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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.
@Gordon
EspruinoHub is a service which runs and which converts Bluetooth LE traffic into MQTT and vice-versa. It'll also log data and allow you to query it - eg to find the temperature for the past week.
However if you just want to talk to Bangle.js, there's a whole page on the different ways you can do it from different programming languages: https://www.espruino.com/Interfacing#bluetooth-le