To control the nRF9151 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.
nRF Connect SDK includes AT Client's source code. The compiled AT Client firmware is available for the nRF9151 Development Kit (DK) at nRF9151 Downloads. For more information on AT Client, see Cellular: AT Client.
Available AT commands can be found in nRF91x1 Cellular AT Commands. Available AT commands supported by the Production Test Image (PTI) can be found in nRF91x1 Production Test AT Commands. For DECT NR+ specific AT commands, see nRF91x1 DECT NR+ AT Commands.