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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.
user117414
@AkosLukacs
You can use a simple http post to send data to your backend. And from that point it's just like any data, you can do anything. Store it, send it to the client...
Or you could use websockets maybe MQTT.