BLE central and peripheral Example

Source code path: example/ble/central_and_peripheral

Supported Platforms

All platforms

This example demonstrates how to simultaneously implement GAP central and peripheral roles as well as GATT client and server on this platform.

The finsh commands for this example can be printed by entering “diss help” to show commands and usage methods.
When operating as a slave device, the board starts advertising upon boot with the name SIFLI_APP-xx-xx-xx-xx-xx-xx, where xx represents the Bluetooth address of the device. It can be connected via BLE apps on mobile phones.
When operating as a master device, you can search for other slave devices and initiate connections through finsh commands.
When operating as a GATT server, write and read operations can be performed from the mobile client, or by enabling CCCD, the device will update the characteristic value every second.
When operating as a GATT client, you can search and display the server’s database through finsh commands, and perform read or write operations on characteristic values.

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, 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, allows active service discovery, data reading/writing, and notification reception.
- Enable: Enable BLE connection manager
  - Macro switch: CONFIG_BSP_BLE_CONNECTION_MANAGER
  - Description: Provides BLE connection control management, including multi-connection management, BLE pairing, and link connection parameter updates.
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 -j32

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 mobile BLE apps, allowing corresponding GATT characteristic value read/write operations.
It can search for other BLE devices, connect to them and search the connected device’s GATT database, while performing GATT read/write operations.