(self, payload = "")
send ping data.

        payload: data payload to send server.
send ping data.
send ping data .
def ping(self, payload = ""):
        """
        send ping data.

        payload: data payload to send server.
        """
        self.send(payload, ABNF.OPCODE_PING)
def ping ( self , payload = "" ) : self . send ( payload , ABNF . OPCODE_PING )