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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
The 'Disconnected' rejection just seems to occur when Espruino disconnects while trying to connect. It might be made worse by the fact it's trying to keep a connection to the PC going as well? All I can suggest is to do an automatic retry, which you could do by adding
.catch(function(err) {...})