question on serial_lte_modem sample

[Siyou]

Hi 

I am evaluating the serial_lte_modem sample with pc as client but failed, could you share the cmd format for gps start function?

here is the log after I issued the xgpsrun cmd as: 

AT#XGPSRUN=1

*** Booting Zephyr OS build v2.0.99-ncs1-rc1-1162-g9a0a85cf6760  ***
[00:00:01.548,095] <inf> app: Serial LTE Modem
[00:00:06.143,280] <err> gps: Failed to set fix retry value (err: -14)
[00:00:06.143,280] <err> gps: GPS start failed: -1

[Heidi]

Hi!

You're getting errno = -14  which corresponds to EFAULT: Bad address. However, I'm not sure why, so I have contacted the person who made the sample. 

Best regards,

Heidi

[Siyou]

Hi Heidi,

Sorry, one more question to this sample:
In our test, I found the SYSTEMMODE was 0,0,1,0 after the initialization finished, even without issue the cmd "AT%XSYSTEMMODE=0,0,1,0"
Moreover, I issued AT%XSYSTEMMODE=0,0,0,0, then reboot nrf9160 and check the SYSTEMMODE still was 0,0,1,0.
I want to know when and where to set the SYSTEMMODE to 0,0,1,0 during the sample initialization, and how to disable it?

Thanks!

[Heidi]

Hi, you can only set SYSTEMMODE when the modem is in offline mode, so run AT+CFUN=4 before setting the system mode. 

[Siyou]

Hi Heidi,

Yes I knew the SYSTEMMODE can be modified when CFUN=0 or CFUN=4.
My question is why the SYSTEMMODE default value is 0,0,1,0 but not 0,0,0,0 in serial_lte_modem sample, and how to change its default value to 0,0,0,0 without issue AT cmd?

Thanks.

[Heidi]

If you run AT+CFUN=0 after changing the %XSYSTEMMODE configurations, the modem will store them to flash and they will become the initial system mode after every subsequent boot. 

[Siyou]

Hi Heidi,

Understand, thank you for your support.