From 6cfbf2dee130cc36a72d57adea0e9c04bb31f620 Mon Sep 17 00:00:00 2001
From: Jonathan McCrohan <jmccrohan@gmail.com>
Date: Wed, 12 Oct 2011 21:50:48 +0100
Subject:  Initial commit

---
 tests/bandwidth-client.c | 220 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 220 insertions(+)
 create mode 100644 tests/bandwidth-client.c

(limited to 'tests/bandwidth-client.c')

diff --git a/tests/bandwidth-client.c b/tests/bandwidth-client.c
new file mode 100644
index 0000000..e9109e1
--- /dev/null
+++ b/tests/bandwidth-client.c
@@ -0,0 +1,220 @@
+/*
+ * 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 <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+#include <errno.h>
+
+#include <modbus.h>
+
+#define G_MSEC_PER_SEC 1000
+
+uint32_t gettime_ms(void)
+{
+    struct timeval tv;
+    gettimeofday (&tv, NULL);
+
+    return (uint32_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
+}
+
+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 bandwith\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, "Connexion 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("Transfert 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 reponse 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("Transfert 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 reponse 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("READ AND WRITE REGISTERS\n\n");
+
+    nb_points = MODBUS_MAX_RW_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("Transfert 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 reponse 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;
+}
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