// This example shows how to subscribe to range of values from an array.
using System;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;
namespace UADocExamples._UAIndexRangeList
{
partial class Usage
{
public static void Subscribe()
{
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
var client = new EasyUAClient();
Console.WriteLine("Subscribing to range...");
var attributeArguments = new UAAttributeArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10933")
{
IndexRangeList = UAIndexRangeList.OneDimension(2, 4)
};
var monitoredItemArguments = new UAMonitoredItemArguments(attributeArguments, monitoringParameters:1000);
// The callback is a lambda expression the displays the value
client.SubscribeMonitoredItem(monitoredItemArguments,
(sender, eventArgs) =>
{
if (eventArgs.Succeeded)
{
var arrayValue = eventArgs.AttributeData.Value as Int32[];
if (!(arrayValue is null))
Console.WriteLine($"Value: {{{String.Join(",", arrayValue)}}}");
}
else
Console.WriteLine($"*** Failure: {eventArgs.ErrorMessageBrief}");
});
Console.WriteLine("Processing data change events for 10 seconds...");
System.Threading.Thread.Sleep(10 * 1000);
Console.WriteLine("Unsubscribing...");
client.UnsubscribeAllMonitoredItems();
Console.WriteLine("Waiting for 2 seconds...");
System.Threading.Thread.Sleep(2 * 1000);
}
}
}
# This example shows how to subscribe to range of values from an array.
# 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 *
def dataChangeNotification(sender, eventArgs):
# Display value.
if eventArgs.Succeeded:
arrayValue = eventArgs.AttributeData.Value
print('Value: {', ", ".join(["{}"]*len(arrayValue)).format(*arrayValue), '}', 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 object.
client = EasyUAClient()
print('Subscribing to range...')
attributeArguments = UAAttributeArguments(endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10933'))
attributeArguments.IndexRangeList = UAIndexRangeList.OneDimension(2, 4)
monitoredItemArguments = UAMonitoredItemArguments(attributeArguments, UAMonitoringParameters(1000))
IEasyUAClientExtension.SubscribeMonitoredItem(client,
monitoredItemArguments,
EasyUADataChangeNotificationEventHandler(dataChangeNotification))
print('Processing data change events for 10 seconds...')
time.sleep(10)
print('Unsubscribing...')
client.UnsubscribeAllMonitoredItems()
print('Waiting for 2 seconds...')
time.sleep(2)
print('Finished.')
