BluetoothLEClient

A client implementation for interacting with Bluetooth Low Energy peripherals.

Supported platforms

• Web
• Android
• iOS

Usage

Install the plugin via npm

npm install --save cap-bluetooth-low-energy-client

In your capacitor project, make sure to register the Android plugin in in the projects MainActivity as follows

import com.bleclient.plugin.BluetoothLEClient;
 
public class MainActivity extends BridgeActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 
    this.init(savedInstanceState, new ArrayList<Class<? extends Plugin>>() {{
      add(BluetoothLEClient.class);
    }});
  }
}

import {Plugins} from "@capacitor/core";
 
const {BluetoothLEClient} = Plugins;
 
//...do something with plugin
 

API Documentation

Interface and type definitions can be found here.

isAvailable

isAvailable(): Promise<BluetoothGATTAvailabilityResult>

Check wheter your device supports Bluetooth Low Energy.

options none
returns Promise<BluetoothGattAvailabilityResult>

isEnabled

isEnabled(): Promise<BluetoothGATTEnabledResult>

Check whether or not Bluetooth is enabled on your device.

options none
returns Promise<BluetoothGATTEnabledResult>

enable

enable(): Promise<BluetoothGATTEnableResult>

Enable Bluetooth on your device.

Note: This method is only available for Android devices at the moment. On other platforms (e.g. Web) the enable() method will simply resolve.

options none
returns Promise<BluetoothGATTEnableResult>

scan

scan(options: BluetoothGATTScanOptions): Promise<BluetoothGATTScanResults>

Initiates a Bluetooth scan and returns a list of available devices to pair with.

Note: Filtering for specific service UUIDs does not work for Android at the moment. For Web usage, in order to be able to interact with a peripheral's services, one has to use filters when scanning.

options BluetoothGATTScanOptions
returns Promise<BluetoothGATTScanResults>

connect

connect(options: BluetoothGATTConnectOptions): Promise<BluetoothGATTConnectResult>

Establish connection to a peripheral's GATTServer.

options BluetoothGATTConnectOptions
returns Promise<BluetoothGATTConnectResult>

disconnect

disconnect(options: BluetoothGATTDisconnectOptions): Promise<BluetoothGATTDisconnectResult>

Disconnect from a peripheral's GATTServer.

options BluetoothGATTDisconnectOptions
returns Promise<BluetoothGATTDisconnectResult>

discover

discover(options: BluetoothGATTServiceDiscoveryOptions): Promise<BluetoothGATTServiceDiscoveryResult>

Perform service discovery on a given Peripheral.

Note: This method does not need to be called in Browsers, since service discovery takes place implicitly.

options BluetoothGATTServiceDiscoveryOptions
returns Promise<BluetoothGATTServiceDiscoveryResult>

read

read(options: BluetoothGATTCharacteristicReadOptions): Promise<BluetoothGATTCharacteristicReadResult>

Read value of GATT-Characteristic.

options BluetoothGATTCharacteristicReadOptions
returns Promise<BluetoothGATTCharacteristicReadResult>

write

write(options: BluetoothGATTCharacteristicWriteOptions): Promise<BluetoothGATTCharacteristicWriteResult>

Write value of GATT-Characteristic.

options BluetoothGATTCharacteristicWriteOptions
returns Promise<BluetoothGATTCharacteristicWriteResult>

readDescriptor

readDescriptor(options: BluetoothGATTDescriptorReadOptions): Promise<BluetoothGATTDescriptorReadResult>

Read value of GATT-Descriptor.

options BluetoothGATTDescriptorReadOptions
returns Promise<BluetoothGATTDescriptorReadResult>

writeDescriptor

writeDescriptor(options: BluetoothGATTDescriptorWriteOptions): Promise<BluetoothGATTDescriptorWriteResult>

Write value of GATT-Descriptor.

options BluetoothGATTDescriptorWriteOptions
returns Promise<BluetoothGATTDescriptorWriteResult>

enableNotifications

enableNotifications(options: BluetoothGATTNotificationOptions): Promise<BluetoothGATTEnableNotificationsResult>

Be notified when the value of a GATT-Characteristic changes. In order to retrieve the changed value, one has to use an Event Listener. Thereby, the event name is the string representation of a GATT-Characteristic's Hexadecimal UUID.

const listener = BluetoothLEClient.addListener( eventName , (data) => {
    
    const {value} = data;
    //Do something with the data
    
});

options BluetoothGATTNotificationOptions
returns Promise<BluetoothGATTEnableNotificationsResult>

disableNotifications

disableNotifications(options: BluetoothGATTNotificationOptions): Promise<BluetoothGATTDisableNotificationsResult>

Stops the propagation of value changes.

Additionally, the event listener has to be removed.

listener.remove();

options BluetoothGATTNotificationOptions
returns Promise<BluetoothGATTDisableNotificationsResult>

getServices

getServices(options: GetServiceOptions): Promise<GetServiceResult>

Retrieves a list of available GATT-Services for a given peripheral's GATT-Server.

options GetServiceOptions
returns Promise<GetServiceResult>

getService

getService(options: GetServiceOptions): Promise<GetServiceResult>

Retrieves a single GATT-Service, specified by UUID.

options GetServiceOptions
returns Promise<GetServiceResult>

getCharacteristics

getCharacteristics(options: GetCharacteristicOptions): Promise<GetCharacteristicResult>

Retrieves a list of available GATT-Characteristics for a given GATT-Service.

options GetCharacteristicOptions
returns Promise<GetCharacteristicResult>

getCharacteristic

getCharacteristic(options: GetCharacteristicOptions): Promise<GetCharacteristicResult>

Retrieves a single GATT-Characteristic, specified by UUID.

options GetCharacteristicOptions
returns Promise<GetCharacteristicResult>