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beacon.c
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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011, 2013, 2014, 2015, 2016, 2017 John Langner, WB2OSZ
//
// 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 2 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/>.
//
/*------------------------------------------------------------------
*
* Module: beacon.c
*
* Purpose: Transmit messages on a fixed schedule.
*
* Description: Transmit periodic messages as specified in the config file.
*
*---------------------------------------------------------------*/
//#define DEBUG 1
#include "direwolf.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include "ax25_pad.h"
#include "textcolor.h"
#include "audio.h"
#include "tq.h"
#include "xmit.h"
#include "config.h"
#include "version.h"
#include "encode_aprs.h"
#include "beacon.h"
#include "latlong.h"
#include "dwgps.h"
#include "log.h"
#include "dlq.h"
#include "aprs_tt.h" // for dw_run_cmd - should relocate someday.
#include "mheard.h"
#if __WIN32__
/*
* Windows doesn't have localtime_r.
* It should have the equivalent localtime_s, with opposite parameter
* order, but I get undefined reference when trying to use it.
*/
struct tm *localtime_r(time_t *clock, struct tm *res)
{
struct tm *tm;
tm = localtime (clock);
memcpy (res, tm, sizeof(struct tm));
return (res);
}
#endif
/*
* Save pointers to configuration settings.
*/
static struct audio_s *g_modem_config_p;
static struct misc_config_s *g_misc_config_p;
static struct igate_config_s *g_igate_config_p;
#if __WIN32__
static unsigned __stdcall beacon_thread (void *arg);
#else
static void * beacon_thread (void *arg);
#endif
static int g_tracker_debug_level = 0; // 1 for data from gps.
// 2 + Smart Beaconing logic.
// 3 + Send transmissions to log file.
void beacon_tracker_set_debug (int level)
{
g_tracker_debug_level = level;
}
static time_t sb_calculate_next_time (time_t now,
float current_speed_mph, float current_course,
time_t last_xmit_time, float last_xmit_course);
static void beacon_send (int j, dwgps_info_t *gpsinfo);
/*-------------------------------------------------------------------
*
* Name: beacon_init
*
* Purpose: Initialize the beacon process.
*
* Inputs: pmodem - Audio device and modem configuration.
* Used only to find valid channels.
*
* pconfig - misc. configuration from config file.
* Beacon stuff ended up here.
*
* pigate - IGate configuration.
* Need this for calculating IGate statistics.
*
*
* Outputs: Remember required information for future use.
*
* Description: Do some validity checking on the beacon configuration.
*
* Start up beacon_thread to actually send the packets
* at the appropriate time.
*
*--------------------------------------------------------------------*/
void beacon_init (struct audio_s *pmodem, struct misc_config_s *pconfig, struct igate_config_s *pigate)
{
time_t now;
struct tm tm;
int j;
int count;
#if __WIN32__
HANDLE beacon_th;
#else
pthread_t beacon_tid;
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("beacon_init ( ... )\n");
#endif
/*
* Save parameters for later use.
*/
g_modem_config_p = pmodem;
g_misc_config_p = pconfig;
g_igate_config_p = pigate;
/*
* Precompute the packet contents so any errors are
* Reported once at start up time rather than for each transmission.
* If a serious error is found, set type to BEACON_IGNORE and that
* table entry should be ignored later on.
*/
// TODO: Better checking.
// We should really have a table for which keywords are are required,
// optional, or not allowed for each beacon type. Options which
// are not applicable are often silently ignored, causing confusion.
for (j=0; j<g_misc_config_p->num_beacons; j++) {
int chan = g_misc_config_p->beacon[j].sendto_chan;
if (chan < 0) chan = 0; /* For IGate, use channel 0 call. */
if (g_modem_config_p->achan[chan].valid) {
if (strlen(g_modem_config_p->achan[chan].mycall) > 0 &&
strcasecmp(g_modem_config_p->achan[chan].mycall, "N0CALL") != 0 &&
strcasecmp(g_modem_config_p->achan[chan].mycall, "NOCALL") != 0) {
switch (g_misc_config_p->beacon[j].btype) {
case BEACON_OBJECT:
/* Object name is required. */
if (strlen(g_misc_config_p->beacon[j].objname) == 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: OBJNAME is required for OBEACON.\n", g_misc_config_p->beacon[j].lineno);
g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
continue;
}
/* Fall thru. Ignore any warning about missing break. */
case BEACON_POSITION:
/* Location is required. */
if (g_misc_config_p->beacon[j].lat == G_UNKNOWN || g_misc_config_p->beacon[j].lon == G_UNKNOWN) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: Latitude and longitude are required.\n", g_misc_config_p->beacon[j].lineno);
g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
continue;
}
/* INFO and INFOCMD are only for Custom Beacon. */
if (g_misc_config_p->beacon[j].custom_info != NULL || g_misc_config_p->beacon[j].custom_infocmd != NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: INFO or INFOCMD are allowed only for custom beacon.\n", g_misc_config_p->beacon[j].lineno);
dw_printf ("INFO and INFOCMD allow you to specify contents of the Information field so it\n");
dw_printf ("so it would not make sense to use these with other beacon types which construct\n");
dw_printf ("the Information field. Perhaps you want to use COMMENT or COMMENTCMD option.\n");
//g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
continue;
}
break;
case BEACON_TRACKER:
{
dwgps_info_t gpsinfo;
dwfix_t fix;
fix = dwgps_read (&gpsinfo);
if (fix == DWFIX_NOT_INIT) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: GPS must be configured to use TBEACON.\n", g_misc_config_p->beacon[j].lineno);
g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
#if __WIN32__
dw_printf ("You must specify the GPSNMEA command in your configuration file.\n");
dw_printf ("This contains the name of the serial port where the receiver is connected.\n");
#else
dw_printf ("You must specify the source of the GPS data in your configuration file.\n");
dw_printf ("It can be either GPSD, meaning the gpsd daemon, or GPSNMEA for\n");
dw_printf ("for a serial port connection with exclusive use.\n");
#endif
}
}
/* INFO and INFOCMD are only for Custom Beacon. */
if (g_misc_config_p->beacon[j].custom_info != NULL || g_misc_config_p->beacon[j].custom_infocmd != NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: INFO or INFOCMD are allowed only for custom beacon.\n", g_misc_config_p->beacon[j].lineno);
dw_printf ("INFO and INFOCMD allow you to specify contents of the Information field so it\n");
dw_printf ("so it would not make sense to use these with other beacon types which construct\n");
dw_printf ("the Information field. Perhaps you want to use COMMENT or COMMENTCMD option.\n");
//g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
continue;
}
break;
case BEACON_CUSTOM:
/* INFO or INFOCMD is required. */
if (g_misc_config_p->beacon[j].custom_info == NULL && g_misc_config_p->beacon[j].custom_infocmd == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: INFO or INFOCMD is required for custom beacon.\n", g_misc_config_p->beacon[j].lineno);
g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
continue;
}
break;
case BEACON_IGATE:
/* Doesn't make sense if IGate is not configured. */
if (strlen(g_igate_config_p->t2_server_name) == 0 ||
strlen(g_igate_config_p->t2_login) == 0 ||
strlen(g_igate_config_p->t2_passcode) == 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: Doesn't make sense to use IBEACON without IGate Configured.\n", g_misc_config_p->beacon[j].lineno);
dw_printf ("IBEACON has been disabled.\n");
g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
continue;
}
break;
case BEACON_IGNORE:
break;
}
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: MYCALL must be set for beacon on channel %d. \n", g_misc_config_p->beacon[j].lineno, chan);
g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
}
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: Invalid channel number %d for beacon. \n", g_misc_config_p->beacon[j].lineno, chan);
g_misc_config_p->beacon[j].btype = BEACON_IGNORE;
}
}
/*
* Calculate first time for each beacon from the 'slot' or 'delay' value.
*/
now = time(NULL);
localtime_r (&now, &tm);
for (j=0; j<g_misc_config_p->num_beacons; j++) {
struct beacon_s *bp = & (g_misc_config_p->beacon[j]);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("beacon[%d] chan=%d, delay=%d, slot=%d, every=%d\n",
j,
bp->sendto_chan,
bp->delay,
bp->slot,
bp->every);
#endif
/*
* If timeslots, there must be a full number of beacon intervals per hour.
*/
#define IS_GOOD(x) ((3600/(x))*(x) == 3600)
if (bp->slot != G_UNKNOWN) {
if ( ! IS_GOOD(bp->every)) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: When using timeslots, there must be a whole number of beacon intervals per hour.\n", bp->lineno);
// Try to make it valid by adjusting up or down.
int n;
for (n=1; ; n++) {
int e;
e = bp->every + n;
if (e > 3600) {
bp->every = 3600;
break;
}
if (IS_GOOD(e)) {
bp->every = e;
break;
}
e = bp->every - n;
if (e < 1) {
bp->every = 1; // Impose a larger minimum?
break;
}
if (IS_GOOD(e)) {
bp->every = e;
break;
}
}
text_color_set(DW_COLOR_ERROR);
dw_printf ("Config file, line %d: Time between slotted beacons has been adjusted to %d seconds.\n", bp->lineno, bp->every);
}
/*
* Determine when next slot time will arrive.
*/
bp->delay = bp->slot - (tm.tm_min * 60 + tm.tm_sec);
while (bp->delay > bp->every) bp->delay -= bp->every;
while (bp->delay < 5) bp->delay += bp->every;
}
g_misc_config_p->beacon[j].next = now + g_misc_config_p->beacon[j].delay;
}
/*
* Start up thread for processing only if at least one is valid.
*/
count = 0;
for (j=0; j<g_misc_config_p->num_beacons; j++) {
if (g_misc_config_p->beacon[j].btype != BEACON_IGNORE) {
count++;
}
}
if (count >= 1) {
#if __WIN32__
beacon_th = (HANDLE)_beginthreadex (NULL, 0, &beacon_thread, NULL, 0, NULL);
if (beacon_th == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Could not create beacon thread\n");
return;
}
#else
int e;
e = pthread_create (&beacon_tid, NULL, beacon_thread, (void *)0);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
perror("Could not create beacon thread");
return;
}
#endif
}
} /* end beacon_init */
/*-------------------------------------------------------------------
*
* Name: beacon_thread
*
* Purpose: Transmit beacons when it is time.
*
* Inputs: g_misc_config_p->beacon
*
* Outputs: g_misc_config_p->beacon[].next_time
*
* Description: Go to sleep until it is time for the next beacon.
* Transmit any beacons scheduled for now.
* Repeat.
*
*--------------------------------------------------------------------*/
#define MIN(x,y) ((x) < (y) ? (x) : (y))
#if __WIN32__
static unsigned __stdcall beacon_thread (void *arg)
#else
static void * beacon_thread (void *arg)
#endif
{
int j; /* Index into array of beacons. */
time_t earliest;
time_t now; /* Current time. */
int number_of_tbeacons; /* Number of tracker beacons. */
/*
* SmartBeaconing state.
*/
time_t sb_prev_time = 0; /* Time of most recent transmission. */
float sb_prev_course = 0; /* Most recent course reported. */
#if DEBUG
struct tm tm;
char hms[20];
now = time(NULL);
localtime_r (&now, &tm);
strftime (hms, sizeof(hms), "%H:%M:%S", &tm);
text_color_set(DW_COLOR_DEBUG);
dw_printf ("beacon_thread: started %s\n", hms);
#endif
/*
* See if any tracker beacons are configured.
* No need to obtain GPS data if none.
*/
number_of_tbeacons = 0;
for (j=0; j<g_misc_config_p->num_beacons; j++) {
if (g_misc_config_p->beacon[j].btype == BEACON_TRACKER) {
number_of_tbeacons++;
}
}
now = time(NULL);
while (1) {
dwgps_info_t gpsinfo;
/*
* Sleep until time for the earliest scheduled or
* the soonest we could transmit due to corner pegging.
*/
earliest = now + 60 * 60;
for (j=0; j<g_misc_config_p->num_beacons; j++) {
if (g_misc_config_p->beacon[j].btype != BEACON_IGNORE) {
earliest = MIN(g_misc_config_p->beacon[j].next, earliest);
}
}
if (g_misc_config_p->sb_configured && number_of_tbeacons > 0) {
earliest = MIN(now + g_misc_config_p->sb_turn_time, earliest);
earliest = MIN(now + g_misc_config_p->sb_fast_rate, earliest);
}
if (earliest > now) {
SLEEP_SEC (earliest - now);
}
/*
* Woke up. See what needs to be done.
*/
now = time(NULL);
#if DEBUG
localtime_r (&now, &tm);
strftime (hms, sizeof(hms), "%H:%M:%S", &tm);
text_color_set(DW_COLOR_DEBUG);
dw_printf ("beacon_thread: woke up %s\n", hms);
#endif
/*
* Get information from GPS if being used.
* This needs to be done before the next scheduled tracker
* beacon because corner pegging make it sooner.
*/
if (number_of_tbeacons > 0) {
dwfix_t fix = dwgps_read (&gpsinfo);
float my_speed_mph = DW_KNOTS_TO_MPH(gpsinfo.speed_knots);
if (g_tracker_debug_level >= 1) {
struct tm tm;
char hms[20];
localtime_r (&now, &tm);
strftime (hms, sizeof(hms), "%H:%M:%S", &tm);
text_color_set(DW_COLOR_DEBUG);
if (fix == 3) {
dw_printf ("%s 3D, %.6f, %.6f, %.1f mph, %.0f\xc2\xb0, %.1f m\n", hms, gpsinfo.dlat, gpsinfo.dlon, my_speed_mph, gpsinfo.track, gpsinfo.altitude);
}
else if (fix == 2) {
dw_printf ("%s 2D, %.6f, %.6f, %.1f mph, %.0f\xc2\xb0\n", hms, gpsinfo.dlat, gpsinfo.dlon, my_speed_mph, gpsinfo.track);
}
else {
dw_printf ("%s No GPS fix\n", hms);
}
}
/* Don't complain here for no fix. */
/* Possibly at the point where about to transmit. */
/*
* Run SmartBeaconing calculation if configured and GPS data available.
*/
if (g_misc_config_p->sb_configured && fix >= DWFIX_2D) {
time_t tnext = sb_calculate_next_time (now,
DW_KNOTS_TO_MPH(gpsinfo.speed_knots), gpsinfo.track,
sb_prev_time, sb_prev_course);
for (j=0; j<g_misc_config_p->num_beacons; j++) {
if (g_misc_config_p->beacon[j].btype == BEACON_TRACKER) {
/* Haven't thought about the consequences of SmartBeaconing */
/* and having more than one tbeacon configured. */
if (tnext < g_misc_config_p->beacon[j].next) {
g_misc_config_p->beacon[j].next = tnext;
}
}
} /* Update next time if sooner. */
} /* apply SmartBeaconing */
} /* tbeacon(s) configured. */
/*
* Send if the time has arrived.
*/
for (j=0; j<g_misc_config_p->num_beacons; j++) {
struct beacon_s *bp = & (g_misc_config_p->beacon[j]);
if (bp->btype == BEACON_IGNORE)
continue;
if (bp->next <= now) {
/* Send the beacon. */
beacon_send (j, &gpsinfo);
/* Calculate when the next one should be sent. */
/* Easy for fixed interval. SmartBeaconing takes more effort. */
if (bp->btype == BEACON_TRACKER) {
if (gpsinfo.fix < DWFIX_2D) {
/* Fix not available so beacon was not sent. */
if (g_misc_config_p->sb_configured) {
/* Try again in a couple seconds. */
bp->next = now + 2;
}
else {
/* Stay with the schedule. */
/* Important for slotted. Might reconsider otherwise. */
bp->next += bp->every;
}
}
else if (g_misc_config_p->sb_configured) {
/* Remember most recent tracker beacon. */
/* Compute next time if not turning. */
sb_prev_time = now;
sb_prev_course = gpsinfo.track;
bp->next = sb_calculate_next_time (now,
DW_KNOTS_TO_MPH(gpsinfo.speed_knots), gpsinfo.track,
sb_prev_time, sb_prev_course);
}
else {
/* Tracker beacon, fixed spacing. */
bp->next += bp->every;
}
}
else {
/* Non-tracker beacon, fixed spacing. */
/* Increment by 'every' so slotted times come out right. */
/* i.e. Don't take relative to now in case there was some delay. */
bp->next += bp->every;
}
} /* if time to send it */
} /* for each configured beacon */
} /* do forever */
#if __WIN32__
return(0); /* unreachable but warning if not here. */
#else
return(NULL);
#endif
} /* end beacon_thread */
/*-------------------------------------------------------------------
*
* Name: sb_calculate_next_time
*
* Purpose: Calculate next transmission time using the SmartBeaconing algorithm.
*
* Inputs: now - Current time.
*
* current_speed_mph - Current speed from GPS.
* Not expecting G_UNKNOWN but should check for it.
*
* current_course - Current direction of travel.
* Could be G_UNKNOWN if stationary.
*
* last_xmit_time - Time of most recent transmission.
*
* last_xmit_course - Direction included in most recent transmission.
*
* Global In: g_misc_config_p->
* sb_configured TRUE if SmartBeaconing is configured.
* sb_fast_speed MPH
* sb_fast_rate seconds
* sb_slow_speed MPH
* sb_slow_rate seconds
* sb_turn_time seconds
* sb_turn_angle degrees
* sb_turn_slope degrees * MPH
*
* Returns: Time of next transmission.
* Could vary from now to sb_slow_rate in the future.
*
* Caution: The algorithm is defined in MPH units. GPS uses knots.
* The caller must be careful about using the proper conversions.
*
*--------------------------------------------------------------------*/
/* Difference between two angles. */
static float heading_change (float a, float b)
{
float diff;
diff = fabs(a - b);
if (diff <= 180.)
return (diff);
else
return (360. - diff);
}
static time_t sb_calculate_next_time (time_t now,
float current_speed_mph, float current_course,
time_t last_xmit_time, float last_xmit_course)
{
int beacon_rate;
time_t next_time;
/*
* Compute time between beacons for travelling in a straight line.
*/
if (current_speed_mph == G_UNKNOWN) {
beacon_rate = (int)roundf((g_misc_config_p->sb_fast_rate + g_misc_config_p->sb_slow_rate) / 2.);
}
else if (current_speed_mph > g_misc_config_p->sb_fast_speed) {
beacon_rate = g_misc_config_p->sb_fast_rate;
}
else if (current_speed_mph < g_misc_config_p->sb_slow_speed) {
beacon_rate = g_misc_config_p->sb_slow_rate;
}
else {
/* Can't divide by 0 assuming sb_slow_speed > 0. */
beacon_rate = (int)roundf(( g_misc_config_p->sb_fast_rate * g_misc_config_p->sb_fast_speed ) / current_speed_mph);
}
if (g_tracker_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("SmartBeaconing: Beacon Rate = %d seconds for %.1f MPH\n", beacon_rate, current_speed_mph);
}
next_time = last_xmit_time + beacon_rate;
/*
* Test for "Corner Pegging" if moving.
*/
if (current_speed_mph != G_UNKNOWN && current_speed_mph >= 1.0 &&
current_course != G_UNKNOWN && last_xmit_course != G_UNKNOWN) {
float change = heading_change(current_course, last_xmit_course);
float turn_threshold = g_misc_config_p->sb_turn_angle +
g_misc_config_p->sb_turn_slope / current_speed_mph;
if (change > turn_threshold &&
now >= last_xmit_time + g_misc_config_p->sb_turn_time) {
if (g_tracker_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("SmartBeaconing: Send now for heading change of %.0f\n", change);
}
next_time = now;
}
}
return (next_time);
} /* end sb_calculate_next_time */
/*-------------------------------------------------------------------
*
* Name: beacon_send
*
* Purpose: Transmit one beacon after it was determined to be time.
*
* Inputs: j Index into beacon configuration array below.
*
* gpsinfo Information from GPS. Used only for TBEACON.
*
* Global In: g_misc_config_p->beacon Array of beacon configurations.
*
* Outputs: Destination(s) specified:
* - Transmit queue.
* - IGate.
* - Simulated reception.
*
* Description: Prepare text in monitor format.
* Convert to packet object.
* Send to desired destination(s).
*
*--------------------------------------------------------------------*/
static void beacon_send (int j, dwgps_info_t *gpsinfo)
{
struct beacon_s *bp = & (g_misc_config_p->beacon[j]);
int strict = 1; /* Strict packet checking because they will go over air. */
char stemp[20];
char info[AX25_MAX_INFO_LEN];
char beacon_text[AX25_MAX_PACKET_LEN];
packet_t pp = NULL;
char mycall[AX25_MAX_ADDR_LEN];
char super_comment[AX25_MAX_INFO_LEN]; // Fixed part + any dynamic part.
/*
* Obtain source call for the beacon.
* This could potentially be different on different channels.
* When sending to IGate server, use call from first radio channel.
*
* Check added in version 1.0a. Previously used index of -1.
*
* Version 1.1 - channel should now be 0 for IGate.
* Type of destination is encoded separately.
*/
strlcpy (mycall, "NOCALL", sizeof(mycall));
assert (bp->sendto_chan >= 0);
strlcpy (mycall, g_modem_config_p->achan[bp->sendto_chan].mycall, sizeof(mycall));
if (strlen(mycall) == 0 || strcmp(mycall, "NOCALL") == 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("MYCALL not set for beacon in config file line %d.\n", bp->lineno);
return;
}
/*
* Prepare the monitor format header.
*
* src > dest [ , via ]
*/
strlcpy (beacon_text, mycall, sizeof(beacon_text));
strlcat (beacon_text, ">", sizeof(beacon_text));
if (bp->dest != NULL) {
strlcat (beacon_text, bp->dest, sizeof(beacon_text));
}
else {
snprintf (stemp, sizeof(stemp), "%s%1d%1d", APP_TOCALL, MAJOR_VERSION, MINOR_VERSION);
strlcat (beacon_text, stemp, sizeof(beacon_text));
}
if (bp->via != NULL) {
strlcat (beacon_text, ",", sizeof(beacon_text));
strlcat (beacon_text, bp->via, sizeof(beacon_text));
}
strlcat (beacon_text, ":", sizeof(beacon_text));
/*
* If the COMMENTCMD option was specified, run specified command to get variable part.
* Result is any fixed part followed by any variable part.
*/
// TODO: test & document.
strlcpy (super_comment, "", sizeof(super_comment));
if (bp->comment != NULL) {
strlcpy (super_comment, bp->comment, sizeof(super_comment));
}
if (bp->commentcmd != NULL) {
char var_comment[AX25_MAX_INFO_LEN];
int k;
/* Run given command to get variable part of comment. */
k = dw_run_cmd (bp->commentcmd, 2, var_comment, sizeof(var_comment));
if (k > 0) {
strlcat (super_comment, var_comment, sizeof(super_comment));
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("xBEACON, config file line %d, COMMENTCMD failure.\n", bp->lineno);
}
}
/*
* Add the info part depending on beacon type.
*/
switch (bp->btype) {
case BEACON_POSITION:
encode_position (bp->messaging, bp->compress,
bp->lat, bp->lon, bp->ambiguity,
(int)roundf(DW_METERS_TO_FEET(bp->alt_m)),
bp->symtab, bp->symbol,
bp->power, bp->height, bp->gain, bp->dir,
G_UNKNOWN, G_UNKNOWN, /* course, speed */
bp->freq, bp->tone, bp->offset,
super_comment,
info, sizeof(info));
strlcat (beacon_text, info, sizeof(beacon_text));
break;
case BEACON_OBJECT:
encode_object (bp->objname, bp->compress, 0, bp->lat, bp->lon, bp->ambiguity,
bp->symtab, bp->symbol,
bp->power, bp->height, bp->gain, bp->dir,
G_UNKNOWN, G_UNKNOWN, /* course, speed */
bp->freq, bp->tone, bp->offset, super_comment,
info, sizeof(info));
strlcat (beacon_text, info, sizeof(beacon_text));
break;
case BEACON_TRACKER:
if (gpsinfo->fix >= DWFIX_2D) {
int coarse; /* Round to nearest integer. retaining unknown state. */
int my_alt_ft;
/* Transmit altitude only if user asked for it. */
/* A positive altitude in the config file enables */
/* transmission of altitude from GPS. */
my_alt_ft = G_UNKNOWN;
if (gpsinfo->fix >= 3 && gpsinfo->altitude != G_UNKNOWN && bp->alt_m > 0) {
my_alt_ft = (int)roundf(DW_METERS_TO_FEET(gpsinfo->altitude));
}
coarse = G_UNKNOWN;
if (gpsinfo->track != G_UNKNOWN) {
coarse = (int)roundf(gpsinfo->track);
}
encode_position (bp->messaging, bp->compress,
gpsinfo->dlat, gpsinfo->dlon, bp->ambiguity, my_alt_ft,
bp->symtab, bp->symbol,
bp->power, bp->height, bp->gain, bp->dir,
coarse, (int)roundf(gpsinfo->speed_knots),
bp->freq, bp->tone, bp->offset,
super_comment,
info, sizeof(info));
strlcat (beacon_text, info, sizeof(beacon_text));
/* Write to log file for testing. */
/* The idea is to run log2gpx and map the result rather than */
/* actually transmitting and relying on someone else to receive */
/* the signals. */
if (g_tracker_debug_level >= 3) {
decode_aprs_t A;
alevel_t alevel;
memset (&A, 0, sizeof(A));
A.g_freq = G_UNKNOWN;
A.g_offset = G_UNKNOWN;
A.g_tone = G_UNKNOWN;
A.g_dcs = G_UNKNOWN;
strlcpy (A.g_src, mycall, sizeof(A.g_src));
A.g_symbol_table = bp->symtab;
A.g_symbol_code = bp->symbol;
A.g_lat = gpsinfo->dlat;
A.g_lon = gpsinfo->dlon;
A.g_speed_mph = DW_KNOTS_TO_MPH(gpsinfo->speed_knots);
A.g_course = coarse;
A.g_altitude_ft = DW_METERS_TO_FEET(gpsinfo->altitude);
/* Fake channel of 999 to distinguish from real data. */
memset (&alevel, 0, sizeof(alevel));
log_write (999, &A, NULL, alevel, 0);
}
}
else {
return; /* No fix. Skip this time. */
}
break;
case BEACON_CUSTOM:
if (bp->custom_info != NULL) {
/* Fixed handcrafted text. */
strlcat (beacon_text, bp->custom_info, sizeof(beacon_text));
}
else if (bp->custom_infocmd != NULL) {
char info_part[AX25_MAX_INFO_LEN];
int k;
/* Run given command to obtain the info part for packet. */
k = dw_run_cmd (bp->custom_infocmd, 2, info_part, sizeof(info_part));
if (k > 0) {
strlcat (beacon_text, info_part, sizeof(beacon_text));
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("CBEACON, config file line %d, INFOCMD failure.\n", bp->lineno);
strlcpy (beacon_text, "", sizeof(beacon_text)); // abort!
}
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Internal error. custom_info is null. %s %d\n", __FILE__, __LINE__);
strlcpy (beacon_text, "", sizeof(beacon_text)); // abort!
}
break;
case BEACON_IGATE: