ESP LWIP network stack cannot handle 3 binds correctly. #8363
Description
CircuitPython version
Adafruit CircuitPython 9.0.0-alpha.1-25-g000d22f25 on 2023-08-30; VCC-GND YD-ESP32-S3 (N16R8) with ESP32S3Code/REPL
import wifi
from socketpool import SocketPool
from adafruit_requests import Session
pool = SocketPool(wifi.radio)
_socket = pool.socket(pool.AF_INET, pool.SOCK_STREAM)
_socket2 = pool.socket(pool.AF_INET, pool.SOCK_STREAM)
_socket.bind(("0.0.0.0", 20))
_socket.listen(1)
_socket2.bind(("0.0.0.0", 21))
_socket2.listen(1)
a = _socket.accept()
b = _socket2.accept()
a.close()
b.close()
print("ok")Behavior
If we were to just telnet into both, the program would print "ok" and close both connections.
However, we can only connect on the first.
The second is stuck at SYN_WAIT.
Description
No response
Additional information
This is needed to properly implement PASV for ftp.
ACTIVE with a bind & a connection, works just fine.
Reproducible on S2 too.