With numerous upgrades and enhancements of the standard tried the Bluetooth Special Interest Group (Bluetooth SIG or BSIG) to secure a successful future in the standard competition of radio technologies. The host controller interface (HCI) is a command interface to the baseband controller and link manager. It also provides access to the connection parameters. Typically, the HCI will be equated roughly with the TCP socket interface. The HCI and host developers to come into contact, because the commands are addressed in HCI provided by a Bluetooth HCI driver on the host. The Host Control Transport Layer, which is provided by the physical connection, connecting the two instances of HCI two communicating Bluetooth controller. The respective hosts are informed by asynchronous messages through the HCI events and are then responsible for parsing the possible events and carry out the necessary actions.
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