public void ConnectAsync(string serverURL, string userName = null, string password = null) {     if (string.IsNullOrWhiteSpace(serverURL))         throw new ArgumentNullException(nameof(serverURL));     if (_connected)         Disconnect();     if (_client == null)         _client = new EasyUAClient();     // Accept any certificate     EasyUAClientCore.SharedParameters.EngineParameters.CertificateAcceptancePolicy.AcceptAnyCertificate = true;     _serverUrl = serverURL;     Console.WriteLine("========================================");     Console.WriteLine($"[Connect] Server URL: {serverURL}");     // Simple endpoint creation - let client auto-select best available     Endpoint = new UAEndpointDescriptor(serverURL);     // Add username/password if provided     if (!string.IsNullOrWhiteSpace(userName) && !string.IsNullOrWhiteSpace(password))     {         Console.WriteLine($"[Connect] Username: {userName}");         Endpoint.UserIdentity.UserNameTokenInfo = new OpcLabs.BaseLib.IdentityModel.User.UserNameTokenInfo(userName, password);     }     else     {         Console.WriteLine("[Connect] Authentication: Anonymous");     }     // Try to connect by reading namespaces     _namespaces = new Dictionary<int, string>();     try     {         Console.WriteLine("[Connect] Connecting...");         var nsValues = _client.ReadValue(Endpoint, UAVariableIds.Server_NamespaceArray);         if (nsValues != null && nsValues is string[] namespaceValues)         {             int i = 0;             foreach (var nsValue in namespaceValues)             {                 _namespaces.Add(i++, nsValue);             }             Console.WriteLine($"[Connect] ✓ SUCCESS - {_namespaces.Count} namespaces");         }     }     catch (Exception ex)     {         Console.WriteLine("========================================");         Console.WriteLine("[Connect] ✗ FAILED");         Console.WriteLine($"[Connect] Exception: {ex.GetType().Name}");         Console.WriteLine($"[Connect] Message: {ex.Message}");         if (ex.InnerException != null)         {             Console.WriteLine($"[Connect] Inner: {ex.InnerException.GetType().Name}");             Console.WriteLine($"[Connect] Inner Message: {ex.InnerException.Message}");             if (ex.InnerException.InnerException != null)             {                 Console.WriteLine($"[Connect] Inner-Inner: {ex.InnerException.InnerException.Message}");             }         }         Console.WriteLine("========================================");         throw;     }     _connected = _namespaces.Count > 0;     if (_connected)     {         Console.WriteLine("========================================");     }     // SET UP CONNECTION MONITORING     _connectionMonitoring = _client.GetService<IEasyUAClientConnectionMonitoring>();     if (_connectionMonitoring != null)     {         _connectionMonitoring.ServerConditionChanged += onServerConditionChanged;         Console.WriteLine("Connection monitoring enabled");     }     else     {         Console.WriteLine("Warning: Connection monitoring service not available");     }     _connectionControl = _client.GetService<IEasyUAClientConnectionControl>();     if (_connectionControl == null)     {         Console.WriteLine("Warning: Connection control service not available");     } }