gos7

type Client interface {
	/***************start API AG (Automatisationsgerät)***************/
	//Read data blocks from PLC
	AGReadDB(dbNumber int, start int, size int, buffer []byte) (err error)
	//write data blocks into PLC
	AGWriteDB(dbNumber int, start int, size int, buffer []byte) (err error)
	//Read Merkers area from PLC
	AGReadMB(start int, size int, buffer []byte) (err error)
	//Write Merkers from into PLC
	AGWriteMB(start int, size int, buffer []byte) (err error)
	//Read IPI from PLC
	AGReadEB(start int, size int, buffer []byte) (err error)
	//Write IPI into PLC
	AGWriteEB(start int, size int, buffer []byte) (err error)
	//Read IPU from PLC
	AGReadAB(start int, size int, buffer []byte) (err error)
	//Write IPU into PLC
	AGWriteAB(start int, size int, buffer []byte) (err error)
	//Read timer from PLC
	AGReadTM(start int, size int, buffer []byte) (err error)
	//Write timer into PLC
	AGWriteTM(start int, size int, buffer []byte) (err error)
	//Read counter from PLC
	AGReadCT(start int, size int, buffer []byte) (err error)
	//Write counter into PLC
	AGWriteCT(start int, size int, buffer []byte) (err error)
	//multi read area
	AGReadMulti(dataItems []S7DataItem, itemsCount int) (err error)
	//multi write area
	AGWriteMulti(dataItems []S7DataItem, itemsCount int) (err error)
	/*block*/
	DBFill(dbnumber int, fillchar int) error
	DBGet(dbnumber int, usrdata []byte, size int) error
	//general read function with S7 sytax
	Read(variable string, buffer []byte) (value interface{}, err error)
	//Get block  infor in AG area, refer an S7BlockInfor pointer
	GetAgBlockInfo(blocktype int, blocknum int) (info S7BlockInfo, err error)

	/***************start API PG (Programmiergerät)***************/
	/*control*/
	//Hotstart PLC, Puts the CPU in RUN mode performing an HOT START.
	PLCHotStart() error
	//Cold start PLC, change CPU into runmode performing and COLD START
	PLCColdStart() error
	//change CPU to stop mode
	PLCStop() error
	//return CPU status: running/stopped
	PLCGetStatus() (status int, err error)
	/*directory*/
	//list all blocks in PLC, return a Blockslist which contains list of OB, DB, ...
	PGListBlocks() (list S7BlocksList, err error)
	/*security*/
	//set the session password for PLC to meet its security level
	SetSessionPassword(password string) error
	//clear the password set for current session
	ClearSessionPassword() error
	//return the CPU protection level info, refer to: §33.19 of "System Software for S7-300/400 System and Standard Functions"
	//return S7Protection and its properties.
	GetProtection() (protection S7Protection, err error)
	/*system information*/
	//get CPU order code, return S7OrderCode
	GetOrderCode() (info S7OrderCode, err error)
	//get CPU info, return S7CpuInfo and its properties
	GetCPUInfo() (info S7CpuInfo, err error)
	//get CP info, return S7CpInfo and its properties
	GetCPInfo() (info S7CpInfo, err error)
	/*datetime*/
	//read clock on PLC, return a time
	PGClockRead(datetime time.Time) error
	//write clock to PLC with datetime input
	PGClockWrite() (dt time.Time, err error)
}

type ClientHandler interface {
	Packager
	Transporter
}

type Helper struct{}

type Packager interface {
	//reserve for future use
	Verify(request []byte, response []byte) (err error)
}

type ProtocolDataUnit struct {
	Data []byte
}

type S7BlockInfo struct {
	BlkType   int
	BlkNumber int
	BlkLang   int
	BlkFlags  int
	MC7Size   int // The real size in bytes
	LoadSize  int
	LocalData int
	SBBLength int
	CheckSum  int
	Version   int
	// Chars info
	CodeDate string
	IntfDate string
	Author   string
	Family   string
	Header   string
}

type S7BlocksList struct {
	OBList  []int
	FBList  []int
	FCList  []int
	SFBList []int
	SFCList []int
	DBList  []int
	SDBList []int
}

type S7CpInfo struct {
	MaxPduLength   int
	MaxConnections int
	MaxMpiRate     int
	MaxBusRate     int
}

type S7CpuInfo struct {
	ModuleTypeName string
	SerialNumber   string
	ASName         string
	Copyright      string
	ModuleName     string
}

type S7DataItem struct {
	Area     int
	WordLen  int
	DBNumber int
	Start    int
	Amount   int
	Data     []byte
	Error    string
}

type S7Error struct {
	High byte
	Low  byte
}

type S7OrderCode struct {
	Code string // such as "6ES7 151-8AB01-0AB0"
	V1   byte   // Version 1st digit
	V2   byte   // Version 2nd digit
	V3   byte   // Version 3th digit
}

type S7Protection struct {
	// contains filtered or unexported fields
}

type S7SZL struct {
	Header SZLHeader
	Data   []byte
}

type S7SZLList struct {
	Header SZLHeader
	Data   []uint16
}

type SZLHeader struct {
	LengthHeader       uint16
	NumberOfDataRecord uint16
}

type TCPClientHandler struct {
	// contains filtered or unexported fields
}

type Transporter interface {
	Send(request []byte) (response []byte, err error)
}