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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
also there is no special 'ble turned off' state, the hardware is off all the time when not sending/receiving packet. so when you stop advertising the radio is off all the time. when you start advertising with 1000ms interval the radio is off all the time except 3 packets being sent every second + if device is connectable/scannable then it also briefly listens for scan response request or connection request after sending each of those 3 packets, that's all, there is no other extra cost or difference between BLE being 'on' or 'off'
nrf5x is not raspberry pico w or esp32 where 'turning BLE on' draws extra power.