JSGatt

JSGatt adds some syntactic sugar on top of the web bluetooth api.

import Device from 'jsgatt';

const phone = new Device();
const battery = phone.register(
  'battery_service', // service name or UID
  'battery_level' // characteristic name or UID
);

document.querySelector('button').addEventListener(function(){
  battery().then(value => {
    if (value.getUint8(0) < 20) {
      alert('low battery!');
    }
  });
});

Features

✓ shorter syntax ✓ auto reconnection ✓ caches characteristics ✓ aggregates services for the same device ✓ prevents writing if another writing is in progress ✓ handles accessing a characteristic while the device is still connecting

API

• use device = new Device() to instantiate a new bluetooth device
• use accessor = device.register('service','characteristic') to get access to the desired characteristic within service, both names and UIDs are supported
• use accessor() to read and accessor(value) to write, they both return a promise
• use accessor.getCharacteristic() to get access to the characteristic object, useful if you need to subscribe to updates from the characteristic

Examples

Check your browser support for web bluetooth before running.

• Toggle and change color of a smart light - demo, video, source to run this example you'll need an Awox smartlight.
• Use the webcam to set the color from a smart light - demo, video, source to run this example you'll need an Awox smartlight.
• Toggle a smart light using the voice - demo, video, source to run this example you'll need an Awox smartlight.
• Subscribe to the battery level service - demo, video, source you can emulate a battery level service using any Android device with the BLE peripheal simulator app
• Drive a Parrot mini drone with the keyboard - demo, source to run this example you'll need a Parrot Minidrone. Massive thanks to poshaughnessy and voodootikigod for the original codebase.

Slides

I made a few slides to explain and detail the examples, you can find them on slides.com.