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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
Both changes of course affect battery life and also having the RSSI handler set to your JS code on Puck side and being called so frequently draws battery even more. So doing both changes (interval and TX power) but reading RSSI on Raspberry side may be the best.