ESP32 Forum

I have some trouble to reflash the ESP32S3 after activating the USB-CDC (tinyUSB). So basically the only option at the moment is to press the button to go into the bootloader mode at startup to reflash the device.

Now assume I have the device connected to a SBC in the field and communication is only over USB-CDC, I cannot send someone to press the button for a DFU. One could do a custom bootloader to solve this problem, but i would like to use the standard idf tools provided and I think it should work. In the menuconfig there seems also to be the option to activate DFU/runtime DFU, might this be a solution? If so, are there any examples about that, I could not find one in the ESP-IDF Examples list.

For example for the Arduino IDE there this features seems to be available:

(https://espressif-docs.readthedocs-host ... flash.html)

I cannot find anything similar for the ESP-IDF, does anyone have a suggestion how this could be done?

On arduino, when you have enabled DFU option, additional endpoint with descriptor is added.
In esp-idf tinyUSB you have to do it exclusively.

Why is that so? Does the Arduino framework come with a replacement of the USB stack or where is the additional flexibility coming from?

Its how USB library in arduino is prepared.
If you enable DFU then additional endpoint is added to your code.