• 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.

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