public async Task ConnnectToEndpointsWithNoSecurityAndWithNoCertificate()
{
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
// for each endpoint and user identity type, try creating a session and reading a few nodes.
foreach (var selectedEndpoint in getEndpointsResponse.Endpoints.Where(e => e.SecurityMode == MessageSecurityMode.None))
{
foreach (var selectedTokenPolicy in selectedEndpoint.UserIdentityTokens)
{
IUserIdentity selectedUserIdentity;
switch (selectedTokenPolicy.TokenType)
{
case UserTokenType.UserName:
selectedUserIdentity = new UserNameIdentity("root", "secret");
break;
//case UserTokenType.Certificate:
// selectedUserIdentity = new X509Identity(localCertificate);
// break;
case UserTokenType.Anonymous:
selectedUserIdentity = new AnonymousIdentity();
break;
default:
continue;
}
var channel = new UaTcpSessionChannel(
this.localDescription,
null,
selectedUserIdentity,
selectedEndpoint,
loggerFactory: this.loggerFactory);
Console.WriteLine($"Creating session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
Console.WriteLine($"UserIdentityToken: '{channel.UserIdentity}'.");
await channel.OpenAsync();
Console.WriteLine($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
}
}
public async Task TestSubscription()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
IUserIdentity selectedUserIdentity = new UserNameIdentity("root", "secret");
var session = new UaTcpSessionClient(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
Console.WriteLine($"Creating session with endpoint '{session.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{session.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{session.RemoteEndpoint.SecurityMode}'.");
var sub = new MySubscription(session);
Console.WriteLine($"Created subscription.");
await Task.Delay(5000);
session.Dispose();
Assert.IsTrue(sub.CurrentTime != DateTime.MinValue);
Assert.IsTrue(sub.CurrentTimeAsDataValue != null);
Assert.IsTrue(sub.CurrentTimeQueue.Count > 0);
}
protected override void OnStartup(StartupEventArgs e)
{
// Setup a logger.
this.loggerFactory = new LoggerFactory();
this.loggerFactory.AddDebug(LogLevel.Trace);
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = StatusHmi.Properties.Settings.Default.EndpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
var getEndpointsResponse = UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest).Result;
var endpoint = getEndpointsResponse.Endpoints
.Where(d => d.SecurityPolicyUri == SecurityPolicyUris.Basic256 &&
d.SecurityMode == MessageSecurityMode.SignAndEncrypt)
.First();
// Create the session client for the app.
this.session = new UaTcpSessionClient(
new ApplicationDescription()
{
ApplicationName = "Workstation.StatusHmi",
ApplicationUri = $"urn:{System.Net.Dns.GetHostName()}:Workstation.StatusHmi",
ApplicationType = ApplicationType.Client
},
new DirectoryStore(
Environment.ExpandEnvironmentVariables(@"%LOCALAPPDATA%\Workstation.StatusHmi\pki"),
loggerFactory: this.loggerFactory),
this.ProvideUserIdentity,
endpoint,
this.loggerFactory);
// Create the main view model.
var viewModel = new MainViewModel(this.session);
// Create and show the main view.
var view = new MainView {
DataContext = viewModel
};
view.Show();
base.OnStartup(e);
}
public async Task TestSubscription()
{
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
var session = new UaTcpSessionClient(
this.localDescription,
this.certificateStore,
ed => Task.FromResult <IUserIdentity>(new UserNameIdentity("root", "secret")),
selectedEndpoint,
loggerFactory: this.loggerFactory);
Console.WriteLine($"Creating session with endpoint '{session.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{session.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{session.RemoteEndpoint.SecurityMode}'.");
var sub = new MySubscription();
session.Subscribe(sub);
Console.WriteLine($"Created subscription.");
await Task.Delay(5000);
session.Dispose();
Assert.IsTrue(sub.CurrentTime != DateTime.MinValue, "CurrentTime");
Assert.IsTrue(sub.CurrentTimeAsDataValue != null, "CurrentTimeAsDataValue");
Assert.IsTrue(sub.CurrentTimeQueue.Count > 0, "CurrentTimeQueue");
}
private async Task LoadChildrenAsync(ReferenceDescriptionViewModel parent)
{
try
{
var token = this.cts.Token;
await [email protected](token);
this.NotifyPropertyChanged("IsLoading");
try
{
parent.Children.Clear();
do
{
try
{
if (this.channel == null || this.channel.State != CommunicationState.Opened)
{
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
token.ThrowIfCancellationRequested();
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).First();
if (selectedEndpoint.UserIdentityTokens.Any(p => p.TokenType == UserTokenType.Anonymous))
{
this.HideLoginPanel();
this.userIdentity = new AnonymousIdentity();
}
else if (selectedEndpoint.UserIdentityTokens.Any(p => p.TokenType == UserTokenType.UserName))
{
if (!this.showingLoginPanel)
{
this.ShowLoginPanel();
return;
}
else if (!this.ValidateLoginCredentials())
{
return;
}
else
{
this.userIdentity = new UserNameIdentity(this.userName, this.password);
}
}
else
{
throw new NotImplementedException("Browser supports only UserName and Anonymous identity, for now.");
}
dataTypeCache = new Dictionary <ExpandedNodeId, Type>();
this.channel = new UaTcpSessionChannel(
this.localDescription,
this.CertificateStore,
this.userIdentity,
selectedEndpoint);
await this.channel.OpenAsync();
}
token.ThrowIfCancellationRequested();
var rds = new List <ReferenceDescription>();
var browseRequest = new BrowseRequest {
NodesToBrowse = new[] { new BrowseDescription {
NodeId = ExpandedNodeId.ToNodeId(parent.NodeId, this.channel.NamespaceUris), ReferenceTypeId = NodeId.Parse(ReferenceTypeIds.HierarchicalReferences), ResultMask = (uint)BrowseResultMask.TargetInfo, NodeClassMask = (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, BrowseDirection = BrowseDirection.Forward, IncludeSubtypes = true
} }
};
var browseResponse = await this.channel.BrowseAsync(browseRequest);
rds.AddRange(browseResponse.Results.Where(result => result.References != null).SelectMany(result => result.References));
var continuationPoints = browseResponse.Results.Select(br => br.ContinuationPoint).Where(cp => cp != null).ToArray();
while (continuationPoints.Length > 0)
{
token.ThrowIfCancellationRequested();
var browseNextRequest = new BrowseNextRequest {
ContinuationPoints = continuationPoints, ReleaseContinuationPoints = false
};
var browseNextResponse = await this.channel.BrowseNextAsync(browseNextRequest);
rds.AddRange(browseResponse.Results.Where(result => result.References != null).SelectMany(result => result.References));
}
if (rds.Count == 0)
{
return;
}
foreach (var rd in rds)
{
token.ThrowIfCancellationRequested();
var n = ExpandedNodeId.ToNodeId(rd.NodeId, this.channel.NamespaceUris);
Type dataType = null;
EventNotifierFlags notifier = EventNotifierFlags.None;
AccessLevelFlags accessLevel = AccessLevelFlags.None;
if (rd.NodeClass == NodeClass.Variable)
{
var readRequest = new ReadRequest
{
NodesToRead = new ReadValueId[]
{
new ReadValueId {
NodeId = n, AttributeId = AttributeIds.DataType
},
new ReadValueId {
NodeId = n, AttributeId = AttributeIds.ValueRank
},
new ReadValueId {
NodeId = n, AttributeId = AttributeIds.UserAccessLevel
}
}
};
var readResponse = await this.channel.ReadAsync(readRequest);
ExpandedNodeId dataTypeId, origDataTypeId;
ReferenceDescription dataTypeRef;
var dataTypeNode = readResponse.Results[0].GetValueOrDefault(NodeId.Null);
if (dataTypeNode != NodeId.Null)
{
dataTypeId = origDataTypeId = NodeId.ToExpandedNodeId(dataTypeNode, this.channel.NamespaceUris);
if (!this.dataTypeCache.TryGetValue(dataTypeId, out dataType))
{
if (!UaTcpSecureChannel.DataTypeIdToTypeDictionary.TryGetValue(dataTypeId, out dataType))
{
do
{
dataTypeNode = ExpandedNodeId.ToNodeId(dataTypeId, this.channel.NamespaceUris);
var browseRequest2 = new BrowseRequest {
NodesToBrowse = new[] { new BrowseDescription {
NodeId = dataTypeNode, ReferenceTypeId = NodeId.Parse(ReferenceTypeIds.HasSubtype), ResultMask = (uint)BrowseResultMask.None, NodeClassMask = (uint)NodeClass.DataType, BrowseDirection = BrowseDirection.Inverse, IncludeSubtypes = false
} }
};
var browseResponse2 = await this.channel.BrowseAsync(browseRequest2);
dataTypeRef = browseResponse2.Results[0].References?.FirstOrDefault();
dataTypeId = dataTypeRef?.NodeId;
}while (dataTypeId != null && !UaTcpSecureChannel.DataTypeIdToTypeDictionary.TryGetValue(dataTypeId, out dataType));
if (dataTypeId == null)
{
dataType = typeof(object);
}
}
this.dataTypeCache.Add(origDataTypeId, dataType);
}
var valueRank = readResponse.Results[1].GetValueOrDefault(-1);
if (valueRank == 1)
{
dataType = dataType.MakeArrayType();
}
if (valueRank > 1)
{
dataType = dataType.MakeArrayType(valueRank);
}
}
else
{
dataType = typeof(object);
}
accessLevel = (AccessLevelFlags)Enum.ToObject(typeof(AccessLevelFlags), readResponse.Results[2].GetValueOrDefault <byte>());
}
else if (rd.NodeClass == NodeClass.Object)
{
var readRequest = new ReadRequest
{
NodesToRead = new ReadValueId[]
{
new ReadValueId {
NodeId = n, AttributeId = AttributeIds.EventNotifier
},
}
};
var readResponse = await this.channel.ReadAsync(readRequest);
notifier = (EventNotifierFlags)Enum.ToObject(typeof(EventNotifierFlags), readResponse.Results[0].GetValueOrDefault <byte>());
}
parent.Children.Add(new ReferenceDescriptionViewModel(rd, dataType, accessLevel, notifier, parent, this.LoadChildrenAsync));
await Task.Yield();
}
break; // exit while;
}
catch (OperationCanceledException ex)
{
// exit while;
}
catch (ServiceResultException ex)
{
Console.WriteLine("ServiceResultException: {0}", ex);
if (this.channel != null)
{
await this.channel.AbortAsync(token);
this.channel = null;
}
if (ex.HResult == unchecked ((int)StatusCodes.BadSessionIdInvalid))
{
continue;
}
}
catch (Exception ex)
{
Console.WriteLine("Exception {0}", ex);
if (this.channel != null)
{
await this.channel.AbortAsync(token);
this.channel = null;
}
}
try
{
await Task.Delay(5000, token);
}
catch (OperationCanceledException)
{
}
}while (!token.IsCancellationRequested);
}
catch (Exception ex)
{
Console.WriteLine("Exception {0}", ex);
}
finally
{
[email protected]();
this.NotifyPropertyChanged("IsLoading");
}
}
catch (OperationCanceledException)
{
// only get here if cancelled while waiting for lock
}
}
public async Task ConnnectToAllEndpoints()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
// for each endpoint and user identity type, try creating a session and reading a few nodes.
foreach (var selectedEndpoint in getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel))
{
foreach (var selectedTokenPolicy in selectedEndpoint.UserIdentityTokens)
{
IUserIdentity selectedUserIdentity;
switch (selectedTokenPolicy.TokenType)
{
case UserTokenType.UserName:
selectedUserIdentity = new UserNameIdentity("root", "secret");
break;
case UserTokenType.Certificate:
selectedUserIdentity = new X509Identity(localCertificate);
break;
default:
selectedUserIdentity = new AnonymousIdentity();
break;
}
var channel = new UaTcpSessionChannel(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
Console.WriteLine($"Creating session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
Console.WriteLine($"UserIdentityToken: '{channel.UserIdentity}'.");
try
{
await channel.OpenAsync();
Console.WriteLine($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
catch (Exception ex)
{
Console.WriteLine($"Error opening session '{channel.SessionId}'. {ex.Message}");
}
}
}
}
public async Task TransferSubscriptions()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
IUserIdentity selectedUserIdentity = new UserNameIdentity("root", "secret");
var channel = new UaTcpSessionChannel(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
Console.WriteLine($"Creating session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
await channel.OpenAsync();
Console.WriteLine($"Activated session '{channel.SessionId}'.");
var req = new CreateSubscriptionRequest
{
RequestedPublishingInterval = 1000,
RequestedMaxKeepAliveCount = 20,
PublishingEnabled = true
};
var res = await channel.CreateSubscriptionAsync(req);
Console.WriteLine($"Created subscription '{res.SubscriptionId}'.");
Console.WriteLine($"Aborting session '{channel.SessionId}'.");
await channel.AbortAsync();
var channel2 = new UaTcpSessionChannel(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
await channel2.OpenAsync();
Console.WriteLine($"Activated session '{channel2.SessionId}'.");
var req2 = new TransferSubscriptionsRequest
{
SubscriptionIds = new[] { res.SubscriptionId }
};
var res2 = await channel2.TransferSubscriptionsAsync(req2);
Console.WriteLine($"Transferred subscription result '{res2.Results[0].StatusCode}'.");
Console.WriteLine($"Closing session '{channel2.SessionId}'.");
await channel2.CloseAsync();
Assert.IsTrue(StatusCode.IsGood(res2.Results[0].StatusCode));
}
public async Task SessionTimeoutCausesFault()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
var selectedTokenType = selectedEndpoint.UserIdentityTokens[0].TokenType;
IUserIdentity selectedUserIdentity;
switch (selectedTokenType)
{
case UserTokenType.UserName:
selectedUserIdentity = new UserNameIdentity("root", "secret");
break;
case UserTokenType.Certificate:
selectedUserIdentity = new X509Identity(localCertificate);
break;
default:
selectedUserIdentity = new AnonymousIdentity();
break;
}
var channel = new UaTcpSessionChannel(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint,
sessionTimeout: 10000);
Console.WriteLine($"Creating session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
await channel.OpenAsync();
Console.WriteLine($"Activated session '{channel.SessionId}'.");
// server should close session due to inactivity
await Task.Delay(20000);
// should throw exception
var readRequest = new ReadRequest {
NodesToRead = new[] { new ReadValueId {
NodeId = NodeId.Parse(VariableIds.Server_ServerStatus_CurrentTime), AttributeId = AttributeIds.Value
} }
};
await channel.ReadAsync(readRequest);
Console.WriteLine($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
private static async Task TestAsync()
{
var discoveryUrl = "opc.tcp://*****:*****@"%LOCALAPPDATA%\Workstation.ConsoleApp\pki")),
userIdentity,
remoteEndpoint))
{
try
{
await session.OpenAsync();
}
catch (ServiceResultException ex)
{
if ((uint)ex.HResult == StatusCodes.BadSecurityChecksFailed)
{
Console.WriteLine("Error connecting to endpoint. Did the server reject our certificate?");
}
throw ex;
}
Console.WriteLine("Step 5 - Browse the server namespace.");
Console.WriteLine("+ Root");
BrowseRequest browseRequest = new BrowseRequest
{
NodesToBrowse = new BrowseDescription[] { new BrowseDescription {
NodeId = NodeId.Parse(ObjectIds.RootFolder), BrowseDirection = BrowseDirection.Forward, ReferenceTypeId = NodeId.Parse(ReferenceTypeIds.HierarchicalReferences), NodeClassMask = (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, IncludeSubtypes = true, ResultMask = (uint)BrowseResultMask.All
} },
};
BrowseResponse browseResponse = await session.BrowseAsync(browseRequest);
foreach (var rd1 in browseResponse.Results[0].References ?? new ReferenceDescription[0])
{
Console.WriteLine(" + {0}: {1}, {2}", rd1.DisplayName, rd1.BrowseName, rd1.NodeClass);
browseRequest = new BrowseRequest
{
NodesToBrowse = new BrowseDescription[] { new BrowseDescription {
NodeId = ExpandedNodeId.ToNodeId(rd1.NodeId, session.NamespaceUris), BrowseDirection = BrowseDirection.Forward, ReferenceTypeId = NodeId.Parse(ReferenceTypeIds.HierarchicalReferences), NodeClassMask = (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, IncludeSubtypes = true, ResultMask = (uint)BrowseResultMask.All
} },
};
browseResponse = await session.BrowseAsync(browseRequest);
foreach (var rd2 in browseResponse.Results[0].References ?? new ReferenceDescription[0])
{
Console.WriteLine(" + {0}: {1}, {2}", rd2.DisplayName, rd2.BrowseName, rd2.NodeClass);
browseRequest = new BrowseRequest
{
NodesToBrowse = new BrowseDescription[] { new BrowseDescription {
NodeId = ExpandedNodeId.ToNodeId(rd2.NodeId, session.NamespaceUris), BrowseDirection = BrowseDirection.Forward, ReferenceTypeId = NodeId.Parse(ReferenceTypeIds.HierarchicalReferences), NodeClassMask = (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, IncludeSubtypes = true, ResultMask = (uint)BrowseResultMask.All
} },
};
browseResponse = await session.BrowseAsync(browseRequest);
foreach (var rd3 in browseResponse.Results[0].References ?? new ReferenceDescription[0])
{
Console.WriteLine(" + {0}: {1}, {2}", rd3.DisplayName, rd3.BrowseName, rd3.NodeClass);
}
}
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey(true);
Console.WriteLine("Step 6 - Create a subscription.");
var subscriptionRequest = new CreateSubscriptionRequest
{
RequestedPublishingInterval = 1000,
RequestedMaxKeepAliveCount = 10,
RequestedLifetimeCount = 30,
PublishingEnabled = true
};
var subscriptionResponse = await session.CreateSubscriptionAsync(subscriptionRequest).ConfigureAwait(false);
var id = subscriptionResponse.SubscriptionId;
Console.WriteLine("Step 7 - Add items to the subscription.");
var itemsToCreate = new MonitoredItemCreateRequest[]
{
new MonitoredItemCreateRequest {
ItemToMonitor = new ReadValueId {
NodeId = NodeId.Parse("i=2258"), AttributeId = AttributeIds.Value
}, MonitoringMode = MonitoringMode.Reporting, RequestedParameters = new MonitoringParameters {
ClientHandle = 12345, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
}
};
var itemsRequest = new CreateMonitoredItemsRequest
{
SubscriptionId = id,
ItemsToCreate = itemsToCreate,
};
var itemsResponse = await session.CreateMonitoredItemsAsync(itemsRequest).ConfigureAwait(false);
Console.WriteLine("Step 8 - Publish the subscription.");
var publishRequest = new PublishRequest
{
SubscriptionAcknowledgements = new SubscriptionAcknowledgement[0]
};
Console.WriteLine("Press any key to delete the subscription...");
while (!Console.KeyAvailable)
{
var publishResponse = await session.PublishAsync(publishRequest).ConfigureAwait(false);
// loop thru all the data change notifications
var dcns = publishResponse.NotificationMessage.NotificationData.OfType <DataChangeNotification>();
foreach (var dcn in dcns)
{
foreach (var min in dcn.MonitoredItems)
{
Console.WriteLine($"clientHandle: {min.ClientHandle}; value: {min.Value}");
}
}
publishRequest = new PublishRequest
{
SubscriptionAcknowledgements = new[] { new SubscriptionAcknowledgement {
SequenceNumber = publishResponse.NotificationMessage.SequenceNumber, SubscriptionId = publishResponse.SubscriptionId
} }
};
}
Console.ReadKey(true);
Console.WriteLine("Step 9 - Delete the subscription.");
var request = new DeleteSubscriptionsRequest
{
SubscriptionIds = new uint[] { id }
};
await session.DeleteSubscriptionsAsync(request).ConfigureAwait(false);
Console.WriteLine("Press any key to close the session...");
Console.ReadKey(true);
Console.WriteLine("Step 10 - Close the session.");
await session.CloseAsync();
}
}
