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# Kconfig - Bluetooth LE stack configuration options
#
# Copyright (c) 2016-2017 Nordic Semiconductor ASA
# Copyright (c) 2015-2016 Intel Corporation
#
# SPDX-License-Identifier: Apache-2.0
#
comment "Host Stack Configuration"
config BT_HCI_HOST
# Virtual/hidden option to make the conditions more intuitive
bool
default y
depends on !BT_HCI_RAW
select POLL
config BT_HCI_CMD_COUNT
int "Number of HCI command buffers"
default 2
range 2 64
help
Number of buffers available for HCI commands.
config BT_RX_BUF_COUNT
int "Number of HCI RX buffers"
default 10
default 3 if BT_RECV_IS_RX_THREAD
range 2 255
help
Number of buffers available for incoming ACL packets or HCI events
from the controller.
config BT_RX_BUF_LEN
int "Maximum supported HCI RX buffer length"
default 76
default 77 if BT_MESH_PROXY
default 264 if BT_BREDR
range 73 2000
help
Maximum data size for each HCI RX buffer. This size includes
everything starting with the ACL or HCI event headers. Note that
buffer sizes are always rounded up to the nearest multiple of 4,
so if this Kconfig value is something else then there will be some
wasted space. The minimum of 73 has been taken for LE SC which has
an L2CAP MTU of 65 bytes. On top of this there's the L2CAP header
(4 bytes) and the ACL header (also 4 bytes) which yields 73 bytes.
config BT_HCI_TX_STACK_SIZE
# Stack size needed for executing bt_send with specified driver
int
# Even if no driver is selected the following default is still
# needed e.g. for unit tests.
default 256
default 256 if BT_H4
default 256 if BT_H5
default 416 if BT_SPI
default 640 if BT_CTLR
config BT_HCI_TX_PRIO
# Hidden option for Co-Operative Tx thread priority
int
default 7
config BT_WAIT_NOP
bool "Wait for \"NOP\" Command Complete event during init"
depends on BT_HCI
help
Some controllers emit a Command Complete event for the NOP
opcode to indicate that they're ready to receive commands.
This option should be selected if the controller used
exhibits such behavior.
# Headroom that the driver needs for sending and receiving buffers.
# Add a new 'default' entry for each new driver.
config BT_HCI_RESERVE
int
# Even if no driver is selected the following default is still
# needed e.g. for unit tests.
default 0
default 0 if BT_H4
default 1 if BT_H5
default 1 if BT_SPI
config BT_RECV_IS_RX_THREAD
# Virtual option set by the HCI driver to indicate that there's
# no need for the host to have its own RX thread, rather the
# context that bt_recv() gets called in is already good enough.
# If this is set, the driver RX thread is required as the first
# thing to make a call to bt_rx_thread_ready().
bool
config BT_RX_STACK_SIZE
int "Size of the receiving thread stack"
depends on BT_HCI_HOST || BT_RECV_IS_RX_THREAD
default 1024
default 2048 if BT_MESH
default 512 if BT_HCI_RAW
range 512 65536 if BT_HCI_RAW
range 1100 65536 if BT_MESH
range 1024 65536
help
Size of the receiving thread stack. This is the context from
which all event callbacks to the application occur. The
default value is sufficient for basic operation, but if the
application needs to do advanced things in its callbacks that
require extra stack space, this value can be increased to
accommodate for that.
config BT_RX_PRIO
# Hidden option for Co-Operative Rx thread priority
int
depends on BT_HCI_HOST || BT_RECV_IS_RX_THREAD
default 8
if BT_HCI_HOST
source "subsys/bluetooth/host/mesh/Kconfig"
config BT_HOST_CRYPTO
# Hidden option that compiles in random number generation and AES
# encryption support using TinyCrypt library if software-based
# controller is disabled.
bool
default y if !BT_CTLR
select TINYCRYPT
select TINYCRYPT_AES
select TINYCRYPT_SHA256
select TINYCRYPT_SHA256_HMAC
select TINYCRYPT_SHA256_HMAC_PRNG
config BT_INTERNAL_STORAGE
bool "Use an internal persistent storage handler"
depends on FILE_SYSTEM
depends on PRINTK
help
When selected the application doesn't need to register its own
persistent storage handlers through the bt_storage API, rather
an internal default handler is used for this.
if BT_CONN
if BT_HCI_ACL_FLOW_CONTROL
config BT_ACL_RX_COUNT
int "Number of incoming ACL data buffers"
default 6
default BT_CTLR_RX_BUFFERS if BT_CTLR
range 2 64
help
Number of buffers available for incoming ACL data.
config BT_L2CAP_RX_MTU
int "Maximum supported L2CAP MTU for incoming data"
default 23
default 65 if BT_SMP
default 200 if BT_BREDR
range 23 1300
range 65 1300 if BT_SMP
help
Maximum size of each incoming L2CAP PDU.
endif # BT_HCI_ACL_FLOW_CONTROL
config BT_L2CAP_TX_BUF_COUNT
int "Number of L2CAP TX buffers"
default 3
range 2 255
help
Number of buffers available for outgoing L2CAP packets.
config BT_L2CAP_TX_FRAG_COUNT
int "Number of L2CAP TX fragment buffers"
default 2
range 0 255
help
Number of buffers available for fragments of TX buffers. Warning:
setting this to 0 means that the application must ensure that
queued TX buffers never need to be fragmented, i.e. that the
controller's buffer size is large enough. If this is not ensured,
and there are no dedicated fragment buffers, a deadlock may occur.
In most cases the default value of 2 is a safe bet.
config BT_L2CAP_TX_MTU
int "Maximum supported L2CAP MTU for L2CAP TX buffers"
default 23
default 65 if BT_SMP
default 253 if BT_BREDR
range 23 2000
range 65 2000 if BT_SMP
help
Maximum L2CAP MTU for L2CAP TX buffers.
config BT_CONN_TX_MAX
int "Maximum number of pending TX buffers"
default 7
default BT_CTLR_TX_BUFFERS if BT_CTLR
range 1 128
help
Maximum number of pending TX buffers that have not yet
been acknowledged by the controller.
config BT_ATT_ENFORCE_FLOW
bool "Enforce strict flow control semantics for incoming PDUs"
default y
default n if BOARD_QEMU_CORTEX_M3 || BOARD_QEMU_X86
help
Enforce flow control rules on incoming PDUs, preventing a peer
from sending new requests until a previous one has been responded
or sending a new indication until a previous one has been
confirmed. This may need to be disabled to avoid potential race
conditions arising from a USB based HCI transport that splits
HCI events and ACL data to separate endpoints.
config BT_ATT_PREPARE_COUNT
int "Number of ATT prepare write buffers"
default 0
range 0 64
help
Number of buffers available for ATT prepare write, setting
this to 0 disables GATT long/reliable writes.
config BT_ATT_TX_MAX
int "Maximum number of queued outgoing ATT PDUs"
default 2
range 1 BT_L2CAP_TX_BUF_COUNT
help
Number of ATT PDUs that can be at a single moment queued for
transmission. If the application tries to send more than this
amount the calls will block until an existing queued PDU gets
sent.
config BT_SMP
bool "Security Manager Protocol support"
select TINYCRYPT
select TINYCRYPT_AES
select TINYCRYPT_AES_CMAC
select BT_RPA
help
This option enables support for the Security Manager Protocol
(SMP), making it possible to pair devices over LE.
if BT_SMP
config BT_PRIVACY
bool "Privacy Feature"
help
Enable local Privacy Feature support. This makes it possible
to use Resolvable Private Addresses (RPAs).
config BT_RPA_TIMEOUT
int "Resolvable Private Address timeout"
depends on BT_PRIVACY
default 900
range 1 65535
help
This option defines how often resolvable private address is rotated.
Value is provided in seconds and defaults to 900 seconds (15 minutes).
config BT_SIGNING
bool "Data signing support"
help
This option enables data signing which is used for transferring
authenticated data in an unencrypted connection.
config BT_SMP_SC_ONLY
bool "Secure Connections Only Mode"
help
This option enables support for Secure Connection Only Mode. In this
mode device shall only use Security Mode 1 Level 4 with exception
for services that only require Security Mode 1 Level 1 (no security).
Security Mode 1 Level 4 stands for authenticated LE Secure Connections
pairing with encryption. Enabling this option disables legacy pairing.
config BT_USE_DEBUG_KEYS
bool "Enable Security Manager Debug Mode"
depends on BT_TINYCRYPT_ECC
help
This option places Security Manager in a Debug Mode. In this mode
predefined Diffie-Hellman private/public key pair is used as described
in Core Specification Vol. 3, Part H, 2.3.5.6.1. This option should
only be enabled for debugging and should never be used in production.
If this option is enabled anyone is able to decipher encrypted air
traffic.
endif # BT_SMP
config BT_L2CAP_DYNAMIC_CHANNEL
bool "L2CAP Dynamic Channel support"
depends on BT_SMP
help
This option enables support for LE Connection oriented Channels,
allowing the creation of dynamic L2CAP Channels.
config BT_GATT_CLIENT
bool "GATT client support"
help
This option enables support for the GATT Client role.
config BT_MAX_PAIRED
int "Maximum number of paired devices"
default 1
default 0 if !BT_SMP
range 0 128
help
Maximum number of paired Bluetooth devices. The minimum (and
default) number is 1.
endif # BT_CONN
config BT_SCAN_WITH_IDENTITY
bool "Perform active scanning using local identity address"
depends on !BT_PRIVACY && (BT_CENTRAL || BT_OBSERVER)
help
Enable this if you want to perform active scanning using the local
identity address as the scanner address. By default the stack will
always use a non-resolvable private address (NRPA) in order to avoid
disclosing local identity information. However, if the use case
requires disclosing it then enable this option.
config BT_DEVICE_NAME
string "Bluetooth device name"
default "Zephyr"
help
Bluetooth device name. Name can be up to 248 bytes long (excluding
NULL termination). Can be empty string.
config BT_DEVICE_APPEARANCE
int "Bluetooth device appearance"
range 0 65535
default 0
help
Bluetooth device appearance. For the list of possible values please
consult the following link:
https://www.bluetooth.com/specifications/assigned-numbers
endif # BT_HCI_HOST
config BT_TINYCRYPT_ECC
bool "Use TinyCrypt library for ECDH"
select TINYCRYPT
select TINYCRYPT_ECC_DH
depends on BT_HCI_RAW || BT_HCI_HOST
help
If this option is set TinyCrypt library is used for emulating the
ECDH HCI commands and events needed by e.g. LE Secure Connections.
In builds including the BLE Host, if not set the controller crypto is
used for ECDH and if the controller doesn't support the required HCI
commands the LE Secure Connections support will be disabled.
In builds including the HCI Raw interface and the BLE Controller, this
option injects support for the 2 HCI commands required for LE Secure
Connections so that Hosts can make use of those.
if BT_DEBUG
config BT_DEBUG_HCI_CORE
bool "Bluetooth HCI core debug"
help
This option enables debug support for Bluetooth HCI
core.
config BT_DEBUG_CONN
bool "Bluetooth connection debug"
depends on BT_CONN
help
This option enables debug support for Bluetooth
connection handling.
config BT_DEBUG_KEYS
bool "Bluetooth security keys debug"
depends on BT_HCI_HOST
depends on BT_SMP
help
This option enables debug support for the handling of
Bluetooth security keys.
config BT_DEBUG_L2CAP
bool "Bluetooth L2CAP debug"
depends on BT_CONN
help
This option enables debug support for the Bluetooth
L2ACP layer.
config BT_DEBUG_SMP
bool "Bluetooth Security Manager Protocol (SMP) debug"
depends on BT_HCI_HOST
depends on BT_SMP
help
This option enables debug support for the Bluetooth
Security Manager Protocol (SMP).
config BT_SMP_SELFTEST
bool "Bluetooth SMP self tests executed on init"
depends on BT_DEBUG_SMP
help
This option enables SMP self-tests executed on startup
to verify security and crypto functions.
config BT_SMP_FORCE_BREDR
bool "Force Bluetooth SMP over BR/EDR"
depends on BT_DEBUG_SMP
help
This option enables SMP over BR/EDR even if controller is not
supporting BR/EDR Secure Connections. This option is solely for
testing and should never be enabled on production devices.
config BT_DEBUG_ATT
bool "Bluetooth Attribute Protocol (ATT) debug"
depends on BT_CONN
help
This option enables debug support for the Bluetooth
Attribute Protocol (ATT).
config BT_DEBUG_GATT
bool "Bluetooth Generic Attribute Profile (GATT) debug"
depends on BT_CONN
help
This option enables debug support for the Bluetooth
Generic Attribute Profile (GATT).
config BT_DEBUG_RFCOMM
bool "Bluetooth RFCOMM debug"
depends on BT_RFCOMM
help
This option enables debug support for the Bluetooth
RFCOMM layer.
config BT_DEBUG_HFP_HF
bool "Bluetooth Hands Free Profile (HFP) debug"
depends on BT_HFP_HF
help
This option enables debug support for the Bluetooth
Hands Free Profile (HFP).
config BT_DEBUG_AVDTP
bool "Bluetooth AVDTP debug"
depends on BT_AVDTP
help
This option enables debug support for the Bluetooth AVDTP.
config BT_DEBUG_A2DP
bool "Bluetooth A2DP debug"
depends on BT_A2DP
help
This option enables debug support for the Bluetooth
A2DP profile.
config BT_DEBUG_SDP
bool "Bluetooth Service Discovery Protocol (SDP) debug"
depends on BT_BREDR
help
This option enables debug support for the Bluetooth
Service Discovery Protocol (SDP).
endif # BT_DEBUG
config BT_TESTING
bool "Bluetooth Testing"
help
This option enables custom Bluetooth testing interface.
Shall only be used for testing purposes.
config BT_BREDR
bool "Bluetooth BR/EDR support [EXPERIMENTAL]"
depends on BT_HCI_HOST
select BT_PERIPHERAL
select BT_CENTRAL
select BT_SMP
select BT_L2CAP_DYNAMIC_CHANNEL
help
This option enables Bluetooth BR/EDR support
if BT_BREDR
config BT_MAX_SCO_CONN
int "Maximum number of simultaneous SCO connections"
default 1
range 1 3
help
Maximum number of simultaneous Bluetooth synchronous connections
supported. The minimum (and default) number is 1.
config BT_RFCOMM
bool "Bluetooth RFCOMM protocol support [EXPERIMENTAL]"
help
This option enables Bluetooth RFCOMM support
config BT_RFCOMM_L2CAP_MTU
int "L2CAP MTU for RFCOMM frames"
default BT_RX_BUF_LEN
default BT_L2CAP_RX_MTU if BT_HCI_ACL_FLOW_CONTROL
depends on BT_RFCOMM
range BT_RX_BUF_LEN 32767
range BT_L2CAP_RX_MTU 32767 if BT_HCI_ACL_FLOW_CONTROL
help
Maximum size of L2CAP PDU for RFCOMM frames.
config BT_HFP_HF
bool "Bluetooth Handsfree profile HF Role support [EXPERIMENTAL]"
depends on PRINTK
select BT_RFCOMM
help
This option enables Bluetooth HF support
config BT_AVDTP
bool "Bluetooth AVDTP protocol support [EXPERIMENTAL]"
help
This option enables Bluetooth AVDTP support
config BT_A2DP
bool "Bluetooth A2DP Profile [EXPERIMENTAL]"
select BT_AVDTP
help
This option enables the A2DP profile
config BT_PAGE_TIMEOUT
hex "Bluetooth Page Timeout"
default 0x2000
range 0x0001 0xffff
help
This option sets the page timeout value. Value is selected as
(N * 0.625) ms.
endif # BT_BREDR