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direwolf/decode_aprs.c

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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011, 2012, 2013, 2014, 2015, 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/>.
//
/*------------------------------------------------------------------
*
* File: decode_aprs.c
*
* Purpose: Decode the information part of APRS frame.
*
* Description: Present the packet contents in human readable format.
* This is a fairly complete implementation with error messages
* pointing out various specication violations.
*
* Assumptions: ax25_from_frame() has been called to
* separate the header and information.
*
*------------------------------------------------------------------*/
#include "direwolf.h"
#include <stdio.h>
#include <time.h>
#include <assert.h>
#include <stdlib.h> /* for atof */
#include <string.h> /* for strtok */
#include <math.h> /* for pow */
#include <ctype.h> /* for isdigit */
#include <fcntl.h>
#include "regex.h"
#include "ax25_pad.h"
#include "textcolor.h"
#include "symbols.h"
#include "latlong.h"
#include "dwgpsnmea.h"
#include "decode_aprs.h"
#include "telemetry.h"
#define TRUE 1
#define FALSE 0
/* Position & symbol fields common to several message formats. */
typedef struct {
char lat[8];
char sym_table_id; /* / \ 0-9 A-Z */
char lon[9];
char symbol_code;
} position_t;
typedef struct {
char sym_table_id; /* / \ a-j A-Z */
/* "The presence of the leading Symbol Table Identifier */
/* instead of a digit indicates that this is a compressed */
/* Position Report and not a normal lat/long report." */
/* "a-j" is not a typographical error. */
/* The first 10 lower case letters represent the overlay */
/* characters of 0-9 in the compressed format. */
char y[4]; /* Compressed Latitude. */
char x[4]; /* Compressed Longitude. */
char symbol_code;
char c; /* Course/speed or altitude. */
char s;
char t ; /* Compression type. */
} compressed_position_t;
/* Range of digits for Base 91 representation. */
#define B91_MIN '!'
#define B91_MAX '{'
#define isdigit91(c) ((c) >= B91_MIN && (c) <= B91_MAX)
//static void print_decoded (decode_aprs_t *A);
static void aprs_ll_pos (decode_aprs_t *A, unsigned char *, int);
static void aprs_ll_pos_time (decode_aprs_t *A, unsigned char *, int);
static void aprs_raw_nmea (decode_aprs_t *A, unsigned char *, int);
static void aprs_mic_e (decode_aprs_t *A, packet_t, unsigned char *, int);
//static void aprs_compressed_pos (decode_aprs_t *A, unsigned char *, int);
static void aprs_message (decode_aprs_t *A, unsigned char *, int, int quiet);
static void aprs_object (decode_aprs_t *A, unsigned char *, int);
static void aprs_item (decode_aprs_t *A, unsigned char *, int);
static void aprs_station_capabilities (decode_aprs_t *A, char *, int);
static void aprs_status_report (decode_aprs_t *A, char *, int);
static void aprs_general_query (decode_aprs_t *A, char *, int, int quiet);
static void aprs_directed_station_query (decode_aprs_t *A, char *addressee, char *query, int quiet);
static void aprs_telemetry (decode_aprs_t *A, char *info, int info_len, int quiet);
static void aprs_raw_touch_tone (decode_aprs_t *A, char *, int);
static void aprs_morse_code (decode_aprs_t *A, char *, int);
static void aprs_positionless_weather_report (decode_aprs_t *A, unsigned char *, int);
static void weather_data (decode_aprs_t *A, char *wdata, int wind_prefix);
static void aprs_ultimeter (decode_aprs_t *A, char *, int);
static void third_party_header (decode_aprs_t *A, char *, int);
static void decode_position (decode_aprs_t *A, position_t *ppos);
static void decode_compressed_position (decode_aprs_t *A, compressed_position_t *ppos);
static double get_latitude_8 (char *p, int quiet);
static double get_longitude_9 (char *p, int quiet);
static time_t get_timestamp (decode_aprs_t *A, char *p);
static int get_maidenhead (decode_aprs_t *A, char *p);
static int data_extension_comment (decode_aprs_t *A, char *pdext);
static void decode_tocall (decode_aprs_t *A, char *dest);
//static void get_symbol (decode_aprs_t *A, char dti, char *src, char *dest);
static void process_comment (decode_aprs_t *A, char *pstart, int clen);
/*------------------------------------------------------------------
*
* Function: decode_aprs
*
* Purpose: Split APRS packet into separate properties that it contains.
*
* Inputs: pp - APRS packet object.
*
* quiet - Suppress error messages.
*
* Outputs: A-> g_symbol_table, g_symbol_code,
* g_lat, g_lon,
* g_speed_mph, g_course, g_altitude_ft,
* g_comment
* ... and many others...
*
* Major Revisions: 1.1 Reorganized so parts are returned in a structure.
* Print function is now called separately.
*
*------------------------------------------------------------------*/
void decode_aprs (decode_aprs_t *A, packet_t pp, int quiet)
{
char dest[AX25_MAX_ADDR_LEN];
unsigned char *pinfo;
int info_len;
info_len = ax25_get_info (pp, &pinfo);
memset (A, 0, sizeof (*A));
A->g_quiet = quiet;
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "Unknown APRS Data Type Indicator \"%c\"", *pinfo);
A->g_symbol_table = '/'; /* Default to primary table. */
A->g_symbol_code = ' '; /* What should we have for default symbol? */
A->g_lat = G_UNKNOWN;
A->g_lon = G_UNKNOWN;
A->g_speed_mph = G_UNKNOWN;
A->g_course = G_UNKNOWN;
A->g_power = G_UNKNOWN;
A->g_height = G_UNKNOWN;
A->g_gain = G_UNKNOWN;
A->g_range = G_UNKNOWN;
A->g_altitude_ft = G_UNKNOWN;
A->g_freq = G_UNKNOWN;
A->g_tone = G_UNKNOWN;
A->g_dcs = G_UNKNOWN;
A->g_offset = G_UNKNOWN;
A->g_footprint_lat = G_UNKNOWN;
A->g_footprint_lon = G_UNKNOWN;
A->g_footprint_radius = G_UNKNOWN;
/*
* Extract source and destination including the SSID.
*/
ax25_get_addr_with_ssid (pp, AX25_SOURCE, A->g_src);
ax25_get_addr_with_ssid (pp, AX25_DESTINATION, dest);
/*
* Report error if the information part contains a nul character.
* There are two known cases where this can happen.
*
* - The Kenwood TM-D710A sometimes sends packets like this:
*
* VA3AJ-9>T2QU6X,VE3WRC,WIDE1,K8UNS,WIDE2*:4P<0x00><0x0f>4T<0x00><0x0f>4X<0x00><0x0f>4\<0x00>`nW<0x1f>oS8>/]"6M}driving fast=
* K4JH-9>S5UQ6X,WR4AGC-3*,WIDE1*:4P<0x00><0x0f>4T<0x00><0x0f>4X<0x00><0x0f>4\<0x00>`jP}l"&>/]"47}QRV from the EV =
*
* Notice that the data type indicator of "4" is not valid. If we remove
* 4P<0x00><0x0f>4T<0x00><0x0f>4X<0x00><0x0f>4\<0x00> we are left with a good MIC-E format.
* This same thing has been observed from others and is intermittent.
*
* - AGW Tracker can send UTF-16 if an option is selected. This can introduce nul bytes.
* This is wrong, it should be using UTF-8.
*/
if ( ( ! A->g_quiet ) && ( (int)strlen((char*)pinfo) != info_len) ) {
text_color_set(DW_COLOR_ERROR);
dw_printf("'nul' character found in Information part. This should never happen.\n");
dw_printf("It seems that %s is transmitting with defective software.\n", A->g_src);
if (strcmp((char*)pinfo, "4P") == 0) {
dw_printf("The TM-D710 will do this intermittently. A firmware upgrade is needed to fix it.\n");
}
}
switch (*pinfo) { /* "DTI" data type identifier. */
case '!': /* Position without timestamp (no APRS messaging). */
/* or Ultimeter 2000 WX Station */
case '=': /* Position without timestamp (with APRS messaging). */
if (strncmp((char*)pinfo, "!!", 2) == 0)
{
aprs_ultimeter (A, (char*)pinfo, info_len);
}
else
{
aprs_ll_pos (A, pinfo, info_len);
}
break;
//case '#': /* Peet Bros U-II Weather station */
//case '*': /* Peet Bros U-II Weather station */
//break;
case '$': /* Raw GPS data or Ultimeter 2000 */
if (strncmp((char*)pinfo, "$ULTW", 5) == 0)
{
aprs_ultimeter (A, (char*)pinfo, info_len);
}
else
{
aprs_raw_nmea (A, pinfo, info_len);
}
break;
case '\'': /* Old Mic-E Data (but Current data for TM-D700) */
case '`': /* Current Mic-E Data (not used in TM-D700) */
aprs_mic_e (A, pp, pinfo, info_len);
break;
case ')': /* Item. */
aprs_item (A, pinfo, info_len);
break;
case '/': /* Position with timestamp (no APRS messaging) */
case '@': /* Position with timestamp (with APRS messaging) */
aprs_ll_pos_time (A, pinfo, info_len);
break;
case ':': /* Message: for one person, a group, or a bulletin. */
/* Directed Station Query */
/* Telemetry metadata. */
aprs_message (A, pinfo, info_len, quiet);
break;
case ';': /* Object */
aprs_object (A, pinfo, info_len);
break;
case '<': /* Station Capabilities */
aprs_station_capabilities (A, (char*)pinfo, info_len);
break;
case '>': /* Status Report */
aprs_status_report (A, (char*)pinfo, info_len);
break;
case '?': /* General Query */
aprs_general_query (A, (char*)pinfo, info_len, quiet);
break;
case 'T': /* Telemetry */
aprs_telemetry (A, (char*)pinfo, info_len, quiet);
break;
case '_': /* Positionless Weather Report */
aprs_positionless_weather_report (A, pinfo, info_len);
break;
case '{': /* user defined data */
/* http://www.aprs.org/aprs11/expfmts.txt */
if (strncmp((char*)pinfo, "{tt", 3) == 0) {
aprs_raw_touch_tone (A, (char*)pinfo, info_len);
}
else if (strncmp((char*)pinfo, "{mc", 3) == 0) {
aprs_morse_code (A, (char*)pinfo, info_len);
}
else {
//aprs_user_defined (A, pinfo, info_len);
}
break;
case 't': /* Raw touch tone data - NOT PART OF STANDARD */
/* Used to convey raw touch tone sequences to */
/* to an application that might want to interpret them. */
/* Might move into user defined data, above. */
aprs_raw_touch_tone (A, (char*)pinfo, info_len);
break;
case 'm': /* Morse Code data - NOT PART OF STANDARD */
/* Used by APRStt gateway to put audible responses */
/* into the transmit queue. Could potentially find */
/* other uses such as CW ID for station. */
/* Might move into user defined data, above. */
aprs_morse_code (A, (char*)pinfo, info_len);
break;
case '}': /* third party header */
third_party_header (A, (char*)pinfo, info_len);
break;
//case '\r': /* CR or LF? */
//case '\n':
//break;
default:
break;
}
/*
* Look in other locations if not found in information field.
*/
if (A->g_symbol_table == ' ' || A->g_symbol_code == ' ') {
symbols_from_dest_or_src (*pinfo, A->g_src, dest, &A->g_symbol_table, &A->g_symbol_code);
}
/*
* Application might be in the destination field for most message types.
* MIC-E format has part of location in the destination field.
*/
switch (*pinfo) { /* "DTI" data type identifier. */
case '\'': /* Old Mic-E Data */
case '`': /* Current Mic-E Data */
break;
default:
decode_tocall (A, dest);
break;
}
} /* end decode_aprs */
void decode_aprs_print (decode_aprs_t *A) {
char stemp[200];
//char tmp2[2];
double absll;
char news;
int deg;
double min;
char s_lat[30];
char s_lon[30];
int n;
char symbol_description[100];
/*
* First line has:
* - message type
* - object name
* - symbol
* - manufacturer/application
* - mic-e status
* - power/height/gain, range
*/
strlcpy (stemp, A->g_msg_type, sizeof(stemp));
if (strlen(A->g_name) > 0) {
strlcat (stemp, ", \"", sizeof(stemp));
strlcat (stemp, A->g_name, sizeof(stemp));
strlcat (stemp, "\"", sizeof(stemp));
}
if (A->g_symbol_code != ' ') {
symbols_get_description (A->g_symbol_table, A->g_symbol_code, symbol_description, sizeof(symbol_description));
strlcat (stemp, ", ", sizeof(stemp));
strlcat (stemp, symbol_description, sizeof(stemp));
}
if (strlen(A->g_mfr) > 0) {
strlcat (stemp, ", ", sizeof(stemp));
strlcat (stemp, A->g_mfr, sizeof(stemp));
}
if (strlen(A->g_mic_e_status) > 0) {
strlcat (stemp, ", ", sizeof(stemp));
strlcat (stemp, A->g_mic_e_status, sizeof(stemp));
}
if (A->g_power > 0) {
char phg[100];
/* Protcol spec doesn't mention whether this is dBd or dBi. */
/* Clarified later. */
/* http://eng.usna.navy.mil/~bruninga/aprs/aprs11.html */
/* "The Antenna Gain in the PHG format on page 28 is in dBi." */
snprintf (phg, sizeof(phg), ", %d W height=%d %ddBi %s", A->g_power, A->g_height, A->g_gain, A->g_directivity);
strlcat (stemp, phg, sizeof(stemp));
}
if (A->g_range > 0) {
char rng[100];
snprintf (rng, sizeof(rng), ", range=%.1f", A->g_range);
strlcat (stemp, rng, sizeof(stemp));
}
text_color_set(DW_COLOR_DECODED);
dw_printf("%s\n", stemp);
/*
* Second line has:
* - Latitude
* - Longitude
* - speed
* - direction
* - altitude
* - frequency
*/
/*
* Convert Maidenhead locator to latitude and longitude.
*
* Any example was checked for each hemihemisphere using
* http://www.amsat.org/cgi-bin/gridconv
*/
if (strlen(A->g_maidenhead) > 0) {
if (A->g_lat == G_UNKNOWN && A->g_lon == G_UNKNOWN) {
ll_from_grid_square (A->g_maidenhead, &(A->g_lat), &(A->g_lon));
}
dw_printf("Grid square = %s, ", A->g_maidenhead);
}
strlcpy (stemp, "", sizeof(stemp));
if (A->g_lat != G_UNKNOWN || A->g_lon != G_UNKNOWN) {
// Have location but it is posible one part is invalid.
if (A->g_lat != G_UNKNOWN) {
if (A->g_lat >= 0) {
absll = A->g_lat;
news = 'N';
}
else {
absll = - A->g_lat;
news = 'S';
}
deg = (int) absll;
min = (absll - deg) * 60.0;
snprintf (s_lat, sizeof(s_lat), "%c %02d%s%07.4f", news, deg, CH_DEGREE, min);
}
else {
strlcpy (s_lat, "Invalid Latitude", sizeof(s_lat));
}
if (A->g_lon != G_UNKNOWN) {
if (A->g_lon >= 0) {
absll = A->g_lon;
news = 'E';
}
else {
absll = - A->g_lon;
news = 'W';
}
deg = (int) absll;
min = (absll - deg) * 60.0;
snprintf (s_lon, sizeof(s_lon), "%c %03d%s%07.4f", news, deg, CH_DEGREE, min);
}
else {
strlcpy (s_lon, "Invalid Longitude", sizeof(s_lon));
}
snprintf (stemp, sizeof(stemp), "%s, %s", s_lat, s_lon);
}
if (strlen(A->g_aprstt_loc) > 0) {
if (strlen(stemp) > 0) strlcat (stemp, ", ", sizeof(stemp));
strlcat (stemp, A->g_aprstt_loc, sizeof(stemp));
};
if (A->g_speed_mph != G_UNKNOWN) {
char spd[20];
if (strlen(stemp) > 0) strlcat (stemp, ", ", sizeof(stemp));
snprintf (spd, sizeof(spd), "%.0f MPH", A->g_speed_mph);
strlcat (stemp, spd, sizeof(stemp));
};
if (A->g_course != G_UNKNOWN) {
char cse[20];
if (strlen(stemp) > 0) strlcat (stemp, ", ", sizeof(stemp));
snprintf (cse, sizeof(cse), "course %.0f", A->g_course);
strlcat (stemp, cse, sizeof(stemp));
};
if (A->g_altitude_ft != G_UNKNOWN) {
char alt[20];
if (strlen(stemp) > 0) strlcat (stemp, ", ", sizeof(stemp));
snprintf (alt, sizeof(alt), "alt %.0f ft", A->g_altitude_ft);
strlcat (stemp, alt, sizeof(stemp));
};
if (A->g_freq != G_UNKNOWN) {
char ftemp[30];
snprintf (ftemp, sizeof(ftemp), ", %.3f MHz", A->g_freq);
strlcat (stemp, ftemp, sizeof(stemp));
}
if (A->g_offset != G_UNKNOWN) {
char ftemp[30];
if (A->g_offset % 1000 == 0) {
snprintf (ftemp, sizeof(ftemp), ", %+dM", A->g_offset/1000);
}
else {
snprintf (ftemp, sizeof(ftemp), ", %+dk", A->g_offset);
}
strlcat (stemp, ftemp, sizeof(stemp));
}
if (A->g_tone != G_UNKNOWN) {
if (A->g_tone == 0) {
strlcat (stemp, ", no PL", sizeof(stemp));
}
else {
char ftemp[30];
snprintf (ftemp, sizeof(ftemp), ", PL %.1f", A->g_tone);
strlcat (stemp, ftemp, sizeof(stemp));
}
}
if (A->g_dcs != G_UNKNOWN) {
char ftemp[30];
snprintf (ftemp, sizeof(ftemp), ", DCS %03o", A->g_dcs);
strlcat (stemp, ftemp, sizeof(stemp));
}
if (strlen (stemp) > 0) {
text_color_set(DW_COLOR_DECODED);
dw_printf("%s\n", stemp);
}
/*
* Finally, any weather and/or comment.
*
* Non-printable characters are changed to safe hexadecimal representations.
* For example, carriage return is displayed as <0x0d>.
*
* Drop annoying trailing CR LF. Anyone who cares can see it in the raw datA->
*/
n = strlen(A->g_weather);
if (n >= 1 && A->g_weather[n-1] == '\n') {
A->g_weather[n-1] = '\0';
n--;
}
if (n >= 1 && A->g_weather[n-1] == '\r') {
A->g_weather[n-1] = '\0';
n--;
}
if (n > 0) {
ax25_safe_print (A->g_weather, -1, 0);
dw_printf("\n");
}
if (strlen(A->g_telemetry) > 0) {
ax25_safe_print (A->g_telemetry, -1, 0);
dw_printf("\n");
}
n = strlen(A->g_comment);
if (n >= 1 && A->g_comment[n-1] == '\n') {
A->g_comment[n-1] = '\0';
n--;
}
if (n >= 1 && A->g_comment[n-1] == '\r') {
A->g_comment[n-1] = '\0';
n--;
}
if (n > 0) {
int j;
ax25_safe_print (A->g_comment, -1, 0);
dw_printf("\n");
/*
* Point out incorrect attempts a degree symbol.
* 0xb0 is degree in ISO Latin1.
* To be part of a valid UTF-8 sequence, it would need to be preceded by 11xxxxxx or 10xxxxxx.
* 0xf8 is degree in Microsoft code page 437.
* To be part of a valid UTF-8 sequence, it would need to be followed by 10xxxxxx.
*/
if ( ! A->g_quiet) {
for (j=0; j<n; j++) {
if ((unsigned char)(A->g_comment[j]) == 0xb0 && (j == 0 || ! (A->g_comment[j-1] & 0x80))) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Character code 0xb0 is probably an attempt at a degree symbol.\n");
dw_printf("The correct encoding is 0xc2 0xb0 in UTF-8.\n");
}
}
for (j=0; j<n; j++) {
if ((unsigned char)(A->g_comment[j]) == 0xf8 && (j == n-1 || (A->g_comment[j+1] & 0xc0) != 0xc0)) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Character code 0xf8 is probably an attempt at a degree symbol.\n");
dw_printf("The correct encoding is 0xc2 0xb0 in UTF-8.\n");
}
}
}
}
}
/*------------------------------------------------------------------
*
* Function: aprs_ll_pos
*
* Purpose: Decode "Lat/Long Position Report - without Timestamp"
*
* Reports without a timestamp can be regarded as real-time.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A->g_lat, A->g_lon, A->g_symbol_table, A->g_symbol_code, A->g_speed_mph, A->g_course, A->g_altitude_ft.
*
* Description: Type identifier '=' has APRS messaging.
* Type identifier '!' does not have APRS messaging.
*
* The location can be in either compressed or human-readable form.
*
* When the symbol code is '_' this is a weather report.
*
* Examples: !4309.95NS07307.13W#PHG3320 W2,NY2 Mt Equinox VT k2lm@arrl.net
* !4237.14NS07120.83W#
* =4246.40N/07115.15W# {UIV32}
*
* TODO: (?) Special case, DF report when sym table id = '/' and symbol code = '\'.
*
* =4903.50N/07201.75W\088/036/270/729
*
*------------------------------------------------------------------*/
static void aprs_ll_pos (decode_aprs_t *A, unsigned char *info, int ilen)
{
struct aprs_ll_pos_s {
char dti; /* ! or = */
position_t pos;
char comment[43]; /* Start of comment could be data extension(s). */
} *p;
struct aprs_compressed_pos_s {
char dti; /* ! or = */
compressed_position_t cpos;
char comment[40]; /* No data extension allowed for compressed location. */
} *q;
strlcpy (A->g_msg_type, "Position", sizeof(A->g_msg_type));
p = (struct aprs_ll_pos_s *)info;
q = (struct aprs_compressed_pos_s *)info;
if (isdigit((unsigned char)(p->pos.lat[0]))) /* Human-readable location. */
{
decode_position (A, &(p->pos));
if (A->g_symbol_code == '_') {
/* Symbol code indidates it is a weather report. */
/* In this case, we expect 7 byte "data extension" */
/* for the wind direction and speed. */
strlcpy (A->g_msg_type, "Weather Report", sizeof(A->g_msg_type));
weather_data (A, p->comment, TRUE);
}
else {
/* Regular position report. */
data_extension_comment (A, p->comment);
}
}
else /* Compressed location. */
{
decode_compressed_position (A, &(q->cpos));
if (A->g_symbol_code == '_') {
/* Symbol code indidates it is a weather report. */
/* In this case, the wind direction and speed are in the */
/* compressed data so we don't expect a 7 byte "data */
/* extension" for them. */
strlcpy (A->g_msg_type, "Weather Report", sizeof(A->g_msg_type));
weather_data (A, q->comment, FALSE);
}
else {
/* Regular position report. */
process_comment (A, q->comment, -1);
}
}
}
/*------------------------------------------------------------------
*
* Function: aprs_ll_pos_time
*
* Purpose: Decode "Lat/Long Position Report - with Timestamp"
*
* Reports sent with a timestamp might contain very old information.
*
* Otherwise, same as above.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A->g_lat, A->g_lon, A->g_symbol_table, A->g_symbol_code, A->g_speed_mph, A->g_course, A->g_altitude_ft.
*
* Description: Type identifier '@' has APRS messaging.
* Type identifier '/' does not have APRS messaging.
*
* The location can be in either compressed or human-readable form.
*
* When the symbol code is '_' this is a weather report.
*
* Examples: @041025z4232.32N/07058.81W_124/000g000t036r000p000P000b10229h65/wx rpt
* @281621z4237.55N/07120.20W_017/002g006t022r000p000P000h85b10195.Dvs
* /092345z4903.50N/07201.75W>Test1234
*
* I think the symbol code of "_" indicates weather report.
*
* (?) Special case, DF report when sym table id = '/' and symbol code = '\'.
*
* @092345z4903.50N/07201.75W\088/036/270/729
* /092345z4903.50N/07201.75W\000/000/270/729
*
*------------------------------------------------------------------*/
static void aprs_ll_pos_time (decode_aprs_t *A, unsigned char *info, int ilen)
{
struct aprs_ll_pos_time_s {
char dti; /* / or @ */
char time_stamp[7];
position_t pos;
char comment[43]; /* First 7 bytes could be data extension. */
} *p;
struct aprs_compressed_pos_time_s {
char dti; /* / or @ */
char time_stamp[7];
compressed_position_t cpos;
char comment[40]; /* No data extension in this case. */
} *q;
strlcpy (A->g_msg_type, "Position with time", sizeof(A->g_msg_type));
time_t ts = 0;
p = (struct aprs_ll_pos_time_s *)info;
q = (struct aprs_compressed_pos_time_s *)info;
if (isdigit((unsigned char)(p->pos.lat[0]))) /* Human-readable location. */
{
ts = get_timestamp (A, p->time_stamp);
decode_position (A, &(p->pos));
if (A->g_symbol_code == '_') {
/* Symbol code indidates it is a weather report. */
/* In this case, we expect 7 byte "data extension" */
/* for the wind direction and speed. */
strlcpy (A->g_msg_type, "Weather Report", sizeof(A->g_msg_type));
weather_data (A, p->comment, TRUE);
}
else {
/* Regular position report. */
data_extension_comment (A, p->comment);
}
}
else /* Compressed location. */
{
ts = get_timestamp (A, p->time_stamp);
decode_compressed_position (A, &(q->cpos));
if (A->g_symbol_code == '_') {
/* Symbol code indidates it is a weather report. */
/* In this case, the wind direction and speed are in the */
/* compressed data so we don't expect a 7 byte "data */
/* extension" for them. */
strlcpy (A->g_msg_type, "Weather Report", sizeof(A->g_msg_type));
weather_data (A, q->comment, FALSE);
}
else {
/* Regular position report. */
process_comment (A, q->comment, -1);
}
}
(void)(ts); // suppress 'set but not used' warning.
}
/*------------------------------------------------------------------
*
* Function: aprs_raw_nmea
*
* Purpose: Decode "Raw NMEA Position Report"
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A-> ...
*
* Description: APRS recognizes raw ASCII data strings conforming to the NMEA 0183
* Version 2.0 specification, originating from navigation equipment such
* as GPS and LORAN receivers. It is recommended that APRS stations
* interpret at least the following NMEA Received Sentence types:
*
* GGA Global Positioning System Fix Data
* GLL Geographic Position, Latitude/Longitude Data
* RMC Recommended Minimum Specific GPS/Transit Data
* VTG Velocity and Track Data
* WPL Way Point Location
*
* We presently recognize only RMC and GGA.
*
* Examples: $GPGGA,102705,5157.9762,N,00029.3256,W,1,04,2.0,75.7,M,47.6,M,,*62
* $GPGLL,2554.459,N,08020.187,W,154027.281,A
* $GPRMC,063909,A,3349.4302,N,11700.3721,W,43.022,89.3,291099,13.6,E*52
* $GPVTG,318.7,T,,M,35.1,N,65.0,K*69
*
*------------------------------------------------------------------*/
static void aprs_raw_nmea (decode_aprs_t *A, unsigned char *info, int ilen)
{
if (strncmp((char*)info, "$GPRMC,", 7) == 0)
{
float speed_knots = G_UNKNOWN;
(void) dwgpsnmea_gprmc ((char*)info, A->g_quiet, &(A->g_lat), &(A->g_lon), &speed_knots, &(A->g_course));
A->g_speed_mph = DW_KNOTS_TO_MPH(speed_knots);
}
else if (strncmp((char*)info, "$GPGGA,", 7) == 0)
{
float alt_meters = G_UNKNOWN;
int num_sat = 0;
(void) dwgpsnmea_gpgga ((char*)info, A->g_quiet, &(A->g_lat), &(A->g_lon), &alt_meters, &num_sat);
A->g_altitude_ft = DW_METERS_TO_FEET(alt_meters);
}
// TODO (low): add a few other sentence types.
} /* end aprs_raw_nmea */
/*------------------------------------------------------------------
*
* Function: aprs_mic_e
*
* Purpose: Decode MIC-E (also Kenwood D7 & D700) packet.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs:
*
* Description:
*
* Destination Address Field -
*
* The 7-byte Destination Address field contains
* the following encoded information:
*
* * The 6 latitude digits.
* * A 3-bit Mic-E message identifier, specifying one of 7 Standard Mic-E
* Message Codes or one of 7 Custom Message Codes or an Emergency
* Message Code.
* * The North/South and West/East Indicators.
* * The Longitude Offset Indicator.
* * The generic APRS digipeater path code.
*
* "Although the destination address appears to be quite unconventional, it is
* still a valid AX.25 address, consisting only of printable 7-bit ASCII values."
*
* References: Mic-E TYPE CODES -- http://www.aprs.org/aprs12/mic-e-types.txt
*
* Mic-E TEST EXAMPLES -- http://www.aprs.org/aprs12/mic-e-examples.txt
*
* Examples: `b9Z!4y>/>"4N}Paul's_TH-D7
*
* TODO: Destination SSID can contain generic digipeater path.
*
* Bugs: Doesn't handle ambiguous position. "space" treated as zero.
* Invalid data results in a message but latitude is not set to unknown.
*
*------------------------------------------------------------------*/
/* a few test cases
# example from http://www.aprs.org/aprs12/mic-e-examples.txt produces 4 errors.
# TODO: Analyze all the bits someday and possibly report problem with document.
N0CALL>ABCDEF:'abc123R/text
# Let's use an actual valid location and concentrate on the manufacturers
# as listed in http://www.aprs.org/aprs12/mic-e-types.txt
N1ZZN-9>T2SP0W:`c_Vm6hk/`"49}Jeff Mobile_%
N1ZZN-9>T2SP0W:`c_Vm6hk/ "49}Originl Mic-E (leading space)
N1ZZN-9>T2SP0W:`c_Vm6hk/>"49}TH-D7A walkie Talkie
N1ZZN-9>T2SP0W:`c_Vm6hk/>"49}TH-D72 walkie Talkie=
W6GPS>S4PT3R:`p(1oR0K\>TH-D74A^
N1ZZN-9>T2SP0W:`c_Vm6hk/]"49}TM-D700 MObile Radio
N1ZZN-9>T2SP0W:`c_Vm6hk/]"49}TM-D710 Mobile Radio=
# Note: next line has trailing space character after _
N1ZZN-9>T2SP0W:`c_Vm6hk/`"49}Yaesu VX-8_
N1ZZN-9>T2SP0W:`c_Vm6hk/`"49}Yaesu FTM-350_"
N1ZZN-9>T2SP0W:`c_Vm6hk/`"49}Yaesu VX-8G_#
N1ZZN-9>T2SP0W:`c_Vm6hk/`"49}Yaesu FT1D_$
N1ZZN-9>T2SP0W:`c_Vm6hk/`"49}Yaesu FTM-400DR_%
N1ZZN-9>T2SP0W:'c_Vm6hk/`"49}Byonics TinyTrack3|3
N1ZZN-9>T2SP0W:'c_Vm6hk/`"49}Byonics TinyTrack4|4
# The next group starts with metacharacter "T" which can be any of space > ] ` '
# But space is for original Mic-E, # > and ] are for Kenwood,
# so ` ' would probably be less ambigous choices but any appear to be valid.
N1ZZN-9>T2SP0W:'c_Vm6hk/`"49}Hamhud\9
N1ZZN-9>T2SP0W:'c_Vm6hk/`"49}Argent/9
N1ZZN-9>T2SP0W:'c_Vm6hk/`"49}HinzTec anyfrog^9
N1ZZN-9>T2SP0W:'c_Vm6hk/`"49}APOZxx www.KissOZ.dk Tracker. OZ1EKD and OZ7HVO*9
N1ZZN-9>T2SP0W:'c_Vm6hk/`"49}OTHER~9
# TODO: Why is manufacturer unknown? Should we explicitly say unknown?
[0] VE2VL-9>TU3V0P,VE2PCQ-3,WIDE1,W1UWS-1,UNCAN,WIDE2*:`eB?l")v/"3y}
MIC-E, VAN, En Route
[0] VE2VL-9>TU3U5Q,VE2PCQ-3,WIDE1,W1UWS-1,N1NCI-3,WIDE2*:`eBgl"$v/"42}73 de Julien, Tinytrak 3
MIC-E, VAN, En Route
[0] W1ERB-9>T1SW8P,KB1AEV-15,N1NCI-3,WIDE2*:`dI8l!#j/"3m}
MIC-E, JEEP, In Service
[0] W1ERB-9>T1SW8Q,KB1AEV-15,N1NCI-3,WIDE2*:`dI6l{^j/"4+}IntheJeep..try146.79(PVRA)
"146.79" in comment looks like a frequency in non-standard format.
For most systems to recognize it, use exactly this form "146.790MHz" at beginning of comment.
MIC-E, JEEP, In Service
*/
static int mic_e_digit (decode_aprs_t *A, char c, int mask, int *std_msg, int *cust_msg)
{
if (c >= '0' && c <= '9') {
return (c - '0');
}
if (c >= 'A' && c <= 'J') {
*cust_msg |= mask;
return (c - 'A');
}
if (c >= 'P' && c <= 'Y') {
*std_msg |= mask;
return (c - 'P');
}
/* K, L, Z should be converted to space. */
/* others are invalid. */
/* But caller expects only values 0 - 9. */
if (c == 'K') {
*cust_msg |= mask;
return (0);
}
if (c == 'L') {
return (0);
}
if (c == 'Z') {
*std_msg |= mask;
return (0);
}
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character \"%c\" in MIC-E destination/latitude.\n", c);
}
return (0);
}
static void aprs_mic_e (decode_aprs_t *A, packet_t pp, unsigned char *info, int ilen)
{
struct aprs_mic_e_s {
char dti; /* ' or ` */
unsigned char lon[3]; /* "d+28", "m+28", "h+28" */
unsigned char speed_course[3];
char symbol_code;
char sym_table_id;
} *p;
char dest[10];
int ch;
int n;
int offset;
int std_msg = 0;
int cust_msg = 0;
const char *std_text[8] = {"Emergency", "Priority", "Special", "Committed", "Returning", "In Service", "En Route", "Off Duty" };
const char *cust_text[8] = {"Emergency", "Custom-6", "Custom-5", "Custom-4", "Custom-3", "Custom-2", "Custom-1", "Custom-0" };
unsigned char *pfirst, *plast;
strlcpy (A->g_msg_type, "MIC-E", sizeof(A->g_msg_type));
p = (struct aprs_mic_e_s *)info;
/* Destination is really latitude of form ddmmhh. */
/* Message codes are buried in the first 3 digits. */
ax25_get_addr_with_ssid (pp, AX25_DESTINATION, dest);
A->g_lat = mic_e_digit(A, dest[0], 4, &std_msg, &cust_msg) * 10 +
mic_e_digit(A, dest[1], 2, &std_msg, &cust_msg) +
(mic_e_digit(A, dest[2], 1, &std_msg, &cust_msg) * 1000 +
mic_e_digit(A, dest[3], 0, &std_msg, &cust_msg) * 100 +
mic_e_digit(A, dest[4], 0, &std_msg, &cust_msg) * 10 +
mic_e_digit(A, dest[5], 0, &std_msg, &cust_msg)) / 6000.0;
/* 4th character of desination indicates north / south. */
if ((dest[3] >= '0' && dest[3] <= '9') || dest[3] == 'L') {
/* South */
A->g_lat = ( - A->g_lat);
}
else if (dest[3] >= 'P' && dest[3] <= 'Z')
{
/* North */
}
else
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid MIC-E N/S encoding in 4th character of destination.\n");
}
}
/* Longitude is mostly packed into 3 bytes of message but */
/* has a couple bits of information in the destination. */
if ((dest[4] >= '0' && dest[4] <= '9') || dest[4] == 'L')
{
offset = 0;
}
else if (dest[4] >= 'P' && dest[4] <= 'Z')
{
offset = 1;
}
else
{
offset = 0;
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid MIC-E Longitude Offset in 5th character of destination.\n");
}
}
/* First character of information field is longitude in degrees. */
/* It is possible for the unprintable DEL character to occur here. */
/* 5th character of desination indicates longitude offset of +100. */
/* Not quite that simple :-( */
ch = p->lon[0];
if (offset && ch >= 118 && ch <= 127)
{
A->g_lon = ch - 118; /* 0 - 9 degrees */
}
else if ( ! offset && ch >= 38 && ch <= 127)
{
A->g_lon = (ch - 38) + 10; /* 10 - 99 degrees */
}
else if (offset && ch >= 108 && ch <= 117)
{
A->g_lon = (ch - 108) + 100; /* 100 - 109 degrees */
}
else if (offset && ch >= 38 && ch <= 107)
{
A->g_lon = (ch - 38) + 110; /* 110 - 179 degrees */
}
else
{
A->g_lon = G_UNKNOWN;
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character 0x%02x for MIC-E Longitude Degrees.\n", ch);
}
}
/* Second character of information field is A->g_longitude minutes. */
/* These are all printable characters. */
/*
* More than once I've see the TH-D72A put <0x1a> here and flip between north and south.
*
* WB2OSZ>TRSW1R,WIDE1-1,WIDE2-2:`c0ol!O[/>=<0x0d>
* N 42 37.1200, W 071 20.8300, 0 MPH, course 151
*
* WB2OSZ>TRS7QR,WIDE1-1,WIDE2-2:`v<0x1a>n<0x1c>"P[/>=<0x0d>
* Invalid character 0x1a for MIC-E Longitude Minutes.
* S 42 37.1200, Invalid Longitude, 0 MPH, course 252
*
* This was direct over the air with no opportunity for a digipeater
* or anything else to corrupt the message.
*/
if (A->g_lon != G_UNKNOWN)
{
ch = p->lon[1];
if (ch >= 88 && ch <= 97)
{
A->g_lon += (ch - 88) / 60.0; /* 0 - 9 minutes*/
}
else if (ch >= 38 && ch <= 87)
{
A->g_lon += ((ch - 38) + 10) / 60.0; /* 10 - 59 minutes */
}
else {
A->g_lon = G_UNKNOWN;
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character 0x%02x for MIC-E Longitude Minutes.\n", ch);
}
}
/* Third character of information field is longitude hundredths of minutes. */
/* There are 100 possible values, from 0 to 99. */
/* Note that the range includes 4 unprintable control characters and DEL. */
if (A->g_lon != G_UNKNOWN)
{
ch = p->lon[2];
if (ch >= 28 && ch <= 127)
{
A->g_lon += ((ch - 28) + 0) / 6000.0; /* 0 - 99 hundredths of minutes*/
}
else {
A->g_lon = G_UNKNOWN;
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character 0x%02x for MIC-E Longitude hundredths of Minutes.\n", ch);
}
}
}
}
/* 6th character of destintation indicates east / west. */
/*
* Example of apparently invalid encoding. 6th character missing.
*
* [0] KB1HOZ-9>TTRW5,KQ1L-2,WIDE1,KQ1L-8,UNCAN,WIDE2*:`aFo"]|k/]"4m}<0x0d>
* Invalid character "Invalid MIC-E E/W encoding in 6th character of destination.
* MIC-E, truck, Kenwood TM-D700, Off Duty
* N 44 27.5000, E 069 42.8300, 76 MPH, course 196, alt 282 ft
*/
if ((dest[5] >= '0' && dest[5] <= '9') || dest[5] == 'L') {
/* East */
}
else if (dest[5] >= 'P' && dest[5] <= 'Z')
{
/* West */
if (A->g_lon != G_UNKNOWN) {
A->g_lon = ( - A->g_lon);
}
}
else
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid MIC-E E/W encoding in 6th character of destination.\n");
}
}
/* Symbol table and codes like everyone else. */
A->g_symbol_table = p->sym_table_id;
A->g_symbol_code = p->symbol_code;
if (A->g_symbol_table != '/' && A->g_symbol_table != '\\'
&& ! isupper(A->g_symbol_table) && ! isdigit(A->g_symbol_table))
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid symbol table code not one of / \\ A-Z 0-9\n");
}
A->g_symbol_table = '/';
}
/* Message type from two 3-bit codes. */
if (std_msg == 0 && cust_msg == 0) {
strlcpy (A->g_mic_e_status, "Emergency", sizeof(A->g_mic_e_status));
}
else if (std_msg == 0 && cust_msg != 0) {
strlcpy (A->g_mic_e_status, cust_text[cust_msg], sizeof(A->g_mic_e_status));
}
else if (std_msg != 0 && cust_msg == 0) {
strlcpy (A->g_mic_e_status, std_text[std_msg], sizeof(A->g_mic_e_status));
}
else {
strlcpy (A->g_mic_e_status, "Unknown MIC-E Message Type", sizeof(A->g_mic_e_status));
}
/* Speed and course from next 3 bytes. */
n = ((p->speed_course[0] - 28) * 10) + ((p->speed_course[1] - 28) / 10);
if (n >= 800) n -= 800;
A->g_speed_mph = DW_KNOTS_TO_MPH(n);
n = ((p->speed_course[1] - 28) % 10) * 100 + (p->speed_course[2] - 28);
if (n >= 400) n -= 400;
/* Result is 0 for unknown and 1 - 360 where 360 is north. */
/* Convert to 0 - 360 and reserved value for unknown. */
if (n == 0)
A->g_course = G_UNKNOWN;
else if (n == 360)
A->g_course = 0;
else
A->g_course = n;
/* Now try to pick out manufacturer and other optional items. */
/* The telemetry field, in the original spec, is no longer used. */
strlcpy (A->g_mfr, "Unknown manufacturer", sizeof(A->g_mfr));
pfirst = info + sizeof(struct aprs_mic_e_s);
plast = info + ilen - 1;
/* Carriage return character at the end is not mentioned in spec. */
/* Remove if found because it messes up extraction of manufacturer. */
/* Don't drop trailing space because that is used for Yaesu VX-8. */
/* As I recall, the IGate function trims trailing spaces. */
/* That would be bad for this particular model. Maybe I'm mistaken? */
if (*plast == '\r') plast--;
#define isT(c) ((c) == ' ' || (c) == '>' || (c) == ']' || (c) == '`' || (c) == '\'')
// Last updated Sept. 2016 for TH-D74A
if (isT(*pfirst)) {
if (*pfirst == ' ' ) { strlcpy (A->g_mfr, "Original MIC-E", sizeof(A->g_mfr)); pfirst++; }
else if (*pfirst == '>' && *plast == '=') { strlcpy (A->g_mfr, "Kenwood TH-D72", sizeof(A->g_mfr)); pfirst++; plast--; }
else if (*pfirst == '>' && *plast == '^') { strlcpy (A->g_mfr, "Kenwood TH-D74", sizeof(A->g_mfr)); pfirst++; plast--; }
else if (*pfirst == '>' ) { strlcpy (A->g_mfr, "Kenwood TH-D7A", sizeof(A->g_mfr)); pfirst++; }
else if (*pfirst == ']' && *plast == '=') { strlcpy (A->g_mfr, "Kenwood TM-D710", sizeof(A->g_mfr)); pfirst++; plast--; }
else if (*pfirst == ']' ) { strlcpy (A->g_mfr, "Kenwood TM-D700", sizeof(A->g_mfr)); pfirst++; }
else if (*pfirst == '`' && *(plast-1) == '_' && *plast == ' ') { strlcpy (A->g_mfr, "Yaesu VX-8", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' && *(plast-1) == '_' && *plast == '"') { strlcpy (A->g_mfr, "Yaesu FTM-350", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' && *(plast-1) == '_' && *plast == '#') { strlcpy (A->g_mfr, "Yaesu VX-8G", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' && *(plast-1) == '_' && *plast == '$') { strlcpy (A->g_mfr, "Yaesu FT1D", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' && *(plast-1) == '_' && *plast == '%') { strlcpy (A->g_mfr, "Yaesu FTM-400DR", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' && *(plast-1) == '_' && *plast == ')') { strlcpy (A->g_mfr, "Yaesu FTM-100D", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' && *(plast-1) == '_' && *plast == '(') { strlcpy (A->g_mfr, "Yaesu FT2D", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' && *(plast-1) == ' ' && *plast == 'X') { strlcpy (A->g_mfr, "AP510", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '`' ) { strlcpy (A->g_mfr, "Mic-Emsg", sizeof(A->g_mfr)); pfirst++; }
else if (*pfirst == '\'' && *(plast-1) == '|' && *plast == '3') { strlcpy (A->g_mfr, "Byonics TinyTrack3", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '\'' && *(plast-1) == '|' && *plast == '4') { strlcpy (A->g_mfr, "Byonics TinyTrack4", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '\'' && *(plast-1) == ':' && *plast == '4') { strlcpy (A->g_mfr, "SCS GmbH & Co. P4dragon DR-7400 modems", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '\'' && *(plast-1) == ':' && *plast == '8') { strlcpy (A->g_mfr, "SCS GmbH & Co. P4dragon DR-7800 modems", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if (*pfirst == '\'' ) { strlcpy (A->g_mfr, "McTrackr", sizeof(A->g_mfr)); pfirst++; }
else if ( *(plast-1) == '\\' ) { strlcpy (A->g_mfr, "Hamhud ?", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if ( *(plast-1) == '/' ) { strlcpy (A->g_mfr, "Argent ?", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if ( *(plast-1) == '^' ) { strlcpy (A->g_mfr, "HinzTec anyfrog", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if ( *(plast-1) == '*' ) { strlcpy (A->g_mfr, "APOZxx www.KissOZ.dk Tracker. OZ1EKD and OZ7HVO", sizeof(A->g_mfr)); pfirst++; plast-=2; }
else if ( *(plast-1) == '~' ) { strlcpy (A->g_mfr, "OTHER", sizeof(A->g_mfr)); pfirst++; plast-=2; }
}
/*
* An optional altitude is next.
* It is three base-91 digits followed by "}".
* The TM-D710A might have encoding bug. This was observed:
*
* KJ4ETP-9>SUUP9Q,KE4OTZ-3,WIDE1*,WIDE2-1,qAR,KI4HDU-2:`oV$n6:>/]"7&}162.475MHz <Knox,TN> clintserman@gmail=
* N 35 50.9100, W 083 58.0800, 25 MPH, course 230, alt 945 ft, 162.475MHz
*
* KJ4ETP-9>SUUP6Y,GRNTOP-3*,WIDE2-1,qAR,KI4HDU-2:`oU~nT >/]<0x9a>xt}162.475MHz <Knox,TN> clintserman@gmail=
* Invalid character in MIC-E altitude. Must be in range of '!' to '{'.
* N 35 50.6900, W 083 57.9800, 29 MPH, course 204, alt 3280843 ft, 162.475MHz
*
* KJ4ETP-9>SUUP6Y,N4NEQ-3,K4EGA-1,WIDE2*,qAS,N5CWH-1:`oU~nT >/]?xt}162.475MHz <Knox,TN> clintserman@gmail=
* N 35 50.6900, W 083 57.9800, 29 MPH, course 204, alt 808497 ft, 162.475MHz
*
* KJ4ETP-9>SUUP2W,KE4OTZ-3,WIDE1*,WIDE2-1,qAR,KI4HDU-2:`oV2o"J>/]"7)}162.475MHz <Knox,TN> clintserman@gmail=
* N 35 50.2700, W 083 58.2200, 35 MPH, course 246, alt 955 ft, 162.475MHz
*
* Note the <0x9a> which is outside of the 7-bit ASCII range. Clearly very wrong.
*/
if (plast > pfirst && pfirst[3] == '}') {
A->g_altitude_ft = DW_METERS_TO_FEET((pfirst[0]-33)*91*91 + (pfirst[1]-33)*91 + (pfirst[2]-33) - 10000);
if ( ! isdigit91(pfirst[0]) || ! isdigit91(pfirst[1]) || ! isdigit91(pfirst[2]))
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in MIC-E altitude. Must be in range of '!' to '{'.\n");
dw_printf("Bogus altitude of %.0f changed to unknown.\n", A->g_altitude_ft);
}
A->g_altitude_ft = G_UNKNOWN;
}
pfirst += 4;
}
process_comment (A, (char*)pfirst, (int)(plast - pfirst) + 1);
}
/*------------------------------------------------------------------
*
* Function: aprs_message
*
* Purpose: Decode "Message Format."
* The word message is used loosely all over the place, but it has a very specific meaning here.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
* quiet - supress error messages.
*
* Outputs: A->g_msg_type Text description for screen display.
*
* A->g_addressee To whom is it addressed.
* Could be a specific station, alias, bulletin, etc.
* For telemetry metadata is is about this station,
* not being sent to it.
*
* A->g_message_subtype Subtype so caller might avoid replicating
* all the code to distinguish them.
*
* A->g_message_number Message number if any. Required for ack/rej.
*
* Description: An APRS message is a text string with a specifed addressee.
*
* It's a lot more complicated with different types of addressees
* and replies with acknowledgement or rejection.
*
* There is even a special case for telemetry metadata.
*
*
* Cases: :xxxxxxxxx:PARM. Telemetry metadata, parameter name
* :xxxxxxxxx:UNIT. Telemetry metadata, unit/label
* :xxxxxxxxx:EQNS. Telemetry metadata, Equation Coefficents
* :xxxxxxxxx:BITS. Telemetry metadata, Bit Sense/Project Name
* :xxxxxxxxx:? Directed Station Query
* :xxxxxxxxx:ack Message acknowledged (received)
* :xxxxxxxxx:rej Message rejected (unable to accept)
*
* :xxxxxxxxx: ... Message with no message number.
* (Text may not contain the { character because
* it indicates beginning of optional message number.)
* :xxxxxxxxx: ... {num Message with message number.
*
*------------------------------------------------------------------*/
static void aprs_message (decode_aprs_t *A, unsigned char *info, int ilen, int quiet)
{
struct aprs_message_s {
char dti; /* : */
char addressee[9];
char colon; /* : */
char message[73]; /* 0-67 characters for message */
/* Optional { followed by 1-5 characters for message number */
/* If the first chracter is '?' it is a Directed Station Query. */
} *p;
char addressee[AX25_MAX_ADDR_LEN];
int i;
p = (struct aprs_message_s *)info;
strlcpy (A->g_msg_type, "APRS Message", sizeof(A->g_msg_type));
A->g_message_subtype = message_subtype_message; /* until found otherwise */
if (ilen < 11) {
if (! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("APRS Message must have a minimum of 11 characters for : 9 character addressee :\n");
}
A->g_message_subtype = message_subtype_invalid;
return;
}
if (p->colon != ':') {
if (! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("APRS Message must begin with : 9 character addressee :\n");
}
A->g_message_subtype = message_subtype_invalid;
return;
}
memset (addressee, 0, sizeof(addressee));
memcpy (addressee, p->addressee, sizeof(p->addressee)); // copy exactly 9 bytes.
/* Trim trailing spaces. */
i = strlen(addressee) - 1;
while (i >= 0 && addressee[i] == ' ') {
addressee[i--] = '\0';
}
strlcpy (A->g_addressee, addressee, sizeof(A->g_addressee));
/*
* Special message formats contain telemetry metadata.
* It applies to the addressee, not the sender.
* Makes no sense to me that it would not apply to sender instead.
* Wouldn't the sender be describing his own data?
*
* I also don't understand the reasoning for putting this in a "message."
* Telemetry data always starts with "#" after the "T" data type indicator.
* Why not use other characters after the "T" for metadata?
*/
if (strncmp(p->message,"PARM.",5) == 0) {
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "Telemetry Parameter Name Message for \"%s\"", addressee);
A->g_message_subtype = message_subtype_telem_parm;
telemetry_name_message (addressee, p->message+5);
}
else if (strncmp(p->message,"UNIT.",5) == 0) {
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "Telemetry Unit/Label Message for \"%s\"", addressee);
A->g_message_subtype = message_subtype_telem_unit;
telemetry_unit_label_message (addressee, p->message+5);
}
else if (strncmp(p->message,"EQNS.",5) == 0) {
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "Telemetry Equation Coefficents Message for \"%s\"", addressee);
A->g_message_subtype = message_subtype_telem_eqns;
telemetry_coefficents_message (addressee, p->message+5, quiet);
}
else if (strncmp(p->message,"BITS.",5) == 0) {
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "Telemetry Bit Sense/Project Name Message for \"%s\"", addressee);
A->g_message_subtype = message_subtype_telem_bits;
telemetry_bit_sense_message (addressee, p->message+5, quiet);
}
/*
* If first character of message is "?" it is a query directed toward a specific station.
*/
else if (p->message[0] == '?') {
strlcpy (A->g_msg_type, "Directed Station Query", sizeof(A->g_msg_type));
A->g_message_subtype = message_subtype_directed_query;
aprs_directed_station_query (A, addressee, p->message+1, quiet);
}
/* ack or rej? Message number is required for these. */
else if (strncmp(p->message,"ack",3) == 0) {
strlcpy (A->g_message_number, p->message + 3, sizeof(A->g_message_number));
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "ACK message %s for \"%s\"", A->g_message_number, addressee);
A->g_message_subtype = message_subtype_ack;
}
else if (strncmp(p->message,"rej",3) == 0) {
strlcpy (A->g_message_number, p->message + 3, sizeof(A->g_message_number));
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "REJ message %s for \"%s\"", A->g_message_number, addressee);
A->g_message_subtype = message_subtype_ack;
}
/* message number is optional here. */
else {
char *pno = strchr(p->message, '{');
if (pno != NULL) {
strlcpy (A->g_message_number, pno+1, sizeof(A->g_message_number));
}
snprintf (A->g_msg_type, sizeof(A->g_msg_type), "APRS Message %s for \"%s\"", A->g_message_number, addressee);
A->g_message_subtype = message_subtype_message;
/* No location so don't use process_comment () */
strlcpy (A->g_comment, p->message, sizeof(A->g_comment));
}
}
/*------------------------------------------------------------------
*
* Function: aprs_object
*
* Purpose: Decode "Object Report Format"
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A->g_object_name, A->g_lat, A->g_lon, A->g_symbol_table, A->g_symbol_code, A->g_speed_mph, A->g_course, A->g_altitude_ft.
*
* Description: Message has a 9 character object name which could be quite different than
* the source station.
*
* This can also be a weather report when the symbol id is '_'.
*
* Examples: ;WA2PNU *050457z4051.72N/07325.53W]BBS & FlexNet 145.070 MHz
*
* ;ActonEOC *070352z4229.20N/07125.95WoFire, EMS, Police, Heli-pad, Dial 911
*
* ;IRLPC494@*012112zI9*n*<ONV0 446325-146IDLE<CR>
*
*------------------------------------------------------------------*/
static void aprs_object (decode_aprs_t *A, unsigned char *info, int ilen)
{
struct aprs_object_s {
char dti; /* ; */
char name[9];
char live_killed; /* * for live or _ for killed */
char time_stamp[7];
position_t pos;
char comment[43]; /* First 7 bytes could be data extension. */
} *p;
struct aprs_compressed_object_s {
char dti; /* ; */
char name[9];
char live_killed; /* * for live or _ for killed */
char time_stamp[7];
compressed_position_t cpos;
char comment[40]; /* No data extension in this case. */
} *q;
time_t ts = 0;
int i;
p = (struct aprs_object_s *)info;
q = (struct aprs_compressed_object_s *)info;
//assert (sizeof(A->g_name) > sizeof(p->name));
memset (A->g_name, 0, sizeof(A->g_name));
memcpy (A->g_name, p->name, sizeof(p->name)); // copy exactly 9 bytes.
/* Trim trailing spaces. */
i = strlen(A->g_name) - 1;
while (i >= 0 && A->g_name[i] == ' ') {
A->g_name[i--] = '\0';
}
if (p->live_killed == '*')
strlcpy (A->g_msg_type, "Object", sizeof(A->g_msg_type));
else if (p->live_killed == '_')
strlcpy (A->g_msg_type, "Killed Object", sizeof(A->g_msg_type));
else
strlcpy (A->g_msg_type, "Object - invalid live/killed", sizeof(A->g_msg_type));
ts = get_timestamp (A, p->time_stamp);
if (isdigit((unsigned char)(p->pos.lat[0]))) /* Human-readable location. */
{
decode_position (A, &(p->pos));
if (A->g_symbol_code == '_') {
/* Symbol code indidates it is a weather report. */
/* In this case, we expect 7 byte "data extension" */
/* for the wind direction and speed. */
strlcpy (A->g_msg_type, "Weather Report with Object", sizeof(A->g_msg_type));
weather_data (A, p->comment, TRUE);
}
else {
/* Regular object. */
data_extension_comment (A, p->comment);
}
}
else /* Compressed location. */
{
decode_compressed_position (A, &(q->cpos));
if (A->g_symbol_code == '_') {
/* Symbol code indidates it is a weather report. */
/* The spec doesn't explicitly mention the combination */
/* of weather report and object with compressed */
/* position. */
strlcpy (A->g_msg_type, "Weather Report with Object", sizeof(A->g_msg_type));
weather_data (A, q->comment, FALSE);
}
else {
/* Regular position report. */
process_comment (A, q->comment, -1);
}
}
(void)(ts);
} /* end aprs_object */
/*------------------------------------------------------------------
*
* Function: aprs_item
*
* Purpose: Decode "Item Report Format"
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A->g_object_name, A->g_lat, A->g_lon, A->g_symbol_table, A->g_symbol_code, A->g_speed_mph, A->g_course, A->g_altitude_ft.
*
* Description: An "item" is very much like an "object" except
*
* -- It doesn't have a time.
* -- Name is a VARIABLE length 3 to 9 instead of fixed 9.
* -- "live" indicator is ! rather than *
*
* Examples:
*
*------------------------------------------------------------------*/
static void aprs_item (decode_aprs_t *A, unsigned char *info, int ilen)
{
struct aprs_item_s {
char dti; /* ')' */
char name[10]; /* Actually variable length 3 - 9 bytes. */
/* DON'T refer to the rest of this structure; */
/* the offsets will be wrong! */
/* We make it 10 here so we don't get subscript out of bounds */
/* warning when looking for following '!' or '_' character. */
char live_killed__; /* ! for live or _ for killed */
position_t pos__;
char comment__[43]; /* First 7 bytes could be data extension. */
} *p;
struct aprs_compressed_item_s {
char dti; /* ')' */
char name[10]; /* Actually variable length 3 - 9 bytes. */
/* DON'T refer to the rest of this structure; */
/* the offsets will be wrong! */
char live_killed__; /* ! for live or _ for killed */
compressed_position_t cpos__;
char comment__[40]; /* No data extension in this case. */
} *q;
int i;
char *ppos;
p = (struct aprs_item_s *)info;
q = (struct aprs_compressed_item_s *)info;
(void)(q);
memset (A->g_name, 0, sizeof(A->g_name));
i = 0;
while (i < 9 && p->name[i] != '!' && p->name[i] != '_') {
A->g_name[i] = p->name[i];
i++;
A->g_name[i] = '\0';
}
if (p->name[i] == '!')
strlcpy (A->g_msg_type, "Item", sizeof(A->g_msg_type));
else if (p->name[i] == '_')
strlcpy (A->g_msg_type, "Killed Item", sizeof(A->g_msg_type));
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Item name too long or not followed by ! or _.\n");
}
strlcpy (A->g_msg_type, "Object - invalid live/killed", sizeof(A->g_msg_type));
}
ppos = p->name + i + 1;
if (isdigit(*ppos)) /* Human-readable location. */
{
decode_position (A, (position_t*) ppos);
data_extension_comment (A, ppos + sizeof(position_t));
}
else /* Compressed location. */
{
decode_compressed_position (A, (compressed_position_t*)ppos);
process_comment (A, ppos + sizeof(compressed_position_t), -1);
}
}
/*------------------------------------------------------------------
*
* Function: aprs_station_capabilities
*
* Purpose: Decode "Station Capabilities"
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: ???
*
* Description: Each capability is a TOKEN or TOKEN=VALUE pair.
*
*
* Example: <IGATE,MSG_CNT=3,LOC_CNT=49<CR>
*
* Bugs: Not implemented yet. Treat whole thing as comment.
*
*------------------------------------------------------------------*/
static void aprs_station_capabilities (decode_aprs_t *A, char *info, int ilen)
{
strlcpy (A->g_msg_type, "Station Capabilities", sizeof(A->g_msg_type));
// process_comment() not applicable here because it
// extracts information found in certain formats.
strlcpy (A->g_comment, info+1, sizeof(A->g_comment));
} /* end aprs_station_capabilities */
/*------------------------------------------------------------------
*
* Function: aprs_status_report
*
* Purpose: Decode "Status Report"
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: ???
*
* Description: There are 3 different formats:
*
* (1) '>'
* 7 char - timestamp, DHM z format
* 0-55 char - status text
*
* (3) '>'
* 4 or 6 char - Maidenhead Locator
* 2 char - symbol table & code
* ' ' character
* 0-53 char - status text
*
* (2) '>'
* 0-62 char - status text
*
*
* In all cases, Beam heading and ERP can be at the
* very end by using '^' and two other characters.
*
*
* Examples from specification:
*
*
* >Net Control Center without timestamp.
* >092345zNet Control Center with timestamp.
* >IO91SX/G
* >IO91/G
* >IO91SX/- My house (Note the space at the start of the status text).
* >IO91SX/- ^B7 Meteor Scatter beam heading = 110 degrees, ERP = 490 watts.
*
*------------------------------------------------------------------*/
static void aprs_status_report (decode_aprs_t *A, char *info, int ilen)
{
struct aprs_status_time_s {
char dti; /* > */
char ztime[7]; /* Time stamp ddhhmmz */
char comment[55];
} *pt;
struct aprs_status_m4_s {
char dti; /* > */
char mhead4[4]; /* 4 character Maidenhead locator. */
char sym_table_id;
char symbol_code;
char space; /* Should be space after symbol code. */
char comment[54];
} *pm4;
struct aprs_status_m6_s {
char dti; /* > */
char mhead6[6]; /* 6 character Maidenhead locator. */
char sym_table_id;
char symbol_code;
char space; /* Should be space after symbol code. */
char comment[54];
} *pm6;
struct aprs_status_s {
char dti; /* > */
char comment[62];
} *ps;
strlcpy (A->g_msg_type, "Status Report", sizeof(A->g_msg_type));
pt = (struct aprs_status_time_s *)info;
pm4 = (struct aprs_status_m4_s *)info;
pm6 = (struct aprs_status_m6_s *)info;
ps = (struct aprs_status_s *)info;
/*
* Do we have format with time?
*/
if (isdigit(pt->ztime[0]) &&
isdigit(pt->ztime[1]) &&
isdigit(pt->ztime[2]) &&
isdigit(pt->ztime[3]) &&
isdigit(pt->ztime[4]) &&
isdigit(pt->ztime[5]) &&
pt->ztime[6] == 'z') {
// process_comment() not applicable here because it
// extracts information found in certain formats.
strlcpy (A->g_comment, pt->comment, sizeof(A->g_comment));
}
/*
* Do we have format with 6 character Maidenhead locator?
*/
else if (get_maidenhead (A, pm6->mhead6) == 6) {
memset (A->g_maidenhead, 0, sizeof(A->g_maidenhead));
memcpy (A->g_maidenhead, pm6->mhead6, sizeof(pm6->mhead6));
A->g_symbol_table = pm6->sym_table_id;
A->g_symbol_code = pm6->symbol_code;
if (A->g_symbol_table != '/' && A->g_symbol_table != '\\'
&& ! isupper(A->g_symbol_table) && ! isdigit(A->g_symbol_table))
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid symbol table code '%c' not one of / \\ A-Z 0-9\n", A->g_symbol_table);
}
A->g_symbol_table = '/';
}
if (pm6->space != ' ' && pm6->space != '\0') {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Error: Found '%c' instead of space required after symbol code.\n", pm6->space);
}
}
// process_comment() not applicable here because it
// extracts information found in certain formats.
strlcpy (A->g_comment, pm6->comment, sizeof(A->g_comment));
}
/*
* Do we have format with 4 character Maidenhead locator?
*/
else if (get_maidenhead (A, pm4->mhead4) == 4) {
memset (A->g_maidenhead, 0, sizeof(A->g_maidenhead));
memcpy (A->g_maidenhead, pm4->mhead4, sizeof(pm4->mhead4));
A->g_symbol_table = pm4->sym_table_id;
A->g_symbol_code = pm4->symbol_code;
if (A->g_symbol_table != '/' && A->g_symbol_table != '\\'
&& ! isupper(A->g_symbol_table) && ! isdigit(A->g_symbol_table))
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid symbol table code '%c' not one of / \\ A-Z 0-9\n", A->g_symbol_table);
}
A->g_symbol_table = '/';
}
if (pm4->space != ' ' && pm4->space != '\0') {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Error: Found '%c' instead of space required after symbol code.\n", pm4->space);
}
}
// process_comment() not applicable here because it
// extracts information found in certain formats.
strlcpy (A->g_comment, pm4->comment, sizeof(A->g_comment));
}
/*
* Whole thing is status text.
*/
else {
strlcpy (A->g_comment, ps->comment, sizeof(A->g_comment));
}
/*
* Last 3 characters can represent beam heading and ERP.
*/
if (strlen(A->g_comment) >= 3) {
char *hp = A->g_comment + strlen(A->g_comment) - 3;
if (*hp == '^') {
char h = hp[1];
char p = hp[2];
int beam = -1;
int erp = -1;
if (h >= '0' && h <= '9') {
beam = (h - '0') * 10;
}
else if (h >= 'A' && h <= 'Z') {
beam = (h - 'A') * 10 + 100;
}
if (p >= '1' && p <= 'K') {
erp = (p - '0') * (p - '0') * 10;
}
// TODO (low): put result somewhere.
// could use A->g_directivity and need new variable for erp.
*hp = '\0';
(void)(beam);
(void)(erp);
}
}
} /* end aprs_status_report */
/*------------------------------------------------------------------
*
* Function: aprs_general_query
*
* Purpose: Decode "General Query" for all stations.
*
* Inputs: info - Pointer to Information field. First character should be "?".
* ilen - Information field length.
* quiet - suppress error messages.
*
* Outputs: A - Decoded packet structure
* A->g_query_type
* A->g_query_lat (optional)
* A->g_query_lon (optional)
* A->g_query_radius (optional)
*
* Description: Formats are:
*
* ?query?
* ?query?lat,long,radius
*
* 'query' is one of APRS, IGATE, WX, ...
* optional footprint, in degrees and miles radius, means only
* those in the specified circle should respond.
*
* Examples from specification, Chapter 15:
*
* ?APRS?
* ?APRS? 34.02,-117.15,0200
* ?IGATE?
*
*------------------------------------------------------------------*/
static void aprs_general_query (decode_aprs_t *A, char *info, int ilen, int quiet)
{
char *q2;
char *p;
char *tok;
char stemp[256];
double lat, lon;
float radius;
strlcpy (A->g_msg_type, "General Query", sizeof(A->g_msg_type));
/*
* First make a copy because we will modify it while parsing it.
*/
strlcpy (stemp, info, sizeof(stemp));
/*
* There should be another "?" after the query type.
*/
q2 = strchr(stemp+1, '?');
if (q2 == NULL) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("General Query must have ? after the query type.\n");
}
return;
}
*q2 = '\0';
strlcpy (A->g_query_type, stemp+1, sizeof(A->g_query_type));
// TODO: remove debug
text_color_set(DW_COLOR_DEBUG);
dw_printf("DEBUG: General Query type = \"%s\"\n", A->g_query_type);
p = q2 + 1;
if (strlen(p) == 0) {
return;
}
/*
* Try to extract footprint.
* Spec says positive coordinate would be preceded by space
* and radius must be exactly 4 digits. We are more forgiving.
*/
tok = strsep(&p, ",");
if (tok != NULL) {
lat = atof(tok);
tok = strsep(&p, ",");
if (tok != NULL) {
lon = atof(tok);
tok = strsep(&p, ",");
if (tok != NULL) {
radius = atof(tok);
if (lat < -90 || lat > 90) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid latitude for General Query footprint.\n");
}
return;
}
if (lon < -180 || lon > 180) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid longitude for General Query footprint.\n");
}
return;
}
if (radius <= 0 || radius > 9999) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid radius for General Query footprint.\n");
}
return;
}
A->g_footprint_lat = lat;
A->g_footprint_lon = lon;
A->g_footprint_radius = radius;
}
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Can't get radius for General Query footprint.\n");
}
return;
}
}
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Can't get longitude for General Query footprint.\n");
}
return;
}
}
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Can't get latitude for General Query footprint.\n");
}
return;
}
// TODO: remove debug
text_color_set(DW_COLOR_DEBUG);
dw_printf("DEBUG: General Query footprint = %.6f %.6f %.2f\n", lat, lon, radius);
} /* end aprs_general_query */
/*------------------------------------------------------------------
*
* Function: aprs_directed_station_query
*
* Purpose: Decode "Directed Station Query" aimed at specific station.
* This is actually a special format of the more general "message."
*
* Inputs: addressee - To whom it is directed.
* Redundant because it is already in A->addressee.
*
* query - What's left over after ":addressee:?" in info part.
*
* quiet - suppress error messages.
*
* Outputs: A - Decoded packet structure
* A->g_query_type
* A->g_query_callsign (optional)
*
* Description: The caller has already removed the :addressee:? part so we are left
* with a query type of exactly 5 characters and optional "callsign
* of heard station."
*
* Examples from specification, Chapter 15. Our "query" argument.
*
* :KH2Z :?APRSD APRSD
* :KH2Z :?APRSHVN0QBF APRSHVN0QBF
* :KH2Z :?APRST APRST
* :KH2Z :?PING? PING?
*
* "PING?" contains "?" only to pad it out to exactly 5 characters.
*
*------------------------------------------------------------------*/
static void aprs_directed_station_query (decode_aprs_t *A, char *addressee, char *query, int quiet)
{
//char query_type[20]; /* Does the query type always need to be exactly 5 characters? */
/* If not, how would we know where the extra optional information starts? */
//char callsign[AX25_MAX_ADDR_LEN];
//if (strlen(query) < 5) ...
} /* end aprs_directed_station_query */
/*------------------------------------------------------------------
*
* Function: aprs_Telemetry
*
* Purpose: Decode "Telemetry"
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
* quiet - suppress error messages.
*
* Outputs: A->g_telemetry
* A->g_comment
*
* Description: TBD.
*
* Examples from specification:
*
*
* TBD
*
*------------------------------------------------------------------*/
static void aprs_telemetry (decode_aprs_t *A, char *info, int ilen, int quiet)
{
strlcpy (A->g_msg_type, "Telemetry", sizeof(A->g_msg_type));
telemetry_data_original (A->g_src, info, quiet, A->g_telemetry, sizeof(A->g_telemetry), A->g_comment, sizeof(A->g_comment));
} /* end aprs_telemetry */
/*------------------------------------------------------------------
*
* Function: aprs_raw_touch_tone
*
* Purpose: Decode raw touch tone datA->
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Description: Touch tone data is converted to a packet format
* so it can be conveyed to an application for processing.
*
* This is not part of the APRS standard.
*
*------------------------------------------------------------------*/
static void aprs_raw_touch_tone (decode_aprs_t *A, char *info, int ilen)
{
strlcpy (A->g_msg_type, "Raw Touch Tone Data", sizeof(A->g_msg_type));
/* Just copy the info field without the message type. */
if (*info == '{')
strlcpy (A->g_comment, info+3, sizeof(A->g_comment));
else
strlcpy (A->g_comment, info+1, sizeof(A->g_comment));
} /* end aprs_raw_touch_tone */
/*------------------------------------------------------------------
*
* Function: aprs_morse_code
*
* Purpose: Convey message in packet format to be transmitted as
* Morse Code.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Description: This is not part of the APRS standard.
*
*------------------------------------------------------------------*/
static void aprs_morse_code (decode_aprs_t *A, char *info, int ilen)
{
strlcpy (A->g_msg_type, "Morse Code Data", sizeof(A->g_msg_type));
/* Just copy the info field without the message type. */
if (*info == '{')
strlcpy (A->g_comment, info+3, sizeof(A->g_comment));
else
strlcpy (A->g_comment, info+1, sizeof(A->g_comment));
} /* end aprs_morse_code */
/*------------------------------------------------------------------
*
* Function: aprs_ll_pos_time
*
* Purpose: Decode weather report without a position.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A->g_symbol_table, A->g_symbol_code.
*
* Description: Type identifier '_' is a weather report without a position.
*
*------------------------------------------------------------------*/
static void aprs_positionless_weather_report (decode_aprs_t *A, unsigned char *info, int ilen)
{
struct aprs_positionless_weather_s {
char dti; /* _ */
char time_stamp[8]; /* MDHM format */
char comment[99];
} *p;
strlcpy (A->g_msg_type, "Positionless Weather Report", sizeof(A->g_msg_type));
//time_t ts = 0;
p = (struct aprs_positionless_weather_s *)info;
// not yet implemented for 8 character format // ts = get_timestamp (A, p->time_stamp);
weather_data (A, p->comment, FALSE);
}
/*------------------------------------------------------------------
*
* Function: weather_data
*
* Purpose: Decode weather data in position or object report.
*
* Inputs: info - Pointer to first byte after location
* and symbol code.
*
* wind_prefix - Expecting leading wind info
* for human-readable location.
* (Currently ignored. We are very
* forgiving in what is accepted.)
* TODO: call this context instead and have 3 enumerated values.
*
* Global In: A->g_course - Wind info for compressed location.
* A->g_speed_mph
*
* Outputs: A->g_weather
*
* Description: Extract weather details and format into a comment.
*
* For human-readable locations, we expect wind direction
* and speed in a format like this: 999/999.
* For compressed location, this has already been
* processed and put in A->g_course and A->g_speed_mph.
* Otherwise, for positionless weather data, the
* wind is in the form c999s999.
*
* References: APRS Weather specification comments.
* http://aprs.org/aprs11/spec-wx.txt
*
* Weather updates to the spec.
* http://aprs.org/aprs12/weather-new.txt
*
* Examples:
*
* _10090556c220s004g005t077r000p000P000h50b09900wRSW
* !4903.50N/07201.75W_220/004g005t077r000p000P000h50b09900wRSW
* !4903.50N/07201.75W_220/004g005t077r000p000P000h50b.....wRSW
* @092345z4903.50N/07201.75W_220/004g005t-07r000p000P000h50b09900wRSW
* =/5L!!<*e7_7P[g005t077r000p000P000h50b09900wRSW
* @092345z/5L!!<*e7_7P[g005t077r000p000P000h50b09900wRSW
* ;BRENDA *092345z4903.50N/07201.75W_220/004g005b0990
*
*------------------------------------------------------------------*/
static int getwdata (char **wpp, char ch, int dlen, float *val)
{
char stemp[8]; // larger than maximum dlen.
int i;
//dw_printf("debug: getwdata (wp=%p, ch=%c, dlen=%d)\n", *wpp, ch, dlen);
*val = G_UNKNOWN;
assert (dlen >= 2 && dlen <= 6);
if (**wpp != ch) {
/* Not specified element identifier. */
return (0);
}
if (strncmp((*wpp)+1, "......", dlen) == 0 || strncmp((*wpp)+1, " ", dlen) == 0) {
/* Field present, unknown value */
*wpp += 1 + dlen;
return (1);
}
/* Data field can contain digits, decimal point, leading negative. */
for (i=1; i<=dlen; i++) {
if ( ! isdigit((*wpp)[i]) && (*wpp)[i] != '.' && (*wpp)[i] != '-' ) {
return(0);
}
}
memset (stemp, 0, sizeof(stemp));
memcpy (stemp, (*wpp)+1, dlen);
*val = atof(stemp);
//dw_printf("debug: getwdata returning %f\n", *val);
*wpp += 1 + dlen;
return (1);
}
static void weather_data (decode_aprs_t *A, char *wdata, int wind_prefix)
{
int n;
float fval;
char *wp = wdata;
int keep_going;
if (wp[3] == '/')
{
if (sscanf (wp, "%3d", &n))
{
// Data Extension format.
// Fine point: Officially, should be values of 001-360.
// "000" or "..." or " " means unknown.
// In practice we see do see "000" here.
A->g_course = n;
}
if (sscanf (wp+4, "%3d", &n))
{
A->g_speed_mph = DW_KNOTS_TO_MPH(n); /* yes, in knots */
}
wp += 7;
}
else if ( A->g_speed_mph == G_UNKNOWN) {
if ( ! getwdata (&wp, 'c', 3, &A->g_course)) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Didn't find wind direction in form c999.\n");
}
}
if ( ! getwdata (&wp, 's', 3, &A->g_speed_mph)) { /* MPH here */
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Didn't find wind speed in form s999.\n");
}
}
}
// At this point, we should have the wind direction and speed
// from one of three methods.
if (A->g_speed_mph != G_UNKNOWN) {
snprintf (A->g_weather, sizeof(A->g_weather), "wind %.1f mph", A->g_speed_mph);
if (A->g_course != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", direction %.0f", A->g_course);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
/* We don't want this to show up on the location line. */
A->g_speed_mph = G_UNKNOWN;
A->g_course = G_UNKNOWN;
/*
* After the mandatory wind direction and speed (in 1 of 3 formats), the
* next two must be in fixed positions:
* - gust (peak in mph last 5 minutes)
* - temperature, degrees F, can be negative e.g. -01
*/
if (getwdata (&wp, 'g', 3, &fval)) {
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", gust %.0f", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Didn't find wind gust in form g999.\n");
}
}
if (getwdata (&wp, 't', 3, &fval)) {
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", temperature %.0f", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Didn't find temperature in form t999.\n");
}
}
/*
* Now pick out other optional fields in any order.
*/
keep_going = 1;
while (keep_going) {
if (getwdata (&wp, 'r', 3, &fval)) {
/* r = rainfall, 1/100 inch, last hour */
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", rain %.2f in last hour", fval / 100.);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 'p', 3, &fval)) {
/* p = rainfall, 1/100 inch, last 24 hours */
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", rain %.2f in last 24 hours", fval / 100.);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 'P', 3, &fval)) {
/* P = rainfall, 1/100 inch, since midnight */
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", rain %.2f since midnight", fval / 100.);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 'h', 2, &fval)) {
/* h = humidity %, 00 means 100% */
if (fval != G_UNKNOWN) {
char ctemp[30];
if (fval == 0) fval = 100;
snprintf (ctemp, sizeof(ctemp), ", humidity %.0f", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 'b', 5, &fval)) {
/* b = barometric presure (tenths millibars / tenths of hPascal) */
/* Here, display as inches of mercury. */
if (fval != G_UNKNOWN) {
char ctemp[40];
fval = DW_MBAR_TO_INHG(fval * 0.1);
snprintf (ctemp, sizeof(ctemp), ", barometer %.2f", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 'L', 3, &fval)) {
/* L = Luminosity, watts/ sq meter, 000-999 */
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", %.0f watts/m^2", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 'l', 3, &fval)) {
/* l = Luminosity, watts/ sq meter, 1000-1999 */
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", %.0f watts/m^2", fval + 1000);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 's', 3, &fval)) {
/* s = Snowfall in last 24 hours, inches */
/* Data can have decimal point so we don't have to worry about scaling. */
/* 's' is also used by wind speed but that must be in a fixed */
/* position in the message so there is no confusion. */
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", %.1f snow in 24 hours", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 's', 3, &fval)) {
/* # = Raw rain counter */
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", raw rain counter %.f", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
else if (getwdata (&wp, 'X', 3, &fval)) {
/* X = Nuclear Radiation. */
/* Encoded as two significant digits and order of magnitude */
/* like resistor color code. */
// TODO: decode this properly
if (fval != G_UNKNOWN) {
char ctemp[40];
snprintf (ctemp, sizeof(ctemp), ", nuclear Radiation %.f", fval);
strlcat (A->g_weather, ctemp, sizeof(A->g_weather));
}
}
// TODO: add new flood level, battery voltage, etc.
else {
keep_going = 0;
}
}
/*
* We should be left over with:
* - one character for software.
* - two to four characters for weather station type.
* Examples: tU2k, wRSW
*
* But few people follow the protocol spec here. Instead more often we see things like:
* sunny/WX
* / {UIV32N}
*/
strlcat (A->g_weather, ", \"", sizeof(A->g_weather));
strlcat (A->g_weather, wp, sizeof(A->g_weather));
/*
* Drop any CR / LF character at the end.
*/
n = strlen(A->g_weather);
if (n >= 1 && A->g_weather[n-1] == '\n') {
A->g_weather[n-1] = '\0';
}
n = strlen(A->g_weather);
if (n >= 1 && A->g_weather[n-1] == '\r') {
A->g_weather[n-1] = '\0';
}
strlcat (A->g_weather, "\"", sizeof(A->g_weather));
return;
} /* end weather_data */
/*------------------------------------------------------------------
*
* Function: aprs_ultimeter
*
* Purpose: Decode Peet Brothers ULTIMETER Weather Station Info.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A->g_weather
*
* Description: http://www.peetbros.com/shop/custom.aspx?recid=7
*
* There are two different data formats in use.
* One begins with $ULTW and is called "Packet Mode." Example:
*
* $ULTW009400DC00E21B8027730008890200010309001E02100000004C<CR><LF>
*
* The other begins with !! and is called "logging mode." Example:
*
* !!000000A600B50000----------------001C01D500000017<CR><LF>
*
*
* Bugs: Implementation is incomplete.
* The example shown in the APRS protocol spec has a couple "----"
* fields in the $ULTW message. This should be rewritten to handle
* each field separately to deal with missing pieces.
*
*------------------------------------------------------------------*/
static void aprs_ultimeter (decode_aprs_t *A, char *info, int ilen)
{
// Header = $ULTW
// Data Fields
short h_windpeak; // 1. Wind Speed Peak over last 5 min. (0.1 kph)
short h_wdir; // 2. Wind Direction of Wind Speed Peak (0-255)
short h_otemp; // 3. Current Outdoor Temp (0.1 deg F)
short h_totrain; // 4. Rain Long Term Total (0.01 in.)
short h_baro; // 5. Current Barometer (0.1 mbar)
short h_barodelta; // 6. Barometer Delta Value(0.1 mbar)
short h_barocorrl; // 7. Barometer Corr. Factor(LSW)
short h_barocorrm; // 8. Barometer Corr. Factor(MSW)
short h_ohumid; // 9. Current Outdoor Humidity (0.1%)
short h_date; // 10. Date (day of year)
short h_time; // 11. Time (minute of day)
short h_raintoday; // 12. Today's Rain Total (0.01 inches)*
short h_windave; // 13. 5 Minute Wind Speed Average (0.1kph)*
// Carriage Return & Line Feed
// *Some instruments may not include field 13, some may
// not include 12 or 13.
// Total size: 44, 48 or 52 characters (hex digits) +
// header, carriage return and line feed.
int n;
strlcpy (A->g_msg_type, "Ultimeter", sizeof(A->g_msg_type));
if (*info == '$')
{
n = sscanf (info+5, "%4hx%4hx%4hx%4hx%4hx%4hx%4hx%4hx%4hx%4hx%4hx%4hx%4hx",
&h_windpeak,
&h_wdir,
&h_otemp,
&h_totrain,
&h_baro,
&h_barodelta,
&h_barocorrl,
&h_barocorrm,
&h_ohumid,
&h_date,
&h_time,
&h_raintoday, // not on some models.
&h_windave); // not on some models.
if (n >= 11 && n <= 13) {
float windpeak, wdir, otemp, baro, ohumid;
windpeak = DW_KM_TO_MILES(h_windpeak * 0.1);
wdir = (h_wdir & 0xff) * 360. / 256.;
otemp = h_otemp * 0.1;
baro = DW_MBAR_TO_INHG(h_baro * 0.1);
ohumid = h_ohumid * 0.1;
snprintf (A->g_weather, sizeof(A->g_weather), "wind %.1f mph, direction %.0f, temperature %.1f, barometer %.2f, humidity %.0f",
windpeak, wdir, otemp, baro, ohumid);
}
}
// Header = !!
// Data Fields
// 1. Wind Speed (0.1 kph)
// 2. Wind Direction (0-255)
// 3. Outdoor Temp (0.1 deg F)
// 4. Rain* Long Term Total (0.01 inches)
// 5. Barometer (0.1 mbar) [ can be ---- ]
// 6. Indoor Temp (0.1 deg F) [ can be ---- ]
// 7. Outdoor Humidity (0.1%) [ can be ---- ]
// 8. Indoor Humidity (0.1%) [ can be ---- ]
// 9. Date (day of year)
// 10. Time (minute of day)
// 11. Today's Rain Total (0.01 inches)*
// 12. 1 Minute Wind Speed Average (0.1kph)*
// Carriage Return & Line Feed
//
// *Some instruments may not include field 12, some may not include 11 or 12.
// Total size: 40, 44 or 48 characters (hex digits) + header, carriage return and line feed
if (*info == '!')
{
n = sscanf (info+2, "%4hx%4hx%4hx%4hx",
&h_windpeak,
&h_wdir,
&h_otemp,
&h_totrain);
if (n == 4) {
float windpeak, wdir, otemp;
windpeak = DW_KM_TO_MILES(h_windpeak * 0.1);
wdir = (h_wdir & 0xff) * 360. / 256.;
otemp = h_otemp * 0.1;
snprintf (A->g_weather, sizeof(A->g_weather), "wind %.1f mph, direction %.0f, temperature %.1f\n",
windpeak, wdir, otemp);
}
}
} /* end aprs_ultimeter */
/*------------------------------------------------------------------
*
* Function: third_party_header
*
* Purpose: Decode packet from a third party network.
*
* Inputs: info - Pointer to Information field.
* ilen - Information field length.
*
* Outputs: A->g_comment
*
* Description:
*
*------------------------------------------------------------------*/
static void third_party_header (decode_aprs_t *A, char *info, int ilen)
{
strlcpy (A->g_msg_type, "Third Party Header", sizeof(A->g_msg_type));
/* more later? */
} /* end third_party_header */
/*------------------------------------------------------------------
*
* Function: decode_position
*
* Purpose: Decode the position & symbol information common to many message formats.
*
* Inputs: ppos - Pointer to position & symbol fields.
*
* Returns: A->g_lat
* A->g_lon
* A->g_symbol_table
* A->g_symbol_code
*
* Description: This provides resolution of about 60 feet.
* This can be improved by using !DAO! in the comment.
*
*------------------------------------------------------------------*/
static void decode_position (decode_aprs_t *A, position_t *ppos)
{
A->g_lat = get_latitude_8 (ppos->lat, A->g_quiet);
A->g_lon = get_longitude_9 (ppos->lon, A->g_quiet);
A->g_symbol_table = ppos->sym_table_id;
A->g_symbol_code = ppos->symbol_code;
}
/*------------------------------------------------------------------
*
* Function: decode_compressed_position
*
* Purpose: Decode the compressed position & symbol information common to many message formats.
*
* Inputs: ppos - Pointer to compressed position & symbol fields.
*
* Returns: A->g_lat
* A->g_lon
* A->g_symbol_table
* A->g_symbol_code
*
* One of the following:
* A->g_course & A->g_speeed
* A->g_altitude_ft
* A->g_range
*
* Description: The compressed position provides resolution of around ???
* This also includes course/speed or altitude.
*
* It contains 13 bytes of the format:
*
* symbol table /, \, or overlay A-Z, a-j is mapped into 0-9
*
* yyyy Latitude, base 91.
*
* xxxx Longitude, base 91.
*
* symbol code
*
* cs Course/Speed or altitude.
*
* t Various "type" info.
*
*------------------------------------------------------------------*/
static void decode_compressed_position (decode_aprs_t *A, compressed_position_t *pcpos)
{
if (isdigit91(pcpos->y[0]) && isdigit91(pcpos->y[1]) && isdigit91(pcpos->y[2]) && isdigit91(pcpos->y[3]))
{
A->g_lat = 90 - ((pcpos->y[0]-33)*91*91*91 + (pcpos->y[1]-33)*91*91 + (pcpos->y[2]-33)*91 + (pcpos->y[3]-33)) / 380926.0;
}
else
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in compressed latitude. Must be in range of '!' to '{'.\n");
}
A->g_lat = G_UNKNOWN;
}
if (isdigit91(pcpos->x[0]) && isdigit91(pcpos->x[1]) && isdigit91(pcpos->x[2]) && isdigit91(pcpos->x[3]))
{
A->g_lon = -180 + ((pcpos->x[0]-33)*91*91*91 + (pcpos->x[1]-33)*91*91 + (pcpos->x[2]-33)*91 + (pcpos->x[3]-33)) / 190463.0;
}
else
{
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in compressed longitude. Must be in range of '!' to '{'.\n");
}
A->g_lon = G_UNKNOWN;
}
if (pcpos->sym_table_id == '/' || pcpos->sym_table_id == '\\' || isupper((int)(pcpos->sym_table_id))) {
/* primary or alternate or alternate with upper case overlay. */
A->g_symbol_table = pcpos->sym_table_id;
}
else if (pcpos->sym_table_id >= 'a' && pcpos->sym_table_id <= 'j') {
/* Lower case a-j are used to represent overlay characters 0-9 */
/* because a digit here would mean normal (non-compressed) location. */
A->g_symbol_table = pcpos->sym_table_id - 'a' + '0';
}
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid symbol table id for compressed position.\n");
}
A->g_symbol_table = '/';
}
A->g_symbol_code = pcpos->symbol_code;
if (pcpos->c == ' ') {
; /* ignore other two bytes */
}
else if (((pcpos->t - 33) & 0x18) == 0x10) {
A->g_altitude_ft = pow(1.002, (pcpos->c - 33) * 91 + pcpos->s - 33);
}
else if (pcpos->c == '{')
{
A->g_range = 2.0 * pow(1.08, pcpos->s - 33);
}
else if (pcpos->c >= '!' && pcpos->c <= 'z')
{
/* For a weather station, this is wind information. */
A->g_course = (pcpos->c - 33) * 4;
A->g_speed_mph = DW_KNOTS_TO_MPH(pow(1.08, pcpos->s - 33) - 1.0);
}
}
/*------------------------------------------------------------------
*
* Function: get_latitude_8
*
* Purpose: Convert 8 byte latitude encoding to degrees.
*
* Inputs: plat - Pointer to first byte.
*
* Returns: Double precision value in degrees. Negative for South.
*
* Description: Latitude is expressed as a fixed 8-character field, in degrees
* and decimal minutes (to two decimal places), followed by the
* letter N for north or S for south.
* The protocol spec specifies upper case but I've seen lower
* case so this will accept either one.
* Latitude degrees are in the range 00 to 90. Latitude minutes
* are expressed as whole minutes and hundredths of a minute,
* separated by a decimal point.
* For example:
* 4903.50N is 49 degrees 3 minutes 30 seconds north.
* In generic format examples, the latitude is shown as the 8-character
* string ddmm.hhN (i.e. degrees, minutes and hundredths of a minute north).
*
* Bug: We don't properly deal with position ambiguity where trailing
* digits might be replaced by spaces. We simply treat them like zeros.
*
* Errors: Return G_UNKNOWN for any type of error.
*
* Should probably print an error message.
*
*------------------------------------------------------------------*/
double get_latitude_8 (char *p, int quiet)
{
struct lat_s {
unsigned char deg[2];
unsigned char minn[2];
char dot;
unsigned char hmin[2];
char ns;
} *plat;
double result = 0;
plat = (void *)p;
if (isdigit(plat->deg[0]))
result += ((plat->deg[0]) - '0') * 10;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in latitude. Found '%c' when expecting 0-9 for tens of degrees.\n", plat->deg[0]);
}
return (G_UNKNOWN);
}
if (isdigit(plat->deg[1]))
result += ((plat->deg[1]) - '0') * 1;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in latitude. Found '%c' when expecting 0-9 for degrees.\n", plat->deg[1]);
}
return (G_UNKNOWN);
}
if (plat->minn[0] >= '0' && plat->minn[0] <= '5')
result += ((plat->minn[0]) - '0') * (10. / 60.);
else if (plat->minn[0] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in latitude. Found '%c' when expecting 0-5 for tens of minutes.\n", plat->minn[0]);
}
return (G_UNKNOWN);
}
if (isdigit(plat->minn[1]))
result += ((plat->minn[1]) - '0') * (1. / 60.);
else if (plat->minn[1] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in latitude. Found '%c' when expecting 0-9 for minutes.\n", plat->minn[1]);
}
return (G_UNKNOWN);
}
if (plat->dot != '.') {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Unexpected character \"%c\" found where period expected in latitude.\n", plat->dot);
}
return (G_UNKNOWN);
}
if (isdigit(plat->hmin[0]))
result += ((plat->hmin[0]) - '0') * (0.1 / 60.);
else if (plat->hmin[0] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in latitude. Found '%c' when expecting 0-9 for tenths of minutes.\n", plat->hmin[0]);
}
return (G_UNKNOWN);
}
if (isdigit(plat->hmin[1]))
result += ((plat->hmin[1]) - '0') * (0.01 / 60.);
else if (plat->hmin[1] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in latitude. Found '%c' when expecting 0-9 for hundredths of minutes.\n", plat->hmin[1]);
}
return (G_UNKNOWN);
}
// The spec requires upper case for hemisphere. Accept lower case but warn.
if (plat->ns == 'N') {
return (result);
}
else if (plat->ns == 'n') {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: Lower case n found for latitude hemisphere. Specification requires upper case N or S.\n");
}
return (result);
}
else if (plat->ns == 'S') {
return ( - result);
}
else if (plat->ns == 's') {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: Lower case s found for latitude hemisphere. Specification requires upper case N or S.\n");
}
return ( - result);
}
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Error: '%c' found for latitude hemisphere. Specification requires upper case N or s.\n", plat->ns);
}
return (G_UNKNOWN);
}
}
/*------------------------------------------------------------------
*
* Function: get_longitude_9
*
* Purpose: Convert 9 byte longitude encoding to degrees.
*
* Inputs: plat - Pointer to first byte.
*
* Returns: Double precision value in degrees. Negative for West.
*
* Description: Longitude is expressed as a fixed 9-character field, in degrees and
* decimal minutes (to two decimal places), followed by the letter E
* for east or W for west.
* Longitude degrees are in the range 000 to 180. Longitude minutes are
* expressed as whole minutes and hundredths of a minute, separated by a
* decimal point.
* For example:
* 07201.75W is 72 degrees 1 minute 45 seconds west.
* In generic format examples, the longitude is shown as the 9-character
* string dddmm.hhW (i.e. degrees, minutes and hundredths of a minute west).
*
* Bug: We don't properly deal with position ambiguity where trailing
* digits might be replaced by spaces. We simply treat them like zeros.
*
* Errors: Return G_UNKNOWN for any type of error.
*
* Example:
*
*------------------------------------------------------------------*/
double get_longitude_9 (char *p, int quiet)
{
struct lat_s {
unsigned char deg[3];
unsigned char minn[2];
char dot;
unsigned char hmin[2];
char ew;
} *plon;
double result = 0;
plon = (void *)p;
if (plon->deg[0] == '0' || plon->deg[0] == '1')
result += ((plon->deg[0]) - '0') * 100;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in longitude. Found '%c' when expecting 0 or 1 for hundreds of degrees.\n", plon->deg[0]);
}
return (G_UNKNOWN);
}
if (isdigit(plon->deg[1]))
result += ((plon->deg[1]) - '0') * 10;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in longitude. Found '%c' when expecting 0-9 for tens of degrees.\n", plon->deg[1]);
}
return (G_UNKNOWN);
}
if (isdigit(plon->deg[2]))
result += ((plon->deg[2]) - '0') * 1;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in longitude. Found '%c' when expecting 0-9 for degrees.\n", plon->deg[2]);
}
return (G_UNKNOWN);
}
if (plon->minn[0] >= '0' && plon->minn[0] <= '5')
result += ((plon->minn[0]) - '0') * (10. / 60.);
else if (plon->minn[0] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in longitude. Found '%c' when expecting 0-5 for tens of minutes.\n", plon->minn[0]);
}
return (G_UNKNOWN);
}
if (isdigit(plon->minn[1]))
result += ((plon->minn[1]) - '0') * (1. / 60.);
else if (plon->minn[1] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in longitude. Found '%c' when expecting 0-9 for minutes.\n", plon->minn[1]);
}
return (G_UNKNOWN);
}
if (plon->dot != '.') {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Unexpected character \"%c\" found where period expected in longitude.\n", plon->dot);
}
return (G_UNKNOWN);
}
if (isdigit(plon->hmin[0]))
result += ((plon->hmin[0]) - '0') * (0.1 / 60.);
else if (plon->hmin[0] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in longitude. Found '%c' when expecting 0-9 for tenths of minutes.\n", plon->hmin[0]);
}
return (G_UNKNOWN);
}
if (isdigit(plon->hmin[1]))
result += ((plon->hmin[1]) - '0') * (0.01 / 60.);
else if (plon->hmin[1] == ' ')
;
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Invalid character in longitude. Found '%c' when expecting 0-9 for hundredths of minutes.\n", plon->hmin[1]);
}
return (G_UNKNOWN);
}
// The spec requires upper case for hemisphere. Accept lower case but warn.
if (plon->ew == 'E') {
return (result);
}
else if (plon->ew == 'e') {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: Lower case e found for longitude hemisphere. Specification requires upper case E or W.\n");
}
return (result);
}
else if (plon->ew == 'W') {
return ( - result);
}
else if (plon->ew == 'w') {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: Lower case w found for longitude hemisphere. Specification requires upper case E or W.\n");
}
return ( - result);
}
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Error: '%c' found for longitude hemisphere. Specification requires upper case E or W.\n", plon->ew);
}
return (G_UNKNOWN);
}
}
/*------------------------------------------------------------------
*
* Function: get_timestamp
*
* Purpose: Convert 7 byte timestamp to unix time value.
*
* Inputs: p - Pointer to first byte.
*
* Returns: time_t data type. (UTC)
*
* Description:
*
* Day/Hours/Minutes (DHM) format is a fixed 7-character field, consisting of
* a 6-digit day/time group followed by a single time indicator character (z or
* /). The day/time group consists of a two-digit day-of-the-month (01-31) and
* a four-digit time in hours and minutes.
* Times can be expressed in zulu (UTC/GMT) or local time. For example:
*
* 092345z is 2345 hours zulu time on the 9th day of the month.
* 092345/ is 2345 hours local time on the 9th day of the month.
*
* It is recommended that future APRS implementations only transmit zulu
* format on the air.
*
* Note: The time in Status Reports may only be in zulu format.
*
* Hours/Minutes/Seconds (HMS) format is a fixed 7-character field,
* consisting of a 6-digit time in hours, minutes and seconds, followed by the h
* time-indicator character. For example:
*
* 234517h is 23 hours 45 minutes and 17 seconds zulu.
*
* Note: This format may not be used in Status Reports.
*
* Month/Day/Hours/Minutes (MDHM) format is a fixed 8-character field,
* consisting of the month (01-12) and day-of-the-month (01-31), followed by
* the time in hours and minutes zulu. For example:
*
* 10092345 is 23 hours 45 minutes zulu on October 9th.
*
* This format is only used in reports from stand-alone "positionless" weather
* stations (i.e. reports that do not contain station position information).
*
*
* Bugs: Local time not implemented yet.
* 8 character form not implemented yet.
*
* Boundary conditions are not handled properly.
* For example, suppose it is 00:00:03 on January 1.
* We receive a timestamp of 23:59:58 (which was December 31).
* If we simply replace the time, and leave the current date alone,
* the result is about a day into the future.
*
*
* Example:
*
*------------------------------------------------------------------*/
time_t get_timestamp (decode_aprs_t *A, char *p)
{
struct dhm_s {
char day[2];
char hours[2];
char minutes[2];
char tic; /* Time indicator character. */
/* z = UTC. */
/* / = local - not implemented yet. */
} *pdhm;
struct hms_s {
char hours[2];
char minutes[2];
char seconds[2];
char tic; /* Time indicator character. */
/* h = UTC. */
} *phms;
struct tm *ptm;
time_t ts;
ts = time(NULL);
ptm = gmtime(&ts);
pdhm = (void *)p;
phms = (void *)p;
if (pdhm->tic == 'z' || pdhm->tic == '/') /* Wrong! */
{
int j;
j = (pdhm->day[0] - '0') * 10 + pdhm->day[1] - '0';
//text_color_set(DW_COLOR_DECODED);
//dw_printf("Changing day from %d to %d\n", ptm->tm_mday, j);
ptm->tm_mday = j;
j = (pdhm->hours[0] - '0') * 10 + pdhm->hours[1] - '0';
//dw_printf("Changing hours from %d to %d\n", ptm->tm_hour, j);
ptm->tm_hour = j;
j = (pdhm->minutes[0] - '0') * 10 + pdhm->minutes[1] - '0';
//dw_printf("Changing minutes from %d to %d\n", ptm->tm_min, j);
ptm->tm_min = j;
}
else if (phms->tic == 'h')
{
int j;
j = (phms->hours[0] - '0') * 10 + phms->hours[1] - '0';
//text_color_set(DW_COLOR_DECODED);
//dw_printf("Changing hours from %d to %d\n", ptm->tm_hour, j);
ptm->tm_hour = j;
j = (phms->minutes[0] - '0') * 10 + phms->minutes[1] - '0';
//dw_printf("Changing minutes from %d to %d\n", ptm->tm_min, j);
ptm->tm_min = j;
j = (phms->seconds[0] - '0') * 10 + phms->seconds[1] - '0';
//dw_printf("%sChanging seconds from %d to %d\n", ptm->tm_sec, j);
ptm->tm_sec = j;
}
return (mktime(ptm));
}
/*------------------------------------------------------------------
*
* Function: get_maidenhead
*
* Purpose: See if we have a maidenhead locator.
*
* Inputs: p - Pointer to first byte.
*
* Returns: 0 = not found.
* 4 = possible 4 character locator found.
* 6 = possible 6 character locator found.
*
* It is not stored anywhere or processed.
*
* Description:
*
* The maidenhead locator system is sometimes used as a more compact,
* and less precise, alternative to numeric latitude and longitude.
*
* It is composed of:
* a pair of letters in range A to R.
* a pair of digits in range of 0 to 9.
* a pair of letters in range of A to X.
*
* The APRS spec says that all letters must be transmitted in upper case.
*
*
* Examples from APRS spec:
*
* IO91SX
* IO91
*
*
*------------------------------------------------------------------*/
int get_maidenhead (decode_aprs_t *A, char *p)
{
if (toupper(p[0]) >= 'A' && toupper(p[0]) <= 'R' &&
toupper(p[1]) >= 'A' && toupper(p[1]) <= 'R' &&
isdigit(p[2]) && isdigit(p[3])) {
/* We have 4 characters matching the rule. */
if (islower(p[0]) || islower(p[1])) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: Lower case letter in Maidenhead locator. Specification requires upper case.\n");
}
}
if (toupper(p[4]) >= 'A' && toupper(p[4]) <= 'X' &&
toupper(p[5]) >= 'A' && toupper(p[5]) <= 'X') {
/* We have 6 characters matching the rule. */
if (islower(p[4]) || islower(p[5])) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: Lower case letter in Maidenhead locator. Specification requires upper case.\n");
}
}
return 6;
}
return 4;
}
return 0;
}
/*------------------------------------------------------------------
*
* Function: data_extension_comment
*
* Purpose: A fixed length 7-byte field may follow APRS position datA->
*
* Inputs: pdext - Pointer to optional data extension and comment.
*
* Returns: true if a data extension was found.
*
* Outputs: One or more of the following, depending the data found:
*
* A->g_course
* A->g_speed_mph
* A->g_power
* A->g_height
* A->g_gain
* A->g_directivity
* A->g_range
*
* Anything left over will be put in
*
* A->g_comment
*
* Description:
*
*
*
*------------------------------------------------------------------*/
const char *dir[9] = { "omni", "NE", "E", "SE", "S", "SW", "W", "NW", "N" };
static int data_extension_comment (decode_aprs_t *A, char *pdext)
{
int n;
if (strlen(pdext) < 7) {
strlcpy (A->g_comment, pdext, sizeof(A->g_comment));
return 0;
}
/* Tyy/Cxx - Area object descriptor. */
if (pdext[0] == 'T' &&
pdext[3] == '/' &&
pdext[4] == 'C')
{
/* not decoded at this time */
process_comment (A, pdext+7, -1);
return 1;
}
/* CSE/SPD */
/* For a weather station (symbol code _) this is wind. */
/* For others, it would be course and speed. */
if (pdext[3] == '/')
{
if (sscanf (pdext, "%3d", &n))
{
A->g_course = n;
}
if (sscanf (pdext+4, "%3d", &n))
{
A->g_speed_mph = DW_KNOTS_TO_MPH(n);
}
/* Bearing and Number/Range/Quality? */
if (pdext[7] == '/' && pdext[11] == '/')
{
process_comment (A, pdext + 7 + 8, -1);
}
else {
process_comment (A, pdext+7, -1);
}
return 1;
}
/* check for Station power, height, gain. */
if (strncmp(pdext, "PHG", 3) == 0)
{
A->g_power = (pdext[3] - '0') * (pdext[3] - '0');
A->g_height = (1 << (pdext[4] - '0')) * 10;
A->g_gain = pdext[5] - '0';
if (pdext[6] >= '0' && pdext[6] <= '8') {
strlcpy (A->g_directivity, dir[pdext[6]-'0'], sizeof(A->g_directivity));
}
process_comment (A, pdext+7, -1);
return 1;
}
/* check for precalculated radio range. */
if (strncmp(pdext, "RNG", 3) == 0)
{
if (sscanf (pdext+3, "%4d", &n))
{
A->g_range = n;
}
process_comment (A, pdext+7, -1);
return 1;
}
/* DF signal strength, */
if (strncmp(pdext, "DFS", 3) == 0)
{
//A->g_strength = pdext[3] - '0';
A->g_height = (1 << (pdext[4] - '0')) * 10;
A->g_gain = pdext[5] - '0';
if (pdext[6] >= '0' && pdext[6] <= '8') {
strlcpy (A->g_directivity, dir[pdext[6]-'0'], sizeof(A->g_directivity));
}
process_comment (A, pdext+7, -1);
return 1;
}
process_comment (A, pdext, -1);
return 0;
}
/*------------------------------------------------------------------
*
* Function: decode_tocall
*
* Purpose: Extract application from the destination.
*
* Inputs: dest - Destination address.
* Don't care if SSID is present or not.
*
* Outputs: A->g_mfr
*
* Description: For maximum flexibility, we will read the
* data file at run time rather than compiling it in.
*
* For the most recent version, download from:
*
* http://www.aprs.org/aprs11/tocalls.txt
*
* Windows version: File must be in current working directory.
*
* Linux version: Search order is current working directory
* then /usr/share/direwolf directory.
*
*------------------------------------------------------------------*/
// If I was more ambitious, this would dynamically allocate enough
// storage based on the file contents. Just stick in a constant for
// now. This takes an insignificant amount of space and
// I don't anticipate tocalls.txt growing that quickly.
// Version 1.4 - add message if too small instead of silently ignoring the rest.
// Dec. 2016 tocalls.txt has 153 destination addresses.
#define MAX_TOCALLS 200
static struct tocalls_s {
unsigned char len;
char prefix[7];
char *description;
} tocalls[MAX_TOCALLS];
static int num_tocalls = 0;
// Make sure the array is null terminated.
static const char *search_locations[] = {
(const char *) "tocalls.txt",
#ifndef __WIN32__
(const char *) "/usr/share/direwolf/tocalls.txt",
(const char *) "/usr/local/share/direwolf/tocalls.txt",
#endif
(const char *) NULL
};
static int tocall_cmp (const void *px, const void *py)
{
const struct tocalls_s *x = (struct tocalls_s *)px;
const struct tocalls_s *y = (struct tocalls_s *)py;
if (x->len != y->len) return (y->len - x->len);
return (strcmp(x->prefix, y->prefix));
}
static void decode_tocall (decode_aprs_t *A, char *dest)
{
FILE *fp = 0;
int n = 0;
static int first_time = 1;
char stuff[100];
char *p = NULL;
char *r = NULL;
//dw_printf("debug: decode_tocall(\"%s\")\n", dest);
/*
* Extract the calls and descriptions from the file.
*
* Use only lines with exactly these formats:
*
* APN Network nodes, digis, etc
* APWWxx APRSISCE win32 version
* | | |
* 00000000001111111111
* 01234567890123456789...
*
* Matching will be with only leading upper case and digits.
*/
// TODO: Look for this in multiple locations.
// For example, if application was installed in /usr/local/bin,
// we might want to put this in /usr/local/share/aprs
// If search strategy changes, be sure to keep symbols_init in sync.
if (first_time) {
n = 0;
fp = NULL;
do {
if(search_locations[n] == NULL) break;
fp = fopen(search_locations[n++], "r");
} while (fp == NULL);
if (fp != NULL) {
while (fgets(stuff, sizeof(stuff), fp) != NULL && num_tocalls < MAX_TOCALLS) {
p = stuff + strlen(stuff) - 1;
while (p >= stuff && (*p == '\r' || *p == '\n')) {
*p-- = '\0';
}
// dw_printf("debug: %s\n", stuff);
if (stuff[0] == ' ' &&
stuff[4] == ' ' &&
stuff[5] == ' ' &&
stuff[6] == 'A' &&
stuff[7] == 'P' &&
stuff[12] == ' ' &&
stuff[13] == ' ' ) {
p = stuff + 6;
r = tocalls[num_tocalls].prefix;
while (isupper((int)(*p)) || isdigit((int)(*p))) {
*r++ = *p++;
}
*r = '\0';
if (strlen(tocalls[num_tocalls].prefix) > 2) {
tocalls[num_tocalls].description = strdup(stuff+14);
tocalls[num_tocalls].len = strlen(tocalls[num_tocalls].prefix);
// dw_printf("debug %d: %d '%s' -> '%s'\n", num_tocalls, tocalls[num_tocalls].len, tocalls[num_tocalls].prefix, tocalls[num_tocalls].description);
num_tocalls++;
}
}
else if (stuff[0] == ' ' &&
stuff[1] == 'A' &&
stuff[2] == 'P' &&
isupper((int)(stuff[3])) &&
stuff[4] == ' ' &&
stuff[5] == ' ' &&
stuff[6] == ' ' &&
stuff[12] == ' ' &&
stuff[13] == ' ' ) {
p = stuff + 1;
r = tocalls[num_tocalls].prefix;
while (isupper((int)(*p)) || isdigit((int)(*p))) {
*r++ = *p++;
}
*r = '\0';
if (strlen(tocalls[num_tocalls].prefix) > 2) {
tocalls[num_tocalls].description = strdup(stuff+14);
tocalls[num_tocalls].len = strlen(tocalls[num_tocalls].prefix);
// dw_printf("debug %d: %d '%s' -> '%s'\n", num_tocalls, tocalls[num_tocalls].len, tocalls[num_tocalls].prefix, tocalls[num_tocalls].description);
num_tocalls++;
}
}
if (num_tocalls == MAX_TOCALLS) { // oops. might have discarded some.
text_color_set(DW_COLOR_ERROR);
dw_printf("MAX_TOCALLS needs to be larger than %d to handle contents of 'tocalls.txt'.\n", MAX_TOCALLS);
}
}
fclose(fp);
/*
* Sort by decreasing length so the search will go
* from most specific to least specific.
* Example: APY350 or APY008 would match those specific
* models before getting to the more generic APY.
*/
#if defined(__WIN32__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__APPLE__)
qsort (tocalls, num_tocalls, sizeof(struct tocalls_s), tocall_cmp);
#else
qsort (tocalls, num_tocalls, sizeof(struct tocalls_s), (__compar_fn_t)tocall_cmp);
#endif
}
else {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: Could not open 'tocalls.txt'.\n");
dw_printf("System types in the destination field will not be decoded.\n");
}
}
first_time = 0;
//for (n=0; n<num_tocalls; n++) {
// dw_printf("sorted %d: %d '%s' -> '%s'\n", n, tocalls[n].len, tocalls[n].prefix, tocalls[n].description);
//}
}
for (n=0; n<num_tocalls; n++) {
if (strncmp(dest, tocalls[n].prefix, tocalls[n].len) == 0) {
strlcpy (A->g_mfr, tocalls[n].description, sizeof(A->g_mfr));
return;
}
}
} /* end decode_tocall */
/*------------------------------------------------------------------
*
* Function: substr_se
*
* Purpose: Extract substring given start and end+1 offset.
*
* Inputs: src - Source string
*
* start - Start offset.
*
* endp1 - End offset+1 for ease of use with regexec result.
*
* Outputs: dest - Destination for substring.
*
*------------------------------------------------------------------*/
// TODO: potential for buffer overflow here.
static void substr_se (char *dest, const char *src, int start, int endp1)
{
int len = endp1 - start;
if (start < 0 || endp1 < 0 || len <= 0) {
dest[0] = '\0';
return;
}
memcpy (dest, src + start, len);
dest[len] = '\0';
} /* end substr_se */
/*------------------------------------------------------------------
*
* Function: process_comment
*
* Purpose: Extract optional items from the comment.
*
* Inputs: pstart - Pointer to start of left over information field.
*
* clen - Length of comment or -1 to take it all.
*
* Outputs: A->g_telemetry - Base 91 telemetry |ss1122|
* A->g_altitude_ft - from /A=123456
* A->g_lat - Might be adjusted from !DAO!
* A->g_lon - Might be adjusted from !DAO!
* A->g_aprstt_loc - Private extension to !DAO!
* A->g_freq
* A->g_tone
* A->g_offset
* A->g_comment - Anything left over after extracting above.
*
* Description: After processing fixed and possible optional parts
* of the message, everything left over is a comment.
*
* Except!!!
*
* There are could be some other pieces of data, with
* particular formats, buried in there.
* Pull out those special items and put everything
* else into A->g_comment.
*
* References: http://www.aprs.org/info/freqspec.txt
*
* 999.999MHz T100 +060 Voice frequency.
*
* http://www.aprs.org/datum.txt
*
* !DAO! APRS precision and Datum option.
*
* Protocol reference, end of chaper 6.
*
* /A=123456 Altitude
*
* What can appear in a comment?
*
* Chapter 5 of the APRS spec ( http://www.aprs.org/doc/APRS101.PDF ) says:
*
* "The comment may contain any printable ASCII characters (except | and ~,
* which are reserved for TNC channel switching)."
*
* "Printable" would exclude character values less than space (00100000), e.g.
* tab, carriage return, line feed, nul. Sometimes we see carriage return
* (00001010) at the end of APRS packets. This would be in violation of the
* specification.
*
* The base 91 telemetry format (http://he.fi/doc/aprs-base91-comment-telemetry.txt ),
* which is not part of the APRS spec, uses the | character in the comment to delimit encoded
* telemetry data. This would be in violation of the original spec.
*
* The APRS Spec Addendum 1.2 Proposals ( http://www.aprs.org/aprs12/datum.txt)
* adds use of UTF-8 (https://en.wikipedia.org/wiki/UTF-8 )for the free form text in
* messages and comments. It can't be used in the fixed width fields.
*
* Non-ASCII characters are represented by multi-byte sequences. All bytes in these
* multi-byte sequences have the most significant bit set to 1. Using UTF-8 would not
* add any nul (00000000) bytes to the stream.
*
* There are two known cases where we can have a nul character value.
*
* * The Kenwood TM-D710A sometimes sends packets like this:
*
* VA3AJ-9>T2QU6X,VE3WRC,WIDE1,K8UNS,WIDE2*:4P<0x00><0x0f>4T<0x00><0x0f>4X<0x00><0x0f>4\<0x00>`nW<0x1f>oS8>/]"6M}driving fast=
* K4JH-9>S5UQ6X,WR4AGC-3*,WIDE1*:4P<0x00><0x0f>4T<0x00><0x0f>4X<0x00><0x0f>4\<0x00>`jP}l"&>/]"47}QRV from the EV =
*
* Notice that the data type indicator of "4" is not valid. If we remove
* 4P<0x00><0x0f>4T<0x00><0x0f>4X<0x00><0x0f>4\<0x00> we are left with a good MIC-E format.
* This same thing has been observed from others and is intermittent.
*
* * AGW Tracker can send UTF-16 if an option is selected. This can introduce nul bytes.
* This is wrong. It should be using UTF-8 and I'm not going to accomodate it here.
*
*
* The digipeater and IGate functions should pass along anything exactly the
* we received it, even if it is invalid. If different implementations try to fix it up
* somehow, like changing unprintable characters to spaces, we will only make things
* worse and thwart the duplicate detection.
*
*------------------------------------------------------------------*/
/* CTCSS tones in various formats to avoid conversions every time. */
#define NUM_CTCSS 50
static const int i_ctcss[NUM_CTCSS] = {
67, 69, 71, 74, 77, 79, 82, 85, 88, 91,
94, 97, 100, 103, 107, 110, 114, 118, 123, 127,
131, 136, 141, 146, 151, 156, 159, 162, 165, 167,
171, 173, 177, 179, 183, 186, 189, 192, 196, 199,
203, 206, 210, 218, 225, 229, 233, 241, 250, 254 };
static const float f_ctcss[NUM_CTCSS] = {
67.0, 69.3, 71.9, 74.4, 77.0, 79.7, 82.5, 85.4, 88.5, 91.5,
94.8, 97.4, 100.0, 103.5, 107.2, 110.9, 114.8, 118.8, 123.0, 127.3,
131.8, 136.5, 141.3, 146.2, 151.4, 156.7, 159.8, 162.2, 165.5, 167.9,
171.3, 173.8, 177.3, 179.9, 183.5, 186.2, 189.9, 192.8, 196.6, 199.5,
203.5, 206.5, 210.7, 218.1, 225.7, 229.1, 233.6, 241.8, 250.3, 254.1 };
static const char * s_ctcss[NUM_CTCSS] = {
"67.0", "69.3", "71.9", "74.4", "77.0", "79.7", "82.5", "85.4", "88.5", "91.5",
"94.8", "97.4", "100.0", "103.5", "107.2", "110.9", "114.8", "118.8", "123.0", "127.3",
"131.8", "136.5", "141.3", "146.2", "151.4", "156.7", "159.8", "162.2", "165.5", "167.9",
"171.3", "173.8", "177.3", "179.9", "183.5", "186.2", "189.9", "192.8", "196.6", "199.5",
"203.5", "206.5", "210.7", "218.1", "225.7", "229.1", "233.6", "241.8", "250.3", "254.1" };
#define sign(x) (((x)>=0)?1:(-1))
static void process_comment (decode_aprs_t *A, char *pstart, int clen)
{
static int first_time = 1;
static regex_t std_freq_re; /* Frequency in standard format. */
static regex_t std_tone_re; /* Tone in standard format. */
static regex_t std_toff_re; /* Explicitly no tone. */
static regex_t std_dcs_re; /* Digital codes squelch in standard format. */
static regex_t std_offset_re; /* Xmit freq offset in standard format. */
static regex_t std_range_re; /* Range in standard format. */
static regex_t dao_re; /* DAO */
static regex_t alt_re; /* /A= altitude */
static regex_t bad_freq_re; /* Likely frequency, not standard format */
static regex_t bad_tone_re; /* Likely tone, not standard format */
static regex_t base91_tel_re; /* Base 91 compressed telemetry data. */
int e;
char emsg[100];
#define MAXMATCH 4
regmatch_t match[MAXMATCH];
char temp[sizeof(A->g_comment)];
int keep_going;
/*
* No sense in recompiling the patterns and freeing every time.
*/
if (first_time)
{
/*
* Frequency must be at the at the beginning.
* Others can be anywhere in the comment.
*/
//e = regcomp (&freq_re, "^[0-9A-O][0-9][0-9]\\.[0-9][0-9][0-9 ]MHz( [TCDtcd][0-9][0-9][0-9]| Toff)?( [+-][0-9][0-9][0-9])?", REG_EXTENDED);
// Freq optionally preceded by space or /.
// Third fractional digit can be space instead.
// "MHz" should be exactly that capitalization.
// Print warning later it not.
e = regcomp (&std_freq_re, "^[/ ]?([0-9A-O][0-9][0-9]\\.[0-9][0-9][0-9 ])([Mm][Hh][Zz])", REG_EXTENDED);
if (e) {
regerror (e, &std_freq_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
// If no tone, we might gobble up / after any data extension,
// We could also have a space but it's not required.
// I don't understand the difference between T and C so treat the same for now.
// We can also have "off" instead of number to explicitly mean none.
e = regcomp (&std_tone_re, "^[/ ]?([TtCc][012][0-9][0-9])", REG_EXTENDED);
if (e) {
regerror (e, &std_tone_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&std_toff_re, "^[/ ]?[TtCc][Oo][Ff][Ff]", REG_EXTENDED);
if (e) {
regerror (e, &std_toff_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&std_dcs_re, "^[/ ]?[Dd]([0-7][0-7][0-7])", REG_EXTENDED);
if (e) {
regerror (e, &std_dcs_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&std_offset_re, "^[/ ]?([+-][0-9][0-9][0-9])", REG_EXTENDED);
if (e) {
regerror (e, &std_offset_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&std_range_re, "^[/ ]?[Rr]([0-9][0-9])([mk])", REG_EXTENDED);
if (e) {
regerror (e, &std_range_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&dao_re, "!([A-Z][0-9 ][0-9 ]|[a-z][!-{ ][!-{ ]|T[0-9 B][0-9 ])!", REG_EXTENDED);
if (e) {
regerror (e, &dao_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&alt_re, "/A=[0-9][0-9][0-9][0-9][0-9][0-9]", REG_EXTENDED);
if (e) {
regerror (e, &alt_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&bad_freq_re, "[0-9][0-9][0-9]\\.[0-9][0-9][0-9]?", REG_EXTENDED);
if (e) {
regerror (e, &bad_freq_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
e = regcomp (&bad_tone_re, "(^|[^0-9.])([6789][0-9]\\.[0-9]|[12][0-9][0-9]\\.[0-9]|67|77|100|123)($|[^0-9.])", REG_EXTENDED);
if (e) {
regerror (e, &bad_tone_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
// TODO: Would like to restrict to even length something like this: ([!-{][!-{]){2,7}
e = regcomp (&base91_tel_re, "\\|([!-{]{4,14})\\|", REG_EXTENDED);
if (e) {
regerror (e, &base91_tel_re, emsg, sizeof(emsg));
dw_printf("%s:%d: %s\n", __FILE__, __LINE__, emsg);
}
first_time = 0;
}
/*
* If clen is >= 0, take only specified number of characters.
* Otherwise, take it all.
*/
if (clen < 0) {
clen = strlen(pstart);
}
/*
* Watch out for buffer overflow.
* KG6AZZ reports that there is a local digipeater that seems to
* malfunction ocassionally. It corrupts the packet, as it is
* digipeated, causing the comment to be hundreds of characters long.
*/
if (clen > (int)(sizeof(A->g_comment) - 1)) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Comment is extremely long, %d characters.\n", clen);
dw_printf("Please report this, along with surrounding lines, so we can find the cause.\n");
}
clen = sizeof(A->g_comment) - 1;
}
if (clen > 0) {
memcpy (A->g_comment, pstart, (size_t)clen);
A->g_comment[clen] = '\0';
}
else {
A->g_comment[0] = '\0';
}
/*
* Look for frequency in the standard format at start of comment.
* If that fails, try to obtain from object name.
*/
if (regexec (&std_freq_re, A->g_comment, MAXMATCH, match, 0) == 0)
{
char sftemp[30];
char smtemp[10];
//dw_printf("matches= %d - %d, %d - %d, %d - %d\n", (int)(match[0].rm_so), (int)(match[0].rm_eo),
// (int)(match[1].rm_so), (int)(match[1].rm_eo),
// (int)(match[2].rm_so), (int)(match[2].rm_eo) );
substr_se (sftemp, A->g_comment, match[1].rm_so, match[1].rm_eo);
substr_se (smtemp, A->g_comment, match[2].rm_so, match[2].rm_eo);
switch (sftemp[0]) {
case 'A': A->g_freq = 1200 + atof(sftemp+1); break;
case 'B': A->g_freq = 2300 + atof(sftemp+1); break;
case 'C': A->g_freq = 2400 + atof(sftemp+1); break;
case 'D': A->g_freq = 3400 + atof(sftemp+1); break;
case 'E': A->g_freq = 5600 + atof(sftemp+1); break;
case 'F': A->g_freq = 5700 + atof(sftemp+1); break;
case 'G': A->g_freq = 5800 + atof(sftemp+1); break;
case 'H': A->g_freq = 10100 + atof(sftemp+1); break;
case 'I': A->g_freq = 10200 + atof(sftemp+1); break;
case 'J': A->g_freq = 10300 + atof(sftemp+1); break;
case 'K': A->g_freq = 10400 + atof(sftemp+1); break;
case 'L': A->g_freq = 10500 + atof(sftemp+1); break;
case 'M': A->g_freq = 24000 + atof(sftemp+1); break;
case 'N': A->g_freq = 24100 + atof(sftemp+1); break;
case 'O': A->g_freq = 24200 + atof(sftemp+1); break;
default: A->g_freq = atof(sftemp); break;
}
if (strncmp(smtemp, "MHz", 3) != 0) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Warning: \"%s\" has non-standard capitalization and might not be recognized by some systems.\n", smtemp);
dw_printf("For best compatibility, it should be exactly like this: \"MHz\" (upper,upper,lower case)\n");
}
}
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment));
}
else if (strlen(A->g_name) > 0) {
// Try to extract sensible number from object/item name.
double x = atof (A->g_name);
if ((x >= 144 && x <= 148) ||
(x >= 222 && x <= 225) ||
(x >= 420 && x <= 450) ||
(x >= 902 && x <= 928)) {
A->g_freq = x;
}
}
/*
* Next, look for tone, DCS code, and range.
* Examples always have them in same order but it's not clear
* whether any order is allowed after possible frequency.
*
* TODO: Convert integer tone to original value for display.
* TODO: samples in zfreq-test3.txt
*/
keep_going = 1;
while (keep_going) {
if (regexec (&std_tone_re, A->g_comment, MAXMATCH, match, 0) == 0) {
char sttemp[10]; /* includes leading letter */
int f;
int i;
substr_se (sttemp, A->g_comment, match[1].rm_so, match[1].rm_eo);
// Try to convert from integer to proper value.
f = atoi(sttemp+1);
for (i = 0; i < NUM_CTCSS; i++) {
if (f == i_ctcss[i]) {
A->g_tone = f_ctcss[i];
break;
}
}
if (A->g_tone == G_UNKNOWN) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Bad CTCSS/PL specification: \"%s\"\n", sttemp);
dw_printf("Integer does not correspond to standard tone.\n");
}
}
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment));
}
else if (regexec (&std_toff_re, A->g_comment, MAXMATCH, match, 0) == 0) {
dw_printf ("NO tone\n");
A->g_tone = 0;
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment));
}
else if (regexec (&std_dcs_re, A->g_comment, MAXMATCH, match, 0) == 0) {
char sttemp[10]; /* three octal digits */
substr_se (sttemp, A->g_comment, match[1].rm_so, match[1].rm_eo);
A->g_dcs = strtoul (sttemp, NULL, 8);
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment)-match[0].rm_so);
}
else if (regexec (&std_offset_re, A->g_comment, MAXMATCH, match, 0) == 0) {
char sttemp[10]; /* includes leading sign */
substr_se (sttemp, A->g_comment, match[1].rm_so, match[1].rm_eo);
A->g_offset = 10 * atoi(sttemp);
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment)-match[0].rm_so);
}
else if (regexec (&std_range_re, A->g_comment, MAXMATCH, match, 0) == 0) {
char sttemp[10]; /* should be two digits */
char sutemp[10]; /* m for miles or k for km */
substr_se (sttemp, A->g_comment, match[1].rm_so, match[1].rm_eo);
substr_se (sutemp, A->g_comment, match[2].rm_so, match[2].rm_eo);
if (strcmp(sutemp, "m") == 0) {
A->g_range = atoi(sttemp);
}
else {
A->g_range = DW_KM_TO_MILES(atoi(sttemp));
}
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment)-match[0].rm_so);
}
else {
keep_going = 0;
}
}
/*
* Telemetry data, in base 91 compressed format appears as 2 to 7 pairs
* of base 91 digits, surrounded by | at start and end.
*/
if (regexec (&base91_tel_re, A->g_comment, MAXMATCH, match, 0) == 0)
{
char tdata[30]; /* Should be 4 to 14 characters. */
//dw_printf("compressed telemetry start=%d, end=%d\n", (int)(match[0].rm_so), (int)(match[0].rm_eo));
substr_se (tdata, A->g_comment, match[1].rm_so, match[1].rm_eo);
//dw_printf("compressed telemetry data = \"%s\"\n", tdata);
telemetry_data_base91 (A->g_src, tdata, A->g_telemetry, sizeof(A->g_telemetry));
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment)-match[0].rm_so);
}
/*
* Latitude and Longitude in the form DD MM.HH has a resolution of about 60 feet.
* The !DAO! option allows another digit or almost two for greater resolution.
*
* This would not make sense to use this with a compressed location which
* already has much greater resolution.
*
* It surprized me to see this in a MIC-E message.
* MIC-E has resolution of .01 minute so it would make sense to have it as an option.
*/
if (regexec (&dao_re, A->g_comment, MAXMATCH, match, 0) == 0)
{
int d = A->g_comment[match[0].rm_so+1];
int a = A->g_comment[match[0].rm_so+2];
int o = A->g_comment[match[0].rm_so+3];
//dw_printf("start=%d, end=%d\n", (int)(match[0].rm_so), (int)(match[0].rm_eo));
/*
* Private extension for APRStt
*/
if (d == 'T') {
if (a == ' ' && o == ' ') {
snprintf (A->g_aprstt_loc, sizeof(A->g_aprstt_loc), "APRStt corral location");
}
else if (isdigit(a) && o == ' ') {
snprintf (A->g_aprstt_loc, sizeof(A->g_aprstt_loc), "APRStt location %c of 10", a);
}
else if (isdigit(a) && isdigit(o)) {
snprintf (A->g_aprstt_loc, sizeof(A->g_aprstt_loc), "APRStt location %c%c of 100", a, o);
}
else if (a == 'B' && isdigit(o)) {
snprintf (A->g_aprstt_loc, sizeof(A->g_aprstt_loc), "APRStt location %c%c...", a, o);
}
}
else if (isupper(d))
{
/*
* This adds one extra digit to each. Dao adds extra digit like:
*
* Lat: DD MM.HHa
* Lon: DDD HH.HHo
*/
if (isdigit(a)) {
A->g_lat += (a - '0') / 60000.0 * sign(A->g_lat);
}
if (isdigit(o)) {
A->g_lon += (o - '0') / 60000.0 * sign(A->g_lon);
}
}
else if (islower(d))
{
/*
* This adds almost two extra digits to each like this:
*
* Lat: DD MM.HHxx
* Lon: DDD HH.HHxx
*
* The original character range '!' to '{' is first converted
* to an integer in range of 0 to 90. It is multiplied by 1.1
* to stretch the numeric range to be 0 to 99.
*/
/*
* The spec appears to be wrong. It says '}' is the maximum value when it should be '{'.
*/
if (isdigit91(a)) {
A->g_lat += (a - B91_MIN) * 1.1 / 600000.0 * sign(A->g_lat);
}
if (isdigit91(o)) {
A->g_lon += (o - B91_MIN) * 1.1 / 600000.0 * sign(A->g_lon);
}
}
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment)-match[0].rm_so);
}
/*
* Altitude in feet. /A=123456
*/
if (regexec (&alt_re, A->g_comment, MAXMATCH, match, 0) == 0)
{
//dw_printf("start=%d, end=%d\n", (int)(match[0].rm_so), (int)(match[0].rm_eo));
strlcpy (temp, A->g_comment + match[0].rm_eo, sizeof(temp));
A->g_comment[match[0].rm_eo] = '\0';
A->g_altitude_ft = atoi(A->g_comment + match[0].rm_so + 3);
strlcpy (A->g_comment + match[0].rm_so, temp, sizeof(A->g_comment)-match[0].rm_so);
}
//dw_printf("Final comment='%s'\n", A->g_comment);
/*
* Finally look for something that looks like frequency or CTCSS tone
* in the remaining comment. Point this out and suggest the
* standardized format.
* Don't complain if we have already found a valid value.
*/
if (A->g_freq == G_UNKNOWN && regexec (&bad_freq_re, A->g_comment, MAXMATCH, match, 0) == 0)
{
char bad[30];
char good[30];
double x;
substr_se (bad, A->g_comment, match[0].rm_so, match[0].rm_eo);
x = atof(bad);
if ((x >= 144 && x <= 148) ||
(x >= 222 && x <= 225) ||
(x >= 420 && x <= 450) ||
(x >= 902 && x <= 928)) {
if ( ! A->g_quiet) {
snprintf (good, sizeof(good), "%07.3fMHz", x);
text_color_set(DW_COLOR_ERROR);
dw_printf("\"%s\" in comment looks like a frequency in non-standard format.\n", bad);
dw_printf("For most systems to recognize it, use exactly this form \"%s\" at beginning of comment.\n", good);
}
if (A->g_freq == G_UNKNOWN) {
A->g_freq = x;
}
}
}
if (A->g_tone == G_UNKNOWN && regexec (&bad_tone_re, A->g_comment, MAXMATCH, match, 0) == 0)
{
char bad1[30]; /* original 99.9 or 999.9 format or one of 67 77 100 123 */
char bad2[30]; /* 99.9 or 999.9 format. ".0" appended for special cases. */
char good[30];
int i;
substr_se (bad1, A->g_comment, match[2].rm_so, match[2].rm_eo);
strlcpy (bad2, bad1, sizeof(bad2));
if (strcmp(bad2, "67") == 0 || strcmp(bad2, "77") == 0 || strcmp(bad2, "100") == 0 || strcmp(bad2, "123") == 0) {
strlcat (bad2, ".0", sizeof(bad2));
}
// TODO: Why wasn't freq/PL recognized here?
// Should we recognize some cases of single decimal place as frequency?
//DECODED[194] N8VIM audio level = 27 [NONE]
//[0] N8VIM>BEACON,WIDE2-2:!4240.85N/07133.99W_PHG72604/ Pepperell, MA-> WX. 442.9+ PL100<0x0d>
//Didn't find wind direction in form c999.
//Didn't find wind speed in form s999.
//Didn't find wind gust in form g999.
//Didn't find temperature in form t999.
//Weather Report, WEATHER Station (blue)
//N 42 40.8500, W 071 33.9900
//, "PHG72604/ Pepperell, MA-> WX. 442.9+ PL100"
for (i = 0; i < NUM_CTCSS; i++) {
if (strcmp (s_ctcss[i], bad2) == 0) {
if ( ! A->g_quiet) {
snprintf (good, sizeof(good), "T%03d", i_ctcss[i]);
text_color_set(DW_COLOR_ERROR);
dw_printf("\"%s\" in comment looks like it might be a CTCSS tone in non-standard format.\n", bad1);
dw_printf("For most systems to recognize it, use exactly this form \"%s\" at near beginning of comment, after any frequency.\n", good);
}
if (A->g_tone == G_UNKNOWN) {
A->g_tone = atof(bad2);
}
break;
}
}
}
if ((A->g_offset == 6000 || A->g_offset == -6000) && A->g_freq >= 144 && A->g_freq <= 148) {
if ( ! A->g_quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("A transmit offset of 6 MHz on the 2 meter band doesn't seem right.\n");
dw_printf("Each unit is 10 kHz so you should probably be using \"-060\" or \"+060\"\n");
}
}
/*
* TODO: samples in zfreq-test4.txt
*/
}
/* end process_comment */
/*------------------------------------------------------------------
*
* Function: main
*
* Purpose: Main program for standalone test program.
*
* Inputs: stdin for raw data to decode.
* This is in the usual display format either from
* a TNC, findu.com, aprs.fi, etc. e.g.
*
* N1EDF-9>T2QT8Y,W1CLA-1,WIDE1*,WIDE2-2,00000:`bSbl!Mv/`"4%}_ <0x0d>
*
* WB2OSZ-1>APN383,qAR,N1EDU-2:!4237.14NS07120.83W#PHG7130Chelmsford, MA
*
* New for 1.5:
*
* Also allow hexadecimal bytes for raw AX.25 or KISS. e.g.
*
* 00 82 a0 ae ae 62 60 e0 82 96 68 84 40 40 60 9c 68 b0 ae 86 40 e0 40 ae 92 88 8a 64 63 03 f0 3e 45 4d 36 34 6e 65 2f 23 20 45 63 68 6f 6c 69 6e 6b 20 31 34 35 2e 33 31 30 2f 31 30 30 68 7a 20 54 6f 6e 65
*
* If it begins with 00 or C0 (which would be impossible for AX.25 address) process as KISS.
* Also print these formats.
*
* Outputs: stdout
*
* Description: Compile like this to make a standalone test program.
*
* gcc -o decode_aprs -DDECAMAIN decode_aprs.c ax25_pad.c ...
*
* ./decode_aprs < decode_aprs.txt
*
* aprs.fi precedes raw data with a time stamp which you
* would need to remove first.
*
* cut -c26-999 tmp/kj4etp-9.txt | decode_aprs.exe
*
*
* Restriction: MIC-E message type can be problematic because it
* it can use unprintable characters in the information field.
*
* Dire Wolf and aprs.fi print it in hexadecimal. Example:
*
* KB1KTR-8>TR3U6T,KB1KTR-9*,WB2OSZ-1*,WIDE2*,qAR,W1XM:`c1<0x1f>l!t>/>"4^}
* ^^^^^^
* ||||||
* What does findu.com do in this case?
*
* ax25_from_text recognizes this representation so it can be used
* to decode raw data later.
*
* TODO: To make it more useful,
* - Remove any leading timestamp.
* - Remove any "qA*" and following from the path.
* - Handle non-APRS frames properly.
*
*------------------------------------------------------------------*/
#if DECAMAIN
#include "kiss_frame.h"
/* Stub for stand-alone decoder. */
void nmea_send_waypoint (char *wname_in, double dlat, double dlong, char symtab, char symbol,
float alt, float course, float speed, char *comment)
{
return;
}
// TODO: hex_dump is currently in server.c and we don't want to drag that in.
// Someday put it in a more reasonable place, with other general utilities, and remove the private copy here.
static void hex_dump (unsigned char *p, int len)
{
int n, i, offset;
offset = 0;
while (len > 0) {
n = len < 16 ? len : 16;
dw_printf (" %03x: ", offset);
for (i=0; i<n; i++) {
dw_printf (" %02x", p[i]);
}
for (i=n; i<16; i++) {
dw_printf (" ");
}
dw_printf (" ");
for (i=0; i<n; i++) {
dw_printf ("%c", isprint(p[i]) ? p[i] : '.');
}
dw_printf ("\n");
p += 16;
offset += 16;
len -= 16;
}
}
// Do we have two hexadecimal digits followed by whitespace or end of line?
#define ISHEX2(x) (isxdigit(x[0]) && isxdigit(x[1]) && (x[2] == '\0' || isspace(x[2])))
#define MAXLINE 9000
#define MAXBYTES 3000
int main (int argc, char *argv[])
{
char stuff[MAXLINE];
unsigned char bytes[MAXBYTES];
int num_bytes;
char *p;
packet_t pp;
#if __WIN32__
// Select UTF-8 code page for console output.
// http://msdn.microsoft.com/en-us/library/windows/desktop/ms686036(v=vs.85).aspx
// This is the default I see for windows terminal:
// >chcp
// Active code page: 437
//Restore on exit? oldcp = GetConsoleOutputCP();
SetConsoleOutputCP(CP_UTF8);
#else
/*
* Default on Raspian & Ubuntu Linux is fine. Don't know about others.
*
* Should we look at LANG environment variable and issue a warning
* if it doesn't look something like en_US.UTF-8 ?
*/
#endif
if (argc >= 2) {
if (freopen (argv[1], "r", stdin) == NULL) {
fprintf(stderr, "Can't open %s for read.\n", argv[1]);
exit(1);
}
}
text_color_init(1);
text_color_set(DW_COLOR_INFO);
while (fgets(stuff, sizeof(stuff), stdin) != NULL)
{
p = stuff + strlen(stuff) - 1;
while (p >= stuff && (*p == '\r' || *p == '\n')) {
*p-- = '\0';
}
if (strlen(stuff) == 0 || stuff[0] == '#')
{
/* comment or blank line */
text_color_set(DW_COLOR_INFO);
dw_printf("%s\n", stuff);
continue;
}
else
{
/* Try to process it. */
text_color_set(DW_COLOR_REC);
dw_printf("\n%s\n", stuff);
// Do we have monitor format, KISS, or AX.25 frame?
p = stuff;
while (isspace(*p)) p++;
if (ISHEX2(p)) {
// Collect a bunch of hexadecimal numbers.
num_bytes = 0;
while (ISHEX2(p) && num_bytes < MAXBYTES) {
bytes[num_bytes++] = strtoul(p, NULL, 16);
p += 2;
while (isspace(*p)) p++;
}
if (num_bytes == 0 || *p != '\0') {
text_color_set(DW_COLOR_ERROR);
dw_printf("Parse error around column %d.\n", (int)(long)(p - stuff) + 1);
dw_printf("Was expecting only space separated 2 digit hexadecimal numbers.\n\n");
continue; // next line
}
// If we have 0xC0 at start, remove it and expect same at end.
if (bytes[0] == FEND) {
if (bytes[1] != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Was expecting to find 00 after the initial C0.\n");
continue;
}
if (bytes[num_bytes-1] == FEND) {
text_color_set(DW_COLOR_INFO);
dw_printf("Removing KISS FEND characters at beginning and end.\n");
int n;
for (n = 0; n < num_bytes-1; n++) {
bytes[n] = bytes[n+1];
}
num_bytes -= 2;
}
else {
text_color_set(DW_COLOR_INFO);
dw_printf("Removing KISS FEND character at beginning. Was expecting another at end.\n");
int n;
for (n = 0; n < num_bytes-1; n++) {
bytes[n] = bytes[n+1];
}
num_bytes -= 1;
}
}
if (bytes[0] == 0) {
// Treat as KISS. Undo any KISS encoding.
unsigned char kiss_frame[MAXBYTES];
int kiss_len = num_bytes;
memcpy (kiss_frame, bytes, num_bytes);
text_color_set(DW_COLOR_DEBUG);
dw_printf ("--- KISS frame ---\n");
hex_dump (kiss_frame, kiss_len);
// Put FEND at end to keep kiss_unwrap happy.
// Having one at the begining is optional.
kiss_frame[kiss_len++] = FEND;
// In the more general case, we would need to include
// the command byte because it could be escaped.
// Here we know it is 0, so we take a short cut and
// remove it before, rather than after, the conversion.
num_bytes = kiss_unwrap (kiss_frame + 1, kiss_len - 1, bytes);
}
// Treat as AX.25.
alevel_t alevel;
memset (&alevel, 0, sizeof(alevel));
pp = ax25_from_frame(bytes, num_bytes, alevel);
if (pp != NULL) {
char addrs[120];
unsigned char *pinfo;
int info_len;
decode_aprs_t A;
text_color_set(DW_COLOR_DEBUG);
dw_printf ("--- AX.25 frame ---\n");
ax25_hex_dump (pp);
dw_printf ("-------------------\n");
ax25_format_addrs (pp, addrs);
text_color_set(DW_COLOR_DECODED);
dw_printf ("%s:", addrs);
info_len = ax25_get_info (pp, &pinfo);
ax25_safe_print ((char *)pinfo, info_len, 1); // Display non-ASCII to hexadecimal.
dw_printf ("\n");
decode_aprs (&A, pp, 0); // Extract information into structure.
decode_aprs_print (&A); // Now print it in human readable format.
(void)ax25_check_addresses(pp); // Errors for invalid addresses.
ax25_delete (pp);
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf("Could not construct AX.25 frame from bytes supplied!\n\n");
}
}
else {
// Normal monitoring format.
pp = ax25_from_text(stuff, 1);
if (pp != NULL) {
decode_aprs_t A;
decode_aprs (&A, pp, 0); // Extract information into structure.
decode_aprs_print (&A); // Now print it in human readable format.
(void)ax25_check_addresses(pp); // Errors for invalid addresses.
// Future? Add -d option to include hex dump and maybe KISS?
ax25_delete (pp);
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf("ERROR - Could not parse monitoring format input!\n\n");
}
}
}
}
return (0);
}
#endif /* DECAMAIN */
/* end decode_aprs.c */
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