ESP32S2 Server

code.py

import wifi
import socketpool

# connect to wifi
wifi.radio.connect("YOURNETWORK", "YOURPASS")

pool = socketpool.SocketPool(wifi.radio)

print(wifi.radio.ipv4_address)
HOST = wifi.radio.ipv4_address
PORT = 80        # Port to listen on

# make socket
sock = pool.socket(pool.AF_INET,pool.SOCK_STREAM)

sock.bind((HOST, PORT))
sock.listen(1)
conn, addr = sock.accept()
with conn:
    print('Connected by', addr)
    buff = bytearray(128)
    numbytes = conn.recvfrom_into(buff)
    if numbytes:
        print(buff)

while True:
    pass

Now I feel the need for having a CircuitPython way to update some Dynamic DNS thing, or some "Bonjour", or to make sure that it register a name when doing DHCP. That way, without doing some static allocation in your DHCP server, you could "find" your board and talk to it.

How close is this API from the Python Network API so that existing piece of software server can be ported?

I'm probably not the right person to ask about that, unfortunately, I'm still very new to the Socket API. But I'll try and do some research about it.