Ambiguous new note for CFUN at command nrf9160

[Dion Dokter]

Hello,

a new modem-firmware (v1.3.4) for the nrf9160 has been released together with v2.2 of the AT commands. The CFUN command now has a new note: https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/mob_termination_ctrl_status/cfun_set.html

> The response for CFUN=40 is ERROR if the modem has been activated with CFUN=1 or CFUN=21.

This is pretty ambiguous though. This can mean three different things:

• Has the modem EVER been activated with 21?
• Has the modem been activated with 21 the LAST TIME?
• Has the modem been activated with 21 the last time AND is it still active?

Can it be clarified what this note actually means?

I've run into an issue with the rust wrapper library I made: https://github.com/diondokter/nrf-modem/issues/10

Of course if you know what the problem is described in the issue, it would be nice to get an answer on that too.

[Hakon]

Hello,

• Has the modem EVER been activated with 21?
• Has the modem been activated with 21 the LAST TIME?
• Has the modem been activated with 21 the last time AND is it still active?

I just tested this with at_client, and the last option seems to be correct. The modem needs to be inactive to deactivate the UICC.

[Dion Dokter]

Thanks for testing! This is what I expected and how I've coded it it