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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@SergeP
it looks like to be easy enough. But I did not use Web Bluetooth API, so I know only how to do that using MQTT and EspruinoHub. Puck.js can advertize sensors data in BLE, EspruinoHub converts it to MQTT messages, while your app connects to MQTT server using WebSockets (e.g. mqtt.js), receives the messages and process.