A React web app that uses Web Bluetooth to scan for a Bluetooth device advertising the Environmental Sensing GATT service, connects to it, reads a value from the device's Battery Service's Battery Level GATT characteristic, logs it, and disconnects from the device. Obviously, this is a very specific use case, but one can easily change these by modifying src/App.js to scan for a different GATT service instead.

To take a quick peek at the web app, visit https://cheeyi.github.io/web-bluetooth-poc/, which was deployed from the main branch and lives on the gh-pages branch.

This project was bootstrapped with Create React App.

In the root directory of the project:

1. Run npm install to install dependencies.
2. Run npm start to build and run the app in the development mode.
3. Open http:https://localhost:3000 to view it in your browser (Chromium-based browsers preferred).

The page will reload when you make changes.

1. Open package.json and update homepage to point to your GitHub profile and repo name.
2. Run npm run deploy.

It's important to realize that the Web Bluetooth specification has not been finalized yet. However, here are some limitations I've come across:

• Web Bluetooth's API availability is determined by your browser vendor. For example, Safari doesn't support Web Bluetooth because Apple declined to implement it.
• It's possible to scan for all BLE devices in the vicinity if one specifies acceptAllDevices: true in the requestDevice call, but only GATT services specified in the optionalServices: [] key can be interacted with. This means that we'll not be able to do anything with a device if we don't know (or didn't guess correctly) what GATT services a device has beforehand.
• Web Bluetooth requires the user to explicitly select a device using a pop-up browser prompt. Depending on your app's use case, this may or may not be a dealbreaker.
• Some APIs have yet to be fully implemented, such as getDevices() as of the time of writing. Check out the Implementation Status page for updated information.

• React tutorial
• Web Bluetooth specification
• Web Bluetooth examples
• Type definition for Web Bluetooth