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Bluetooth Low Energy: Peripheral

Overview

The BLE Peripheral sample demonstrates the BLE Peripheral role. It has several well-known and vendor-specific GATT services that it exposes.

Requirements

Before you start, check that you have the required hardware and software:

Building the sample

Before you start building, remember to set up the environment first.

Use the following steps to build the BLE Peripheral sample on the command line.

  1. Open a terminal window.

  2. Go to my-workspace/ncs-playground directory created in the Setting up the environment section.

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    cd my-workspace/ncs-playground

  3. Build the sample using the west command, specifying the board (following the -b option) as dongle_nrf52840:

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    west build -p always -b dongle_nrf52840 samples/ble/peripheral

    Tip

    The -p always option forces a pristine build, and is recommended for new users. Users may also use the -p auto option, which will use heuristics to determine if a pristine build is required, such as when building another sample.

  4. After running the west build command, the build files can be found in build/zephyr.

Flashing the firmware

The sample is designed to work with the UF2 Bootloader, so that you can easily flash the sample using the UF2 Bootloader. The firmware can be found in build/zephyr with the name zephyr.uf2.

To flash the firmware, complete the following steps:

  1. Push and hold the button and plug your dongle into the USB port of your computer. Release the button after your dongle is connected. The RGB LED turns green.

  2. It will mount as a Mass Storage Device called UF2BOOT.

  3. Drag and drop zephyr.uf2 onto the UF2BOOT volume. The RGB LED blinks red fast during flashing.

  4. Re-plug the dongle and the sample will start running.

Testing

After flashing the firmware to your dongle, complete the following steps to test it:

  1. Plug the dongle into the USB port of your computer.
  2. Start the nRF Connect for Mobile app, scan the device and observe that the device is advertising with the Device Name Zephyr Peripheral Sample Long Name.

  3. Connect to the device from the nRF Connect for Mobile app. The services of the connected device are shown in the Client tab.