Gurux.DLMS.GXDLMSServer.HandleAarqRequest C# (CSharp) Method

        private void HandleAarqRequest(GXByteBuffer data, GXDLMSConnectionEventArgs connectionInfo)
        {
            AssociationResult result = AssociationResult.Accepted;
            Settings.CtoSChallenge = null;
            if (!Settings.UseCustomChallenge)
            {
                Settings.StoCChallenge = null;
            }
            // Reset settings for wrapper.
            if (Settings.InterfaceType == InterfaceType.WRAPPER)
            {
                Reset(true);
            }
            SourceDiagnostic diagnostic = GXAPDU.ParsePDU(Settings, Settings.Cipher, data, null);
            if (diagnostic != SourceDiagnostic.None)
            {
                result = AssociationResult.PermanentRejected;
                diagnostic = SourceDiagnostic.ApplicationContextNameNotSupported;
                InvalidConnection(connectionInfo);
            }
            else
            {
                diagnostic = ValidateAuthentication(Settings.Authentication, Settings.Password);
                if (diagnostic != SourceDiagnostic.None)
                {
                    result = AssociationResult.PermanentRejected;
                    InvalidConnection(connectionInfo);
                }
                else if (Settings.Authentication > Authentication.Low)
                {
                    // If High authentication is used.
                    Settings.StoCChallenge = GXSecure.GenerateChallenge(Settings.Authentication);
                    result = AssociationResult.Accepted;
                    diagnostic = SourceDiagnostic.AuthenticationRequired;
                }
                else
                {
                    Connected(connectionInfo);
                    Settings.Connected = true;
                }
            }
            Settings.IsAuthenticationRequired = diagnostic == SourceDiagnostic.AuthenticationRequired;
            if (Settings.InterfaceType == Enums.InterfaceType.HDLC)
            {
                replyData.Set(GXCommon.LLCReplyBytes);
            }
            // Generate AARE packet.
            GXAPDU.GenerateAARE(Settings, replyData, result, diagnostic, Settings.Cipher, null);
        }