Socket timeout not honored with SSL

[ccarreiras]

Has anyone faced issues with socket timeouts when using HTTPS connections?

System information:
sysname='GPy'
nodename='GPy'
release='1.18.2.r7'
version='v1.8.6-849-df9f237 on 2019-05-14'
machine='GPy with ESP32'

When configuring a socket to use a timeout, if the socket has been wrapped with the ussl.wrap_socket method, the timeout is not honored.

Given a socket sock which has been successfully connected to a host, trying to call sock.read should return None if the timeout is reached and there is nothing to read in the socket:

import usocket

sock = usocket.socket()
sock.settimeout(5)

sock.connect((host, port))

t = sock.read(1)

# after timeout, t is None
print(t is None)

But when the socket is wrapped with ussl, the timeout setting is ignored and read blocks forever:

import usocket
import ussl

sock = usocket.socket()
sock = ussl.wrap_socket(sock)
sock.settimeout(5)

sock.connect((host, port))

# this hangs indefinitely
t = sock.read(1)

This also happens at least for the readline method.

Take a look at this issue on Github:
https://github.com/pycom/pycom-micropython-sigfox/issues/315