def _check_pong(self):
        """Checks if a Pong message was received.

        :return:
        """
        self.pong_timer.cancel()
        if self.pong_received:
            self.log.debug("_check_pong(): Pong received in time.")
            self.pong_received = False
        else:
            # reconnect
            self.log.debug("_check_pong(): Pong not received in time."
                           "Issuing reconnect..")
            self.reconnect()
Checks if a Pong message was received.

        :return: