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A Bluetooth kotlin multiplatform "Cross-Platform" library for iOS and Android
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Blue Falcon Blue-Falcon

A Bluetooth "Cross Platform" Kotlin Multiplatform library for iOS and Android.

Bluetooth in general has the same functionality for all platforms, e.g. connect to device, fetch services, fetch characteristics.

This library is the glue that brings those together so that mobile developers can use one common api to perform the bluetooth actions.

The idea is to have a common api for using bluetooth as the principle of bluetooth is the same but each platform ios and android has different apis which means you have to duplicate the logic for each platform.

What this library isn't? It is not a cross platform library, this is a multiplatform library. The difference? each platform is compiled down to the native code, so when you use the library in iOS, you are consuming an obj-c library and same principle for Android.


An example using kotlin multiplatform.

Handle different scenarios for permissions e.g. bluetooth off, permission denied

Known issues:

On the android example we have an issue where the characteristic which was originally stored has changed and we are holding onto an old version.

Basic Usage


Create an instance of BlueFalcon and then call the scan method.

let blueFalcon = BlueFalcon()



implementation 'dev.bluefalcon:library-android:0.0.3'

The Android sdk requires an Application context, we do this by passing in on the BlueFalcon constructor, in this example we are calling the code from an activity(this).

try {
    val blueFalcon = BlueFalcon(this)
} catch (exception: PermissionException) {
    //request the ACCESS_COARSE_LOCATION permission

BlueFalcon API

The basic functionality of the api is listed below, this should be a simplistic as possible and is the same in any platform.

fun connect(bluetoothPeripheral: BluetoothPeripheral)
fun disconnect(bluetoothPeripheral: BluetoothPeripheral)
fun scan()
fun stopScanning()
fun readCharacteristic(
    bluetoothPeripheral: BluetoothPeripheral,
    bluetoothCharacteristic: BluetoothCharacteristic
fun notifyCharacteristic(
    bluetoothPeripheral: BluetoothPeripheral,
    bluetoothCharacteristic: BluetoothCharacteristic,
    notify: Boolean
fun writeCharacteristic(
    bluetoothPeripheral: BluetoothPeripheral,
    bluetoothCharacteristic: BluetoothCharacteristic,
    value: String

BlueFalcon Delegate Methods

In your platform layer, you need to implement a delegate to get notified when an event occurs, e.g. Device discovered.

fun didDiscoverDevice(bluetoothPeripheral: BluetoothPeripheral)
fun didConnect(bluetoothPeripheral: BluetoothPeripheral)
fun didDisconnect(bluetoothPeripheral: BluetoothPeripheral)
fun didDiscoverServices(bluetoothPeripheral: BluetoothPeripheral)
fun didDiscoverCharacteristics(bluetoothPeripheral: BluetoothPeripheral)
fun didCharacteristcValueChanged(bluetoothPeripheral: BluetoothPeripheral, bluetoothCharacteristic: BluetoothCharacteristic)


This repo contains examples for ios and android in the examples folder, install their dependencies, and run it locally:


To run the iOS example, simply perform a pod install and run from xcode.

pod install


Open the root directory of the project in Android Studio and run the Android app target from the ide.


For a bug, feature request, or cool idea, please file a Github issue.

Two big little things

Keep in mind that Blue-Falcon is maintained by volunteers. Please be patient if you don’t immediately get an answer to your question; we all have jobs, families, obligations, and lives beyond this project.

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