public static void Main1()
{
// Instantiate the client object and hook events
var easyUAClient = new EasyUAClient();
easyUAClient.EventNotification += easyUAClient_EventNotification;
Console.WriteLine("Subscribing...");
easyUAClient.SubscribeEvent(
"opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer",
UAObjectIds.Server,
1000,
new UAEventFilterBuilder(
// Either the severity is >= 500, or the event comes from a specified source node
UAFilterElements.Or(
UAFilterElements.GreaterThanOrEqual(UABaseEventObject.Operands.Severity, 500),
UAFilterElements.Equals(
UABaseEventObject.Operands.SourceNode,
new UANodeId("nsu=http://opcfoundation.org/Quickstarts/AlarmCondition;ns=2;s=1:Metals/SouthMotor"))),
UABaseEventObject.AllFields));
Console.WriteLine("Processing event notifications for 30 seconds...");
System.Threading.Thread.Sleep(30 * 1000);
Console.WriteLine("Unsubscribing...");
easyUAClient.UnsubscribeAllMonitoredItems();
Console.WriteLine("Waiting for 5 seconds...");
System.Threading.Thread.Sleep(5 * 1000);
}
public static void Main1()
{
// Instantiate the client object and hook events
var easyUAClient = new EasyUAClient();
easyUAClient.EventNotification += easyUAClient_EventNotification;
Console.WriteLine("Subscribing...");
easyUAClient.SubscribeEvent(
"opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer",
UAObjectIds.Server,
1000,
new UAAttributeFieldCollection
{
// Select specific fields using standard operand symbols
UABaseEventObject.Operands.NodeId,
UABaseEventObject.Operands.SourceNode,
UABaseEventObject.Operands.SourceName,
UABaseEventObject.Operands.Time,
// Select specific fields using an event type ID and a simple relative path
UAFilterElements.SimpleAttribute(UAObjectTypeIds.BaseEventType, "/Message"),
UAFilterElements.SimpleAttribute(UAObjectTypeIds.BaseEventType, "/Severity"),
});
Console.WriteLine("Processing event notifications for 30 seconds...");
System.Threading.Thread.Sleep(30 * 1000);
Console.WriteLine("Unsubscribing...");
easyUAClient.UnsubscribeAllMonitoredItems();
Console.WriteLine("Waiting for 5 seconds...");
System.Threading.Thread.Sleep(5 * 1000);
}
public static void Events()
{
// Instantiate the client object and hook events
var easyUAClient = new EasyUAClient();
easyUAClient.EventNotification += easyUAClient_EventNotification;
Console.WriteLine("Subscribing...");
easyUAClient.SubscribeMultipleMonitoredItems(new[]
{
new EasyUAMonitoredItemArguments("firstState",
"opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer",
UAObjectIds.Server,
new UAMonitoringParameters(1000, new UAEventFilterBuilder(
UAFilterElements.GreaterThanOrEqual(UABaseEventObject.Operands.Severity, 500),
UABaseEventObject.AllFields)))
{
AttributeId = UAAttributeId.EventNotifier
},
new EasyUAMonitoredItemArguments("secondState",
"opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer",
UAObjectIds.Server,
new UAMonitoringParameters(2000, new UAEventFilterBuilder(
UAFilterElements.Equals(
UABaseEventObject.Operands.SourceNode,
new UANodeId("nsu=http://opcfoundation.org/Quickstarts/AlarmCondition;ns=2;s=1:Metals/SouthMotor")),
UABaseEventObject.AllFields)))
{
AttributeId = UAAttributeId.EventNotifier
},
});
Console.WriteLine("Processing event notifications for 30 seconds...");
System.Threading.Thread.Sleep(30 * 1000);
Console.WriteLine("Unsubscribing...");
easyUAClient.UnsubscribeAllMonitoredItems();
Console.WriteLine("Waiting for 5 seconds...");
System.Threading.Thread.Sleep(5 * 1000);
}
static void easyUAClient_EventNotification(object sender, EasyUAEventNotificationEventArgs e)
{
Console.WriteLine();
// Display the event
if (e.EventData == null)
{
Console.WriteLine(e);
return;
}
Console.WriteLine("All fields:");
foreach (KeyValuePair <UAAttributeField, ValueResult> pair in e.EventData.FieldResults)
{
UAAttributeField attributeField = pair.Key;
ValueResult valueResult = pair.Value;
Console.WriteLine(" {0} -> {1}", attributeField, valueResult);
}
// Extracting a specific field using a standard operand symbol
Console.WriteLine("Source name: {0}",
e.EventData.FieldResults[UABaseEventObject.Operands.SourceName]);
// Extracting a specific field using an event type ID and a simple relative path
Console.WriteLine("Message: {0}",
e.EventData.FieldResults[UAFilterElements.SimpleAttribute(UAObjectTypeIds.BaseEventType, "/Message")]);
}
public static void Main1()
{
// Instantiate the client object
var easyUAClient = new EasyUAClient();
UANodeId nodeId = null;
byte[] eventId = null;
var anEvent = new ManualResetEvent(initialState: false);
Console.WriteLine("Subscribing...");
easyUAClient.SubscribeEvent(
"opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer",
UAObjectIds.Server,
1000,
new UAEventFilterBuilder(
UAFilterElements.Equals(
UABaseEventObject.Operands.NodeId,
new UANodeId(expandedText: "nsu=http://opcfoundation.org/Quickstarts/AlarmCondition;ns=2;s=1:Colours/EastTank?Yellow")),
UABaseEventObject.AllFields),
(sender, eventArgs) =>
{
if (!eventArgs.Succeeded)
{
Console.WriteLine(eventArgs.ErrorMessageBrief);
return;
}
if (eventArgs.EventData != null)
{
UABaseEventObject baseEventObject = eventArgs.EventData.BaseEvent;
Console.WriteLine(baseEventObject);
// Make sure we do not catch the event more than once
if (anEvent.WaitOne(0))
{
return;
}
nodeId = baseEventObject.NodeId;
eventId = baseEventObject.EventId;
anEvent.Set();
}
},
state: null);
Console.WriteLine("Waiting for an event for 30 seconds...");
if (!anEvent.WaitOne(30 * 1000))
{
Console.WriteLine("Event not received");
return;
}
Console.WriteLine("Acknowledging an event...");
easyUAClient.Acknowledge(
"opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer",
nodeId,
eventId,
"Acknowledged by an automated example code");
Console.WriteLine("Waiting for 5 seconds...");
Thread.Sleep(5 * 1000);
Console.WriteLine("Unsubscribing...");
easyUAClient.UnsubscribeAllMonitoredItems();
Console.WriteLine("Waiting for 5 seconds...");
Thread.Sleep(5 * 1000);
}