Those are for the ESP32-S2 chip. Single core, half the SRAM of the ESP32 we use, no bluetooth etc. It has USB support, but the other ESP32 chips don’t. I think this chip is intended more as a migration path for the ESP8266 so prevalent in low cost IoT devices.

Regards, Mark.

On 20 Aug 2021, at 1:10 PM, Derek Caudwell <d.caudwell@gmail.com> wrote:

I was thinking along these lines, https://github.com/chegewara/esp-idf/tree/master/examples/peripherals/usb/tusb_serial_device


by using the usb lines to transfer data the current Uart level shift is not needed and it does not rely on the simcom firmware supporting gsm multiplexing on the serial interface.
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