Hardware and firmware preparations are needed to communicate with nRF9160 in different
test cases.
Test interfaces
nRF9160 uses SWD and UART interfaces for device controls. They should be accessible to support testing functionalities.
Modem firmware
nRF9160 is preprogrammed with modem firmware. The preprogrammed firmware supports AT commands that are described in this document and needed for the most common test cases.
Setting up AT command interface
To control the nRF9160 LTE modem with AT commands, an application program that routes AT commands from the computer is needed. Nordic offers the AT Client application for this purpose. The AT Client firmware needs to be compiled according to the product hardware pin mapping.