The host stack is generally implemented as part of an operating system, or as an installable package on top of an operating system. The controller stack is generally implemented in a low cost silicon device containing the Bluetooth radio and a microprocessor. The Bluetooth protocol stack is split in two parts: a "controller stack" containing the timing critical radio interface, and a "host stack" dealing with high level data. This article gives an overview of the core protocols and those adopted protocols that are widely used. Additional protocols have been adopted from other standards bodies. Core protocols are defined by the trade organization Bluetooth SIG. The wireless data exchange standard Bluetooth uses a variety of protocols.
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