Time: NULL in uplink rx packet (GPS ENABLED)

Yash_Pahwa · November 6, 2020, 8:09am

We have changed our GPS module with “u-blox 7” from then we were able to fetch the time and timeSinceGpsEpoch values.

You may refer to the below link for more clarifications.

github.com

Lora-net/lora_gateway/blob/a955619271b5d0a46d32e08150acfbc1eed183b7/libloragw/src/loragw_gps.c#L281


gps_tty_dev = open(tty_path, O_RDWR | O_NOCTTY);
if (gps_tty_dev <= 0) {
    DEBUG_MSG("ERROR: TTY PORT FAIL TO OPEN, CHECK PATH AND ACCESS RIGHTS\n");
    return LGW_GPS_ERROR;
}
*fd_ptr = gps_tty_dev;

/* manage the different GPS modules families */
if (gps_family == NULL) {
    DEBUG_MSG("WARNING: this version of GPS module may not be supported\n");
} else if (strncmp(gps_family, "ubx7", 4) != 0) {
    /* The current implementation relies on proprietary messages from U-Blox */
    /* GPS modules (UBX, NAV-TIMEGPS...) and has only be tested with a u-blox 7. */
    /* Those messages allow to get NATIVE GPS time (no leap seconds) required */
    /* for class-B handling and GPS synchronization */
    /* see lgw_parse_ubx() function for details */
    DEBUG_MSG("WARNING: this version of GPS module may not be supported\n");
}

/* manage the target bitrate */
if (target_brate != 0) {