BLE - BLE UART Client

Introduction

In this example, two RTL8722 boards are connected using BLE. One board runs a BLE UART service, while the other connects to the service using a client and both boards are able to communicate with text messages over the UART service.

Procedure

On the first board, upload the BLE UART service example code. Refer to the example guide for detailed instructions.

For the second board, open the example, “Files” -> “Examples” -> “AmebaBLE” -> “BLEUartClient”.

Upload the code and press the reset button on Ameba once the upload is finished.
Reset the UART service board first, wait for the BLE advertisement process to begin, and reset the UART client board. The client board should scan, discover, and connect to the service board. After connecting, the client board will verify that the correct UART service exists on the service board, before enabling notifications on the TX characteristic. Any message typed in the serial terminal will be sent to the other board using the UART service.

Code Reference

The BLEClient class is used to discover the services that exist on a connected BLE device. The discovery process will create BLERemoteService, BLERemoteCharacteristic and BLERemoteDescriptor objects corresponding to the services, characteristics and descriptors that exist on the connected device. These objects can then be used to read and write data to the connected device.