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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
Ok, found and fixed it! If you upload again now it should work.
We were using
String.charCodeAtin a String, and expecting it would report back 0 if the string didn't include the character. A recent PR for Espruino changed it to report backNaNas per the spec, and that broke this MQTT lib.