:meth:`.WNetworkNativeTransportProto.server_socket` method implementation

def target_socket(self, config):
		""" :meth:`.WNetworkNativeTransportProto.server_socket` method implementation
		"""
		address = config[self.__target_socket_config.section][self.__target_socket_config.address_option]
		port = config.getint(self.__target_socket_config.section, self.__target_socket_config.port_option)

		target = WIPV4SocketInfo(address, port)
		if target.address() is None or target.port() is None:
			raise ValueError('Invalid target address or port')
		return target