Wi-Fi: Bluetooth LE based provision

This sample demonstrates how to provision a Wi-Fi® device over a Bluetooth® Low Energy link.

Requirements

The sample supports the following development kits:

Hardware platforms	PCA	Board name	Board target	Shields
Thingy:53	PCA20053	thingy53	thingy53/nrf5340/cpuapp	nrf7002eb
nRF7002 DK (emulating nRF7001)	PCA10143	nrf7002dk	nrf7002dk/nrf5340/cpuapp/nrf7001
nRF7002 DK	PCA10143	nrf7002dk	nrf7002dk/nrf5340/cpuapp
nRF5340 DK	PCA10095	nrf5340dk	nrf5340dk/nrf5340/cpuapp	nrf7002ek_nrf7001 nrf7002ek

The sample requires a smartphone (configurator) with Nordic Semiconductor’s nRF Wi-Fi Provisioner app installed in one of the following versions:

• nRF Wi-Fi Provisioner mobile app for Android

  • Source code for nRF Wi-Fi Provisioner mobile app for Android

• nRF Wi-Fi Provisioner mobile app for iOS

  • Source code for nRF Wi-Fi Provisioner mobile app for iOS

Overview

With this sample, you can provision a Wi-Fi device that lacks input or output capability, using the Wi-Fi Provisioning Service library. The sample is divided into three parts:

• Task and event handling component: Handles provisioning-related tasks and events.

• Transport layer: Based on Bluetooth Low Energy and exchanges information between the device and the nRF Wi-Fi Provisioner app.

• Configuration management component: Manages the provisioning data (in RAM and flash) accessed by multiple threads.

Configuration

See Configuring and building for information about how to permanently or temporarily change the configuration.

Configuration options

The following sample-specific Kconfig options are used in this sample (located in samples/wifi/provisioning/ble/Kconfig):

CONFIG_WIFI_PROV_ADV_DATA_UPDATE

This option enables periodic updates of advertisement data.

CONFIG_WIFI_PROV_ADV_DATA_UPDATE_INTERVAL

This option specifies the update interval of the advertisement data.

To get live update of the Wi-Fi status without setting up a Bluetooth connection, enable the CONFIG_WIFI_PROV_ADV_DATA_UPDATE Kconfig option. Set the CONFIG_WIFI_PROV_ADV_DATA_UPDATE_INTERVAL Kconfig option, to control the update interval.

Features

The sample implements advertising over Bluetooth LE.

After powerup, the device checks whether it is provisioned. If it is, it loads saved credentials and tries to connect to the specified access point.

The device advertises over Bluetooth LE.

The advertising data contains several fields to facilitate provisioning. It contains the UUID of the Wi-Fi Provisioning Service and four bytes of service data, as described in the following table.

Byte 1	Byte 2	Byte 3	Byte 4
Version	Flag(LSB)	Flag(MSB)	RSSI

• Version: 8-bit unsigned integer. The value is the version of the Wi-Fi Provisioning Service sample.

• Flag: 16-bit little endian field. Byte 2 (first byte on air) is LSB, and Byte 3 (second byte on air) is MSB.

  • Bit 0: Provisioning status. The value is 1 if the device is provisioned, otherwise it is 0.

  • Bit 1: Connection status. The value is 1 if Wi-Fi is connected, otherwise it is 0.

  • Bit 2 - 15: RFU

• RSSI: 8-bit signed integer. The value is the signal strength. It is valid only if the Wi-Fi is connected.

The advertising interval depends on the provisioning status. If the device is not provisioned, the interval is 100 ms. If it is provisioned, the interval is one second.

Building and running

This sample can be found under samples/wifi/provisioning/ble in the nRF Connect SDK folder structure.

To build the sample, follow the instructions in Building an application for your preferred building environment. See also Programming an application for programming steps and Testing and optimization for general information about testing and debugging in the nRF Connect SDK.

Note

When building repository applications in the SDK repositories, building with sysbuild is enabled by default. If you work with out-of-tree freestanding applications, you need to manually pass the --sysbuild parameter to every build command or configure west to always use it.

The sample generates header and source files based on protocol buffer definitions in .proto files during the build process. You must install a protocol buffer compiler to generate the files. See the Nanopb in the Zephyr documentation for more information.

Testing

After programming the sample to your development kit, complete the following steps to test it:

1. Connect the kit to the computer using a USB cable. The kit is assigned a COM port (Windows) or ttyACM device (Linux), which is visible in the Device Manager.

2. Connect to the kit with a terminal emulator (for example, nRF Connect Serial Terminal). See Testing and optimization for the required settings and steps.

3. Observe the following output:

   wifi_prov: BT Advertising successfully started
   

4. Open the nRF Wi-Fi Provisioner app.

5. Enable Bluetooth if it is disabled.

6. Search and connect to the device you want to provision. If the connection and pairing are established, observe the following output:

   wifi_prov: BT Connected: <configurator BT address>
   wifi_prov: BT pairing completed: <configurator BT address>, bonded: 0
   

7. Start an access point scan.

8. Enter the password, if required.

9. Establish a Wi-Fi connection.

10. Observe the following output, if the connection is successful:

    wpa_supp: wlan0: CTRL-EVENT-CONNECTED - Connection to <AP MAC Address> completed [id=0 id_str=]
    

Dependencies

This sample uses the following nRF Connect SDK libraries:

• Wi-Fi Provisioning Service

• Wi-Fi credentials

This sample also uses a module that can be found in the following location in the nRF Connect SDK folder structure:

• modules/lib/nanopb

In addition, it uses the following Zephyr libraries:

• API:

  • include/bluetooth/bluetooth.h

  • include/bluetooth/conn.h

  • include/bluetooth/uuid.h

  • include/bluetooth/gatt.h

  • include/net/wifi.h

  • include/net/wifi_mgmt.h