USB Host CDC-ACM driver

[tore-espressif]

With commit https://github.com/espressif/esp-idf/co ... 6e2ff79cd9 esp-idf is extended with USB Host CDC-ACM driver and its examples.

Two types of CDC devices are supported:

• CDC-ACM compliant devices

• CDC-like vendor specific devices (usually found on USB to UART bridge devices)

For more information check the READMEs and examples in https://github.com/espressif/esp-idf/tr ... b/host/cdc folder.

In future, this driver will be extended with non-blocking TX transfers and interface to esp_modem component to provide support for 4G USB modems.

Notes:
This extension is valid only for targets with USB OTG peripheral, that means ESP32-S2 and ESP32-S3 at the time of writing.
It is available in esp-idf masterbranch after aforementioned commit and will be added to release 4.4.