gnss_serial_set_power
ret = gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
gnss_serial_set_power(gserial, GNSS_SERIAL_OFF);
gnss_serial_set_power(gserial, GNSS_SERIAL_OFF);
return gnss_serial_set_power(gserial, GNSS_SERIAL_STANDBY);
return gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
ret = gnss_serial_set_power(gserial, GNSS_SERIAL_STANDBY);
ret = gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);