def dump(self):
        """Print packet content."""
        print "-----MqttPkt------"
        print "command = ", self.command
        print "have_remaining = ", self.have_remaining
        print "remaining_count = ", self.remaining_count
        print "mid = ", self.mid
        print "remaining_mult = ", self.remaining_mult
        print "remaining_length = ", self.remaining_length
        print "packet_length = ", self.packet_length
        print "to_process = ", self.to_process
        print "pos = ", self.pos
        print "payload = ", self.payload
        print "------------------"
Print packet content.