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/* gpssnmp - poll local gpsd for SNMP variables
*
* To build this:
* gcc -o gpssnmp gpssnmp.c -lgps
*
* Copyright (c) 2016 David Taylor <gpsd@david.taylor.name>
*
* Copyright (c)2018 by the GPSD project
* SPDX-License-Identifier: BSD-2-clause
*
*/
#include <gps.h>
#include <stdio.h>
#include <string.h>
static void usage() {
printf("\n"
"Usage:\n"
"\n"
"to get OID_VISIBLE\n"
" $ gpssnmp -g .1.3.6.1.2.1.25.1.31\n"
" .1.3.6.1.2.1.25.1.31\n"
" gauge\n"
" 13\n"
"\n"
"to get OID_USED\n"
" $ gpssnmp -g .1.3.6.1.2.1.25.1.32\n"
" .1.3.6.1.2.1.25.1.32\n"
" gauge\n"
" 4\n"
"\n"
"to get OID_SNR_AVG\n"
" $ gpssnmp -g .1.3.6.1.2.1.25.1.33\n"
" .1.3.6.1.2.1.25.1.33\n"
" gauge\n"
" 22.250000\n"
"\n");
}
int main (int argc, char **argv) {
struct gps_data_t gpsdata;
#define OID_VISIBLE ".1.3.6.1.2.1.25.1.31"
#define OID_USED ".1.3.6.1.2.1.25.1.32"
#define OID_SNR_AVG ".1.3.6.1.2.1.25.1.33"
if ((argc > 2) && (strcmp ("-g", argv[1]) == 0)) {
int i;
double snr_total=0;
double snr_avg = 0.0;
int status, used, visible;
status = gps_open (GPSD_SHARED_MEMORY, DEFAULT_GPSD_PORT, &gpsdata);
status = gps_read (&gpsdata, NULL, 0);
used = gpsdata.satellites_used;
visible = gpsdata.satellites_visible;
for(i=0; i<=used; i++) {
if (gpsdata.skyview[i].used > 0 && gpsdata.skyview[i].ss > 1) {
// printf ("i: %d, P:%d, ss: %f\n", i, gpsdata.skyview[i].PRN,
// gpsdata.skyview[i].ss);
snr_total+=gpsdata.skyview[i].ss;
}
}
gps_close (&gpsdata);
if (used > 0) {
snr_avg = snr_total / used;
}
if (strcmp (OID_VISIBLE, argv[2]) == 0) {
printf (OID_VISIBLE);
printf ("\n");
printf ("gauge\n");
printf ("%d\n", visible);
}
if (strcmp (OID_USED, argv[2]) == 0) {
printf (OID_USED);
printf ("\n");
printf ("gauge\n");
printf ("%d\n", used);
}
if (strcmp (OID_SNR_AVG, argv[2]) == 0) {
printf (OID_SNR_AVG);
printf ("\n");
printf ("gauge\n");
printf ("%lf\n", snr_avg);
}
} else {
usage();
}
return 0;
}
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