Gurux.DLMS.GXDLMSSNCommandHandler.HandleReadDataBlockAccess C# (CSharp) Method

        private static void HandleReadDataBlockAccess(
            GXDLMSSettings settings, GXDLMSServer server,
            Command command, GXByteBuffer data, int cnt, GXByteBuffer replyData, GXDLMSTranslatorStructure xml)
        {
            GXByteBuffer bb = new GXByteBuffer();
            byte lastBlock = data.GetUInt8();
            UInt16 blockNumber = data.GetUInt16();
            if (xml != null)
            {
                if (command == Command.WriteResponse)
                {
                    xml.AppendStartTag(TranslatorTags.WriteDataBlockAccess);
                }
                else
                {
                    xml.AppendStartTag(TranslatorTags.ReadDataBlockAccess);
                }
                xml.AppendLine("<LastBlock Value=\"" + xml.IntegerToHex(lastBlock, 2) + "\" />");
                xml.AppendLine("<BlockNumber Value=\"" + xml.IntegerToHex(blockNumber, 4) + "\" />");
                if (command == Command.WriteResponse)
                {
                    xml.AppendEndTag(TranslatorTags.WriteDataBlockAccess);
                }
                else
                {
                    xml.AppendEndTag(TranslatorTags.ReadDataBlockAccess);
                }
                return;
            }
            if (blockNumber != settings.BlockIndex)
            {
                Debug.WriteLine("handleReadRequest failed. Invalid block number. " + settings.BlockIndex + "/" + blockNumber);
                bb.SetUInt8(ErrorCode.DataBlockNumberInvalid);
                GXDLMS.GetSNPdu(new GXDLMSSNParameters(settings, command, 1, (byte)SingleReadResponse.DataAccessError, bb, null), replyData);
                settings.ResetBlockIndex();
                return;
            }
            int count = 1;
            byte type = (byte)DataType.OctetString;
            if (command == Command.WriteResponse)
            {
                count = GXCommon.GetObjectCount(data);
                type = data.GetUInt8();
            }
            int size = GXCommon.GetObjectCount(data);
            int realSize = data.Size - data.Position;
            if (count != 1 || type != (byte)DataType.OctetString || size != realSize)
            {
                Debug.WriteLine("handleGetRequest failed. Invalid block size.");
                bb.SetUInt8(ErrorCode.DataBlockUnavailable);
                GXDLMS.GetSNPdu(new GXDLMSSNParameters(settings, command, cnt, (byte)SingleReadResponse.DataAccessError, bb, null), replyData);
                settings.ResetBlockIndex();
                return;
            }
            if (server.transaction == null)
            {
                server.transaction = new GXDLMSLongTransaction(null, command, data);
            }
            else
            {
                server.transaction.data.Set(data);
            }
            if (lastBlock == 0)
            {
                bb.SetUInt16(blockNumber);
                settings.IncreaseBlockIndex();
                if (command == Command.ReadResponse)
                {
                    type = (byte)SingleReadResponse.BlockNumber;
                }
                else
                {
                    type = (byte)SingleWriteResponse.BlockNumber;
                }
                GXDLMS.GetSNPdu(new GXDLMSSNParameters(settings, command, cnt, type, null, bb), replyData);
                return;
            }
            else
            {
                if (server.transaction != null)
                {
                    data.Size = 0;
                    data.Set(server.transaction.data);
                    server.transaction = null;
                }
                if (command == Command.ReadResponse)
                {
                    HandleReadRequest(settings, server, data, replyData, xml);
                }
                else
                {
                    HandleWriteRequest(settings, server, data, replyData, xml);
                }
                settings.ResetBlockIndex();
            }
        }