguments(
None,
endpointDescriptor,
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10845'),
UAMonitoringParameters(1000))
monitoredItemArguments1.State = CustomObject('First') # a custom object that corresponds to the subscription
monitoredItemArguments2 = EasyUAMonitoredItemArguments(
None,
endpointDescriptor,
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'),
UAMonitoringParameters(1000))
monitoredItemArguments2.State = CustomObject('Second') # a custom object that corresponds to the subscription
monitoredItemArguments3 = EasyUAMonitoredItemArguments(
None,
endpointDescriptor,
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10855'),
UAMonitoringParameters(1000))
monitoredItemArguments3.State = CustomObject('Third') # a custom object that corresponds to the subscription
client.SubscribeMultipleMonitoredItems([
monitoredItemArguments1,
monitoredItemArguments2,
monitoredItemArguments3,
])
print('Processing data change events for 10 seconds...')
time.sleep(10)
print('Unsubscribing...')
client.UnsubscribeAllMonitoredItems()
print('Waiting for 5 seconds...')
time.sleep(5)
print('Finished.')
' This example shows how to subscribe to changes of multiple monitored items
' and display each change, identifying the different subscriptions by an
' object.
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.OperationModel
Namespace _EasyUAClient
Partial Friend Class SubscribeMultipleMonitoredItems
Class CustomObject
Public Sub New(ByVal name As String)
_Name = name
End Sub
Public ReadOnly Property Name As String
Get
Return _Name
End Get
End Property
Private ReadOnly _Name As String
End Class
Public Shared Sub StateAsObject()
' Define which server we will work with.
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 object and hook events
Dim client = New EasyUAClient()
AddHandler client.DataChangeNotification, AddressOf ClientOnDataChangeNotification_StateAsObject
Console.WriteLine("Subscribing...")
Dim handleArray() As Integer = client.SubscribeMultipleMonitoredItems(New EasyUAMonitoredItemArguments() _
{ _
New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, _
"nsu=http://test.org/UA/Data/ ;i=10845", 1000) _
With {.State = New CustomObject("First")}, _
New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, _
"nsu=http://test.org/UA/Data/ ;i=10853", 1000) _
With {.State = New CustomObject("Second")}, _
New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, _
"nsu=http://test.org/UA/Data/ ;i=10855", 1000) _
With {.State = New CustomObject("Third")} _
} _
) ' A custom object that corresponds to the subscription
For i As Integer = 0 To handleArray.Length - 1
Console.WriteLine("handleArray[{0}]: {1}", i, handleArray(i))
Next i
Console.WriteLine("Processing monitored item changed events for 10 seconds...")
Threading.Thread.Sleep(10 * 1000)
Console.WriteLine("Unsubscribing...")
client.UnsubscribeAllMonitoredItems()
Console.WriteLine("Waiting for 5 seconds...")
Threading.Thread.Sleep(5 * 1000)
Console.WriteLine("Finished.")
End Sub
Private Shared Sub ClientOnDataChangeNotification_StateAsObject(ByVal sender As Object, ByVal eventArgs As EasyUADataChangeNotificationEventArgs)
' Obtain the custom object we have passed in.
Dim stateAsObject As CustomObject = CType(eventArgs.Arguments.State, CustomObject)
' Display the data
If eventArgs.Succeeded Then
Console.WriteLine("{0}: {1}", stateAsObject.Name, eventArgs.AttributeData)
Else
Console.WriteLine("{0} *** Failure: {1}", stateAsObject.Name, eventArgs.ErrorMessageBrief)
End If
End Sub
End Class
End Namespace
