BLE multi_connection Example

Source code path: example/ble/multi_connection

Supported Platforms

All platforms

This example demonstrates BLE multi-connection functionality based on GAP central and peripheral roles and GATT server on this platform.

When operating as a slave device, the board automatically starts advertising upon boot and can be connected via BLE apps on mobile phones.
After connection, the board automatically restarts advertising and can accept connections from other mobile devices.
It can also operate as a master device, searching for and connecting to other slave devices through finsh commands.

Before running this example, prepare:

Enable Bluetooth (BLUETOOTH):
- Path: Sifli middleware → Bluetooth
- Enable: Enable bluetooth
  - Macro switch: CONFIG_BLUETOOTH
  - Description: Enables Bluetooth functionality
Enable GAP, GATT Client, BLE connection manager:
- Path: Sifli middleware → Bluetooth → Bluetooth service → BLE service
- Enable: Enable BLE GAP central role
  - Macro switch: CONFIG_BLE_GAP_CENTRAL
  - Description: Switch for BLE CENTRAL (central device). When enabled, it provides scanning and active connection initiation with peripherals.
- Enable: Enable BLE GATT client
  - Macro switch: CONFIG_BLE_GATT_CLIENT
  - Description: Switch for GATT CLIENT. When enabled, it can actively search and discover services, read/write data, and receive notifications.
- Enable: Enable BLE connection manager
  - Macro switch: CONFIG_BSP_BLE_CONNECTION_MANAGER
  - Description: Provides BLE connection control management, including multi-connection management, BLE pairing, link connection parameter updates, etc.
Enable NVDS:
- Path: Sifli middleware → Bluetooth → Bluetooth service → Common service
- Enable: Enable NVDS synchronous
  - Macro switch: CONFIG_BSP_BLE_NVDS_SYNC
  - Description: Bluetooth NVDS synchronization. When Bluetooth is configured to HCPU, BLE NVDS can be accessed synchronously, so enable this option; when Bluetooth is configured to LCPU, this option needs to be disabled.

Switch to the example project/common directory and run the scons command to compile:

> scons --board=eh-lb525 -j8

Switch to the example project/common/build_xx directory and run uart_download.bat, then select the port as prompted to download:

$ ./uart_download.bat

     Uart Download

please input the serial port num:5

For detailed compilation and download steps, please refer to the Quick Start Guide.

After the example starts:

It can be discovered and connected by multiple different mobile phones via BLE apps, allowing corresponding GATT characteristic value read/write operations.
It can actively connect to other devices