This method will handle the Ping message and then
        will answer every Ping message with a Pong message
        using the nonce received.

        :param message_header: The header of the Ping message
        :param message: The Ping message

def handle_ping(self, message_header, message):
        """
        This method will handle the Ping message and then
        will answer every Ping message with a Pong message
        using the nonce received.

        :param message_header: The header of the Ping message
        :param message: The Ping message
        """
        log.debug("handle ping")
        pong = Pong()
        pong.nonce = message.nonce
        log.debug("send pong")
        self.send_message(pong)