AT Commands from Application Space

[joebambino]

I have my first custom nRF9160 prototype boards back and they seem to be working pretty well.

One question I do have is that I have been unable to find a clear concise description of how to send an AT command from within main.c in the application space.  I am using the AT_CLIENT sample, and I have it running and responding from both the LTE Link Monitor and from my terminal (I am on a Mac using OSX). All I want to do is make sure that the modem is turned on and active.  I’m never sure if the modem is turned on by default in the AT_CLIENT sample or if  when using nRF LTE Link Monitor, by reading CFUN (AT+CFUN?) it is actually turning the modem on. In order to turn the modem on from main.c is it as simple as setting:


CONFIG_AT_CMD=y
CONFIG_AT_NOTIF=y

in proj.conf  and then invoking

#include <modem/at_cmd.h>
#include <modem/at_notif.h>

at_cmd_write("AT+CFUN=21", NULL, 0, NULL)

in main.c?

I've looked through many posts in the forums and the online documentation but haven't found anything this fundamentally basic.

Thanks!

[Albrecht Markus Schellenberger]

Hello Joe,

In general, the modem will start automatically if the modem library is initialised.

To able to use the function at_cmd_write, the AT command interface library must be initialised first.

The AT Client sample uses the AT Host library which includes the above-mentioned steps.

So yes, if you are going to use the AT Host together with your application it is as simple as you described.

I hope this will help you!

Regards,

Markus