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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.
@allObjects
ESP12E is just an ESP8266 and you may run out of memory because the ESP code and the Espruino w/ application fight for the same RAM... And that's not the only issue you will run into, because ESP code has priority and may mess up your app running in Espruino JS. One processor is just not good enough to handle all at the same time, especially since ESP code behaves like bit banger in communication respects.
Running your app on a native Espruino board and using the ESP for wifi - as Espruino-Wifi does and any Espruino boartd with any ESP8266 board do - gives you enough power and independence for the app and the wifi communication/
I assume you consulted Espruino on ESP8266 and the related forum conversations that will get you started with Espruino on your current device.