// ISO COTP
export const COTP_CR = 0xE0;
export const COTP_CC = 0xD0;
export const COTP_DR = 0x80;
export const COTP_DC = 0xC0;
export const COTP_DT = 0xF0;
export const COTP_DT_EOT = 0x08;

// COTP Parameter Codes
export const COTP_SRC_TSAP = 0xC1;
export const COTP_DST_TSAP = 0xC2;
export const COTP_TPDU_SIZE = 0xC0;

// TPKT
export const TPKT_VERSION = 0x03;
export const TPKT_HEADER_LEN = 4;

// S7 Protocol
export const S7_PROTOCOL_ID = 0x32;

// S7 Message Types
export const S7_MSG_TYPE_REQUEST = 0x01;
export const S7_MSG_TYPE_RESPONSE = 0x02;
export const S7_MSG_TYPE_RESPONSE_DATA = 0x03;
export const S7_MSG_TYPE_USERDATA = 0x07;

// S7 Function Codes
export const S7_FN_SETUP_COMM = 0xF0;
export const S7_FN_READ_AREA = 0x04;
export const S7_FN_WRITE_AREA = 0x05;
export const S7_FN_READ_VAR = 0x04;
export const S7_FN_WRITE_VAR = 0x05;
export const S7_FN_REQUEST_DOWNLOAD = 0x1A;
export const S7_FN_DOWNLOAD_BLOCK = 0x1B;
export const S7_FN_DOWNLOAD_ENDED = 0x1C;
export const S7_FN_START_UPLOAD = 0x1D;
export const S7_FN_UPLOAD = 0x1E;
export const S7_FN_END_UPLOAD = 0x1F;
export const S7_FN_DELETE_BLOCK = 0x28;
export const S7_FN_PLC_CONTROL = 0x28;
export const S7_FN_PLC_SECURITY = 0x2C;

// S7 Item Specification
export const S7_ITEM_SPEC = 0x12;
export const S7_ITEM_LEN = 0x0A;
export const S7_SYNTAX_ID_ANY = 0x10;

// Area IDs
export const S7AreaPE = 0x81;
export const S7AreaPA = 0x82;
export const S7AreaMK = 0x83;
export const S7AreaDB = 0x84;
export const S7AreaCT = 0x1C;
export const S7AreaTM = 0x1D;

// Word Length
export const S7WLBit = 0x01;
export const S7WLByte = 0x02;
export const S7WLWord = 0x04;
export const S7WLDWord = 0x06;
export const S7WLReal = 0x08;
export const S7WLCounter = 0x1C;
export const S7WLTimer = 0x1D;

// Transport Size (for item encoding)
export const TS_BIT = 0x01;
export const TS_BYTE = 0x02;
export const TS_WORD = 0x04;
export const TS_DWORD = 0x06;
export const TS_REAL = 0x08;
export const TS_COUNTER = 0x1C;
export const TS_TIMER = 0x1D;

// Connection Type
export const CONNTYPE_PG = 0x01;
export const CONNTYPE_OP = 0x02;
export const CONNTYPE_BASIC = 0x03;

// Block Type
export const Block_OB = 0x38;
export const Block_DB = 0x41;
export const Block_SDB = 0x42;
export const Block_FC = 0x43;
export const Block_SFC = 0x44;
export const Block_FB = 0x45;
export const Block_SFB = 0x46;

// Sub Block Type
export const SubBlk_OB = 0x08;
export const SubBlk_DB = 0x0A;
export const SubBlk_SDB = 0x0B;
export const SubBlk_FC = 0x0C;
export const SubBlk_SFC = 0x0D;
export const SubBlk_FB = 0x0E;
export const SubBlk_SFB = 0x0F;

// Block Languages
export const BlockLangAWL = 0x01;
export const BlockLangKOP = 0x02;
export const BlockLangFUP = 0x03;
export const BlockLangSCL = 0x04;
export const BlockLangDB = 0x05;
export const BlockLangGRAPH = 0x06;

// CPU Status
export const S7CpuStatusUnknown = 0x00;
export const S7CpuStatusRun = 0x08;
export const S7CpuStatusStop = 0x04;

// Max vars for MultiRead/MultiWrite
export const MAX_VARS = 20;

// Default PDU
export const DEFAULT_PDU_REQUESTED = 960;
export const DEFAULT_PDU_MIN = 240;

// Param Numbers (Client)
export const p_u16_LocalPort = 1;
export const p_u16_RemotePort = 2;
export const p_i32_PingTimeout = 3;
export const p_i32_SendTimeout = 4;
export const p_i32_RecvTimeout = 5;
export const p_i32_WorkInterval = 6;
export const p_u16_SrcRef = 7;
export const p_u16_DstRef = 8;
export const p_u16_SrcTSap = 9;
export const p_i32_PDURequest = 10;
export const p_i32_MaxClients = 11;
export const p_i32_BSendTimeout = 12;
export const p_i32_BRecvTimeout = 13;
export const p_u32_RecoveryTime = 14;
export const p_u32_KeepAliveTime = 15;

// ISO Errors
export const errIsoConnect = 0x00010000;
export const errIsoDisconnect = 0x00020000;
export const errIsoInvalidPDU = 0x00030000;
export const errIsoInvalidDataSize = 0x00040000;
export const errIsoNullPointer = 0x00050000;
export const errIsoShortPacket = 0x00060000;
export const errIsoTooManyFragments = 0x00070000;
export const errIsoPduOverflow = 0x00080000;
export const errIsoSendPacket = 0x00090000;
export const errIsoRecvPacket = 0x000A0000;
export const errIsoInvalidParams = 0x000B0000;

// Client Errors
export const errNegotiatingPDU = 0x00100000;
export const errCliInvalidParams = 0x00200000;
export const errCliJobPending = 0x00300000;
export const errCliTooManyItems = 0x00400000;
export const errCliInvalidWordLen = 0x00500000;
export const errCliPartialDataWritten = 0x00600000;
export const errCliSizeOverPDU = 0x00700000;
export const errCliInvalidPlcAnswer = 0x00800000;
export const errCliAddressOutOfRange = 0x00900000;
export const errCliInvalidTransportSize = 0x00A00000;
export const errCliWriteDataSizeMismatch = 0x00B00000;
export const errCliItemNotAvailable = 0x00C00000;
export const errCliInvalidValue = 0x00D00000;
export const errCliCannotStartPLC = 0x00E00000;
export const errCliAlreadyRun = 0x00F00000;
export const errCliCannotStopPLC = 0x01000000;
export const errCliCannotCopyRamToRom = 0x01100000;
export const errCliCannotCompress = 0x01200000;
export const errCliAlreadyStop = 0x01300000;
export const errCliFunNotAvailable = 0x01400000;
export const errCliUploadSequenceFailed = 0x01500000;
export const errCliInvalidDataSizeRecvd = 0x01600000;
export const errCliInvalidBlockType = 0x01700000;
export const errCliInvalidBlockNumber = 0x01800000;
export const errCliInvalidBlockSize = 0x01900000;
export const errCliDownloadSequenceFailed = 0x01A00000;
export const errCliInsertRefused = 0x01B00000;
export const errCliDeleteRefused = 0x01C00000;
export const errCliNeedPassword = 0x01D00000;
export const errCliInvalidPassword = 0x01E00000;
export const errCliNoPasswordToSetOrClear = 0x01F00000;
export const errCliJobTimeout = 0x02000000;
export const errCliPartialDataRead = 0x02100000;
export const errCliBufferTooSmall = 0x02200000;
export const errCliFunctionRefused = 0x02300000;
export const errCliDestroying = 0x02400000;
export const errCliInvalidParamNumber = 0x02500000;
export const errCliCannotChangeParam = 0x02600000;

// Server Errors
export const errSrvCannotStart = 0x00100000;
export const errSrvDBNullPointer = 0x00200000;
export const errSrvAreaAlreadyExists = 0x00300000;
export const errSrvUnknownArea = 0x00400000;
export const errSrvInvalidParams = 0x00500000;
export const errSrvTooManyDB = 0x00600000;
export const errSrvInvalidParamNumber = 0x00700000;
export const errSrvCannotChangeParam = 0x00800000;

// Server Area IDs
export const srvAreaPE = 0;
export const srvAreaPA = 1;
export const srvAreaMK = 2;
export const srvAreaCT = 3;
export const srvAreaTM = 4;
export const srvAreaDB = 5;

// Server Operation Types
export const OperationRead = 0;
export const OperationWrite = 1;

// Server Event Codes
export const evcServerStarted = 0x00000001;
export const evcServerStopped = 0x00000002;
export const evcListenerCannotStart = 0x00000004;
export const evcClientAdded = 0x00000008;
export const evcClientRejected = 0x00000010;
export const evcClientNoRoom = 0x00000020;
export const evcClientException = 0x00000040;
export const evcClientDisconnected = 0x00000080;
export const evcClientTerminated = 0x00000100;
export const evcClientsDropped = 0x00000200;
export const evcPDUincoming = 0x00010000;
export const evcDataRead = 0x00020000;
export const evcDataWrite = 0x00040000;
export const evcNegotiatePDU = 0x00080000;
export const evcReadSZL = 0x00100000;
export const evcClock = 0x00200000;
export const evcUpload = 0x00400000;
export const evcDownload = 0x00800000;
export const evcDirectory = 0x01000000;
export const evcSecurity = 0x02000000;
export const evcControl = 0x04000000;
export const evcAll = 0xFFFFFFFF;
export const evcNone = 0x00000000;

// Event SubCodes
export const evsUnknown = 0x0000;
export const evsStartUpload = 0x0001;
export const evsStartDownload = 0x0001;
export const evsGetBlockList = 0x0001;
export const evsStartListBoT = 0x0002;
export const evsListBoT = 0x0003;
export const evsGetBlockInfo = 0x0004;
export const evsGetClock = 0x0001;
export const evsSetClock = 0x0002;
export const evsSetPassword = 0x0001;
export const evsClrPassword = 0x0002;

// Event Params - Function Groups
export const grProgrammer = 0x0041;
export const grCyclicData = 0x0042;
export const grBlocksInfo = 0x0043;
export const grSZL = 0x0044;
export const grPassword = 0x0045;
export const grBSend = 0x0046;
export const grClock = 0x0047;
export const grSecurity = 0x0045;

// Event Params - Control Codes
export const CodeControlUnknown = 0x0000;
export const CodeControlColdStart = 0x0001;
export const CodeControlWarmStart = 0x0002;
export const CodeControlStop = 0x0003;
export const CodeControlCompress = 0x0004;
export const CodeControlCpyRamRom = 0x0005;
export const CodeControlInsDel = 0x0006;

// Event Results
export const evrNoError = 0x0000;
export const evrFragmentRejected = 0x0001;
export const evrMalformedPDU = 0x0002;
export const evrSparseBytes = 0x0003;
export const evrCannotHandlePDU = 0x0004;
export const evrNotImplemented = 0x0005;
export const evrErrException = 0x0006;
export const evrErrAreaNotFound = 0x0007;
export const evrErrOutOfRange = 0x0008;
export const evrErrOverPDU = 0x0009;
export const evrErrTransportSize = 0x000A;
export const evrInvalidGroupUData = 0x000B;
export const evrInvalidSZL = 0x000C;
export const evrDataSizeMismatch = 0x000D;
export const evrCannotUpload = 0x000E;
export const evrCannotDownload = 0x000F;
export const evrUploadInvalidID = 0x0010;
export const evrResNotFound = 0x0011;

// Server Status
export const SrvStopped = 0x00;
export const SrvRunning = 0x01;
export const SrvError = 0x02;

// S7 Data Header
export const S7_DATA_HEADER_LEN = 4;
export const S7_READ_HEADER_LEN = 18;  // 12 param + 4 data header + 2 error
export const S7_WRITE_HEADER_LEN = 18;

// S7 Setup Communication offsets
export const S7_SETUP_PARAM_LEN = 8;
export const S7_SETUP_DATA_LEN = 0;

// SZL IDs
export const SZL_ID_LIST = 0x0000;
export const SZL_ID_CPU_INFO = 0x001C;

// Upload/Download subfunctions
export const S7_UD_REQ_DOWNLOAD = 0x1A;
export const S7_UD_REQ_UPLOAD = 0x1D;

// PLC Control subfunctions
export const S7_PLC_START = 0x28;
export const S7_PLC_STOP = 0x29;
export const S7_PLC_HOT_START = 0x02;
export const S7_PLC_COLD_START = 0x01;
export const S7_PLC_COMPRESS = 0x04;
export const S7_PLC_COPY_RAM_ROM = 0x05;

// Security subfunctions
export const S7_SEC_SET_PASSWORD = 0x01;
export const S7_SEC_CLEAR_PASSWORD = 0x02;