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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
Yes, after ~1 minute of inactivity Espruino changes connection interval to a lower power mode. But when there's activity it speeds back up to 7.5ms (the fastest interval).
Could it be you're just trying it after a bit of inactivity? Is it better after the first few presses?
You can manually control it with
NRF.setConnectionIntervalif you need to though.