Using GPS with SUPL sample in Asset Tracker application

RE: Using GPS with SUPL sample in Asset Tracker application

Carl Richard — Thu, 03 Dec 2020 09:06:53 GMT

Hi again!

Got from the developers that if you want to test without nRF Cloud, just comment out the cloud stuff, call the relevant SUPL functions and start GPS right after.

Best regards,
Carl Richard

RE: Using GPS with SUPL sample in Asset Tracker application

Carl Richard — Thu, 03 Dec 2020 08:42:54 GMT

Hi!

I did indeed use the DK (v8.5.0) and saw the same behavior as you did for your DK. As mentioned the sample communicates with nRF Cloud for other purposes(control and location upload) so the device will have to connect to the cloud service. Have you made sure the custom board have the correct credentials and are registered for use with nRF Cloud?

Best regards,
Carl Richard

RE: Using GPS with SUPL sample in Asset Tracker application

spline_pete — Thu, 03 Dec 2020 00:45:17 GMT

I tried the AGPS sample configured for SUPL with a DK board. See attached log. It eventually gets a fix, but if you compare where my custom board stops vs the DK, it suggests that it's being blocked on cloud calls.

devzone.nordicsemi.com/.../agps_5F00_dk_5F00_20201202_5F00_1734.txt

RE: Using GPS with SUPL sample in Asset Tracker application

spline_pete — Wed, 02 Dec 2020 13:30:29 GMT

Can it show any debug info? I don't see any activity. Does it do nothing until there's a fix?

Which board did you try it with?

RE: Using GPS with SUPL sample in Asset Tracker application

Carl Richard — Wed, 02 Dec 2020 10:03:14 GMT

Hi!

When using SUPL the GPS backend handles the calls. Nothing changes in the actual sample. If you are talking about the "gps_process_agps_data" function that is called on a CLOUD_EVT_DATA_RECEIVED event then you will see that it's implemented to do nothing if not using nRF Cloud AGPS.

As the documentation states the sample communicates with the nRF Cloud for uploading data and controlling the device. I did not try with your config, but got it working with the configs I referenced earlier.

Did you try with the asset tracker?

Best regards,
Carl Richard

RE: Using GPS with SUPL sample in Asset Tracker application

spline_pete — Wed, 02 Dec 2020 00:33:46 GMT

I looked through the AGPS sample. I don't see any conditionals to omit the nrf cloud calls from the build when using SUPL. Here's what I get after making those changes to prj.conf, along with these changes:

CONFIG_NRF9160_GPS_SET_MAGPIO=n
CONFIG_NRF9160_GPS_SET_COEX0=y
CONFIG_NRF9160_GPS_COEX0_STRING="AT%XCOEX0=1,1,1565,1586"

*** Booting Zephyr OS build v2.4.0-ncs1  ***
I: A-GPS sample has started
I: Connecting to LTE network. This may take minutes.
I: PSM mode requested
+CEREG: 2,"150D","00526D02",7,0,0,"11100000","11100000"
+CSCON: 1
+CEREG: 1,"150D","00526D02",7,,,"00000010","00011111"
I: Connected to LTE network
D: COEX0 set: AT%XCOEX0=1,1,1565,1586
D: GPS socket created, fd: 1232491587
I: CLOUD_EVT_CONNECTING
I: CLOUD_EVT_CONNECTING
+CSCON: 0

RE: Using GPS with SUPL sample in Asset Tracker application

Carl Richard — Tue, 01 Dec 2020 15:17:14 GMT

Great! Please report back whether it works for you or not.

Best regards,
Carl Richard

RE: Using GPS with SUPL sample in Asset Tracker application

spline_pete — Tue, 01 Dec 2020 13:24:19 GMT

Ok, I'll try it.
Thanks.

RE: Using GPS with SUPL sample in Asset Tracker application

Carl Richard — Tue, 01 Dec 2020 12:31:01 GMT

Hi again!

Got back from the developers that it should be sufficient to add the following configs to prj.conf in the asset_tracker:

CONFIG_NRF_CLOUD_AGPS=n
CONFIG_AGPS_SRC_SUPL=y

The required functions for SUPL will be setup "behind the scenes".

Best regards,
Carl Richard

RE: Using GPS with SUPL sample in Asset Tracker application

Carl Richard — Tue, 01 Dec 2020 12:00:57 GMT

Hi, Pete!

Have you looked at the agps sample? It should show how you can use and external SUPL source for the aGPS. From what I can see the GPS driver is enabled to use aGPS(and SUPL) when configured to do so.

Best regards,
Carl Richard