A method of exchanging messages at a device in a wireless network comprises transmitting a change request message for requesting a change of a beacon position among configuration parameters of the wireless network to a coordinator; and receiving a response message in response to the request message from the coordinator. This photo-biologic minimum biofilm inhibitory concentration of infrared light will lower the minimum inhibitory concentration necessary of an antibiotic andor antifungal molecule necessary to decrease bacterial and fungal pathogens in human tissues. In addition, the present invention includes embodiments for removable attachment devices for such aquatic facilities that provide modular and interchangeable platforms for entertainment, physical therapy appliances as well as for general comfort and serviceability of the facility. In one embodiment, the present the invention includes an actuated tilting table which tilts in four degrees of freedom.