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/*
* modbuslog
*
* Copyright (C) 2011 Jonathan McCrohan
*
* 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/>.
*/
// gcc modbuslog.c -o modbuslog `pkg-config --libs --cflags libmodbus libconfig`
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <sys/select.h>
#include <signal.h>
#include <libconfig.h>
#include <modbus.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <string.h>
#define SLAVE_ID 1
#define START_ADDRESS 0
#define NUMBER_REGISTERS 14
#define DEBUG 1
void minute_check(int signum) {
alarm(60);
}
void find_mac(unsigned char* mac_address) {
int s;
struct ifreq ifr;
s = socket(PF_INET, SOCK_DGRAM, 0);
memset(&ifr, 0x00, sizeof(ifr));
strcpy(ifr.ifr_name, "eth0");
ioctl(s, SIOCGIFHWADDR, &ifr);
close(s);
unsigned char mac_address_internal[6];
sprintf(mac_address_internal, "%.2X%.2X%.2X%.2X%.2X%.2X",
(unsigned char) ifr.ifr_hwaddr.sa_data[0],
(unsigned char) ifr.ifr_hwaddr.sa_data[1],
(unsigned char) ifr.ifr_hwaddr.sa_data[2],
(unsigned char) ifr.ifr_hwaddr.sa_data[3],
(unsigned char) ifr.ifr_hwaddr.sa_data[4],
(unsigned char) ifr.ifr_hwaddr.sa_data[5]);
strcpy(mac_address, mac_address_internal);
}
int main(int argc, char *argv[]) {
const char *CONFIG_FILE = "modbuslog.cfg";
config_t cfg;
//config_setting_t *setting;
unsigned char mac_address[6];
const char *modbus_device_address;
int modbus_baud_rate;
int modbus_data_bits;
const char *modbus_parity;
int modbus_stop_bits;
config_init(&cfg);
find_mac(mac_address);
if (!config_read_file(&cfg, CONFIG_FILE)) {
fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
config_error_line(&cfg), config_error_text(&cfg));
config_destroy(&cfg);
fprintf(stderr, "Unable to find CONFIG_FILE.\n");
return -1;
}
if (!(config_lookup_string(&cfg, "modbus.device", &modbus_device_address)
&& config_lookup_int(&cfg, "modbus.baud", &modbus_baud_rate)
&& config_lookup_int(&cfg, "modbus.data_bits", &modbus_data_bits)
&& config_lookup_string(&cfg, "modbus.parity", &modbus_parity)
&& config_lookup_int(&cfg, "modbus.stop_bits", &modbus_stop_bits))) {
fprintf(stderr,
"Incomplete modbus configuration. Check configuration file.\n");
return -1;
}
if (DEBUG) {
printf("%s %s %d %c %d %d\n", mac_address, modbus_device_address,
modbus_baud_rate, modbus_parity[0], modbus_data_bits,
modbus_stop_bits);
}
modbus_t *ctx;
uint16_t tab_reg[64];
int rc;
int i;
signal(SIGALRM, minute_check);
alarm(60);
for (;;) {
select(0, NULL, NULL, NULL, NULL);
time_t t = time(NULL);
int unixtime_min = (((int) t) / 60 * 60);
//int unixtime = (int) t;
//printf("%d\n", unixtime);
config_setting_t *registers;
registers = config_lookup(&cfg, "register");
unsigned int num_registers = config_setting_length(registers);
int i;
for (i = 0; i < num_registers; ++i) {
config_setting_t *register_element = config_setting_get_elem(
registers, i);
int slaveid;
config_setting_lookup_int(register_element, "slaveid", &slaveid);
int intervalvalue;
config_setting_lookup_int(register_element, "intervalvalue",
&intervalvalue);
//printf("%d", intervalvalue);
int startaddress;
config_setting_lookup_int(register_element, "startaddress",
&startaddress);
int numregisters;
config_setting_lookup_int(register_element, "numregisters",
&numregisters);
const char *intervalunit;
config_setting_lookup_string(register_element, "intervalunit",
&intervalunit);
//printf("%c", intervalunit[0]);
int intervalduration;
if (intervalunit[0] == 'H')
intervalduration = intervalvalue * 3600;
else
intervalduration = intervalvalue * 60;
if (unixtime_min % intervalduration == 0) {
//printf("specified minute. %d %d\n", unixtime_min,
// intervalduration);
ctx = modbus_new_rtu(modbus_device_address, modbus_baud_rate,
modbus_parity[0], modbus_data_bits, modbus_stop_bits);
modbus_set_slave(ctx, slaveid);
modbus_set_debug(ctx, DEBUG);
if (ctx == NULL) {
fprintf(stderr, "Unable to create libmodbus object.\n");
//return -1;
}
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connection failed: %s\n",
modbus_strerror(errno));
modbus_free(ctx);
//return -1;
}
rc = modbus_read_input_registers(ctx, startaddress,
numregisters, tab_reg);
if (rc == -1) {
fprintf(stderr, "ERROR: %s\n", modbus_strerror(errno));
//return -1;
}
for (i = 0; i < rc; i = i + 2) {
printf("reg[%d]=%d\n", i, tab_reg[i] + tab_reg[i + 1]);
}
modbus_close(ctx);
modbus_free(ctx);
//return 0;
}
//printf("%d ", slaveid);
}
//printf("%d\n", unixtime_min);
}
}
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