Tracker: Unable to setup GPS. Err: -22

I wondered if maybe the mode was already set and so commented out the error return.
It failed on the next call

[00:00:00.603,820] <err> app_gps: Failed to set GNSS use case: (-22) continuing...
[00:00:00.613,830] <err> app_gps: Failed to set GNSS power saving mode
[00:00:00.621,093] <err> app_main: Unable to setup GPS. Err: -22

I also tried enabling it on the AT interface

AT%XSYSTEMMODE=0,1,1,2

But this made no difference.

I noticed in the GNSS library API the error code (22) may also mean: the operation cannot be executed while GNSS is running.

And so I tried to turn it off before the setup call in case a bit of NVM settings started GNSS at boot.

err = app_gps_stop();
    LOG_INF("Stopped GPS: %d", err);


    /* Setup gps */
    err = app_gps_setup();
    if (err)
        LOG_ERR("Unable to setup GPS. Err: %i", err);

But I don’t think it is running - -1 means “not possible”

[00:00:00.588,165] <inf> app_main: Tracker. Version: 0.1.4-70-gf802216
[00:00:00.595,245] <wrn> app_gps: Failed to stop GPS, error: -1
[00:00:00.601,867] <inf> app_main: Stopped GPS: -1
[00:00:00.615,844] <err> app_gps: Failed to set GNSS use case: (-22) continuing...
[00:00:00.625,854] <err> app_gps: Failed to set GNSS power saving mode
[00:00:00.633,117] <err> app_main: Unable to setup GPS. Err: -22

Not sure what else I can try here….

@jaredwolff just wanted to say thanks for this.
Buried with snow today so will get to my desk after the weekend.
Thanks

Thank you for the updates Jared,
Seems to build and run.

After fiddling with KConfig I see connection updates from Golioth

Status
Connection Status offline 3 minutes ago
Last Report 4 minutes ago

Which updates every so often - but no other data in the stream. I was expecting to see GPS data.
Every time I plug the device in to look at the console, it seems to disconnect from the cell network, or at least “Backend Error” is repeated every few minutes - maybe signal coverage, who knows :/

It’s possible my choice of KConfig settings are misconfigured.
It seems I needed to change some to allow my APN and user/pass, and to set the RAT to NBIOT.
Some of these settings have been included automatically (e.g. COEX ??)

I’ll be honest, not a lot of this world of NB-IoT seems easy enough for me to grasp in the time I have available.

CONFIG_APP_VERSION_COMMIT=71
CONFIG_APP_VERSION_HASH="g90b106b"
CONFIG_APP_VERSION="0.1.4-71-g90b106b"
CONFIG_SRAM_SIZE=128
CONFIG_SRAM_BASE_ADDRESS=0x20020000
CONFIG_PDN=y
CONFIG_PDN_DEFAULTS_OVERRIDE=y
CONFIG_PDN_DEFAULT_APN="mm.lpwan"
CONFIG_PDN_DEFAULT_FAM_IPV4=y
CONFIG_PDN_DEFAULT_AUTH_PAP=y
CONFIG_PDN_DEFAULT_USERNAME="vodafone"
CONFIG_PDN_DEFAULT_PASSWORD="vodafone"
CONFIG_MODEM_ANTENNA_AT_COEX0="AT%XCOEX0=1,1,1565,1586"
CONFIG_GOLIOTH_SYSTEM_CLIENT_PSK_ID="<mydevice>@<my_project>"
CONFIG_GOLIOTH_SYSTEM_CLIENT_PSK="<hex>"
CONFIG_ADD_MCUBOOT_MEDIATE_SIM_FLASH_DTS=y
CONFIG_NEWLIB_LIBC_MIN_REQUIRED_HEAP_SIZE=2048

CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y
CONFIG_LTE_MODE_PREFERENCE_NBIOT=y
CONFIG_LTE_LC_TRACE=y

# Project specific
# CONFIG_DISCONNECT_FOR_FIRST_FIX=y