C++ library for BluetoothLE usage on MacOS or (soon) Windows.

feeling-blue was created because of a lack of resources for the non-expert on how to connect to a bluetooth device using C++. The API was carefully designed to be easy-to-use, yet feature-rich so you can take advantage of your bluetooth peripherals without learning the nuisances of bluetoothLE.

Full documentation here

Table of Contents

• Features
• Installation
• Usage
• Upcoming Features
• Help & bug reports
• Contributing

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Features

• Blocking & non-blocking API. Calls to find services, characteristics, etc block the calling thread until the process is complete.
• Supports connecting to multiple bluetooth devices.
• User-defined event handlers for device notifications.
• Simple and straightfoward API.

Installation

Download and build

$ git clone https://github.com/seanngpack/feeling-blue-cpp
$ cd feeling-blue-cpp
$ mkdir build
$ cd build
$ cmake .. // use -DVERBOSE_MODE=OFF to turn off all console logging from feeling-blue
$ sudo make install

Add library to your project, you just need to add find_package() and target_link_libraries().

• Example of cmakelists.txt in your project:

cmake_minimum_required(VERSION 3.17)
project(yourProject)

set(CMAKE_CXX_STANDARD 17)

find_package(feeling-blue REQUIRED)

add_executable(yourProject main.cpp)
target_link_libraries(yourProject PUBLIC feeling-blue)

Time to start using it!

Below is a brief example that finds a device and reads, writes, and sets notifications to it.

main.cpp

void print_temp(std::vector<std::byte> data) {
    std::cout << "the size of the data is: " << data.size() << std::endl;
    for (auto const &b : data) {
        std::cout << (int)b << std::endl;
    }
    std::cout << "the current temperature is: " << bytes_to_int(data) << "degrees" << std::endl;
}

#include "feeling-blue/feeling-blue.h"

int main() {
    std::unique_ptr<bluetooth::Central> central = std::make_unique<bluetooth::Central>();
    central->start_bluetooth();
    std::shared_ptr<bluetooth::Peripheral> temperature_device = central->find_peripheral("NameOfYourDevice");
    std::shared_ptr<bluetooth::Service> service = temperature_device->find_service("someUUID");
    std::shared_ptr<bluetooth::Characteristic> current_temp_char = service->find_characteristic("someUUID");
    std::shared_ptr<bluetooth::Characteristic> units_char = service->find_characteristic("someUUID");

    current_temp_char->set_notify(print_temp); // will call print_temp() whenever device notifies
    
    std::string units = units_char->read<std::string>();
    std::cout << "the current temperature unit is: " << units << std::endl
    units_char->write_without_response<std::string>("kelvin"); // set new temperature unit to device
    units = units_char->read<std::string>();
    std::cout << "the new temperature unit is: " << units << std::endl

    while (true) {
        ...
    }
  
    return 0;
}

Go to the documentation for more comprehensive examples!

Upcoming features:

• methods to get status of peripherals, characteristics, etc
• Windows support

Help & bug reports

Just open a new issue!

Contributing

1. Fork the repo
2. Clone your fork somewhere on your computer git clone https://github.com/<your-username>/pcl.git
3. cd feeling-blue-cpp
4. add upstream to original repo git remote add upstream https://github.com/seanngpack/feeling-blue-cpp.git
5. implement your new changes on your fork
6. pull from upstream master to make sure you are up to date with the newest release of feeling-blue-cpp
7. open pull request