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3rdparty/libmodbus/modbus-tcp.h 1.34 KB
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  /*
   * Copyright © 2001-2010 Stéphane Raimbault <stephane.raimbault@gmail.com>
   *
   * SPDX-License-Identifier: LGPL-2.1+
   */
  
  #ifndef MODBUS_TCP_H
  #define MODBUS_TCP_H
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  #include "modbus.h"
  
  MODBUS_BEGIN_DECLS
  
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  #if defined(_WIN32) && !defined(__CYGWIN__)
  /* Win32 with MinGW, supplement to <errno.h> */
  #include <winsock2.h>
  #if !defined(ECONNRESET)
  #define ECONNRESET   WSAECONNRESET
  #endif
  #if !defined(ECONNREFUSED)
  #define ECONNREFUSED WSAECONNREFUSED
  #endif
  #if !defined(ETIMEDOUT)
  #define ETIMEDOUT    WSAETIMEDOUT
  #endif
  #if !defined(ENOPROTOOPT)
  #define ENOPROTOOPT  WSAENOPROTOOPT
  #endif
  #if !defined(EINPROGRESS)
  #define EINPROGRESS  WSAEINPROGRESS
  #endif
  #endif
  
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  #define MODBUS_TCP_DEFAULT_PORT   502
  #define MODBUS_TCP_SLAVE         0xFF
  
  /* Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5
   * TCP MODBUS ADU = 253 bytes + MBAP (7 bytes) = 260 bytes
   */
  #define MODBUS_TCP_MAX_ADU_LENGTH  260
  
  MODBUS_API modbus_t* modbus_new_tcp(const char *ip_address, int port);
  MODBUS_API int modbus_tcp_listen(modbus_t *ctx, int nb_connection);
  MODBUS_API int modbus_tcp_accept(modbus_t *ctx, int *s);
  
  MODBUS_API modbus_t* modbus_new_tcp_pi(const char *node, const char *service);
  MODBUS_API int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);
  MODBUS_API int modbus_tcp_pi_accept(modbus_t *ctx, int *s);
  
  MODBUS_END_DECLS
  
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  #endif /* MODBUS_TCP_H */