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BLE tree network

Introduction

This project allows the built-in BLE module and one plugged-in BLE module to cooperate on Raspberry Pi 3 model B. With this project and two BLE modules, multiple Pi 3s can form a BLE tree network. There are four main processes in this project: Master Agent (gatttool.c), Slave Agent (main_v2.js & characteristic_v2.js), Scan Center (server_scan.py) and Sensor Center (sensorCenter.cpp).

Prerequisites

Install bleno first. Note that bluetoothd should be disabled as the document of bleno describes.

Build

  1. Clone this repository under the directory /home/pi/Documents.
  2. Clone bleno repository under this directory (/home/pi/Documents/BLE).
  3. Change the directory.
cd ./centers
  1. Compile and build sensorCenter.
make
  1. Change the directory.
cd ../bluez-5.43/attrib
  1. Compile and build gatttool.
make
  1. Finally, go back to the home directory of this repository.
cd ../../

Run

Maintain the setting file

Before running the project, a setting file should be named info.txt and put in /home/pi/Documents. Proper setting file can be referred to info_example.txt.

Reset

Before running the project, the plugged-in BLE module must be reset every time after the Pi 3 is turned on. Use:

sudo bash centers/reset.sh

If the terminal shows

bleno - echo
on -> stateChange: poweredOn
on -> advertisingStart: success

then the process of reseting is complete.

Press Ctrl + c to exit.

Run

Use:

sudo bash run_v2.sh

Stop

To stop the project, press Ctrl + c first to stop the foreground process first and type

sudo bash stop.sh

in terminal.

User Device

To allow a user device to interact with the BLE network, please download the Android Studio project and build it on a Android phone. After the app is built, simply execute it and the device will be connected to the BLE network automatically.