React Native Bluetooth Low Energy

Introduction

react-native-bluetooth-le library stands for implement commons bluetooth low energy specifications in react-native ecosystem.
It uses the new react-native turbo module architecture thats powers a better performance for react-native applications. Exposes a bluetooth javascript api with easy subscribe/unsubscribe pattern approach to handle bluetooth events and provides foreground mode transmission on android.

Compatibility

Must be a react-native 0.69 or above.
Must be hermes engine enabled. please checkout the link: https://reactnative.dev/docs/new-architecture-intro to enable.

• Android (Fully supported on sdk 28 or above).
• IOs (Not yet supported)

Getting started

Using yarn

  yarn add react-native-bluetooth-le;

Using npm

  npm install react-native-bluetooth-le;

Imperative API

All bluetooth operations are provided using a event driven and functional programming paradigm approach, in this paradigm we avoid persisting state and mutate it.

import {turnOnBluetoothIfPossible, turnOffBluetoothIfPossible, onDiscovery, onStateChange} from 'react-native-bluetooth-le';

turnOnBluetoothIfPossible(); // The bluetooth adapter was turned on.
turnOffBluetoothIfPossible(); // The bluetooth adapter was turned off.

/** Listen for bluetooth power state change */
const unsubscribe = onStateChange(({status})=>{
  console.log(status); // "on" or "off"
})

// Later when does not need to listen this event anymore...
unsubscribe();


/** Listen bluetooth discovery event  */
const unsubscribe = onDiscovery((device)=>{
  console.log(device);
})

// Later when does not need to listen this event anymore...
unsubscribe();

Docs

The following methods are provided:

Whether bluetooth adapter is enabled

  import {getIsEnabled} from 'react-native-bluetooth-le';

  getIsEnabled(); // "on" or "off"

Gets whether bluetooth adapter has low energy support

  import {getIsSupported} from 'react-native-bluetooth-le';

  getIsSupported(); // true or false, true if is current device supports bluetooth low energy operations.

Gets bluetooth adapter name and address

For the user security, make sure to ask the user common bluetooth permissions.

  import {getName, getAddress} from 'react-native-bluetooth-le';

  getName(); // "Samsung S21..."
  getAddress(); // "00:00:00:00:21" Mac address for Android and UUID for some most recent IOS versions.

Gets whether location is enabled

In some operations it's necessary to access user location. To know if user already authorized location fetching use the following method:

  import {getIsLocationEnabled} from 'react-native-bluetooth-le';

  getIsLocationEnabled(); // "on" or "off"

Listen to bluetooth adapter sudden state change

In some operations it's necessary to access user location. To know if user already authorized location fetching use the following method:

  import {onStateChange} from 'react-native-bluetooth-le';

  const unsubscribe = onStateChange(({status})=>{
    console.log(status): // "on" or "off"
  }); 

  // Make sure to "unsubscribe" this event later to avoid listen unnecessary state changes.
  
  unsubscribe(); // Remove registered listener.

Listen bluetooth discovery and find nearby devices

Starts to listen nearby devices using "bluetooth scan". Make sure to enable this functionality on your app for a small period of time since it's consumes too much battery. Android Notes: Make sure to ask the user to enable location since bluetooth scan operations can expose user location to nearby devices.

  import {onDiscovery} from 'react-native-bluetooth-le';

 
  const unsubscribe = onDiscovery((devices = [])=>{
     console.log(devices); // This devices is filtered by it's mac address and never will be sent repeated.
  }); 

  // Make sure to "unsubscribe" this event later to avoid listen discovery.  
  unsubscribe(); // Remove registered listener.

You can find more on our website. :)

Capabilites

• Bluetooth Adapter
  • Verify if device has a bluetooth adapter available and is bluetooth low energy capable. [Supported]
  • Verify if bluetooth adapter is currently enabled. [Supported]
  • Listen to bluetooth peripheral events such turn off, turn on. [Supported]
• GATT (Generic Attribute Profile) Operations
  • Discover [Supported]
    • Allow the device to find out nearby devices. [Supported]
  • Bonding [Supported]
    • Allow bond with a bluetooth peripheral. [Supported]
    • Allow unbound with bounded bluetooth peripheral. [Supported]]
    • Listen to bound and unbound events. [Supported]]
    • Get the current bonded devices anytime. [Supported]]
  • Connection [Supported]]
    • Allow connect to bluetooth peripheral. [Supported]]
    • Allow disconnect from connected bluetooth peripheral. [Supported]]
    • Listen to "connect" and "disconnect" events. [Supported]
  • Device profile
    • Allow discover bluetooth peripheral services and it characteristics. [Supported]]
    • See bluetooth services permissions. [Supported]
    • See bluetooth characteristics permissions. [Supported]
    • See bluetooth characteristics descriptors. [Supported]
    • Characteristic
    • Receive notifications from a device service and characteristic. [Supported]
    • Send data to device characteristic using plain bytes structure. [Supported]
    • Listen to device characteristic data using plain bytes structure. [Supported]

Changelog

- 0.1 (Beta)
    Add support to basic capabilities

Contributing

When opening issue make sure to provide all platform information: SDK, Device Number, Android or IOs version and error stack trace.

Some things to consider when shipping code:

• Make sure to consider platform compability and differences.
• Avoid overhead operations that could slow down perfomance.
• Never persist state.
• Avoid breaking compability in functionality.

  cd playground;
  yarn add ../lib;
  cd android;
  ./gradlew generateCodegenArtifactsFromSchema;
  cd ..;
  yarn run android --active-arch-only;