Repeated calls to async_discover_hubs crashes

[capelevy]

Doing:

    print("First")
    hubs = await nobo.async_discover_hubs()
    print("Second")
    hubs = await nobo.async_discover_hubs()

results in an OSError: [WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted.

[oyvindwe]

The socket is supposed to be created with SO_REUSEPORT "to support Windows", and it is properly closed after use:

        transport, protocol = await asyncio.get_running_loop().create_datagram_endpoint(
            lambda: nobo.DiscoveryProtocol(serial, ip),
            local_addr=('0.0.0.0', 10000),
            reuse_port=nobo._reuse_port())
        try:
            await asyncio.sleep(autodiscover_wait)
            while rediscover and not protocol.hubs:
                await asyncio.sleep(autodiscover_wait)
        finally:
            transport.close()
        return protocol.hubs

    def _reuse_port() -> bool:
        """
        Check if we can set `reuse_port` when listening for broadcasts. To support Windows.
        """
        if hasattr(socket, 'SO_REUSEPORT'):
            sock = socket.socket(type=socket.SOCK_DGRAM)
            try:
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
                sock.close()
                return True
            except OSError:
                pass
        return False

Unfortunately, I don't have a Windows box to debug on.