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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.
@AkosLukacs
There are a bunch of ready-made ESP32 boards with lora chips. Come in handy, because first you have a mostly self-contained devboard some even have a small display and/or battery connector. Second because there are arduino samples for them, so you can verify with arduino samples if you are stuck :)
But of course there as a drawback of long shipping time, and you might not get what you expect.
RFM96 (IIRC I tested, and does work with the Espruino library) from Hope RF is I think available from lots of "western" suppliers, if you want something quickly.