ESP32-S3 does not boot until Serial console is attached. (Using CDC on Boot).

[sblantipodi]

Hi all...
I'm using an Esp32-S3 (from Lolin and from Unexpected Maker)

to use the Serial.print() on the ESP32-S3 I need to add this build_flags:
‘-D ARDUINO_USB_MODE=1’
‘-D ARDUINO_USB_CDC_ON_BOOT=1’
to my platformio.ini.

If I add this flags I can correctly print to Serial but the microcontroller doesn’t “boot” automatically.
If I connect the microcontroller to a power bank, the sketch does not start,
if I connect it to the usb the sketch does not start until I open the Serial monitor.

how this is possible?

code can be found here:
https://github.com/sblantipodi/glow_worm_luciferin/tree/reduced_footprint

[sblantipodi]

similar problem when disconnecting the serial console.
when disconnecting the serial console the ESP stops working.

[sblantipodi]

Closing because I have found a duplicate issue here.
espressif/arduino-esp32#7554

My problem was related to the fact that Serial.flush() is now blocking on ESP32-S3