C: https://github.com/Redisage/PAC-ESP32/tree/master/C_examples/hello_world

MicroPython: https://github.com/Redisage/PAC-ESP32/tree/master/uPython_examples/hello_world

This example use UART0 in MCU which is reserved for the console. Simple string is printed on console and then MCU restarts after 10 seconds.