ESP32S2 TCP Server: Error EAGAIN on socket.accept()

[Larrxi]

I try to start a TCP server on my Lilygo TTGO T8 ESP32-S2 with display.

code.py output:
192.168.43.83
will timeoutTraceback (most recent call last):
  File "code.py", line 18, in <module>
OSError: [Errno 11] EAGAIN

Code done running.

I am using the code from here:
https://gist.github.com/hierophect/5bb6133a69f8395841531013d46d2703

[hierophect]

I think this is probably because the Server Socket PR inadvertently changed the default timeout of sockets to 0 instead of None. You could try increasing the timeout with settimeout(None) or try #4049 which will revert to a no-timeout default.

[Larrxi]

With settimeout -1 it give other error EATIMEOUT or something and it did print out the client IP address.

I then try with #4049 (without settimeout) and now it proceeds further:

code.py output:
192.168.43.83
Connected by ('192.168.43.17', 22723)
bytearray(b'Hello, world\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')

The client gets:
Received b''

[Larrxi]

Okey it works when, before connecting socket, setting socket.settimeout(None).
Thanks!

[hierophect]

@Larrxi no problem. Note that since #4095 has now been merged, you shouldn't even need to take that step anymore on the most recent builds, as the default behavior has been returned to a timeout of None.