LTE9160_AT_For_NB_CAT_source_hex
For nRF9160 AT commands

This document describes the AT commands used to control the modem in nRF91 Series devices. 
The nRF91 series AT command API enables modem control for firmware running in the application core on nRF91 series devices.

The AT command API can also be exposed on one of the nRF91 serial interfaces by programming appropriate firmware in the application core. 
The nRF Connect SDK contains examples of such proxy firmware that can be run stand-alone or as part of other firmware functionality in the nRF91 application core. 
The stand-alone example is called at_client. 
This way, an external MCU or computer can get access to the modem API either exclusively or in addition to application firmware running on the nRF91 itself.

Document:
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fref_at_commands%2FREF%2Fat_commands%2Fintro.html&cp=2_1
Source code: