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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.
@AkosLukacs
5V supercaps have significant internal resistance, IIRC in the 10-100Ω range. Radio transmission would most likely cause a brown out. Don't know if espruino and the radio runs at 2.5V...
Actually a couple of uC vendors have tools for power measurements, just for inspiration:
STM has ammeter in some newer Discovery boards: Cortex L4, Cortex L0
Ti has Energy trace in the MSP432 Launchpad.
Atmel has Power Debugger as a standalone tool with jtag and other debug stuff.