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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.
@MaBe
It is now posible to build a ESP32C with uart, check the board file.
https://github.com/espruino/Espruino/blob/c45ff321d88c08cf1e72b5d7c6af21d6b82d2380/boards/ESP32C3_IDF4.py#L77