// This example shows how to monitor OPC UA client connections to the server. // You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-OPCStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. using System; using Microsoft.Extensions.DependencyInjection; using OpcLabs.EasyOpc.UA; using OpcLabs.EasyOpc.UA.NodeSpace; using OpcLabs.EasyOpc.UA.OperationModel; using OpcLabs.EasyOpc.UA.Services; namespace UAServerDocExamples._EasyUAServerConnectionMonitoring { class ClientSessions { public static void Main1() { // Instantiate the server object. // By default, the server will run on endpoint URL "opc.tcp://localhost:48040/". var server = new EasyUAServer(); // Define a data variable providing random integers. var random = new Random(); server.Add(new UADataVariable("MyDataVariable").ReadValueFunction(() => random.Next())); // Obtain the server connection monitoring service. IEasyUAServerConnectionMonitoring serverConnectionMonitoring = server.GetService<IEasyUAServerConnectionMonitoring>(); if (serverConnectionMonitoring is null) { Console.WriteLine("The server connection monitoring service is not available."); return; } // Hook events. serverConnectionMonitoring.ClientSessionConnected += ServerConnectionMonitoringOnClientSessionConnected; serverConnectionMonitoring.ClientSessionDisconnected += ServerConnectionMonitoringOnClientSessionDisconnected; // Start the server. Console.WriteLine("The server is starting..."); server.Start(); Console.WriteLine("The server is started."); Console.WriteLine(); // Let the user decide when to stop. Console.WriteLine("Press Enter to stop the server..."); Console.ReadLine(); // Stop the server. Console.WriteLine("The server is stopping..."); server.Stop(); Console.WriteLine("The server is stopped."); } // Event handler for the ClientSessionConnected event. static private void ServerConnectionMonitoringOnClientSessionConnected( object sender, EasyUAClientSessionConnectionEventArgs e) { var serverConnectionMonitoring = (IEasyUAServerConnectionMonitoring)sender; Console.WriteLine( $"A client session has connected to endpoint \"{e.EndpointUrlString}\". " + $"There is now {serverConnectionMonitoring.ClientSessionCount} client session(s)."); } // Event handler for the ClientSessionDisconnected event. static private void ServerConnectionMonitoringOnClientSessionDisconnected( object sender, EasyUAClientSessionConnectionEventArgs e) { var serverConnectionMonitoring = (IEasyUAServerConnectionMonitoring)sender; Console.WriteLine( $"A client session has disconnected from endpoint \"{e.EndpointUrlString}\". " + $"There is now {serverConnectionMonitoring.ClientSessionCount} client session(s)."); } } }
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