A Bluetooth Stack refers to the software that enables communication between Bluetooth-enabled devices. Here's a detailed overview:
Components of a Bluetooth Stack
- Host Controller Interface (HCI): Manages the communication between the host and the Bluetooth Controller.
- Link Manager Protocol (LMP): Controls the establishment and termination of links between devices.
- Logical Link Control and Adaptation Protocol (L2CAP): Provides multiplexing, segmentation, and reassembly of data packets.
- Service Discovery Protocol (SDP): Allows devices to discover services offered by other devices.
- Profiles: Define how applications use protocols to accomplish specific use cases, like Hands-Free Profile or Audio/Video Remote Control Profile.
History
The development of the Bluetooth technology began in the mid-1990s when Ericsson, a Swedish telecommunications company, initiated a study to explore alternatives to cables in short-range communications. Here are key historical points:
- In 1998, the Bluetooth Special Interest Group (SIG) was formed by Ericsson, Nokia, IBM, Intel, and Toshiba to develop and promote Bluetooth technology.
- The first version of Bluetooth, version 1.0, was released in 1999, which included the initial specification for the Bluetooth Stack.
- Over the years, the Bluetooth stack has evolved through various versions, with significant updates including Bluetooth 2.0 + EDR (Enhanced Data Rate) in 2004, Bluetooth 3.0 + HS (High Speed) in 2009, and Bluetooth 4.0 with Low Energy (BLE) in 2010, enhancing data transfer rates, power efficiency, and security.
Context and Usage
The Bluetooth Stack is integral to:
- Device Pairing: Establishing secure connections between devices.
- Data Transfer: Facilitating the exchange of data between devices.
- Power Management: Optimizing power usage for battery-operated devices, especially with the advent of BLE.
- Profile Implementation: Ensuring compatibility with specific Bluetooth profiles for applications like audio streaming, file transfer, or health monitoring.
External Links
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