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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.h>
int main(void)
{
int socket;
modbus_t *ctx;
modbus_mapping_t *mb_mapping;
ctx = modbus_new_tcp("127.0.0.1", 1502);
/* modbus_set_debug(ctx, TRUE); */
mb_mapping = modbus_mapping_new(500, 500, 500, 500);
if (mb_mapping == NULL) {
fprintf(stderr, "Failed to allocate the mapping: %s\n",
modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
socket = modbus_tcp_listen(ctx, 1);
modbus_tcp_accept(ctx, &socket);
for (;;) {
uint8_t query[MODBUS_TCP_MAX_ADU_LENGTH];
int rc;
rc = modbus_receive(ctx, query);
if (rc != -1) {
/* rc is the query size */
modbus_reply(ctx, query, rc, mb_mapping);
} else {
/* Connection closed by the client or error */
break;
}
}
printf("Quit the loop: %s\n", modbus_strerror(errno));
modbus_mapping_free(mb_mapping);
modbus_close(ctx);
modbus_free(ctx);
return 0;
}
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