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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
it may be related to negotiated connection interval, also in BLE this can be done via subscribing to notification, not reading. when you subscribe the other end sends data when it makes sense (temperature changes, in this case seconds value changes) and you just receive it without request