bandwidth-slave-one.c
2.01 KB
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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
/*
* Copyright © 2008 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 <string.h>
#include <stdlib.h>
#include "modbus.h"
#define SLAVE 0x11
int main(void)
{
int socket;
modbus_param_t mb_param;
modbus_mapping_t mb_mapping;
int ret;
modbus_init_tcp(&mb_param, "127.0.0.1", 1502, SLAVE);
ret = modbus_mapping_new(&mb_mapping, MAX_STATUS, 0, MAX_REGISTERS, 0);
if (ret == FALSE) {
printf("Memory allocation failed\n");
exit(1);
}
socket = modbus_slave_listen_tcp(&mb_param, 1);
modbus_slave_accept_tcp(&mb_param, &socket);
while (1) {
uint8_t query[MAX_MESSAGE_LENGTH];
int query_size;
ret = modbus_slave_receive(&mb_param, -1, query, &query_size);
if (ret == 0) {
modbus_slave_manage(&mb_param, query, query_size, &mb_mapping);
} else if (ret == CONNECTION_CLOSED) {
/* Connection closed by the client, end of server */
break;
} else {
printf("Error in modbus_listen (%d)\n", ret);
}
}
close(socket);
modbus_mapping_free(&mb_mapping);
modbus_close(&mb_param);
return 0;
}