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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 needs to be connected at boot time. There is check that RX is pulled high otherwise serial is not enabled. Keeping serial enabled draws about 1mA constantly.
You can try from bluetooth connection to call Serial1.setup and then try Serial1.setConsole to see if it starts working.