// This example shows how to wait on an item until a value with "good" status severity becomes available.
using System;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.Extensions;
using OpcLabs.EasyOpc.UA.OperationModel;
namespace UADocExamples._EasyUAClientExtension
{
class WaitForValue
{
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 object
var client = new EasyUAClient();
Console.WriteLine("Waiting until an item value with \"good\" status severity becomes available...");
object value;
try
{
value = client.WaitForValue(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10221",
monitoringParameters: 100, // this is the sampling rate
millisecondsTimeout: 60*1000);
}
catch (UAException uaException)
{
Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
return;
}
// Display the obtained value.
Console.WriteLine("value: {0}", value);
}
}
}
# This example shows how to wait on an item until a value with "good" status severity becomes available.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc
# Import .NET namespaces.
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.Extensions import *
from OpcLabs.EasyOpc.UA.OperationModel import *
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('Waiting until an item value with "good" status severity becomes available...')
try:
value = IEasyUAClientExtension2.WaitForValue(client,
endpointDescriptor,
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10221'),
UAMonitoringParameters(100), # this is the sampling rate
60*1000) # millisecondsTimeout
except UAException as uaException:
print('*** Failure: ' + uaException.GetBaseException().Message)
exit()
# Display the obtained value.
print('value: ', value, sep='')
print()
print('Finished.')
