AT Client Shell sample

The Serial Modem AT Client Shell sample demonstrates how to send AT commands to the modem through the Serial Modem application running on an nRF91 Series SiP. This sample enables an external MCU to send modem and Serial Modem proprietary AT commands for LTE connection and IP services. See more information on the functionality of this sample from the Serial Modem AT Client library, which provides the core functionality for this sample.

Requirements

The Serial Modem application should be configured with app/overlay-external-mcu.overlay on the nRF91 Series DK side.

The sample supports the following development kit:

Hardware platforms	PCA	Board name	Board target
nRF54L15 DK	PCA10156	nrf54l15dk	nrf54l15dk/nrf54l15/cpuapp

Connect the DK pins that are defined in the board-specific overlay files samples/sm_at_client_shell/boards/*.overlay to the corresponding pins in the nRF91 Series DK, which are defined in app/overlay-external-mcu.overlay.

The following table shows how to connect UART, DTR and RI pins of the DK to the corresponding pins in the nRF91 Series DKs:

nRF54L15 DK	nRF91 Series DK
UART TX P0.00	UART RX P0.03
UART RX P0.01	UART TX P0.02
UART CTS P0.03	UART RTS P0.06
UART RTS P0.02	UART CTS P0.07
DTR OUT P1.11	DTR IN P0.31
RI IN P1.12	RI OUT P0.30
GPIO GND	GPIO GND

Note

You must disable the VCOM0 on the nRF54L15 DK to release the UART GPIO pins to use it with the AT Client Shell sample.

• For nRF54L15 DK, you can use the Board Configurator app to disable the Connect port VCOM0 setting.

Note

The GPIO output levels on the nRF91 Series device and nRF54L15 DK must be the same.

• You can set the VDD voltages for both devices with the Board Configurator app.

References

• nRF91x1 AT Commands Reference Guide

• Serial Modem AT commands

Dependencies

This sample uses the following nRF Connect SDK libraries:

• Serial Modem AT Client library