def _handle_pong(self, ts, *args, **kwargs):
        """
        Handles pong messages; resets the self.ping_timer variable and logs
        info message.
        :param ts: timestamp, declares when data was received by the client
        :return:
        """
        log.info("BitfinexWSS.ping(): Ping received! (%ss)",
                 ts - self.ping_timer)
        self.ping_timer = None
Handles pong messages; resets the self.ping_timer variable and logs
        info message.
        :param ts: timestamp, declares when data was received by the client
        :return: