Light sleep (firmware >= 1.19)
Topic about light sleep mode, available since firmware 1.19.0.b1 :
machine.pin_sleep_wakeup(pins, mode, enable_pull)
Small issue : how to use "machine.pin_sleep_wakeup()" to wake up from light sleep, then disable it (how ?) and use "machine.deepsleep(60000)" so it wakes only after 60s ?
Measured using only software : about 16 ms to wake up from light sleep. Both using wake on pin (interrupt) or timed light sleep.
Need to confirm with external measurement : i(t) powering LoPy4 by using oscilloscope + shunt resistor.
The current consumption on a LoPy4 is about 3.5 mA during light sleep.