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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
Interesting about the WiFi - I haven't had to explicitly disable it on my Pis however I believe I'm running the Lite Raspbian which doesn't have the desktop and so I imagine won't be using WiFi to scan for access points of anything.
If you actually use WiFi for connections you'll have huge issues though since it's trying to use the same aerial.
Occasionally it will fail, it's pretty much guarantees - I guess potentially that code could be improved to retry after a timeout, or you could make the service readable and could perform a read after the write in order to check that everything was ok?