UART is used when a Bluetooth chip is built into the system, such as in tablet devices. UART and USB are two of the leading interfaces for Bluetooth chips. Advanced audio distribution profile (A2DP) is used for audio over Bluetooth, while HFP is used for hands-free operation of mobile phones. There are many profiles defined, and two examples of these profiles are A2DP and hands-free profile (HFP).
These specific applications of Bluetooth are standardized as various profiles. This usage scenario did not take off as anticipated however, Bluetooth now is used to transfer data and control signal between two devices. For example, the electronic devices in a home can be connected to a central control system via Bluetooth, and the central control system is controlled over the Internet. Bluetooth enables one to create a personal area network wherein multiple devices talk to each other wirelessly via Bluetooth-a typical usage is home control automation systems. Bluetooth uses short-wavelength UHF radio waves of a frequency range between 2.4 and 2.485 GHz. Vijayakrishnan Rousseau, in System on Chip Interfaces for Low Power Design, 2016 Bluetoothīluetooth is a short-range wireless communication technology standard.
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