The examples we have created using our Go Direct sensors with JavaScript use a Bluetooth Low Energy (BLE) connection via Web Bluetooth. This is compatible with Android devices running a Chrome browser.
If you find that you are unable to connect to a Go Direct sensors with JavaScript on an Android device, try updating your version of Chrome.
Currently iOS devices are not compatible with this protocol.
Visit https://caniuse.com/web-bluetooth for a compatibility chart and follow the footnotes for details.