Reading GPS power options problem?

[Ivan Loncar]

Hello, 

I have a problem of reading GPS options for "NRF_SO_GNSS_POWER_SAVE_MODE" 

This is the code:

retval = nrf_getsockopt(gnss_fd, NRF_SOL_GNSS, NRF_SO_GNSS_POWER_SAVE_MODE, &psm, &psm_len);
if (retval != 0) {
	printk("Failed to send AGNSS data, type:(err: %d)\n", errno);
	return -1;
}

I always get -1, and errno value 22. This function works for "NRF_SO_GNSS_FIX_INTERVAL" option. 

Can you look into it? 

Thank you.

[Ivan Loncar]

Additionally other parameters return 0 like everything is ok, but don't update the value that is being read.

[Heidi]

Hi!

The function call you mention works for me, given that the definition of psm and psm_len look like this:

    nrf_gnss_power_save_mode_t psm;

    nrf_socklen_t psm_len = sizeof(psm);

Also, make sure to set the option beforehand, before you read try to read it. 

    int retval = nrf_setsockopt(gnss_fd,

                    NRF_SOL_GNSS,

                    NRF_SO_GNSS_POWER_SAVE_MODE,

                    &psm, &psm_len);

Best regards,

Heidi

[Ivan Loncar]

Hello, 

This is something I have already tried, and it doesn't work.  And as I mentioned in the first reply the function: nrf_getsocketopt, even when it returns 0 (like everything is fine, but isn't) for other parameters (not just NRG_SO_GNSS_POWER_SAVE_MODE) doesn't update the values correctly. 

Do I need to add some configurations in prj.conf file or something similar to be make it work?

Best regards, 

Ivan 

[Heidi]

I see. What value are you reading from &psm and what were you expecting to see? Could you please provide the full code where you set the socket option as well?

Best regards,

Heidi

[Ivan Loncar]

I am not reading anything the value remains unchanged, the one I set it to be once I create the variable. I expect to see one of three values possible and those are 0 PSM_DISABLED, 1 PSM_DUTY_CYCLING_PERFORMANCE or 2 PSM_DUTY_CYCLING_POWER. Of course I can:

static int            gnss_fd; //Global variable in the same file 
static int gnss_ctrl(uint32_t ctrl)
{
	int retval;
	nrf_gnss_power_save_mode_t psm = NRF_GNSS_PSM_DUTY_CYCLING_PERFORMANCE;
	nrf_gnss_fix_interval_t fix_interval = 1; 
	nrf_gnss_fix_retry_t    fix_retry    = 60;	
	nrf_gnss_delete_mask_t	delete_mask  = 0;
	nrf_gnss_nmea_mask_t	nmea_mask    = NRF_GNSS_NMEA_GSV_MASK |
					       NRF_GNSS_NMEA_GSA_MASK |
					       NRF_GNSS_NMEA_GLL_MASK |
					       NRF_GNSS_NMEA_GGA_MASK |
					       NRF_GNSS_NMEA_RMC_MASK;	
	nrf_socklen_t length;
	if (ctrl == GNSS_INIT_AND_START) {
		gnss_fd = nrf_socket(NRF_AF_LOCAL,
			NRF_SOCK_DGRAM,
			NRF_PROTO_GNSS);

		if (gnss_fd >= 0) {
			printk("GPS Socket created\n");
		}
		else {
			printk("Could not init socket (err: %d)\n", gnss_fd);
			return -1;
		}
		retval = nrf_setsockopt(gnss_fd,
			NRF_SOL_GNSS,
			NRF_SO_GNSS_FIX_RETRY, 
			&fix_retry,
			sizeof(fix_retry));
		if (retval != 0) {
			printk("Failed to set fix retry value\n");
			return -1;
		}
		
		length = sizeof(nrf_gnss_power_save_mode_t);
		retval = nrf_setsockopt(gnss_fd, NRF_SOL_GNSS, NRF_SO_GNSS_POWER_SAVE_MODE, &psm, length);
		if (retval != 0) {
			printk("Failed to set power save mode value\n");
			return -1;
		}
		retval = nrf_getsockopt(gnss_fd, NRF_SOL_GNSS, NRF_SO_GNSS_POWER_SAVE_MODE, &psm, &length);
		if (retval != 0) {
			printk("Failed to read power_save_mode(err: %d)\n", errno);
			return -1;
		}

		retval = nrf_setsockopt(gnss_fd,
			NRF_SOL_GNSS,
			NRF_SO_GNSS_FIX_INTERVAL,
			&fix_interval,
			sizeof(fix_interval));
		if (retval != 0) {
			printk("Failed to set fix interval value\n");
			return -1;
		}
		
		retval = nrf_setsockopt(gnss_fd,
			NRF_SOL_GNSS,
			NRF_SO_GNSS_NMEA_MASK,
			&nmea_mask,
			sizeof(nmea_mask));
		if (retval != 0) {
			printk("Failed to set nmea mask\n");
			return -1;
		}
	}
	if ((ctrl == GNSS_INIT_AND_START) ||
	    (ctrl == GNSS_RESTART)) {
		retval = nrf_setsockopt(gnss_fd,
			NRF_SOL_GNSS,
			NRF_SO_GNSS_START,
			&delete_mask,
			sizeof(delete_mask));
		if (retval != 0) {
			printk("Failed to start GPS\n");
			return -1;
		}
	}

	if (ctrl == GNSS_STOP) {
		retval = nrf_setsockopt(gnss_fd,
			NRF_SOL_GNSS,
			NRF_SO_GNSS_STOP,
			&delete_mask,
			sizeof(delete_mask));
		if (retval != 0) {
			printk("Failed to stop GPS\n");
			return -1;
		}
	}

	return 0;
}

As I stated before, I can't read any other parameters even tough nrf_getsockopt returns 0, again no changes to the passed variable. 

Can you zip the project that works for you and send it so I can see if that works for me?

P.S. I am using SDK 1.4.2 and modem FW 1.2.3 if this information is of any use. I have tested some previous versions of SDK and FW in different combinations, and continue to have problems.

Best regards,

Ivan