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doc: samples: Update bluetooth/central README

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Add relevant details to README file of samples/bluetooth/central

Signed-off-by: Manojkumar Konisetty <manoj@aerlync.com>
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Manojkumar Konisetty 2025-04-02 12:48:20 +05:30 • committed by Benjamin Cabé
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samples/bluetooth/central/README.rst
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@ -2,14 +2,41 @@
:name: Central :name: Central
:relevant-api: bluetooth :relevant-api: bluetooth
Implement basic Bluetooth LE Central role functionality (scanning and connecting). Implement basic Bluetooth LE Central role functionality
(scanning and connecting).
Overview Overview
******** ********
Application demonstrating very basic Bluetooth LE Central role functionality by scanning This application demonstrates basic Bluetooth LE Central role functionality
for other Bluetooth LE devices and establishing a connection to the first one with a by scanning for other Bluetooth LE devices and establishing a connection
strong enough signal. to the first one with a strong enough signal.
Core features
*************
Scanning for devices
====================
The application initiates a passive scan to detect nearby Bluetooth LE devices.
It specifically looks for devices that have a signal strength greater
than -50dBm. This threshold helps the app filter out weaker signals,
ensuring it only interacts with devices that are within a reasonable RSSI
range for communication.
Connection handling
===================
1. The Central scans for Peripheral devices and if it finds a Peripheral
which has a signal strength higher than -50dBm, an attempt to establish
LE connection is made.
2. If the connection is successful, the Central initiates disconnect to
the Peripheral and then restarts the scan.
3. If there are no connections, the Central keeps scanning continuously.
The sample is used to demonstrate the Central mode capabilities of Bluetooth LE and
hence a disconnect is issued right immediately after establishing a connection with
a Peripheral, allowing the Central to resume scanning for other devices.
Requirements Requirements
************ ************
@ -17,9 +44,18 @@ Requirements
* BlueZ running on the host, or * BlueZ running on the host, or
* A board with Bluetooth LE support * A board with Bluetooth LE support
Building and Running Building and running
******************** ********************
This sample can be found under :zephyr_file:`samples/bluetooth/central` in the
Zephyr tree.
See :zephyr:code-sample-category:`bluetooth` samples for details. Build and flash the sample as follows, replacing board_name with your
target board:
.. zephyr-app-commands::
:zephyr-app: samples/bluetooth/central
:board: board_name
:goals: build flash
:compact:
To test Central's scanning functionality, either flash the :zephyr:code-sample:`ble_peripheral`
sample on a second compatible board or use an off-the-shelf Bluetooth LE enabled
device that can act as a Peripheral (eg. smartphone, smartwatch, etc.).