src/modbus-tcp.h

   1 /*
   2  * Copyright © 2001-2010 Stéphane Raimbault <stephane.raimbault@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser Public License as published by
   6  * the Free Software Foundation; either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program 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
  12  * GNU Lesser Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef _MODBUS_TCP_H_
  19 #define _MODBUS_TCP_H_
  20
  21 #include "modbus.h"
  22
  23 #if defined(_WIN32) && !defined(__CYGWIN__)
  24 /* Win32 with MinGW, supplement to <errno.h> */
  25 #include <winsock2.h>
  26 #define ECONNRESET   WSAECONNRESET
  27 #define ECONNREFUSED WSAECONNREFUSED
  28 #define ETIMEDOUT    WSAETIMEDOUT
  29 #define ENOPROTOOPT  WSAENOPROTOOPT
  30 #endif
  31
  32 #define MODBUS_TCP_DEFAULT_PORT   502
  33 #define MODBUS_TCP_SLAVE         0xFF
  34
  35 /* Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5
  36  * TCP MODBUS ADU = 253 bytes + MBAP (7 bytes) = 260 bytes
  37  */
  38 #define MODBUS_TCP_MAX_ADU_LENGTH  260
  39
  40 modbus_t* modbus_new_tcp(const char *ip_address, int port);
  41 int modbus_tcp_listen(modbus_t *ctx, int nb_connection);
  42 int modbus_tcp_accept(modbus_t *ctx, int *socket);
  43
  44 modbus_t* modbus_new_tcp_pi(const char *node, const char *service);
  45 int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);
  46 int modbus_tcp_pi_accept(modbus_t *ctx, int *socket);
  47
  48 #endif /* _MODBUS_TCP_H_ */