src/modbus-tcp.h

   1 /*
   2  * Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-or-later
   5  */
   6
   7 #ifndef MODBUS_TCP_H
   8 #define MODBUS_TCP_H
   9
  10 #include "modbus.h"
  11
  12 MODBUS_BEGIN_DECLS
  13
  14 #if defined(_WIN32) && !defined(__CYGWIN__)
  15 /* Win32 with MinGW, supplement to <errno.h> */
  16 #include <winsock2.h>
  17 #if !defined(ECONNRESET)
  18 #define ECONNRESET WSAECONNRESET
  19 #endif
  20 #if !defined(ECONNREFUSED)
  21 #define ECONNREFUSED WSAECONNREFUSED
  22 #endif
  23 #if !defined(ETIMEDOUT)
  24 #define ETIMEDOUT WSAETIMEDOUT
  25 #endif
  26 #if !defined(ENOPROTOOPT)
  27 #define ENOPROTOOPT WSAENOPROTOOPT
  28 #endif
  29 #if !defined(EINPROGRESS)
  30 #define EINPROGRESS WSAEINPROGRESS
  31 #endif
  32 #endif
  33
  34 #define MODBUS_TCP_DEFAULT_PORT 502
  35 #define MODBUS_TCP_SLAVE        0xFF
  36
  37 /* Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5
  38  * TCP MODBUS ADU = 253 bytes + MBAP (7 bytes) = 260 bytes
  39  */
  40 #define MODBUS_TCP_MAX_ADU_LENGTH 260
  41
  42 MODBUS_API modbus_t *modbus_new_tcp(const char *ip_address, int port);
  43 MODBUS_API int modbus_tcp_listen(modbus_t *ctx, int nb_connection);
  44 MODBUS_API int modbus_tcp_accept(modbus_t *ctx, int *s);
  45
  46 MODBUS_API modbus_t *modbus_new_tcp_pi(const char *node, const char *service);
  47 MODBUS_API int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);
  48 MODBUS_API int modbus_tcp_pi_accept(modbus_t *ctx, int *s);
  49
  50 MODBUS_END_DECLS
  51
  52 #endif /* MODBUS_TCP_H */