A lot is listening about Bluetooth; from time to time there is information about a new version. Low energy is also heard in connection with this radio standard. Some manufacturers have integrated at least parts into Bluetooth. With Bluetooth networks that are decisive for a BUS, there is not yet a big breakthrough. Since Bluetooth can now be found almost everywhere, there are few special application profiles. Unfortunately, you only notice what fits together when you register the devices. Whether as a sub-system or just for individual devices, Bluetooth is certainly important in connection with smart homes. So far a HUB or gateway has always been required for integration in order to make the functions of the Bluetooth devices available to other systems. For development there is the Bluetooth Special Interest Group (SIG), which was founded in the 1990s. The Bluetooth itself was developed for the industry in the 1980s.