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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
If you have an android phone, get nRF Connect by Nordic Semi, and watch the RSSI graph as you walk around. I think it's worth to get an idea what to expect. Was using nRF connect just yesterday to test the range of BLE things.
Of course you can do this with
NRF.findDevicesorNRF.setScan, just nRF Connect gives you a graph in a couple of seconds.