nRF9160 DK + Asset Tracker v2, AWS A-GPS

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Fri, 04 Nov 2022 13:08:35 GMT

Hi,

You will need to enter power saving mode, either PSM or eDRX, in order to use the GPS while the LTE Link is active.

This is because the modem time-multiplexes it, meaning that you need to be in an idle state when starting the GPS.

If you are unable to enter an idle state on the LTE Link (which again is controlled by the network, ie. Telenor in this case), the gps cannot start.

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Fri, 04 Nov 2022 03:24:30 GMT

Hi again,

I've been trying to ask Telenor a couple of times now but it seems they don't really understand my request.

In the meantime I found this feature request in the github repo:
https://github.com/nrfconnect/sdk-nrf/pull/5097

It seems A-GPS / AWS IoT support was added roughly a year ago, so it should be supported. But in the end it doesn't really work for me. Would be really nice to go this route instead of trying out different sims.

Thanks!

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Tue, 11 Oct 2022 08:12:07 GMT

Hi,

Thank you for the trace. It unfortunately shows that you are indeed requesting PSM, but not receiving it from the network.

Have you contacted Telenor support and asked about this?

Do you have a SIM with "iot capabilities" from Telenor? https://telenor.se/handla/mobilabonnemang/internet-of-things/

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Mon, 10 Oct 2022 17:30:44 GMT

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/389935"]Could you try to open the Trace Collector first, then issue all the AT commands?[/quote]

Hi,

Sure, here it is:

devzone.nordicsemi.com/.../trace_2D00_2022_2D00_10_2D00_10T17_2D00_27_2D00_42.632Z.bin

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Mon, 10 Oct 2022 07:16:22 GMT

Hi,

This trace didn't include the very beginning of the tracing process, so I cannot see the initial "LTE ATTACH" messages, nor any AT commands.

Could you try to open the Trace Collector first, then issue all the AT commands?

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Sat, 08 Oct 2022 03:47:07 GMT

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/389756"]Could you take a modem trace and share that with me?[/quote]

Hello,

Please find the attached trace. Thanks for digging in to this. Let me know if you need anything else

devzone.nordicsemi.com/.../trace_2D00_2022_2D00_10_2D00_08T03_2D00_38_2D00_00.254Z.bin

FYI: This was captured using the v2 trace collector.

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Fri, 07 Oct 2022 07:31:02 GMT

Hi,

Could you take a modem trace and share that with me?

You need to compile the at_client with this config symbol, as described here:

https://infocenter.nordicsemi.com/topic/ug_trace_collector/UG/trace_collector/enable_tracing.html?cp=10_3_3_3_1

Issue these commands in the LTE Link Monitor:

AT%XMODEMTRACE=1,2
AT+CEREG=5
AT+CPSMS=1,"","","00101010","00100001"
AT+CFUN=1
AT+CFUN?

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Wed, 05 Oct 2022 17:12:21 GMT

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/389434"]You can try to manually request PSM via the AT+CPSMS command:[/quote]

I have sent the following commands:

AT+CPSMS=1,"","","10101010","00100001"

OK


AT%XMONITOR


%XMONITOR: 1,"","","24008","2AFF",7,20,"02024616",442,6400,60,28,"","11100000","11100000","01001001"

OK

Seems like it is not working?

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Wed, 05 Oct 2022 13:39:14 GMT

Hi,

Telenor in Norway by-default enables PSM in the LTE ATTACH, as seen here:

at+cereg=5                                                                                              
OK                                                                                                      
at+cfun=1                                                                                               
OK                                                                                                      
+CEREG: 2,"76C1","014ACE00",7                                                                           
+CEREG: 1,"76C1","014ACE00",7,,,"00001010","11000001"                                                   
at+cops?                                                                                                
+COPS: 0,2,"24201",7

You can try to manually request PSM via the AT+CPSMS command:

https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/nw_service/cpsms_set.html?cp=2_1_7_2_0

There's an example on requesting PSM in the end of the page.

CEREG should give you a notification after some seconds when/if that is enabled, or you can issue AT%XMONITOR to read the enabled values as well:

https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/nw_service/xmonitor_set.html?cp=2_1_7_11_0

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Tue, 04 Oct 2022 15:11:30 GMT

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/389206"]

Could you connect using at_client, and use the LTE Link Monitor (from nRF Connect for Desktop) to see the link details and share those here?

Issue:

AT+CEREG=5

AT+CFUN=1

AT+CFUN?

[/quote]


Hi Håkon,

I hope this formatting is ok for you. I masked the IP address and IMSIdentity.

AT+CEREG=5

OK

AT+CFUN=1

OK

AT+CFUN?

+CFUN: 1

OK
AT+CGSN=1

+CGSN: "351516172719544"

OK


AT+CGMI

Nordic Semiconductor ASA

OK

AT+CGMM

nRF9160-SICA

OK

AT+CGMR

mfw_nrf9160_1.3.2

OK


AT+CEMODE?

+CEMODE: 2

OK


AT%XCBAND=?

%XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)

OK

AT+CMEE?

+CMEE: 1

OK


AT+CNEC?

+CNEC: 24

OK


AT+CGEREP?

+CGEREP: 1,0

OK


AT+CIND=1,1,1

OK

AT+CEREG=5

OK


AT+CEREG?

+CEREG: 5,1,"2AFF","02024616",7,,,"11100000","11100000"

OK


AT+COPS=3,2

OK


AT+COPS?

+COPS: 0,2,"24008",7

OK

AT%XCBAND

%XCBAND: 20

OK

AT+CGDCONT?

+CGDCONT: 0,"IP","internet.telenor.se","xx.xx.xx.xx",0,0

OK

AT+CGACT?

+CGACT: 0,1

OK

AT%CESQ=1

OK


AT+CESQ

+CESQ: 99,99,255,255,13,56

OK


AT%XSIM=1

OK

AT%XSIM?

%XSIM: 1

OK


AT+CPIN?

+CPIN: READY

OK

AT+CPINR="SIM PIN"

+CPINR: "SIM PIN",3

OK

AT+CIMI

 xxxxx

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Tue, 04 Oct 2022 12:33:07 GMT

Hi,

Could you connect using at_client, and use the LTE Link Monitor (from nRF Connect for Desktop) to see the link details and share those here?

Issue:

AT+CEREG=5

AT+CFUN=1

AT+CFUN?

Then it should automatically enable verbose AT commands and notifications for you.

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Mon, 03 Oct 2022 18:38:51 GMT

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/381758"]This is unfortunately bad news. You are not getting PSM in your current connected roaming network. I would suggest that you try to obtain a home registered SIM from your local network provider instead.[/quote]

I have now obtained a home registered SIM. Unfortunately it seems like I still get the response "11100000","11100000". I'm using Telenor. How can I know beforehand which operators support PSM/eDRX?

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Wed, 17 Aug 2022 08:29:43 GMT

Hi,

Yes, those configurations will then request PSM.

[quote user="MostlyHardware"]CONFIG_LTE_PSM_REQ_RAT="00100001"[/quote]

This will give you an active time of 1 minute, which you probably do not need:

https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/nw_service/cpsms_set.html?cp=2_1_7_2_0

Try changing this to "00000001" instead, to give 2 seconds active time.

[quote user="MostlyHardware"]1.) Can the nRF9160 use two different certificates at the same time. I.e. connect both to nRFCloud and my own AWS IoT server?[/quote]

Technically yes, as long as you use different sec tags for nrf cloud.

[quote user="MostlyHardware"]

2.) Is the only option nRFCloud to download A-GPS (or P-GPS) data? It cannot be downloaded from AWS?

[/quote]

Yes, this is a feature that nrfcloud provides, and cannot be fetched with generic AWS endpoints.

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Tue, 16 Aug 2022 18:11:43 GMT

Hello,

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/381758"]You'll need certificates for nRFCloud as well.[/quote]

Two questions:

1.) Can the nRF9160 use two different certificates at the same time. I.e. connect both to nRFCloud and my own AWS IoT server?

2.) Is the only option nRFCloud to download A-GPS (or P-GPS) data? It cannot be downloaded from AWS?

I'll try a different SIM card. What do I need to configure in the prj.conf file in order for PSM to start? Is it enough with:

CONFIG_LTE_PSM_REQ_RPTAU="11000001"
CONFIG_LTE_PSM_REQ_RAT="00100001"

Many thanks!

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Tue, 16 Aug 2022 11:55:16 GMT

Hi,

[quote user="MostlyHardware"]Can I still connect to nrfcloud even though I have certificates installed for my own AWS IoT server?[/quote]

You'll need certificates for nRFCloud as well.

[quote user="MostlyHardware"]I get the response: +CEREG: 5,5,"2B1C","01B2860A",7,,,"11100000","11100000".[/quote]

This is unfortunately bad news. You are not getting PSM in your current connected roaming network. I would suggest that you try to obtain a home registered SIM from your local network provider instead.

Kind regards,

Håkon

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

MostlyHardware — Tue, 16 Aug 2022 09:38:50 GMT

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/381622"]

Asset tracker supports fetching AGPS from nrfcloud:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/asset_tracker_v2/doc/asset_tracker_v2_description.html#a-gps-and-p-gps

So you'll need to connect to nrfcloud to fetch AGPS with asset tracker v2.

[/quote]

Can I still connect to nrfcloud even though I have certificates installed for my own AWS IoT server?

[quote userid="2115" url="~/f/nordic-q-a/90971/nrf9160-dk-asset-tracker-v2-aws-a-gps/381622"]What does the AT%XMONITOR (or AT+CEREG=5, then AT+CEREG?) read back at your end?[/quote]

I get the response: +CEREG: 5,5,"2B1C","01B2860A",7,,,"11100000","11100000".

RE: nRF9160 DK + Asset Tracker v2, AWS A-GPS

Håkon Alseth — Mon, 15 Aug 2022 15:01:16 GMT

Hi,

Asset tracker supports fetching AGPS from nrfcloud:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/asset_tracker_v2/doc/asset_tracker_v2_description.html#a-gps-and-p-gps

So you'll need to connect to nrfcloud to fetch AGPS with asset tracker v2.

[quote user=""]but it doesn't track them nor do I get a GPS fix before the timeout occurs.[/quote]

If you get a fix within 30 seconds when only running the GPS, it sounds highly likely that you're blocked by the network when trying to access the GPS.

Your observation here can explain why its hard to run the GPS when you're connected to your own cloud:

[quote user=""]iBasis supports PSM in my area but it doesn't seem to be activated if I read it out via modem commands.[/quote]

What does the AT%XMONITOR (or AT+CEREG=5, then AT+CEREG?) read back at your end?

Kind regards,

Håkon