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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 uses 1924 vars (@16b/var) when doing this using ESP8266 with AT commands.
BUT: even just connecting to the network (without any WebSockets) uses 1305 vars with ESP8266, so I'd say you're probably not that far off being able to make this work.