Wireless network system with at least - a control device having at least a communication interface for transmitting and receiving data over a wireless medium and - a function device (21, 21', 21") comprising at least - a communication interface for transmitting and receiving data over a wireless medium, - a first network address, - a predefined identifier, allowing to individualize said function device (21, 21', 21") and enabling a directed communication with said function device (21, 21', 21") in case of a network address conflict, - a device configuration memory and - an application interface connectable to an application device and configured to receive an application control command over said wireless medium, where - said control device being configured to send said application control command to said function device (21, 21', 21") with said first network address, - said function device (21, 21', 21") being configured upon reception of said application control command to at least send an acknowledgement signal to said control device, - said control device being configured to send conflict information to said function device (21, 21', 21") addressed with said predefined identifier in case more than one acknowledgement signal is received, and - said function device (21, 21', 21") being configured upon reception of said conflict information to store a second network address, different from said first network address, in said device configuration memory so that said function device (21, 21', 21") is addressable in said network system using said second network address. - a control device having at least a communication interface for transmitting and receiving data over a wireless medium and - a function device (21, 21', 21") comprising at least - a communication interface for transmitting and receiving data over a wireless medium, - a first network address, - a predefined identifier, allowing to individualize said function device (21, 21', 21") and enabling a directed communication with said function device (21, 21', 21") in case of a network address conflict, - a device configuration memory and - an application interface connectable to an application device and configured to receive an application control command over said wireless medium, where - a communication interface for transmitting and receiving data over a wireless medium, - a first network address, - a predefined identifier, allowing to individualize said function device (21, 21', 21") and enabling a directed communication with said function device (21, 21', 21") in case of a network address conflict, - a device configuration memory and - an application interface connectable to an application device and configured to receive an application control command over said wireless medium, where - said control device being configured to send said application control command to said function device (21, 21', 21") with said first network address, - said function device (21, 21', 21") being configured upon reception of said application control command to at least send an acknowledgement signal to said control device, - said control device being configured to send conflict information to said function device (21, 21', 21") addressed with said predefined identifier in case more than one acknowledgement signal is received, and - said function device (21, 21', 21") being configured upon reception of said conflict information to store a second network address, different from said first network address, in said device configuration memory so that said function device (21, 21', 21") is addressable in said network system using said second network address.