example output
I (325) main_task: Started on CPU0
I (335) main_task: Calling app_main()
I (335) button: IoT Button Version: 3.4.0
I (335) gpio: GPIO[0]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
I (345) main_task: Returned from app_main()
I (18985) GPIO-BTN: button event: long press
I (24485) GPIO-BTN: button event: short press