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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.
@bluebie
ESP8266 modules with pcb trace antennas have a range of about 0.35km, but tests on youtube indicate you can get a little over 4km range between an esp8266 module with trace antenna and a Ubiquiti NanoBridge M2 access point - these are simply fairly powerful wifi APs with a directional antenna. Some ESP8266 boards include a u/fl coaxial antenna connector, so you can plug in an external 2.4ghz antenna. If you put a directional antenna on each end, I bet you'd get some truly awesome range. That's how I'd try and do it.
Have you thought about using regular RC radio tech, like the kind used for remote control cars and stuff? It's quite resistant to interference, long range, and available very cheaply on sites like hobbyking. You might not need any microcontrollers at all!