bandwidth-client.c
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/*
* Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdio.h>
#ifndef _MSC_VER
#include <sys/time.h>
#include <unistd.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <modbus.h>
#define G_MSEC_PER_SEC 1000
static uint32_t gettime_ms(void)
{
struct timeval tv;
#if !defined(_MSC_VER)
gettimeofday(&tv, NULL);
return (uint32_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
#else
return GetTickCount();
#endif
}
enum {
TCP,
RTU
};
/* Tests based on PI-MBUS-300 documentation */
int main(int argc, char *argv[])
{
uint8_t *tab_bit;
uint16_t *tab_reg;
modbus_t *ctx;
int i;
int nb_points;
double elapsed;
uint32_t start;
uint32_t end;
uint32_t bytes;
uint32_t rate;
int rc;
int n_loop;
int use_backend;
if (argc > 1) {
if (strcmp(argv[1], "tcp") == 0) {
use_backend = TCP;
n_loop = 100000;
} else if (strcmp(argv[1], "rtu") == 0) {
use_backend = RTU;
n_loop = 100;
} else {
printf("Usage:\n %s [tcp|rtu] - Modbus client to measure data bandwidth\n\n",
argv[0]);
exit(1);
}
} else {
/* By default */
use_backend = TCP;
n_loop = 100000;
}
if (use_backend == TCP) {
ctx = modbus_new_tcp("127.0.0.1", 1502);
} else {
ctx = modbus_new_rtu("/dev/ttyUSB1", 115200, 'N', 8, 1);
modbus_set_slave(ctx, 1);
}
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
/* Allocate and initialize the memory to store the status */
tab_bit = (uint8_t *) malloc(MODBUS_MAX_READ_BITS * sizeof(uint8_t));
memset(tab_bit, 0, MODBUS_MAX_READ_BITS * sizeof(uint8_t));
/* Allocate and initialize the memory to store the registers */
tab_reg = (uint16_t *) malloc(MODBUS_MAX_READ_REGISTERS * sizeof(uint16_t));
memset(tab_reg, 0, MODBUS_MAX_READ_REGISTERS * sizeof(uint16_t));
printf("READ BITS\n\n");
nb_points = MODBUS_MAX_READ_BITS;
start = gettime_ms();
for (i = 0; i < n_loop; i++) {
rc = modbus_read_bits(ctx, 0, nb_points, tab_bit);
if (rc == -1) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
return -1;
}
}
end = gettime_ms();
elapsed = end - start;
rate = (n_loop * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfer rate in points/seconds:\n");
printf("* %d points/s\n", rate);
printf("\n");
bytes = n_loop * (nb_points / 8) + ((nb_points % 8) ? 1 : 0);
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("Values:\n");
printf("* %d x %d values\n", n_loop, nb_points);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %d KiB/s\n", rate);
printf("\n");
/* TCP: Query and response header and values */
bytes = 12 + 9 + (nb_points / 8) + ((nb_points % 8) ? 1 : 0);
printf("Values and TCP Modbus overhead:\n");
printf("* %d x %d bytes\n", n_loop, bytes);
bytes = n_loop * bytes;
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %d KiB/s\n", rate);
printf("\n\n");
printf("READ REGISTERS\n\n");
nb_points = MODBUS_MAX_READ_REGISTERS;
start = gettime_ms();
for (i = 0; i < n_loop; i++) {
rc = modbus_read_registers(ctx, 0, nb_points, tab_reg);
if (rc == -1) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
return -1;
}
}
end = gettime_ms();
elapsed = end - start;
rate = (n_loop * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfer rate in points/seconds:\n");
printf("* %d registers/s\n", rate);
printf("\n");
bytes = n_loop * nb_points * sizeof(uint16_t);
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("Values:\n");
printf("* %d x %d values\n", n_loop, nb_points);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %d KiB/s\n", rate);
printf("\n");
/* TCP:Query and response header and values */
bytes = 12 + 9 + (nb_points * sizeof(uint16_t));
printf("Values and TCP Modbus overhead:\n");
printf("* %d x %d bytes\n", n_loop, bytes);
bytes = n_loop * bytes;
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %d KiB/s\n", rate);
printf("\n\n");
printf("WRITE AND READ REGISTERS\n\n");
nb_points = MODBUS_MAX_WR_WRITE_REGISTERS;
start = gettime_ms();
for (i = 0; i < n_loop; i++) {
rc = modbus_write_and_read_registers(
ctx, 0, nb_points, tab_reg, 0, nb_points, tab_reg);
if (rc == -1) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
return -1;
}
}
end = gettime_ms();
elapsed = end - start;
rate = (n_loop * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfer rate in points/seconds:\n");
printf("* %d registers/s\n", rate);
printf("\n");
bytes = n_loop * nb_points * sizeof(uint16_t);
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("Values:\n");
printf("* %d x %d values\n", n_loop, nb_points);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %d KiB/s\n", rate);
printf("\n");
/* TCP:Query and response header and values */
bytes = 12 + 9 + (nb_points * sizeof(uint16_t));
printf("Values and TCP Modbus overhead:\n");
printf("* %d x %d bytes\n", n_loop, bytes);
bytes = n_loop * bytes;
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %d KiB/s\n", rate);
printf("\n");
/* Free the memory */
free(tab_bit);
free(tab_reg);
/* Close the connection */
modbus_close(ctx);
modbus_free(ctx);
return 0;
}