Thank you. So if no ULP and RTC memory is defined, the chip should take about 2.5µA and still be able to wake-up by timer or GPIO interrupt. Interesting, I will try that. Thank you!

Hello Marek, your code does not compile for me on Arduino, any advice what could be wrong? Here is error message: /tmp/arduino_build_150223/core/core.a(main.cpp.o):(.literal._Z8loopTaskPv+0x8): undefined reference to `setup()' /tmp/arduino_build_150223/core/core.a(main.cpp.o):(.literal._Z8loopTaskPv...

Hello, thank you. I am aware of deep sleep and I use it. The question is how to wake by RTC from hibernation. Hibernation is not deep sleep. Jan

Hello, I have not found any documentation on this. Can someone please share example how to properly configure hibernation and rtc in order to wake ESP32 by the rtc?

Thank you, Jan