usocket.connect() to down server ignores timeout and no exception thrown

[mfallavol]

WiPy 2.0
v1.8.6-650-g9bacbbd4 on 2017-06-09'

When I attempt to make a socket connection to a machine that is down the timeout value is completely ignored and connect() doesn't throw an exception.

Example code:

import time
import socket
def test1():
start = time.time()
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
s.settimeout(3)
s.connect(('192.168.1.120', 15000))
finish = time.time()
print(finish - start)
s.close()

This takes 18-19 seconds and throws no exception.

[campbellsinclair]

I can confirm that connect() doesn't throw a timeout exception. For me it throws "OSError: -1" after an unspecified amount of time, whether I set a timeout or not.

WiPy 3.0
release 1.18.1.r1

Motivation: Minimise the time network hardware is being used because it consumes a large amount of energy. This is particularly wasteful when using the LTE modem of a GPy, which consumes ~200mA.