Working with A GPS got Error on SUPL session nrf9160 stack over Flow and nrf9160dk reboot again

[Waqar Ahmed]

Hi
I want to Integrate GPS(with A GPS assistance needed)with AWS iot example. when i start GPS on aws connect event ready .SUPL is initialized successfully and even SUPL socket is created successfully .inside SUPL session function i got error stack overflow and my nrf9160 dk reboot .I am using nRF Connect Sdk 1.5.0

I am using SUPL client library version 0.7.0 download from Nordic provided link and extract to the path  mention in nordic website.

[Waqar Ahmed]

No i am getting Supl timeout error

[Håkon Alseth]

Hi,

 

Is the GPS running at this time? if yes, can you please stop it (not close it, just stop the gps), and re-start it afterwards?

 

Kind regards,

Håkon

[Waqar Ahmed]

is there any code to start and stop?

[Håkon Alseth]

See the gps.h::gps_stop() and gps.h::gps_start() functions if using the nrf9160_gps driver.

If using the gnss api directly, please see the nrfxlib gnss documentation: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrfxlib/nrf_modem/doc/gnss_interface.html#starting-gnss

 

Kind regards,

Håkon

[Waqar Ahmed]

Hi Hakon

i used both of these function already.Some time after 3 to 7 read again tries session created successfully and some its failed to create supl session,

[Waqar Ahmed]

Hi  Hakon,

I had figure out one more thing that if I start GPS on AWS event case AWS_IOT_EVT_READY:
SUPL session created successfully(even no need to stop and start again) every time but if I start GPS LTE connected event k_sem_give(&lte_connected);
Then all of these problem are raised.

[Waqar Ahmed]

Hi Hakon,
I am still unable to find the Solution of this read again and again.some time it work or some time its trying to read again and again .Supl session even after gps_stop,and then gps_start.

[Håkon Alseth]

Hi,

 

Waqar Ahmed said:

I had figure out one more thing that if I start GPS on AWS event case AWS_IOT_EVT_READY:
SUPL session created successfully(even no need to stop and start again) every time but if I start GPS LTE connected event k_sem_give(&lte_connected);
Then all of these problem are raised.

You should also not start a GPS session before the LTE Link is idle.

It seems that you are creating two TCP (TLS) connections simultaneously, which can generate a lot of traffic on-air. If that is the case, it makes sense that you are able to get a better connection if you wait until your cloud is up and running before starting the AGPS session.

 

Kind regards,

Håkon