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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.
@Gordon
I'd have expected a lot more than 6 meters in a corridor! I get about that here with 4 brick walls and a ceiling in the way as well.
It shouldn't actually hit the battery life that much going with the higher power - maybe 10-20%.
I'm not 100% sure Bluetooth 5 will help much (unless you have a new radio - the nRF52840 is supposed to be a bit better I believe) since the Bluetooth advertisements are still the same I think. If you're in a connection then devices can negotiate a lower datarate as they get further away and that'll definitely help though.