nrf_inbuilt_key_write returns 13 (EACCES) error code

[Aleksei Vegner]

Hi there!

I'm using nrf9160 DK's SiP to establish TLS connection to MQTT broker.

When I call nrf_inbuilt_key_write it returns 13 error code which means "If the operation could not be performed while modem is in active state."

What state should modem have to enable key's addition / update?

Is it related with modem's functional state?

0 – Power off
1 – Normal mode
4 – Offline mode
44 – Offline mode without shutting down UICC

If so which mode should I use to add keys? 4 or 44?

[Håkon Alseth]

Hi,

 

The modem should not be in normal mode in order to provision keys.

The easiest way to do this is to call the nrf_inbuilt API before you setup the link.

In your prj.conf, the LTE link control should be configured like this:

# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

Call the nrf_inbuilt functions, then you can then configure the link in your main file, similar to how the asset tracker does it:

https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/samples/nrf9160/asset_tracker/src/main.c#L731

 

Could you try this and see if that works better in your application?

Kind regards,

Håkon

[Aleksei Vegner]

Thank you, I've already figured out that nrf_inbuilt_* API should be called before lte lc init. Yes, it's the simplest way.