Bluetooth: NUS shell transport
The Nordic UART Service (NUS) shell transport sample demonstrates how to use the Nordic UART Service (NUS) shell transport to receive shell commands from a remote device over Bluetooth®.
When the connection is established, you can connect to the sample through the Nordic UART Service (NUS) by using a host application. You can then send shell commands that are executed on the device running the sample, and see the logs. See Sending shell commands for more information about the host tools available in nRF Connect SDK for communicating with the sample.
The sample supports the following development kits:
When built for an
_ns build target, the sample is configured to compile and run as a non-secure application with Cortex-M Security Extensions enabled.
Therefore, it automatically includes Trusted Firmware-M that prepares the required peripherals and secure services to be available for the application.
You also need an additional nRF52 development kit, like the PCA10040 for connecting using the
Alternatively, you can use Bluetooth LE Console for connecting, using Linux only.
This sample can be found under
samples/bluetooth/shell_bt_nus in the nRF Connect SDK folder structure.
When built as firmware image for the
_ns build target, the sample has Cortex-M Security Extensions (CMSE) enabled and separates the firmware between Non-Secure Processing Environment (NSPE) and Secure Processing Environment (SPE).
Because of this, it automatically includes the Trusted Firmware-M (TF-M).
To read more about CMSE, see Processing environments.
To build the sample with Visual Studio Code, follow the steps listed on the How to build an application page in the nRF Connect for VS Code extension documentation. See Configuring and building an application for other building scenarios, Programming an application for programming steps, and Testing for general information about testing and debugging in the nRF Connect SDK.
The nRF Connect SDK provides two alternatives for testing the sample:
Testing using the shell_bt_nus script. It is a Python 3 script that requires a console application, like PuTTY, and a second development kit.
Testing using the Bluetooth LE Console. It is a stand-alone application for Linux.
The script file
scripts/shell/bt_nus_shell.py contains a cross-platform example host application, written in Python 3.
The script uses an additional Nordic development kit, like the PCA10040, as a Bluetooth central device.
It connects to the specified device and forwards all NUS traffic to the network port.
You can then use a console application, like PuTTY, to connect to that port and use the shell.
The default port is set to
After programming the sample to your development kits, complete the following steps to test it:
Start a console application, like PuTTY, and connect through UART to the
shell_bt_nusapplication running on the development kit to check the log. See Testing for more information on how to connect with PuTTY through UART.
Run the following command in the nRF Connect SDK root directory to install the script dependencies:
pip install --user -r scripts/shell/requirements.txt
Connect to your PC the nRF52 development kit meant to use the
bt_nus_shell.pyscript with the correct parameters, for example:
bt_nus_shell.py --name BT_NUS_shell --com COM237 --family NRF52 --snr 682560213
Open a console application, like PuTTY, and open a new session, setting the Connection Type to Raw and the Destination Address to
Press Enter in the terminal window. A console prompt is displayed showing a log message that indicates the active connection.
Enter the commands that you want to execute.
See Bluetooth LE Console for more information on how to test the sample using the Bluetooth LE Console.
This sample uses the following nRF Connect SDK libraries:
In addition, it uses the following Zephyr libraries:
The sample also uses the following secure firmware component: