ESP32 Forum

So the thing is I need to communicate esp1 and esp2, but I only have access to the microUSB port (to have some more context esp2 is communicating with and android via usb and I would like to replace the android to test the esp2 because it takes ages to boot).

Then I tried using the usb OTG, and USB hosting because I have another esp32s3 but did not seem to get it to work right and I was wondering if maybe I could use a USB/TTL converter

The connections would be like this:

esp1 with a code to send a serial caracter:

tx ------ rx (TTL converter)
rx ------ tx (TTL converter)

esp2 with a already functioning code that sends info back depending on the caracter received:

microUSB port ----- male USB (TTL converter)

would this work? I'm currently waiting for the converter to arrive but I'm open to other alternatives.

Probably not, but it depends on the 'ESP32' in question. If ESP32-S2 or -S3 and the micro-USB is connected to the native USB port (not an USB-serial chip) then it could work. If it's a different ESP32 or there's an USB-serial chip in between, then it won't work. But here's the clincher: you'd need to get USB host working on both the chips in the same way as you'd need to get USB host to work when you connect an ESP32-S3 directly to the micro-usb port, so there's really no point to it.