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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.
@Ollie
If like Robodyn there’s an antenna embedded in the board itself, there’s a tiny hole in it. Trying shorting it and grounding at the hole. I can’t remember which worked, but on Robodyn that improved reception - which I believe is the issue.
Probably not practical fix as board gets very warm.
But problems I experienced on Robodyn just same as you describe and above worked.