ESP32 Forum

Hi,

I plan on using the AT command firmware in an ESP32-WROOM-32D.

It appears to have hardware flow control (RTS/CTS) enabled by default.

I'm not using flow control and have left pins GPIO14 & 15 unconnected.

My question is what is the default state of the CTS pin (GPIO15) and what is the sense of CTS?

In other words I want to make sure that transmission out of the esp32 won't be blocked by default.

RTS CTS seems to be optional. Mine only connects TX, RX, GND and it works fine. No need to connect CTS and RTS. Maybe you can have a try.

Thanks Helen, that's all I needed to know.
I couldn't try it because our custom board is yet to be manufactured and was checking if we should add any pull resistors on cts, but obviously not required.
Cheers.