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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
Hi - which function are you referring to? I think they should all work on nRF52.
But as @fanoush says, RSSI is generally something reported by the receiving device, so while the Puck can tell you what its RSSI is, the Raspberry Pi should have its own RSSI value it sees for the Puck as well, and that may be all you need.