The default on esp32-s3 is 8 & 9, but you can assign them to whatever you want with Wire.begin(sda, scl);

Take out all the softwareSerial stuff. You are starting up Serial2 correctly. Take out the stuff where you are reading Serial2 at the beginning of loop(). Change the while to look something like this: while (Serial2.available() > 0) { char nextbyte = Serial2.read(); Serial.print(nextbyte); if (gps.e...

Yes, you will have to wait for other people to fix the code you want to use.
There is no reason for you to be on the bleeding edge if you don't know how to fix it. arduino-esp32 v2.0.15 was released last week and the libraries will work well with it.

WiFiClient doesn't know anything about protocols beyond TCP. It establishes a bare connection to the server listening on a port. Cut off the stratum+tcp:// from your host and it will make the connection. It certainly is not going to (and shouldn't in this highly insecure way) be able to transact wit...

My guess is a port conflict. They will both be trying to set up an httpd on port 80. Try using the OTA push example running on a different port and see if that works for you.

This is a snip from a deep sleep app on esp32-c6 log_v("to sleep"); rtc_gpio_pullup_en(PIN_DN); rtc_gpio_pulldown_dis(PIN_DN); rtc_gpio_pullup_en(PIN_UP); rtc_gpio_pulldown_dis(PIN_UP); rtc_gpio_pullup_dis(PIN_IR); rtc_gpio_pulldown_dis(PIN_IR); uint64_t wakeup_pins = (1ULL<<PIN_IR) | (1ULL<<PIN_UP)...

What version of arduino-esp32 are you running (you can see this in the board manager)?
There were some issues with earlier versions of esptool on the C3, but if you are running 2.0.15, that should be resolved.

You need a stronger pullup than what is included in the pump control circuit there. Try a 10K. From your description, this is happening when the device restarts, so it literally can't be a problem in your code (which isn't running during a restart). You say there's more involved in the circuit- I am...

Put a 10-50K pullup resistor on the pins you want to stay high. When the device resets, there is not going to be any signal delivered on those pins, so you need to provide a default one.
You should choose a pin other than 12, which is a strapping pin that needs to be pulled low for 3V3 flash.