The Web Bluetooth
API lets websites discover and communicate with devices over the
Bluetooth 4 wireless standard using the Generic Attribute Profile (GATT). It is
currently partially implemented in Android M, Chrome OS, Mac, and Windows 10.
This sample illustrates the use of the Web Bluetooth API to get all
characteristics of an advertised service from a nearby Bluetooth Low Energy
Device. You may want to try this demo with the BLE Peripheral Simulator App
from the Google
Play Store and check out the Get
Characteristics (Async Await) sample.
Live Output
JavaScript Snippet
functiononButtonClick(){letserviceUuid=document.querySelector('#service').value;if(serviceUuid.startsWith('0x')){serviceUuid=parseInt(serviceUuid);}letcharacteristicUuid=document.querySelector('#characteristic').value;if(characteristicUuid.startsWith('0x')){characteristicUuid=parseInt(characteristicUuid);}log('Requesting Bluetooth Device...');navigator.bluetooth.requestDevice({filters:[{services:[serviceUuid]}]}).then(device=>{log('Connecting to GATT Server...');returndevice.gatt.connect();}).then(server=>{log('Getting Service...');returnserver.getPrimaryService(serviceUuid);}).then(service=>{log('Getting Characteristics...');if(characteristicUuid){// Get all characteristics that match this UUID.returnservice.getCharacteristics(characteristicUuid);}// Get all characteristics.returnservice.getCharacteristics();}).then(characteristics=>{log('> Characteristics: '+characteristics.map(c=>c.uuid).join('\n'+''.repeat(19)));}).catch(error=>{log('Argh! '+error);});}