Switching between GPS and LTE

RE: Switching between GPS and LTE

Chetan Kale — Tue, 07 Sep 2021 15:43:35 GMT

Hi Tron,

Can you please post the flow that how you managed switching to GPS after LTE or vice versa. Because I am also facing the same issue.

Thanks in advance!

Regards,

Chetan

RE: Switching between GPS and LTE

Håkon Alseth — Mon, 17 Jun 2019 10:19:24 GMT

It has its use-cases, but generally you are correct. For instance: AT+CFUN=0 should be used if you want to save your settings to persistent storage.

Kind regards,

Håkon

RE: Switching between GPS and LTE

Tron — Mon, 17 Jun 2019 09:41:54 GMT

After testing, setting CFUN to 4 seems to work.Further testing seems to indicate that AT+CFUN=0 never should b used, is this correct?

RE: Switching between GPS and LTE

Håkon Alseth — Mon, 17 Jun 2019 07:49:53 GMT

Hi,

Could you ensure that you are not turning off the modem via CFUN=0, as explained here? https://devzone.nordicsemi.com/f/nordic-q-a/48077/gps-http-post/190727#190727

You should use =4 instead.

Kind regards,

Håkon

RE: Switching between GPS and LTE

Hoang — Mon, 17 Jun 2019 06:57:43 GMT

Sorry, I didn't read carefully. Your case is so interesting, I will try it 🙂

RE: Switching between GPS and LTE

Tron — Mon, 17 Jun 2019 06:57:02 GMT

Are you basically saying that I have to reboot the device in order to send in the position?

RE: Switching between GPS and LTE

Tron — Mon, 17 Jun 2019 06:45:52 GMT

If you read my post carefully, you would see that this is exactly what I'm doing. I acquire the position, then i try to switch modes, and then do a LTE connect and transmit the data. I'm not trying to keep the GPS on while sending, I'm aware of this limitation in the 0.7.0-29-alpha release.

RE: Switching between GPS and LTE

Hoang — Mon, 17 Jun 2019 06:40:35 GMT

Hi @Tron

I think this is the answer for your problem:

"The current modem firmware, v0.7.0-29-alpha, allows you to choose the system mode via command %XSYSTEMMODE, but it does not support them concurrently, meaning that you cannot have GPS + NB-IoT, or GPS + CAT M1, enabled simultaneously at this time." Håkon Alseth

https://devzone.nordicsemi.com/f/nordic-q-a/48077/gps-http-post

🙂

hng