ESP8266 Community Forum

martinayotte wrote:Those links show how to communicate ESP with Nano using SoftwareSerial, but none of them showing how to use Nano to upload sketches in ESP without the needs of separate USB-Serial.

Oh, really? I didn't know that! So, if I used SoftwareSerial, would I be using the Nano as the main microcontroller with the ESP as a sort of attachment instead of the ESP being the main microcontroller?

Simply by looking at those sketches, they are all using SoftwareSerial.
And some of them also clearly mentioned that they use external USB-Serial to do the uploads.