The latest development version of this page may be more current than this released 2.3-beta.1 version.

central_multilink

Overview

This example demonstrates the functionality of BLE as a central device to connect to multiple peripheral devices. After the example is run, the scanning function is activated. If the signal strength of a scanned peripheral device is greater than -70dBm, a connection attempt is initiated. Once the connection is successful, scanning continues and another connection request is made. This process repeats until the number of connected peripheral devices reaches CONFIG_BT_MAX_CONN , at which point the connections are sequentially disconnected. The operations are then repeated, and the program exits after the number of repetitions reaches CONFIG_SAMPLE_CONN_ITERATIONS .

CONFIG_BT_MAX_CONN configures the maximum number of peripheral devices that can be connected simultaneously. The setting path is menuconfig -> Components configuration -> Bluetooth -> Maximum number of simultaneous connections
CONFIG_SAMPLE_CONN_ITERATIONS configures the number of iterations for repeated connections. The setting path is menuconfig -> Connection iterations

Requirements

A board with BLE support
Multiple devices running BLE peripheral functionality

Building and Running

Example Location：examples/bluetooth/central_multilink

compile, burn, and more, see：Quick Start Guide

Running Result

Successfully running will output the following logs

I/bt_hci_core     [0.078] Identity: 28:6D:CE:01:02:03 (public)
I/bt_hci_core     [0.084] HCI: version 4.2 (0x08) revision 0x0709, manufacturer 0x070c
I/bt_hci_core     [0.092] LMP: version 4.2 (0x08) subver 0x0709
I/multilink       [0.098] Bluetooth initialized, CONFIG_BT_MAX_CONN is 3 , loop is 10
I/multilink       [0.108] Scanning successfully started