nRF9160 DK + Asset Tracker v2, AWS A-GPS

[MostlyHardware]

Hello!

I am having some GPS problems with the Asset tracker v2 firmware. It can find satellites, but it doesn't track them nor do I get a GPS fix before the timeout occurs. I was thinking to enable A-GPS to speed up the fix, but since I am connecting it to my own AWS IoT instance it doesn't seem to download any A-GPS data. How can I modify the asset tracker firmware so that it downloads A-GPS properly?

Some other info:

• I have clear skies and open surroundings for the device
• If I run the GNSS firmware it gets a GPS fix within 30 seconds, so I am suspecting some kind of interference with the modem. iBasis supports PSM in my area but it doesn't seem to be activated if I read it out via modem commands.
• The original asset tracker firmware which connected to nRFcloud worked perfectly, so the device isn't faulty.

Thanks!

[MostlyHardware]

Håkon Alseth said:

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.

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

Håkon Alseth said:

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

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

[Håkon Alseth]

Hi,

 

MostlyHardware said:

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

You'll need certificates for nRFCloud as well.

MostlyHardware said:

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

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

[MostlyHardware]

Håkon Alseth said:

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.

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?

[Håkon Alseth]

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