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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
It's from here: https://github.com/espruino/EspruinoTools/blob/gh-pages/core/serial_chrome.js#L106
which is straight from chrome. https://developer.chrome.com/apps/serial#event-onReceiveError
Chrome says overrun is:
So I guess you could try simply ignoring that particular error? I guess maybe Chrome recently added the reporting of it? Maybe it's just because the ESP8266/etc sent a whole bunch of data before it connected and so some data ended up getting dropped from the buffer?