bluetooth-classic

This is a library which provides multi-platform support to handle Bluetooth Classic functionality. Since this is an alpha release, expect the API to change at any time.

Currently, support is present for the following platforms:

• Linux
• Windows
• MacOS

Funding

This project is funded through NGI Zero Core, a fund established by NLnet with financial support from the European Commission's Next Generation Internet program. Learn more at the NLnet project page.

Dependencies

• Linux

  • Bluez
  • DBus
  • NetworkManager (optional, required for PANU)
  • ModemManager (optional, required for DUN)
  • PulseAudio (optional, required to manage device audio profiles)

• Windows/MacOS

  • haraltd
  • Start the server before using this library (i.e using the server start command)

Feature matrix

Features (APIs) / OS	Pairing	Connection (Automatic/Profile-based)	Send/Receive Files (OBEX Object PUSH)	Network Tethering (PANU/DUN)	Media Control (AVRCP)
Linux	✔️	✔️ (Yes/Yes)	✔️	✔️	✔️
Windows	✔️	✔️ (Yes/Yes)	✔️	Not yet implemented	Not yet implemented
MacOS	✔️	✔️ (Yes/No)	✔️	Not yet implemented	Not yet implemented
FreeBSD	Not yet implemented	Not yet implemented	Not yet implemented	Not yet implemented	Not yet implemented

Documentation

The documentation is not very extensive right now, more documentation will be added later. See the package reference for more information.

Sample Usage

package main

import (
	"fmt"

	"github.com/bluetuith-org/bluetooth-classic/api/bluetooth"
	"github.com/bluetuith-org/bluetooth-classic/api/config"
	"github.com/bluetuith-org/bluetooth-classic/session"
	"github.com/google/uuid"
)

func main() {
    // Initialize a session configuration.
	cfg := config.New()

    // Create a new session.
	session := session.NewSession()

    // Attempt to start the session, and if it returns with no errors,
    // it will provide the supported features and platform information of the session.
    // The autHandler struct handles all authentication requests, like for pairing or file transfer.
	featureSet, pinfo, err := session.Start(&authHandler{}, cfg)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer session.Stop()

    // Listen for any device events when devices are added to or removed from the system or its properties are updated.
	go func() {
		id := bluetooth.DeviceEvent().Subscribe()
		if !id.Subscribable {
			return
		}

		for device := range id.C {
			fmt.Println(device.Data)
		}
	}()

    // Listen for any adapter events when adapters are added to or removed from the system or its properties are updated.
    go func() {
		id := bluetooth.AdapterEvent().Subscribe()
		if !id.Subscribable {
			return
		}

		for adapter := range id.C {
			fmt.Println(adapter.Data)
		}
	}()

    // Print the platform information.
	fmt.Println(pinfo)

    // Print the supported features of the session.
	fmt.Println(featureSet.Supported.String())
    
    // Get a list of adapters.
    adapters := session.Adapters()
	for _, adapter := range adapters {
		fmt.Println(adapter.Name)
	}
	if len(adapters) == 0 {
		panic("no adapters found")
	}

    // Select an adapter from the list.
	selectedAdapter := session.Adapter(adapters[0].Address)

    // Start discovering devices on the selected adapter.
    // All discovered devices will be sent as device events.
	err = selectedAdapter.StartDiscovery()
	if err != nil {
		panic(err)
	}

	time.Sleep(10000)

    // Stop discovering devices on the selected adapter.
	err = selectedAdapter.StopDiscovery()
	if err != nil {
		panic(err)
	}
}

// authHandler provides a custom SessionAuthorizer based implementation to handle authentication requests,
// like for pairing or incoming file transfers. For each of the handler functions, return an error if
// the authentication request should be denied.
type authHandler struct {
}

func (a *authHandler) AuthorizeTransfer(timeout bluetooth.AuthTimeout, props bluetooth.ObjectPushData) error {
    fmt.Println(props)
	return nil
}

func (a *authHandler) DisplayPinCode(timeout bluetooth.AuthTimeout, address bluetooth.MacAddress, pincode string) error {
    return errors.New("do not authenticate")
}

func (a *authHandler) DisplayPasskey(timeout bluetooth.AuthTimeout, address bluetooth.MacAddress, passkey uint32, entered uint16) error {
    fmt.Println(passkey)
	return nil
}

func (a *authHandler) ConfirmPasskey(timeout bluetooth.AuthTimeout, address bluetooth.MacAddress, passkey uint32) error {
	fmt.Println(passkey)

	return nil
}

func (a *authHandler) AuthorizePairing(timeout bluetooth.AuthTimeout, address bluetooth.MacAddress) error {
	return nil
}

func (a *authHandler) AuthorizeService(timeout bluetooth.AuthTimeout, address bluetooth.MacAddress, uuid uuid.UUID) error {
	return nil
}