Bluetooth is defined as a layer protocol architecture consisting of core protocols, cable replacement protocols, telephony control protocols, and adopted protocols. There are certain mandatory protocols for all Bluetooth stack viz link management protocol, logical link control and adaptation protocol (L2CAP) and service discovery protocol. The core protocol consists of base band protocol, link manager protocol, logical link control and adaptation protocol, service discovery protocol, cable replacement protocol, telephony control protocol, adopted protocols. Bluetooth technology is designed for and optimized for use in mobile devices. Mobile computers, cellular handsets, network access points, printers, desktops, keyboards, joysticks are used. The other device can have short range Bluetooth radios operating in the free 2.4GHz Industrial-Scientific-Medical band integrated into them. Bluetooth is designed for both computing and communications applications, it is designed to support high quality simultaneous voice and data. It supports both synchronous and asynchronous services and easy integration of TCP/IP for networking purposes. It is used for the control of radio link between two devices. It is used to multiple logical connections between two devices using different higher level protocols. Many Bluetooth applications are used radio frequency communications protocol, because of its widespread support and publicly available API on most operating systems. Additionally, applications that used a serial port to communicate can be quickly ported to use radio frequency communications protocol. It is used by the advanced audio distribution profile to stream music and to stereo headsets.
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