/*
 * Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

#ifndef MODBUS_RTUOVERUDP_PRIVATE_H
#define MODBUS_RTUOVERUDP_PRIVATE_H

#ifndef _MSC_VER
#include <stdint.h>
#else
#include "stdint.h"
#endif

#if defined(_WIN32)
#include <windows.h>
#else
#include <termios.h>
#endif

#define _MODBUS_RTU_HEADER_LENGTH     1
#define _MODBUS_RTU_PRESET_REQ_LENGTH 6
#define _MODBUS_RTU_PRESET_RSP_LENGTH 2

#define _MODBUS_RTU_CHECKSUM_LENGTH 2

#if defined(_WIN32)
#if !defined(ENOTSUP)
#define ENOTSUP WSAEOPNOTSUPP
#endif

/* WIN32: struct containing serial handle and a receive buffer */
#define PY_BUF_SIZE 512

#endif /* _WIN32 */

typedef struct _modbus_rtuoverudp {
    /* Extract from MODBUS Messaging on TCP/IP Implementation Guide V1.0b
       (page 23/46):
       The transaction identifier is used to associate the future response
       with the request. This identifier is unique on each TCP connection. */
    uint16_t t_id;
    /* TCP port */
    int port;
    /* IP address */
    char ip[16];
    uint8_t msg[512];
    int msg_len;
    int offset;

} modbus_rtuoverudp_t;

#endif /* MODBUS_RTU_PRIVATE_H */