.. _bluetooth-features:

Supported features
##################

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Since its inception, Zephyr has had a strong focus on Bluetooth and, in
particular, on Bluetooth Low Energy (LE). Through the contributions of
several companies and individuals involved in existing open source
implementations of the Bluetooth specification (Linux's BlueZ) as well as the
design and development of Bluetooth LE radio hardware, the protocol stack in Zephyr has
grown to be mature and feature-rich, as can be seen in the section below.

* Bluetooth v5.3 compliant

  * Highly configurable

      * Features, buffer sizes/counts, stack sizes, etc.

  * Portable to all architectures supported by Zephyr (including big and
    little endian, alignment flavors and more)

  * Support for :ref:`all combinations <bluetooth-hw-setup>` of Host and
    Controller builds:

    * Controller-only (HCI) over UART, SPI, USB and IPC physical transports
    * Host-only over UART, SPI, and IPC (shared memory)
    * Combined (Host + Controller)

* :ref:`Bluetooth-SIG qualifiable <bluetooth-qual>`

  * Conformance tests run regularly on all layers (Controller and Host, except
    BT Classic) on Nordic Semiconductor hardware.

* :ref:`Bluetooth Low Energy Controller <bluetooth-ctlr-arch>` (LE Link Layer)

  * Unlimited role and connection count, all roles supported
  * All v5.3 specification features supported (except a few minor items)
  * Concurrent multi-protocol support ready
  * Intelligent scheduling of roles to minimize overlap
  * Portable design to any open Bluetooth LE radio, currently supports Nordic
    Semiconductor nRF52x and nRF53x SoC Series, as well as proprietary radios
  * Supports little and big endian architectures, and abstracts the hard
    real-time specifics so that they can be encapsulated in a hardware-specific
    module
  * Support for Controller (HCI) builds over different physical transports
  * Isochronous channels

* :ref:`Bluetooth Host <bluetooth_le_host>`

  * Generic Access Profile (GAP) with all possible LE roles

    * Peripheral & Central
    * Observer & Broadcaster
    * Multiple PHY support (2Mbit/s, Coded)
    * Extended Advertising
    * Periodic Advertising (including Sync Transfer)

  * GATT (Generic Attribute Profile)

    * Server (to be a sensor)
    * Client (to connect to sensors)
    * Enhanced ATT (EATT)
    * GATT Database Hash
    * GATT Multiple Notifications

  * Pairing support, including the Secure Connections feature from Bluetooth 4.2

  * Non-volatile storage support for permanent storage of Bluetooth-specific
    settings and data

  * Bluetooth Mesh support

    * Relay, Friend Node, Low-Power Node (LPN) and GATT Proxy features
    * Both Provisioning roles and bearers supported (PB-ADV & PB-GATT)
    * Foundation Models included
    * Highly configurable, fits as small as 16k RAM devices

  * Basic Bluetooth BR/EDR (Classic) support

    * Generic Access Profile (GAP)
    * Logical Link Control and Adaptation Protocol (L2CAP)
    * Serial Port emulation (RFCOMM protocol)
    * Service Discovery Protocol (SDP)

  * Clean HCI driver abstraction

    * 3-Wire (H:5) & 5-Wire (H:4) UART
    * SPI
    * Local controller support as a virtual HCI driver

  * Verified with multiple popular controllers
  * Isochronous channels
  * :ref:`LE Audio <bluetooth_le_audio_arch>`
