Example #1
0
        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();
            }
        }