RE: Merging application mqtt_simple and gps

leo.lau — Wed, 23 Jun 2021 06:53:17 GMT

Hi,

Thank you for your suggestion. I have finally make my project works.

Thank you very much.

Best Regards,

Leo

RE: Merging application mqtt_simple and gps

Albrecht Markus Schellenberger — Wed, 16 Jun 2021 13:06:13 GMT

Hello Leo,

[quote user=""]How do I know if the modem enters PSM/eDRX mode?[/quote]

You can use the %XMODEMSLEEP and %XT3412 notifications to check the PSM status of the modem. Within your application, you can use the at_cmd_handler to process these notifications. But when it comes to co-existence of LTE and GPS, I’m not sure if you need to know the PSM status of the modem. It will basically take care of that by itself.

[quote user=""]2. is lte_lc_psm_req(true) using the parameter set from Kconfig?[/quote]

Yes.

[quote user=""]But how do I know how long the time is needed to transmit one packet?[/quote]

Normally, the modem will prioritise the LTE stack. Sending data every 2 seconds might result in that the GPS stack does not get the possibility to run “long enough” for getting a fix. My recommendation is to make usage of PSM/eDRX accordingly to avoid this problem.

I hope my answers will help you!

Regards,

Markus