I am considering if the timing of the UART is very crucial to the ESP32.
I tried to pipe the signals from FTDI through the PIC32 to the ESP32 using mirrored GPIOs, and then I get responses from ESP.
I then tried to pipe the FTDI through two uarts in the PIC32, and that does not work.
The signals ...

Thanks a lot - makes the troubleshooting a lot easier with the trace on.

I see the reset, and the response from the ESP with the "ready for download" message.
then, What I can see is that the sync frames are sent to the ESP but no response from the ESP.

When comparing to the FTDI, the sending ...

Hi.

I have designed a board using a PIC32 processor as programming interface to ESP32, in order to have USB programming option in the board (similar to other design using FTDI etc).
I use RTS and DTR for boot and enable/reset, and the TXDO/RXDO for programming.

The problem is that I can not get ...