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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.
CarlR
You can use
NRF.connect/disconnectevents to figure out when a central is connected to you or not: http://www.espruino.com/Reference#l_NRF_connectI'd have thought that would do you, but you can also use the oddly named
NRF.getSecurityStatus().connectedto 'poll' as well: http://www.espruino.com/Reference#l_NRF_getSecurityStatus