The service-providing device (11, 18, 19) of the invention is configured to obtain a code associated with the service-providing device, to wirelessly transmit the code, and to receive data from a service-using device (1,2) in response to the wireless transmission. The code does not comprise characteristics of the service-providing device. The service-using device of the invention is configured to receive information about one or more service-providing devices located on a secure local area network (29) over the secure local area network. The information comprises a code for each of the one or more service-providing devices. The service-using device is further configured to select one or more of the received codes, listen for wireless transmission of the selected one or more codes, and transmit data to a device which wirelessly transmitted at least one of the selected one or more codes.