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decode_aprs.h
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/* decode_aprs.h */
#ifndef DECODE_APRS_H
#define DECODE_APRS_H 1
#ifndef G_UNKNOWN
#include "latlong.h"
#endif
#ifndef AX25_MAX_ADDR_LEN
#include "ax25_pad.h"
#endif
#ifndef APRSTT_LOC_DESC_LEN
#include "aprs_tt.h"
#endif
typedef struct decode_aprs_s {
int g_quiet; /* Suppress error messages when decoding. */
char g_src[AX25_MAX_ADDR_LEN];
char g_dest[AX25_MAX_ADDR_LEN];
char g_data_type_desc[100]; /* APRS data type description. Telemetry descriptions get pretty long. */
char g_symbol_table; /* The Symbol Table Identifier character selects one */
/* of the two Symbol Tables, or it may be used as */
/* single-character (alpha or numeric) overlay, as follows: */
/* / Primary Symbol Table (mostly stations) */
/* \ Alternate Symbol Table (mostly Objects) */
/* 0-9 Numeric overlay. Symbol from Alternate Symbol */
/* Table (uncompressed lat/long data format) */
/* a-j Numeric overlay. Symbol from Alternate */
/* Symbol Table (compressed lat/long data */
/* format only). i.e. a-j maps to 0-9 */
/* A-Z Alpha overlay. Symbol from Alternate Symbol Table */
char g_symbol_code; /* Where the Symbol Table Identifier is 0-9 or A-Z (or a-j */
/* with compressed position data only), the symbol comes from */
/* the Alternate Symbol Table, and is overlaid with the */
/* identifier (as a single digit or a capital letter). */
char g_aprstt_loc[APRSTT_LOC_DESC_LEN]; /* APRStt location from !DAO! */
double g_lat, g_lon; /* Location, degrees. Negative for South or West. */
/* Set to G_UNKNOWN if missing or error. */
char g_maidenhead[12]; /* 4 or 6 (or 8?) character maidenhead locator. */
char g_name[12]; /* Object or item name. Max. 9 characters. */
char g_addressee[12]; /* Addressee for a "message." Max. 9 characters. */
/* Also for Directed Station Query which is a */
/* special case of message. */
enum message_subtype_e { message_subtype_invalid = 0,
message_subtype_message,
message_subtype_ack,
message_subtype_rej,
message_subtype_telem_parm,
message_subtype_telem_unit,
message_subtype_telem_eqns,
message_subtype_telem_bits,
message_subtype_directed_query
} g_message_subtype; /* Various cases of the overloaded "message." */
char g_message_number[12]; /* Message number. Should be 1 - 5 alphanumeric characters if used. */
/* Addendum 1.1 has new format {mm} or {mm}aa with only two */
/* characters for message number and an ack riding piggyback. */
float g_speed_mph; /* Speed in MPH. */
/* The APRS transmission uses knots so watch out for */
/* conversions when sending and receiving APRS packets. */
float g_course; /* 0 = North, 90 = East, etc. */
int g_power; /* Transmitter power in watts. */
int g_height; /* Antenna height above average terrain, feet. */
int g_gain; /* Antenna gain in dB. */
char g_directivity[12]; /* Direction of max signal strength */
float g_range; /* Precomputed radio range in miles. */
float g_altitude_ft; /* Feet above median sea level. */
/* I used feet here because the APRS specification */
/* has units of feet for alititude. Meters would be */
/* more natural to the other 96% of the world. */
char g_mfr[80]; /* Manufacturer or application. */
char g_mic_e_status[32]; /* MIC-E message. */
double g_freq; /* Frequency, MHz */
float g_tone; /* CTCSS tone, Hz, one fractional digit */
int g_dcs; /* Digital coded squelch, print as 3 octal digits. */
int g_offset; /* Transmit offset, kHz */
char g_query_type[12]; /* General Query: APRS, IGATE, WX, ... */
/* Addressee is NOT set. */
/* Directed Station Query: exactly 5 characters. */
/* APRSD, APRST, PING?, ... */
/* Addressee is set. */
double g_footprint_lat; /* A general query may contain a foot print. */
double g_footprint_lon; /* Set all to G_UNKNOWN if not used. */
float g_footprint_radius; /* Radius in miles. */
char g_query_callsign[12]; /* Directed query may contain callsign. */
/* e.g. tell me all objects from that callsign. */
char g_weather[500]; /* Weather. Can get quite long. Rethink max size. */
char g_telemetry[256]; /* Telemetry data. Rethink max size. */
char g_comment[256]; /* Comment. */
} decode_aprs_t;
extern void decode_aprs (decode_aprs_t *A, packet_t pp, int quiet, char *third_party_src);
extern void decode_aprs_print (decode_aprs_t *A);
#endif