Web Bluetooth / Device Info (Async Await) Sample

Available in Chrome 55+ | View on GitHub | Browse Samples

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, Linux, and Mac.

This sample illustrates the use of the Web Bluetooth API to retrieve basic device information from a nearby Bluetooth Low Energy Device. You may want to check out the Device Info (Promises) sample.

Live Output


JavaScript Snippet

async function onButtonClick() {
  let filters = [];

  let filterService = document.querySelector('#service').value;
  if (filterService.startsWith('0x')) {
    filterService = parseInt(filterService);
  }
  if (filterService) {
    filters.push({services: [filterService]});
  }

  let filterName = document.querySelector('#name').value;
  if (filterName) {
    filters.push({name: filterName});
  }

  let filterNamePrefix = document.querySelector('#namePrefix').value;
  if (filterNamePrefix) {
    filters.push({namePrefix: filterNamePrefix});
  }

  let options = {};
  if (document.querySelector('#allDevices').checked) {
    options.acceptAllDevices = true;
  } else {
    options.filters = filters;
  }

  try {
    log('Requesting Bluetooth Device...');
    log('with ' + JSON.stringify(options));
    const device = await navigator.bluetooth.requestDevice(options);

    log('> Name:             ' + device.name);
    log('> Id:               ' + device.id);
    log('> Connected:        ' + device.gatt.connected);
  } catch(error)  {
    log('Argh! ' + error);
  }
}