Bluetooth
Bluetooth
Bluetooth integration allows React Native applications to communicate with nearby devices, such as wearables, printers, or IoT hardware, using Bluetooth Low Energy (BLE) or Classic Bluetooth protocols.
Installing a Bluetooth Library
bash
npm install react-native-ble-plx
Requesting Bluetooth Permissions
Modern Android versions require explicit runtime permissions for Bluetooth scanning and connection, in addition to location permissions in some cases.
javascript
await PermissionsAndroid.request(PermissionsAndroid.PERMISSIONS.BLUETOOTH_SCAN);
Scanning for Nearby Devices
javascript
import { BleManager } from 'react-native-ble-plx';
const manager = new BleManager();
manager.startDeviceScan(null, null, (error, device) => {
if (device) {
console.log('Found device:', device.name);
}
});
Connecting to a Device
javascript
const connectedDevice = await manager.connectToDevice(deviceId);
await connectedDevice.discoverAllServicesAndCharacteristics();
Reading and Writing Data
javascript
const characteristic = await connectedDevice.readCharacteristicForService(
serviceUUID,
characteristicUUID
);
Handling Disconnections
Bluetooth connections can drop unexpectedly, so applications should listen for disconnection events and implement reconnection logic where appropriate.
Common Use Cases
- Connecting to fitness trackers and smartwatches
- Communicating with Bluetooth printers
- Controlling IoT devices like smart locks or lights
Conclusion
Bluetooth integration using libraries like react-native-ble-plx enables React Native applications to communicate with a wide range of nearby hardware devices, unlocking powerful IoT and wearable integrations.
