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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.
@fanoush
you can check the RSSI value when scanning to guess the distance, nrfConnect app on phone can show it. Too bad there is no speaker but there are LEDs and light sensor so you can blink it in the dark to possibly see it or you can use torch and read the light sensor to see if the light is hitting it.