#ifndef __MODBUSTCP_H
#define __MODBUSTCP_H

// I removed these includes because I've tinkered with the project structure-
// they may need to be re-included........
//#include "TCPIPConfig.h"

//#include "tcpip/tcpip.h"

// Defines which port the server will listen on
#define MODBUS_PORT         502

//Define for buffer size - these sizes are specific for my application
#define HOLDING_REG_SIZE        15
#define INPUT_REG_SIZE          3
//#define MODBUS_RX_BUFFER_SIZE      50
#define MODBUS_RX_BUFFER_SIZE      256      // increased, as we need to receive multiple file record requests in one message
//#define MODBUS_TX_BUFFER_SIZE   50
#define MODBUS_TX_BUFFER_SIZE   256         // increased, as we need to output file records
#define COIL_SIZE_BUFFER_BYTES                1
#define COIL_SIZE_BUFFER_BITS                 3
#define COIL_BIT_MASK                         0x07
#define DISCRETE_INPUT_SIZE      5

//Modbus Functions
#define	ReadCoil              1
#define	ReadDiscreteInputs	  2
#define	ReadHoldingRegister	  3
#define	ReadInputRegister	  4
#define	WriteSingleCoil		  5
#define	WriteSingleRegister	  6
#define	WriteMultipleCoils	  15
#define	WriteMultipleRegister 16
#define	ReadFileRecord  	  20

//Modbus Errors
#define Illegal_Function_Code   0x01u
#define Illegal_Data_Address    0x02u
#define Illegal_Data_Value      0x03u

//Position of the data in the frame
#define MODBUS_UnitID           6
#define MODBUS_FunctionCode     7
#define MODBUS_DataStart       13
#define MODBUS_ExceptionCode    8

//number of words available for READ HOLDING REGISTER
#define MAX_REG_SIZE 50u //is it same as HOLDING REG SIZE

typedef struct
{
    uint8 Val;
    uint8 Addr;

} WORD_VAL1, WORD_BITS1;

//Modbus command structure

typedef struct
{
    uint16 TransactionID;       //Transaction ID
    uint16 ProtocolID;          //Protocol ID
    uint16 Length;                  //Length
    uint8 UnitID;                  //Unit ID
    uint8 FunctionCode;            //Function code
    uint16 StartAddress;        //Starting register address
    uint16 NumberOfRegister;    //Number of registers
} _MODBUS_COMMAND;                //MODBUS_COMMAND

_MODBUS_COMMAND MODBUS_COMMAND;


//Function Prototypes.....omitted for this post...
void MODBUSTCPServer(void);
// etc
// etc


#endif