[Ovmsdev] OVMS v3.3 hardware

[Derek Caudwell]

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

https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-reference/peripherals/usb_device.html

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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