random-test-slave.c
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/*
* Copyright © 2008-2010 Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <modbus/modbus.h>
#define SLAVE 0x11
int main(void)
{
int socket;
modbus_param_t mb_param;
modbus_mapping_t mb_mapping;
int rc;
modbus_init_tcp(&mb_param, "127.0.0.1", 1502, SLAVE);
/* modbus_set_debug(&mb_param, TRUE); */
rc = modbus_mapping_new(&mb_mapping, 500, 500, 500, 500);
if (rc == -1) {
fprintf(stderr, "Failed to allocate the mapping: %s\n",
modbus_strerror(errno));
return -1;
}
socket = modbus_slave_listen_tcp(&mb_param, 1);
modbus_slave_accept_tcp(&mb_param, &socket);
for (;;) {
uint8_t query[MAX_MESSAGE_LENGTH];
int rc;
rc = modbus_slave_receive(&mb_param, -1, query);
if (rc != -1) {
/* rc is the query size */
modbus_slave_manage(&mb_param, query, rc, &mb_mapping);
} else {
/* Connection closed by the client or error */
break;
}
}
printf("Quit the loop: %s\n", modbus_strerror(errno));
close(socket);
modbus_mapping_free(&mb_mapping);
modbus_close(&mb_param);
return 0;
}