src/modbus-tcp.h

   1 /*
   2  * Copyright © 2001-2010 Stéphane Raimbault <stephane.raimbault@gmail.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef _MODBUS_TCP_H_
  20 #define _MODBUS_TCP_H_
  21
  22 #include "modbus.h"
  23
  24 MODBUS_BEGIN_DECLS
  25
  26 #if defined(_WIN32) && !defined(__CYGWIN__)
  27 /* Win32 with MinGW, supplement to <errno.h> */
  28 #include <winsock2.h>
  29 #if !defined(ECONNRESET)
  30 #define ECONNRESET   WSAECONNRESET
  31 #endif
  32 #if !defined(ECONNREFUSED)
  33 #define ECONNREFUSED WSAECONNREFUSED
  34 #endif
  35 #if !defined(ETIMEDOUT)
  36 #define ETIMEDOUT    WSAETIMEDOUT
  37 #endif
  38 #if !defined(ENOPROTOOPT)
  39 #define ENOPROTOOPT  WSAENOPROTOOPT
  40 #endif
  41 #if !defined(EINPROGRESS)
  42 #define EINPROGRESS  WSAEINPROGRESS
  43 #endif
  44 #endif
  45
  46 #define MODBUS_TCP_DEFAULT_PORT   502
  47 #define MODBUS_TCP_SLAVE         0xFF
  48
  49 /* Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5
  50  * TCP MODBUS ADU = 253 bytes + MBAP (7 bytes) = 260 bytes
  51  */
  52 #define MODBUS_TCP_MAX_ADU_LENGTH  260
  53
  54 EXPORT modbus_t* modbus_new_tcp(const char *ip_address, int port);
  55 EXPORT int modbus_tcp_listen(modbus_t *ctx, int nb_connection);
  56 EXPORT int modbus_tcp_accept(modbus_t *ctx, int *socket);
  57
  58 EXPORT modbus_t* modbus_new_tcp_pi(const char *node, const char *service);
  59 EXPORT int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);
  60 EXPORT int modbus_tcp_pi_accept(modbus_t *ctx, int *socket);
  61
  62 MODBUS_END_DECLS
  63
  64 #endif /* _MODBUS_TCP_H_ */