/// <inheritdoc/>
protected override async Task OnOpeningAsync(CancellationToken token = default)
{
if (RemoteEndpoint.Server == null)
{
// If specific endpoint is not provided, use discovery to select endpoint with highest
// security level.
var endpointUrl = RemoteEndpoint.EndpointUrl;
var securityPolicyUri = RemoteEndpoint.SecurityPolicyUri;
try
{
_logger?.LogInformation($"Discovering endpoints of '{endpointUrl}'.");
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
var getEndpointsResponse = await UaTcpDiscoveryService.GetEndpointsAsync(getEndpointsRequest, _loggerFactory).ConfigureAwait(false);
if (getEndpointsResponse.Endpoints == null || getEndpointsResponse.Endpoints.Length == 0)
{
throw new InvalidOperationException($"'{endpointUrl}' returned no endpoints.");
}
var selectedEndpoint = getEndpointsResponse.Endpoints
.OfType <EndpointDescription>()
.Where(e => string.IsNullOrEmpty(securityPolicyUri) || e.SecurityPolicyUri == securityPolicyUri)
.OrderBy(e => e.SecurityLevel)
.LastOrDefault();
if (selectedEndpoint is null)
{
throw new InvalidOperationException($"'{endpointUrl}' returned no endpoint for the requested security policy '{securityPolicyUri}'.");
}
RemoteEndpoint.Server = selectedEndpoint.Server;
RemoteEndpoint.ServerCertificate = selectedEndpoint.ServerCertificate;
RemoteEndpoint.SecurityMode = selectedEndpoint.SecurityMode;
RemoteEndpoint.SecurityPolicyUri = selectedEndpoint.SecurityPolicyUri;
RemoteEndpoint.UserIdentityTokens = selectedEndpoint.UserIdentityTokens;
RemoteEndpoint.TransportProfileUri = selectedEndpoint.TransportProfileUri;
RemoteEndpoint.SecurityLevel = selectedEndpoint.SecurityLevel;
_logger?.LogTrace($"Success discovering endpoints of '{endpointUrl}'.");
}
catch (Exception ex)
{
_logger?.LogError($"Error discovering endpoints of '{endpointUrl}'. {ex.Message}");
throw;
}
}
// Ask for user identity. May show dialog.
if (UserIdentityProvider != null)
{
UserIdentity = await UserIdentityProvider(RemoteEndpoint);
}
await base.OnOpeningAsync(token);
}
public async Task SessionTimeoutCausesFault()
{
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = EndpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryService.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;
default:
selectedUserIdentity = new AnonymousIdentity();
break;
}
var channel = new UaTcpSessionChannel(
this.localDescription,
this.certificateStore,
selectedUserIdentity,
selectedEndpoint,
loggerFactory: this.loggerFactory,
options: new UaTcpSessionChannelOptions {
SessionTimeout = 10000
});
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}'.");
// 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($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
public async Task ConnnectToAllEndpoints()
{
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = EndpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryService.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;
case UserTokenType.Anonymous:
selectedUserIdentity = new AnonymousIdentity();
break;
default:
continue;
}
var channel = new UaTcpSessionChannel(
this.localDescription,
this.certificateStore,
async e => selectedUserIdentity,
selectedEndpoint,
loggerFactory: this.loggerFactory,
options: new UaTcpSessionChannelOptions {
TimeoutHint = 60000
});
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}'.");
Console.WriteLine($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
}
}
public static GetEndpointsResponse GetEndpoints(string endpoint, string port)
{
var temp = UaTcpDiscoveryService.GetEndpointsAsync(new GetEndpointsRequest()
{
EndpointUrl = "opc.tcp://" + endpoint + ":" + port
}, loggerFactory);
return(temp.Result);
}
public static async Task <GetEndpointsResponse> GetEndpointsAsync(string endpoint, string port)
{
var temp = await UaTcpDiscoveryService.GetEndpointsAsync(new GetEndpointsRequest()
{
EndpointUrl = "opc.tcp://" + endpoint + ":" + port
}, loggerFactory);
return(temp);
}
public async Task ConnnectToEndpointsWithNoSecurityAndWithNoCertificate()
{
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = EndpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
logger.LogInformation($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryService.GetEndpointsAsync(getEndpointsRequest, loggerFactory);
// 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.SecurityPolicyUri == SecurityPolicyUris.None))
{
foreach (var selectedTokenPolicy in selectedEndpoint.UserIdentityTokens)
{
IUserIdentity selectedUserIdentity;
switch (selectedTokenPolicy.TokenType)
{
case UserTokenType.UserName:
selectedUserIdentity = new UserNameIdentity("root", "secret");
break;
case UserTokenType.Anonymous:
selectedUserIdentity = new AnonymousIdentity();
break;
default:
continue;
}
var channel = new UaTcpSessionChannel(
localDescription,
null,
selectedUserIdentity,
selectedEndpoint,
loggerFactory: loggerFactory);
await channel.OpenAsync();
logger.LogInformation($"Opened session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
logger.LogInformation($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
logger.LogInformation($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
logger.LogInformation($"UserIdentityToken: '{channel.UserIdentity}'.");
logger.LogInformation($"Closing session '{channel.SessionId}'.");
await channel.CloseAsync();
}
}
}
public IObservable <EndpointDescription[]> GetEndpoints(string url)
{
var request = new GetEndpointsRequest
{
EndpointUrl = url,
};
return(Observable.FromAsync(async() =>
{
var respones = await UaTcpDiscoveryService.GetEndpointsAsync(request);
return respones
.Endpoints;
}));
}
public static async Task ReadSubscribed(CancellationToken token = default(CancellationToken))
{
{
// setup logger
var loggerFactory = new LoggerFactory();
loggerFactory.AddConsole(LogLevel.Information);
//var logger = loggerFactory?.CreateLogger<Program>();
// Describe this app.
var appDescription = new ApplicationDescription()
{
ApplicationName = "DataLoggingConsole",
ApplicationUri = $"urn:{System.Net.Dns.GetHostName()}:DataLoggingConsole",
ApplicationType = ApplicationType.Client,
};
// Create a certificate store on disk.
// Create array of NodeIds to log.
while (!token.IsCancellationRequested)
{
try
{
// Discover endpoints.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = discoveryUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
var getEndpointsResponse = await UaTcpDiscoveryService.GetEndpointsAsync(getEndpointsRequest)
.ConfigureAwait(false);
if (getEndpointsResponse.Endpoints == null || getEndpointsResponse.Endpoints.Length == 0)
{
throw new InvalidOperationException($"'{discoveryUrl}' returned no endpoints.");
}
// Choose the endpoint with highest security level.
var remoteEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
// Create a session with the server.
var channel = new UaTcpSessionChannel(appDescription, certificateStore,
async e => GetIUserIdentity(remoteEndpoint).GetAwaiter().GetResult(),
remoteEndpoint, loggerFactory);
try
{
await channel.OpenAsync();
var subscriptionRequest = new CreateSubscriptionRequest
{
RequestedPublishingInterval = 1000,
RequestedMaxKeepAliveCount = 10,
RequestedLifetimeCount = 30,
PublishingEnabled = true
};
var subscriptionResponse = await channel.CreateSubscriptionAsync(subscriptionRequest);
var id = subscriptionResponse.SubscriptionId;
var itemsToCreate = new MonitoredItemCreateRequest[]
{
#region MonitoredItems
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Admin.ProdProcessedCount"), AttributeId = AttributeIds.Value
}, //ProdProcessedCount
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 1, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Command.Parameter[0].Value"), AttributeId = AttributeIds.Value
}, //Next batch ID
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 2, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Command.Parameter[1].Value"), AttributeId = AttributeIds.Value
}, //Next product ID
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 3, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Command.Parameter[2].Value"), AttributeId = AttributeIds.Value
}, //Amount of product in next batch
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 4, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Status.Parameter[2].Value"), AttributeId = AttributeIds.Value
}, //Humidity
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 5, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Status.Parameter[3].Value"), AttributeId = AttributeIds.Value
}, //Temperature
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 6, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Status.Parameter[4].Value"), AttributeId = AttributeIds.Value
}, //Vibration
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 7, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Status.MachSpeed"), AttributeId = AttributeIds.Value
}, //MachineSpeed
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 8, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Status.StateCurrent"), AttributeId = AttributeIds.Value
}, //state
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 9, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
},
new MonitoredItemCreateRequest
{
ItemToMonitor = new ReadValueId
{
NodeId = NodeId.Parse("ns=6;s=::Program:Cube.Status.StateCurrent"), AttributeId = AttributeIds.Value
}, //cmdCtrln
MonitoringMode = MonitoringMode.Reporting,
RequestedParameters = new MonitoringParameters
{
ClientHandle = 10, SamplingInterval = -1, QueueSize = 0, DiscardOldest = true
}
}
#endregion
};
var itemsRequest = new CreateMonitoredItemsRequest
{
SubscriptionId = id,
ItemsToCreate = itemsToCreate,
};
var itemsResponse = await channel.CreateMonitoredItemsAsync(itemsRequest);
var subToken = channel.Where(pr => pr.SubscriptionId == id).Subscribe(pr =>
{
// loop through all the data change notifications
var dcns = pr.NotificationMessage.NotificationData.OfType <DataChangeNotification>();
foreach (var dcn in dcns)
{
foreach (var min in dcn.MonitoredItems)
{
switch (min.ClientHandle)
{
case 1:
prodProc = (int)min.Value.Value;
time = (DateTime)min.Value.ServerTimestamp;
break;
case 2:
time = (DateTime)min.Value.ServerTimestamp;
nextBatchID = (float)min.Value.Value;
break;
case 3:
time = (DateTime)min.Value.ServerTimestamp;
nextProductID = (float)min.Value.Value;
break;
case 4:
time = (DateTime)min.Value.ServerTimestamp;
nextProductAmount = (float)min.Value.Value;
break;
case 5:
time = (DateTime)min.Value.ServerTimestamp;
humidity = (float)min.Value.Value;
break;
case 6:
time = (DateTime)min.Value.ServerTimestamp;
temperature = (float)min.Value.Value;
break;
case 7:
time = (DateTime)min.Value.ServerTimestamp;
vibration = (float)min.Value.Value;
break;
case 8:
time = (DateTime)min.Value.ServerTimestamp;
machinespeed = (float)min.Value.Value;
break;
case 9:
time = (DateTime)min.Value.ServerTimestamp;
State = (int)min.Value.Value;
break;
case 10:
cmdctrl = (int)min.Value.Value;
time = (DateTime)min.Value.ServerTimestamp;
break;
}
}
}
});
while (!token.IsCancellationRequested)
{
await Task.Delay(500);
}
}
catch
{
}
}
catch (Exception ex)
{
}
//try
//{
// await Task.Delay(cycleTime, token);
//}
//catch
//{
//}
}
}
}
private static async Task Write(List <NodeId> nodesIds, DataValue dataval)
{
// setup logger
var loggerFactory = new LoggerFactory();
loggerFactory.AddDebug(LogLevel.Debug);
// Describe this app.
var appDescription = new ApplicationDescription()
{
ApplicationName = "DataLoggingConsole",
ApplicationUri = $"urn:{System.Net.Dns.GetHostName()}:DataLoggingConsole",
ApplicationType = ApplicationType.Client,
};
// Create a certificate store on disk.
// Create array of NodeIds to log.
var nodeIds = nodesIds.ToArray();
try
{
// Discover endpoints.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = discoveryUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
var getEndpointsResponse = await UaTcpDiscoveryService.GetEndpointsAsync(getEndpointsRequest).ConfigureAwait(false);
if (getEndpointsResponse.Endpoints == null || getEndpointsResponse.Endpoints.Length == 0)
{
throw new InvalidOperationException($"'{discoveryUrl}' returned no endpoints.");
}
// Choose the endpoint with highest security level.
var remoteEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
// Create a session with the server.
var session = new UaTcpSessionChannel(appDescription, certificateStore, async e => GetIUserIdentity(remoteEndpoint).GetAwaiter().GetResult(), remoteEndpoint, loggerFactory);
try
{
await session.OpenAsync();
RegisterNodesResponse registerNodesResponse = null;
if (true) // True registers the nodeIds to improve performance of the server.
{
// Register array of nodes to read.
var registerNodesRequest = new RegisterNodesRequest
{
NodesToRegister = nodeIds
};
registerNodesResponse = await session.RegisterNodesAsync(registerNodesRequest);
}
WriteRequest writeRequest = new WriteRequest();
writeRequest.NodesToWrite = new WriteValue[1]
{
new WriteValue()
{
NodeId = nodeIds[0],
AttributeId = AttributeIds.Value,
Value = dataval
}
};
WriteRequest request = writeRequest;
StatusCode statusCode;
// write the nodes.
statusCode = (await session.WriteAsync(request).ConfigureAwait(false)).Results[0];;
}
catch
{
await session.AbortAsync();
throw;
}
await session.AbortAsync();
}
catch (Exception e)
{
// ignored
}
}
private async Task <bool> TryConnect()
{
if (connection != null)
{
return(true);
}
if (string.IsNullOrEmpty(config.Address))
{
return(false);
}
try {
var getEndpointsRequest = new GetEndpointsRequest {
EndpointUrl = config.Address,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
GetEndpointsResponse endpoints = await UaTcpDiscoveryService.GetEndpointsAsync(getEndpointsRequest);
EndpointDescription[] noSecurityEndpoints = endpoints.Endpoints.Where(e => e.SecurityPolicyUri == SecurityPolicyUris.None).ToArray();
var(endpoint, userIdentity) = FirstEndpointWithLogin(noSecurityEndpoints);
if (endpoint == null || userIdentity == null)
{
throw new Exception("No matching endpoint");
}
var channel = new UaTcpSessionChannel(
this.appDescription,
null,
userIdentity,
endpoint,
loggerFactory);
await channel.OpenAsync();
this.connection = channel;
PrintLine($"Opened session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.");
PrintLine($"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.");
PrintLine($"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.");
PrintLine($"UserIdentityToken: '{channel.UserIdentity}'.");
ItemInfo[] nodesNeedingResolve = mapId2Info.Values.Where(n => n.Node == null).ToArray();
if (nodesNeedingResolve.Length > 0)
{
PrintLine($"Resolving node ids for {nodesNeedingResolve.Length} items...");
TranslateBrowsePathsToNodeIdsRequest req = new TranslateBrowsePathsToNodeIdsRequest()
{
BrowsePaths = nodesNeedingResolve.Select(n => new BrowsePath()
{
StartingNode = n.StartingNode,
RelativePath = n.RelativePath
}).ToArray()
};
TranslateBrowsePathsToNodeIdsResponse resp = await connection.TranslateBrowsePathsToNodeIdsAsync(req);
if (resp.Results.Length != nodesNeedingResolve.Length)
{
LogWarn("Mismatch", "TranslateBrowsePathsToNodeIds failed");
}
else
{
for (int i = 0; i < resp.Results.Length; ++i)
{
BrowsePathResult x = resp.Results[i];
if (StatusCode.IsGood(x.StatusCode) && x.Targets.Length > 0)
{
NodeId id = x.Targets[0].TargetId.NodeId;
nodesNeedingResolve[i].Node = id;
PrintLine($"Resolved item '{nodesNeedingResolve[i].Name}' => {id}");
}
else
{
PrintLine($"Could not resolve item '{nodesNeedingResolve[i].Name}'!");
}
}
}
}
return(true);
}
catch (Exception exp) {
Exception baseExp = exp.GetBaseException() ?? exp;
LogWarn("OpenChannel", "Open channel error: " + baseExp.Message, dataItem: null, details: baseExp.StackTrace);
await CloseChannel();
return(false);
}
}
private static async Task TestAsync(CancellationToken token = default(CancellationToken))
{
var discoveryUrl = $"opc.tcp://localhost:26543";
var cycleTime = 5000;
// setup logger
var loggerFactory = new LoggerFactory();
loggerFactory.AddConsole(LogLevel.Information);
var logger = loggerFactory?.CreateLogger <Program>();
// Describe this app.
var appDescription = new ApplicationDescription()
{
ApplicationName = "DataLoggingConsole",
ApplicationUri = $"urn:{System.Net.Dns.GetHostName()}:DataLoggingConsole",
ApplicationType = ApplicationType.Client,
};
// Create a certificate store on disk.
var certificateStore = new DirectoryStore(
Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "DataLoggingConsole", "pki"));
// Create array of NodeIds to log.
var nodeIds = new[]
{
NodeId.Parse("i=2258")
};
while (!token.IsCancellationRequested)
{
try
{
// Discover endpoints.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = discoveryUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
var getEndpointsResponse = await UaTcpDiscoveryService.GetEndpointsAsync(getEndpointsRequest).ConfigureAwait(false);
if (getEndpointsResponse.Endpoints == null || getEndpointsResponse.Endpoints.Length == 0)
{
throw new InvalidOperationException($"'{discoveryUrl}' returned no endpoints.");
}
// Choose the endpoint with highest security level.
var remoteEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
// Choose a User Identity.
IUserIdentity userIdentity = null;
if (remoteEndpoint.UserIdentityTokens.Any(p => p.TokenType == UserTokenType.Anonymous))
{
userIdentity = new AnonymousIdentity();
}
else if (remoteEndpoint.UserIdentityTokens.Any(p => p.TokenType == UserTokenType.UserName))
{
// If a username / password is requested, provide from .config file.
userIdentity = new UserNameIdentity("root", "secret");
}
else
{
throw new InvalidOperationException("Server must accept Anonymous or UserName identity.");
}
// Create a session with the server.
var session = new UaTcpSessionChannel(appDescription, certificateStore, async e => userIdentity, remoteEndpoint, loggerFactory);
try
{
await session.OpenAsync();
RegisterNodesResponse registerNodesResponse = null;
if (true) // True registers the nodeIds to improve performance of the server.
{
// Register array of nodes to read.
var registerNodesRequest = new RegisterNodesRequest
{
NodesToRegister = nodeIds
};
registerNodesResponse = await session.RegisterNodesAsync(registerNodesRequest);
}
// Prepare read request.
var readRequest = new ReadRequest
{
NodesToRead = (registerNodesResponse?.RegisteredNodeIds ?? nodeIds)
.Select(n => new ReadValueId {
NodeId = n, AttributeId = AttributeIds.Value
})
.ToArray()
};
while (!token.IsCancellationRequested)
{
// Read the nodes.
var readResponse = await session.ReadAsync(readRequest).ConfigureAwait(false);
// Write the results.
for (int i = 0; i < readRequest.NodesToRead.Length; i++)
{
logger?.LogInformation($"{nodeIds[i]}; value: {readResponse.Results[i]}");
}
try
{
await Task.Delay(cycleTime, token);
}
catch { }
}
await session.CloseAsync();
}
catch
{
await session.AbortAsync();
throw;
}
}
catch (Exception ex)
{
logger?.LogError(ex.Message);
}
try
{
await Task.Delay(cycleTime, token);
}
catch { }
}
}
