GPS UDP Project: Invalid PVT Frame, GPS Seconds Last Fix ERR

RE: GPS UDP Project: Invalid PVT Frame, GPS Seconds Last Fix ERR

Thomas — Thu, 06 Feb 2020 16:09:42 GMT

Hi, thanks that worked, but there is still some issues that im having regarding the gps position fix.

Apparently this NMEA returns incorrectly.

$GPGGA,160142.27,6326.59256,N,01025.77435,E,1,04,19.03,88.15,M,0,,*25

And gps_data.pvt returns almost 0.

RE: GPS UDP Project: Invalid PVT Frame, GPS Seconds Last Fix ERR

Håkon Alseth — Mon, 03 Feb 2020 08:06:19 GMT

Hi,

[quote user="Thaun_"]Does it require a psm supported sim card for gps to work with LTE? If so does LTE-M (NB-IoT) from Telenor work?[/quote]

Yes, to get the gps running concurrently with the network connection, you must be able to enter eDRX or PSM. A telenor SIM, that is M1 or NB1 capable, shall be able to enter PSM.

Kind regards,

Håkon

RE: GPS UDP Project: Invalid PVT Frame, GPS Seconds Last Fix ERR

Thomas — Mon, 03 Feb 2020 07:37:41 GMT

Does it require a psm supported sim card for gps to work with LTE? If so does LTE-M (NB-IoT) from Telenor work?

RE: GPS UDP Project: Invalid PVT Frame, GPS Seconds Last Fix ERR

Håkon Alseth — Fri, 31 Jan 2020 09:31:22 GMT

Hi,

The log shows:

2020-01-30T13:18:15.148Z DEBUG modem << +CEREG: 5,"76C1","014A4703",7,,,"11100000","11100000"\x0D\x0A

The returned 5 indicates that you're using a roaming SIM card:

5 – Registered, roaming.

On most networks, roaming SIM cards are not given PSM. the upper bits in the CEREG readback also decodes to "disabled". Since the GPS will only give you a valid fix in PSM or eDRX, the sample will unfortunately not work as intended on your side. If you get a hold of a home registered SIM, it is likely that you get PSM.

Regarding the ERR printed as timestamp, I can confirm this bug is present.

Kind regards,

Håkon