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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
1.5km... sure: a linear amp on both side on a ESP8266 can do so... but that gets you into different problems. In case you have line of sight, directional antennas can help... but 300m is already a challenge...