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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
Can you try installing the new firmware? https://www.espruino.com/Puck.js#firmware-updates
The new one contains some changes that should make connection a bit more reliable - unfortunately I just found out that Seeed flashed an older firmware onto all the devices than they should have.