nrf9160 with P-GPS: SecureFault before LTE is connected

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

Michal — Mon, 06 May 2024 14:22:34 GMT

Hello again,

The fix has been merged in the following pull request:

https://github.com/nrfconnect/sdk-nrf/pull/15071/

And will be included in NCS 2.7.0.

Thank you again for reporting that bug and a possible fix.

Best regards,

Michal

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

Michal — Thu, 18 Apr 2024 15:01:54 GMT

Thank you for reporting that, I have checked that this is how the code looks in the main branch currently and I am forwarding this to the developers.

Best regards,

Michal

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

papatel — Thu, 11 Apr 2024 13:50:13 GMT

We did a bunch of P-GPS experimentation today and I came across your post on accident. I believe I know how to resolve your problem. The SDK has a suboptimal sequence when requesting P-GPS injection data that could lead to a null pointer condition.

In the file nrf_cloud_pgps.c at the end of the file there is a code snippet that looks like below:

if (evt_handler) {
			evt.type = PGPS_EVT_AVAILABLE;
			evt.prediction = found_prediction;
			evt_handler(&evt);
		}

Simply change it to the below and it has a high chance of solving your problem (trying to inject a null prediction pointer!!)

if (evt_handler && found_prediction) {
			evt.type = PGPS_EVT_AVAILABLE;
			evt.prediction = found_prediction;
			evt_handler(&evt);
		}

P-GPS is such a critical feature, I wished Nordic tested it more and made it more accessible. Not cool that prediction data isn't available publicly like other GPS solutions providers.

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

Michal — Wed, 19 Apr 2023 15:03:40 GMT

At least with a DK, the TF-M debug output comes through UART1 by default. For this, UART1 needs to be enabled and these Kconfig options set:

CONFIG_TFM_LOG_LEVEL_SILENCE=n

CONFIG_TFM_EXCEPTION_INFO_DUMP=y

CONFIG_TFM_SPM_LOG_LEVEL_DEBUG=y

Could you also enable debug logging for the Location and nRF Cloud libraries and provide an application log? The last option increases the log buffer size, as P-GPS may output quite a lot of traces.

CONFIG_LOCATION_LOG_LEVEL_DBG=y

CONFIG_NRF_CLOUD_GPS_LOG_LEVEL_DBG=y

CONFIG_LOG_BUFFER_SIZE=10240

Best regards,

Michal

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

napei_ — Sun, 16 Apr 2023 03:54:05 GMT

Hi Michal,

NCS version 2.3.0, modem FW version 1.3.4.

We have temporarily disabled P-GPS for our solution as it's not currently a guarantee that the device will power on in LTE signal range initially before getting location.

Thanks 🙂

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

Michal — Thu, 13 Apr 2023 16:12:06 GMT

Hello, I am back in the office.

I have forwarded it to our experts and I will keep you updated.

Please tell me the NCS and modem FW versions as well.

I guess a workaround would be to make sure that you are connected to LTE when running P-GPS?

Best regards,

Michal

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

Michal — Tue, 04 Apr 2023 03:13:23 GMT

Due to holiday season (Easter) in Norway, we are a bit low in staff. I am currently out of office and I will be back after Easter. Sorry for the delays and thanks for your patience in advance. Happy Easter.

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

napei_ — Thu, 23 Mar 2023 21:43:26 GMT

Thanks for the update, and no problem.

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

Michal — Thu, 23 Mar 2023 19:08:10 GMT

Just wanted to let you know that I did not get to take a better look at it yet, hopefully next week.

Best regards,

Michal

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

napei_ — Thu, 16 Mar 2023 14:15:22 GMT

Thanks Michal, no worries at all 😊

RE: nrf9160 with P-GPS: SecureFault before LTE is connected

Michal — Thu, 16 Mar 2023 13:59:31 GMT

Hello,

It will take me some time to look into it, so I have to ask for your patience.

Best regards,

Michal