public async Task CreateEventSubscription()
{
// describe this client application.
var clientDescription = new ApplicationDescription
{
ApplicationName = "Workstation.UaClient.FeatureTests",
ApplicationUri = $"urn:{System.Net.Dns.GetHostName()}:Workstation.UaClient.FeatureTests",
ApplicationType = ApplicationType.Client
};
// place to store certificates
var certificateStore = new DirectoryStore("./pki");
// create a 'UaTcpSessionChannel', a client-side channel that opens a 'session' with the server.
var channel = new UaTcpSessionChannel(
clientDescription,
certificateStore,
new AnonymousIdentity(), // the anonymous identity
"opc.tcp://localhost:48010"); // the endpoint of Unified Automation's UaCPPServer.
try
{
// try opening a session and reading a few nodes.
await channel.OpenAsync();
Console.WriteLine($"Opened session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
Console.WriteLine($"UserIdentityToken: '{channel.UserIdentity}'.");
// build a CreateSubscriptionRequest. See 'OPC UA Spec Part 4' paragraph 5.13.2
var req = new CreateSubscriptionRequest
{
RequestedPublishingInterval = 500.0, // intervals are in milliseconds
RequestedMaxKeepAliveCount = 30,
RequestedLifetimeCount = 30 * 3,
PublishingEnabled = true,
};
var res = await channel.CreateSubscriptionAsync(req);
// the result will return the server's subscription id. You will needs this to
// add monitored items.
var id = res.SubscriptionId;
Console.WriteLine($"Created subscription '{id}'.");
// build a CreateMonitoredItemsRequest. See 'OPC UA Spec Part 4' paragraph 5.12.2
var req2 = new CreateMonitoredItemsRequest
{
SubscriptionId = id,
TimestampsToReturn = TimestampsToReturn.Both,
ItemsToCreate = new MonitoredItemCreateRequest[]
{
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId {
AttributeId = AttributeIds.EventNotifier, NodeId = NodeId.Parse(ObjectIds.Server)
},
MonitoringMode = MonitoringMode.Reporting,
// specify a unique ClientHandle. The ClientHandle is returned in the PublishResponse
RequestedParameters = new MonitoringParameters {
ClientHandle = 42, SamplingInterval = -1.0, QueueSize = 1000, DiscardOldest = true,
// events require an EventFilter with a SelectClause (a list of fields to receive)
Filter = new EventFilter {
SelectClauses = EventHelper.GetSelectClauses <BaseEvent>()
}
},
},
},
};
var res2 = await channel.CreateMonitoredItemsAsync(req2);
Console.WriteLine("\nSubscribe to PublishResponse stream.");
// when the session is open, the client sends a stream of PublishRequests to the server.
// You can subscribe to all the PublishResponses -or- subscribe to the responses from
// a single subscription.
var token = channel
// receive responses for the subscription we just created
.Where(pr => pr.SubscriptionId == id)
// subscribe with an 'OnNext' function, and an 'OnError' function
.Subscribe(
pr =>
{
// loop thru all the event notifications and write them out.
var enls = pr.NotificationMessage.NotificationData.OfType <EventNotificationList>();
foreach (var enl in enls)
{
foreach (var efl in enl.Events)
{
var ev = EventHelper.Deserialize <BaseEvent>(efl.EventFields);
Console.WriteLine($"time: {ev.Time}, src: {ev.SourceName}, msg: {ev.Message}, sev: {ev.Severity}");
}
}
},
ex => Console.WriteLine("Exception in publish response handler: {0}", ex.GetBaseException().Message)
);
// publish for 5 seconds and then close.
for (int i = 0; i < 10; i++)
{
// trigger an event on the Unified Automation server.
var writeResult = await channel.WriteAsync(
new WriteRequest
{
// Write true, false, true, false, ...
NodesToWrite = new[] {
new WriteValue {
NodeId = NodeId.Parse("ns=2;s=Demo.Events.Trigger_BaseEvent"),
AttributeId = AttributeIds.Value,
Value = new DataValue(i % 2 == 0)
}
}
}
);
await Task.Delay(500);
}
Console.WriteLine($"\nClosing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
catch (Exception ex)
{
await channel.AbortAsync();
Console.WriteLine(ex.Message);
}
}
public async Task ReadHistorical()
{
var channel = new UaTcpSessionChannel(
localDescription,
certificateStore,
new AnonymousIdentity(),
"opc.tcp://localhost:48010",
loggerFactory: loggerFactory);
await channel.OpenAsync();
logger.LogInformation($"Opened session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
logger.LogInformation($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
logger.LogInformation($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
logger.LogInformation($"Activated session '{channel.SessionId}'.");
var historyReadRequest = new HistoryReadRequest
{
HistoryReadDetails = new ReadRawModifiedDetails
{
StartTime = DateTime.UtcNow - TimeSpan.FromMinutes(10),
EndTime = DateTime.UtcNow,
ReturnBounds = true,
IsReadModified = false
},
NodesToRead = new[]
{
new HistoryReadValueId
{
NodeId = NodeId.Parse("ns=2;s=Demo.History.DoubleWithHistory")
}
},
};
var historyReadResponse = await channel.HistoryReadAsync(historyReadRequest);
var result = historyReadResponse.Results[0];
StatusCode.IsGood(result.StatusCode)
.Should().BeTrue();
logger.LogInformation($"HistoryRead response status code: {result.StatusCode}, HistoryData count: {((HistoryData)result.HistoryData).DataValues.Length}.");
if (false) // UaCPPserver does not appear to store event history.
{
var historyReadRequest2 = new HistoryReadRequest
{
HistoryReadDetails = new ReadEventDetails
{
StartTime = DateTime.UtcNow - TimeSpan.FromMinutes(10),
EndTime = DateTime.UtcNow,
Filter = new EventFilter // Use EventHelper to select all the fields of AlarmCondition.
{
SelectClauses = EventHelper.GetSelectClauses <AlarmCondition>()
}
},
NodesToRead = new[]
{
new HistoryReadValueId
{
NodeId = NodeId.Parse("ns=2;s=Demo.History.DoubleWithHistory")
}
},
};
var historyReadResponse2 = await channel.HistoryReadAsync(historyReadRequest2);
var result2 = historyReadResponse2.Results[0];
StatusCode.IsGood(result2.StatusCode)
.Should().BeTrue();
logger.LogInformation($"HistoryRead response status code: {result2.StatusCode}, HistoryEvent count: {((HistoryEvent)result2.HistoryData).Events.Length}.");
// Use EventHelper to create AlarmConditions from the HistoryEventFieldList
var alarms = ((HistoryEvent)result2.HistoryData).Events.Select(e => EventHelper.Deserialize <AlarmCondition>(e.EventFields));
}
logger.LogInformation($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
public async Task ReadHistorical()
{
var channel = new UaTcpSessionChannel(
this.localDescription,
this.certificateStore,
null,
EndpointUrl);
await channel.OpenAsync();
Console.WriteLine($"Opened session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
Console.WriteLine($"Activated session '{channel.SessionId}'.");
var historyReadRequest = new HistoryReadRequest
{
HistoryReadDetails = new ReadRawModifiedDetails
{
StartTime = DateTime.UtcNow - TimeSpan.FromMinutes(10),
EndTime = DateTime.UtcNow,
ReturnBounds = true,
IsReadModified = false
},
NodesToRead = new[]
{
new HistoryReadValueId
{
NodeId = NodeId.Parse("ns=2;s=MyLevel")
}
},
};
var historyReadResponse = await channel.HistoryReadAsync(historyReadRequest);
var result = historyReadResponse.Results[0];
Assert.IsTrue(StatusCode.IsGood(result.StatusCode));
Console.WriteLine($"HistoryRead response status code: {result.StatusCode}, HistoryData count: {((HistoryData)result.HistoryData.Body).DataValues.Length}.");
var historyReadRequest2 = new HistoryReadRequest
{
HistoryReadDetails = new ReadEventDetails
{
StartTime = DateTime.UtcNow - TimeSpan.FromMinutes(10),
EndTime = DateTime.UtcNow,
Filter = new EventFilter // Use EventHelper to select all the fields of AlarmCondition.
{
SelectClauses = EventHelper.GetSelectClauses <AlarmCondition>()
}
},
NodesToRead = new[]
{
new HistoryReadValueId
{
NodeId = NodeId.Parse("ns=2;s=MyDevice")
}
},
};
var historyReadResponse2 = await channel.HistoryReadAsync(historyReadRequest2);
var result2 = historyReadResponse2.Results[0];
Assert.IsTrue(StatusCode.IsGood(result2.StatusCode));
Console.WriteLine($"HistoryRead response status code: {result2.StatusCode}, HistoryEvent count: {((HistoryEvent)result2.HistoryData.Body).Events.Length}.");
// Use EventHelper to create AlarmConditions from the HistoryEventFieldList
var alarms = ((HistoryEvent)result2.HistoryData.Body).Events.Select(e => EventHelper.Deserialize <AlarmCondition>(e.EventFields));
Console.WriteLine($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
