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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.
malaire
@Gordon
For sourcing BLE dongles: Maybe do a search for ones available to you in Finland for a sensible price and post some links up here. Then we can tell you if they're ok.
https://www.espruino.com/Bangle.js2#hardware-swd