closed remote connection on windows.

Describe the bug running tests on windows now fails, specifically, test test_server_different_port in test_server.py.

To reproduce

(.env) C:\Users\gqb\dev\oscpy>pytest -k test_server_different_port
Test session starts (platform: win32, Python 3.6.1, pytest 4.2.0, pytest-sugar 0.9.2)
rootdir: C:\Users\gqb\dev\oscpy, inifile:
plugins: sugar-0.9.2, cov-2.6.1
collecting ...

―――――――――――――――――――――――――――――――――――――――――――― test_server_different_port ――――――――――――――――――――――――――――――――――――――――――――

    def test_server_different_port():
        # used for storing values received by callback_3000
        checklist = []

        def callback_3000(*values):
            checklist.append(values[0])

        # server, will be tested:
        server_3000 = OSCThreadServer(encoding='utf8')
        sock_3000 = server_3000.listen( address='0.0.0.0', port=3000, default=True)
        server_3000.bind(b'/callback_3000', callback_3000)

        # clients sending to different ports, used to test the server:
        client_3000 = OSCClient(address='localhost', port=3000, encoding='utf8')

        # server sends message to himself, should work:
        server_3000.send_message(
            b'/callback_3000',
            ["a"],
            ip_address='localhost',
            port=3000
        )
        sleep(0.05)

        # client sends message to server, will be received properly:
        client_3000.send_message(b'/callback_3000', ["b"])
        sleep(0.05)

        # sever sends message on different port, might crash the server on windows:
        server_3000.send_message(
            b'/callback_3000',
            ["nobody is going to receive this"],
            ip_address='localhost',
            port=3001
        )
        sleep(0.05)

        # client sends message to server again. if server is dead, message
        # will not be received:
        client_3000.send_message(b'/callback_3000', ["c"])
        sleep(0.1)

        # if 'c' is missing in the received checklist, the server thread
        # crashed and could not recieve the last message from the client:
>       assert checklist == ['a', 'b', 'c']
E       AssertionError: assert ['a', 'b'] == ['a', 'b', 'c']
E         Right contains more items, first extra item: 'c'
E         Use -v to get the full diff

tests\test_server.py:927: AssertionError
----------------------------------------------- Captured stderr call -----------------------------------------------
Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\gqb\AppData\Local\Programs\Python\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Users\gqb\AppData\Local\Programs\Python\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "c:\users\gqb\dev\oscpy\oscpy\server.py", line 336, in _listen
    data, sender = sender_socket.recvfrom(65535)
ConnectionResetError: [WinError 10054] Une connexion existante a dû être fermée par l’hôte distant

 tests/test_server.py ⨯                                                                               100% ██████████

Results (0.56s):
       1 failed
         - tests/test_server.py:883 test_server_different_port
      80 deselected

(.env) C:\Users\gqb\dev\oscpy>

Expected behavior Test should pass, there is no reason that sending from client should crash the server.

Platform (please complete the following information):

OS: windows 10
Python version. 3.6.1
release or git branch/commit: master

Additional context doesn't reproduce in CI, only on a real windows, it seems…

kivy / oscpy

closed remote connection on windows. #48