Reset Modem

RE: Reset Modem

Martin Lesund — Mon, 26 Aug 2019 13:53:36 GMT

Hi Manuel,

Could you share your .config file in the zephyr build folder?

Could you share any log output from your testing?

Could you share a code snippet when you call the function sys_reboot(SYS_REBOOT_COLD);?

RE: Reset Modem

mschweig — Mon, 26 Aug 2019 12:31:37 GMT

Hi Martin,

I tried to implement the same functionality, but the system reboot is not carried out.

I wanted to let the system reboot when a timer interrupt is called.

The timer interrupt is triggered and I set CONFIG_REBOOT=y in prj.conf

But the system is not rebooting it does nothing anymore after sys_reboot();

Can you help me?

Kind regards.

RE: Reset Modem

Martin Lesund — Fri, 14 Jun 2019 09:26:59 GMT

Hi Thomas,

If you turn off the modem (CFUN=0) there is no other way to turn it on other than to do a power cycle.
You can do this from the application by enabling it from the prj.conf file (or menuconfig ):

CONFIG_REBOOT=y

and add #include <misc/reboot.h> in your application where you can call the function:

sys_reboot(SYS_REBOOT_COLD);

This will reboot your device and also the modem.

note: Add a delay after the AT+CFUN=0 so the modem can do a graceful shutdown from the network and store data in the modem flash.

RE: Reset Modem

Thomas — Fri, 14 Jun 2019 01:07:47 GMT

You are right, CFUN=4 does not save it to the NVM and from what I've gathered only CFUN=0 does so. So Martin Lesund, do you know if there is a way to reset the modem without resetting the application as well?

RE: Reset Modem

jbrzozoski — Thu, 13 Jun 2019 18:01:26 GMT

lte_lc_offline only does "AT+CFUN=4". I didn't think that would save modem configuration to NVM like "AT+CFUN=0". Was I wrong?

RE: Reset Modem

Martin Lesund — Thu, 13 Jun 2019 13:47:26 GMT

Hi Thomas,

If you are using the lte_link_control driver you can just call the lte_lc_offline() function in the application to turn off the modem and then lte_lc_init_and_connect() re-initialize the modem.

RE: Reset Modem

Thomas — Thu, 13 Jun 2019 03:01:20 GMT

From some experimentation, I found that resetting the application in the firmware resets the modem as well.

Could anyone at Nordic comment if the modem can be reset separately to the application?