public MqttTcpServerListener( AddressFamily addressFamily, MqttServerTcpEndpointBaseOptions options, X509Certificate2 tlsCertificate, CancellationToken cancellationToken, IMqttNetChildLogger logger) { _cancellationToken = cancellationToken; _logger = logger; var sb = new SocketBuilder().SetSocket(Sockets.Model.SocketType.Tcp).UseStream(); if (options is MqttServerTlsTcpEndpointOptions tlsOptions) { sb = sb.WithSsl(tlsCertificate, tlsOptions.SslProtocol); } sb = sb.SetPort(options.Port); if (_addressFamily == AddressFamily.InterNetworkV6) { sb = sb.UseIPV6(); } socketOption = sb.Build(); serverSokcet = (StreamServerSocket)SocketFactory.CreateServerSocket(socketOption, cancellationToken); serverSokcet.OnAccepted += ServerSokcet_OnAccepted; }