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M17: Decode META Field;

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lwvmobile
2024-04-07 03:29:37 -04:00
parent bbfd4967cf
commit 4b063aaf97
1 changed files with 54 additions and 13 deletions
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67
src/m17.c
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@@ -187,14 +187,14 @@ void M17decodeLSF(dsd_state * state)
for (i = 0; i < 14; i++)
state->m17_meta[i] = (uint8_t)ConvertBitIntoBytes(&state->m17_lsf[(i*8)+112], 8);
//Examine the Meta data
//Decode Meta Data
if (lsf_et == 0 && state->m17_meta[0] != 0) //not sure if this applies universally, or just to text data byte 0 for null data
{
fprintf (stderr, " Meta:");
if (lsf_es == 0) fprintf (stderr, " Text Data");
if (lsf_es == 1) fprintf (stderr, " GNSS Pos");
if (lsf_es == 2) fprintf (stderr, " Extended CSD");
if (lsf_es == 3) fprintf (stderr, " Reserved");
uint8_t meta[15]; meta[0] = lsf_es + 90; //add identifier for pkt decoder
for (i = 0; i < 14; i++) meta[i+1] = state->m17_lsf[i];
fprintf (stderr, "\n ");
//Note: We don't have opts here, so in the future, if we need it, we will need to pass it here
decodeM17PKT (NULL, state, meta, 15); //decode META
}
if (lsf_et == 2)
@@ -3055,7 +3055,10 @@ void decodeM17PKT(dsd_opts * opts, dsd_state * state, uint8_t * input, int len)
else if (protocol == 4) fprintf (stderr, " IPv4;");
else if (protocol == 5) fprintf (stderr, " SMS;");
else if (protocol == 6) fprintf (stderr, " Winlink;");
else if (protocol == 99)fprintf (stderr, " 1600 Arbitrary Data;"); //internal format only
else if (protocol == 90)fprintf (stderr, " Meta Text Data;"); //internal format only from meta
else if (protocol == 91)fprintf (stderr, " Meta GNSS Position Data;"); //internal format only from meta
else if (protocol == 92)fprintf (stderr, " Meta Extended CSD;"); //internal format only from meta
else if (protocol == 99)fprintf (stderr, " 1600 Arbitrary Data;"); //internal format only from 1600
else fprintf (stderr, " Res: %02X;", protocol);
//simple UTF-8 SMS Decoder
@@ -3071,18 +3074,56 @@ void decodeM17PKT(dsd_opts * opts, dsd_state * state, uint8_t * input, int len)
fprintf (stderr, "\n ");
}
}
else if (protocol == 99) //Just dump the 1600 Arbitrary Data as UTF-8 Encoded Test w/ len 9
// else if (protocol == 90)
// {
// //treat Extended CSD as Base40? or UTF-8?
// }
else if (protocol == 91)
{
//Decode GNSS Elements
uint8_t data_source = input[1];
uint8_t station_type = input[2];
uint8_t lat_deg_int = input[3];
uint32_t lat_deg_dec = (input[4] << 8) + input[5];
uint8_t lon_deg_int = input[6];
uint32_t lon_deg_dec = (input[7] << 8) + input[8];
uint8_t indicators = input[9]; //nsew, validity bits
uint16_t altitude = (input[10] << 8) + input[11];
uint16_t bearing = (input[12] << 8) + input[13];
uint8_t speed = input[14];
fprintf (stderr, "\n Latitude: %03d.%05d ", lat_deg_int, lat_deg_dec * 65535);
if (indicators & 1) fprintf (stderr, "S;");
else fprintf (stderr, "N;");
fprintf (stderr, " Longitude: %03d.%05d ", lon_deg_int, lon_deg_dec * 65535);
if (indicators & 2) fprintf (stderr, "W;");
else fprintf (stderr, "E;");
if (indicators & 4) fprintf (stderr, "Altitude: %d;", altitude + 1500);
if (indicators & 8) fprintf (stderr, "Speed: %d MPH;", speed);
if (indicators & 0x10) fprintf (stderr, "Bearing: %d Degrees;", bearing);
if (data_source == 0) fprintf (stderr, " M17 Client;");
else if (data_source == 1) fprintf (stderr, " OpenRTX;");
else if (data_source == 0xFF) fprintf (stderr, " Other;");
else fprintf (stderr, " Reserved Data Source: %02X;", data_source);
if (station_type == 0) fprintf (stderr, " Fixed Station;");
else if (station_type == 1) fprintf (stderr, " Mobile Station;");
else if (station_type == 2) fprintf (stderr, " Handheld;");
else fprintf (stderr, " Reserved Station Type: %02X;", station_type);
}
else if (protocol >= 90) //dump any other formats sent as text
{
fprintf (stderr, " ");
for (i = 1; i < len; i++)
{
fprintf (stderr, "%c", input[i]);
}
}
else //if
else
{
//decode or just dump the raw data?
fprintf (stderr, " ");
for (i = 1; i < len; i++)
fprintf (stderr, "%02X", input[i]);
}
}