/usr/include/modbus/modbus-tcp.h is in libmodbus-dev 3.0.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | /*
* Copyright © 2001-2010 Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _MODBUS_TCP_H_
#define _MODBUS_TCP_H_
#include "modbus.h"
#if defined(_WIN32) && !defined(__CYGWIN__)
/* Win32 with MinGW, supplement to <errno.h> */
#include <winsock2.h>
#define ECONNRESET WSAECONNRESET
#define ECONNREFUSED WSAECONNREFUSED
#define ETIMEDOUT WSAETIMEDOUT
#define ENOPROTOOPT WSAENOPROTOOPT
#endif
#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_t* modbus_new_tcp(const char *ip_address, int port);
int modbus_tcp_listen(modbus_t *ctx, int nb_connection);
int modbus_tcp_accept(modbus_t *ctx, int *socket);
modbus_t* modbus_new_tcp_pi(const char *node, const char *service);
int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);
int modbus_tcp_pi_accept(modbus_t *ctx, int *socket);
#endif /* _MODBUS_TCP_H_ */
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