/**
* Transmit APRS telemetry configuration
*/
uint32_t aprs_encode_telemetry_configuration(uint8_t* message, mod_t mod, telemetryConfig_t type)
{
char temp[4];
ax25_t packet;
packet.data = message;
packet.max_size = 512; // TODO: replace 512 with real size
packet.mod = mod;
ax25_send_header(&packet, APRS_CALLSIGN, APRS_SSID, APRS_PATH); // Header
ax25_send_byte(&packet, ':'); // Message flag
// Callsign
ax25_send_string(&packet, APRS_CALLSIGN);
ax25_send_byte(&packet, '-');
chsnprintf(temp, sizeof(temp), "%d", APRS_SSID);
ax25_send_string(&packet, temp);
ax25_send_string(&packet, " :"); // Message separator
switch(type) {
case CONFIG_PARM:
ax25_send_string(&packet, "PARM.Battery,Solar,Temp,Charge,Discharge");
break;
case CONFIG_UNIT:
ax25_send_string(&packet, "UNIT.Volt,Volt,degC,mW,mW");
break;
case CONFIG_EQNS:
ax25_send_string(&packet,
"EQNS."
"0,.001,0,"
"0,.001,0,"
"0,0.1,-100,"
"0,1,0,"
"0,1,0"
);
break;
case CONFIG_BITS:
ax25_send_string(&packet, "BITS.11111111,Pecan Balloon");
break;
}
ax25_send_footer(&packet); // Footer
nrzi_encode(&packet);
scramble(&packet);
return packet.size;
}
// Exported functions
void aprs_send()
{
char temp[12]; // Temperature (int/ext)
const struct s_address addresses[] = {
{D_CALLSIGN, D_CALLSIGN_ID}, // Destination callsign
{S_CALLSIGN, S_CALLSIGN_ID}, // Source callsign (-11 = balloon, -9 = car)
#ifdef DIGI_PATH1
{DIGI_PATH1, DIGI_PATH1_TTL}, // Digi1 (first digi in the chain)
#endif
#ifdef DIGI_PATH2
{DIGI_PATH2, DIGI_PATH2_TTL}, // Digi2 (second digi in the chain)
#endif
};
ax25_send_header(addresses, sizeof(addresses)/sizeof(s_address));
ax25_send_byte('/'); // Report w/ timestamp, no APRS messaging. $ = NMEA raw data
// ax25_send_string("021709z"); // 021709z = 2nd day of the month, 17:09 zulu (UTC/GMT)
ax25_send_string(gps_time); // 170915 = 17h:09m:15s zulu (not allowed in Status Reports)
ax25_send_byte('h');
ax25_send_string(gps_aprs_lat); // Lat: 38deg and 22.20 min (.20 are NOT seconds, but 1/100th of minutes)
ax25_send_byte('/'); // Symbol table
ax25_send_string(gps_aprs_lon); // Lon: 000deg and 25.80 min
ax25_send_byte('O'); // Symbol: O=balloon, -=QTH
snprintf(temp, 4, "%03d", (int)(gps_course + 0.5));
ax25_send_string(temp); // Course (degrees)
ax25_send_byte('/'); // and
snprintf(temp, 4, "%03d", (int)(gps_speed + 0.5));
ax25_send_string(temp); // speed (knots)
ax25_send_string("/A="); // Altitude (feet). Goes anywhere in the comment area
snprintf(temp, 7, "%06ld", (long)(meters_to_feet(gps_altitude) + 0.5));
ax25_send_string(temp);
ax25_send_string("/Ti=");
snprintf(temp, 6, "%d", sensors_int_lm60());
ax25_send_string(temp);
ax25_send_string("/Te=");
snprintf(temp, 6, "%d", sensors_ext_lm60());
ax25_send_string(temp);
ax25_send_string("/V=");
snprintf(temp, 6, "%d", sensors_vin());
ax25_send_string(temp);
ax25_send_byte(' ');
ax25_send_string(APRS_COMMENT); // Comment
ax25_send_footer();
ax25_flush_frame(); // Tell the modem to go
}
void tweet_send(const char *TWEET_MESSAGE)
{
char temp[12]; // Temperature (int/ext)
const struct s_address addresses[] = {
{D2_CALLSIGN, D2_CALLSIGN_ID}, // Destination callsign
{S2_CALLSIGN, S2_CALLSIGN_ID}, // Source callsign (-11 = balloon, -9 = car)
#ifdef DIGI_PATH1
{DIGI_PATH1, DIGI_PATH1_TTL}, // Digi1 (first digi in the chain)
#endif
#ifdef DIGI_PATH2
{DIGI_PATH2, DIGI_PATH2_TTL}, // Digi2 (second digi in the chain)
#endif
};
ax25_send_header(addresses, sizeof(addresses)/sizeof(s_address));
// ax25_send_string(":KJ6DYP-7 :");
ax25_send_string(":73S :");
ax25_send_string(TWEET_MESSAGE);
ax25_send_footer();
ax25_flush_frame(); // Tell the modem to go
}
uint32_t aprs_encode_image(uint8_t* message, mod_t mod, uint8_t *image, size_t size)
{
ax25_t packet;
packet.data = message;
packet.max_size = 512; // TODO: replace 512 with real size
packet.mod = mod;
// Encode APRS header
ax25_send_header(&packet, APRS_CALLSIGN, APRS_SSID, NULL);
ax25_send_string(&packet, "{{I");
// Encode image message
for(uint16_t i=0; i<size; i++)
ax25_send_byte(&packet, image[i]);
// Send footer
ax25_send_footer(&packet);
nrzi_encode(&packet);
scramble(&packet);
return packet.size;
}
/**
* Transmit APRS position packet. The comments are filled with:
* - Static comment (can be set in config.h)
* - Battery voltage in mV
* - Solar voltage in mW (if tracker is solar-enabled)
* - Temperature in Celcius
* - Air pressure in Pascal
* - Number of satellites being used
* - Number of cycles where GPS has been lost (if applicable in cycle)
*/
uint32_t aprs_encode_position(uint8_t* message, mod_t mod, trackPoint_t *trackPoint)
{
char temp[22];
ptime_t date = trackPoint->time;
ax25_t packet;
packet.data = message;
packet.max_size = 512; // TODO: replace 512 with real size
packet.mod = mod;
ax25_send_header(&packet, APRS_CALLSIGN, APRS_SSID, APRS_PATH);
ax25_send_byte(&packet, '/'); // Report w/ timestamp, no APRS messaging. $ = NMEA raw data
// 170915 = 17h:09m:15s zulu (not allowed in Status Reports)
chsnprintf(temp, sizeof(temp), "%02d%02d%02dh", date.hour, date.minute, date.second);
ax25_send_string(&packet, temp);
// Latitude
uint32_t y = 380926 * (90 - trackPoint->gps_lat/10000000.0);
uint32_t y3 = y / 753571;
uint32_t y3r = y % 753571;
uint32_t y2 = y3r / 8281;
uint32_t y2r = y3r % 8281;
uint32_t y1 = y2r / 91;
uint32_t y1r = y2r % 91;
// Longitude
uint32_t x = 190463 * (180 + trackPoint->gps_lon/10000000.0);
uint32_t x3 = x / 753571;
uint32_t x3r = x % 753571;
uint32_t x2 = x3r / 8281;
uint32_t x2r = x3r % 8281;
uint32_t x1 = x2r / 91;
uint32_t x1r = x2r % 91;
// Altitude
uint32_t a = logf(METER_TO_FEET(trackPoint->gps_alt)) / logf(1.002f);
uint32_t a1 = a / 91;
uint32_t a1r = a % 91;
uint8_t gpsFix = trackPoint->gps_lock ? GSP_FIX_CURRENT : GSP_FIX_OLD;
uint8_t src = NMEA_SRC_GGA;
uint8_t origin = ORIGIN_PICO;
temp[0] = SYM_GET_TABLE(APRS_SYMBOL);
temp[1] = y3+33;
temp[2] = y2+33;
temp[3] = y1+33;
temp[4] = y1r+33;
temp[5] = x3+33;
temp[6] = x2+33;
temp[7] = x1+33;
temp[8] = x1r+33;
temp[9] = SYM_GET_SYMBOL(APRS_SYMBOL);
temp[10] = a1+33;
temp[11] = a1r+33;
temp[12] = ((gpsFix << 5) | (src << 3) | origin) + 33;
temp[13] = 0;
ax25_send_string(&packet, temp);
// Comments
ax25_send_string(&packet, "SATS ");
chsnprintf(temp, sizeof(temp), "%d", trackPoint->gps_sats);
ax25_send_string(&packet, temp);
ax25_send_string(&packet, " TTFF ");
chsnprintf(temp, sizeof(temp), "%d", trackPoint->gps_ttff);
ax25_send_string(&packet, temp);
ax25_send_string(&packet, "sec");
// GPS Loss counter
if(!trackPoint->gps_lock)
{
ax25_send_string(&packet, " GPS LOSS ");
chsnprintf(temp, sizeof(temp), "%d", ++loss_of_gps_counter);
ax25_send_string(&packet, temp);
} else {
loss_of_gps_counter = 0;
}
temp[2] = 0;
ax25_send_byte(&packet, '|');
// Sequence ID
uint32_t t = trackPoint->id & 0x1FFF;
temp[0] = t/91 + 33;
temp[1] = t%91 + 33;
ax25_send_string(&packet, temp);
// Battery voltage
t = trackPoint->adc_battery;
temp[0] = t/91 + 33;
temp[1] = t%91 + 33;
ax25_send_string(&packet, temp);
// Solar voltage
t = trackPoint->adc_solar;
temp[0] = t/91 + 33;
temp[1] = t%91 + 33;
ax25_send_string(&packet, temp);
// Temperature
t = trackPoint->air_temp/10 + 1000;
temp[0] = t/91 + 33;
temp[1] = t%91 + 33;
ax25_send_string(&packet, temp);
// Battery charge
t = trackPoint->adc_charge;
temp[0] = t/91 + 33;
temp[1] = t%91 + 33;
ax25_send_string(&packet, temp);
// Battery discharge
t = trackPoint->adc_discharge;
temp[0] = t/91 + 33;
temp[1] = t%91 + 33;
ax25_send_string(&packet, temp);
ax25_send_byte(&packet, '|');
ax25_send_footer(&packet);
nrzi_encode(&packet);
scramble(&packet);
return packet.size;
}