:orphan:

.. title:: CONFIG_BT_BUF_CMD_TX_SIZE

.. kconfig:: CONFIG_BT_BUF_CMD_TX_SIZE

CONFIG_BT_BUF_CMD_TX_SIZE
#########################

*Maximum support HCI Command buffer length*

Type: ``int``

Help
====

.. code-block:: none

    Maximum data size for each HCI Command buffer. This value does not
    include the HCI Command header.
    This value is used by both the Host and the Controller for buffer
    sizes that include HCI commands. It should be set according to the
    expected HCI commands that can be sent from the configuration.
    If the subset of possible HCI commands is unknown, this should be set
    to the maximum of 255.

Direct dependencies
===================

\ :kconfig:`BT_HCI <CONFIG_BT_HCI>` && \ :kconfig:`BT <CONFIG_BT>`

*(Includes any dependencies from ifs and menus.)*

Defaults
========

- 255 if \ :kconfig:`BT_EXT_ADV <CONFIG_BT_EXT_ADV>` || \ :kconfig:`BT_BREDR <CONFIG_BT_BREDR>`
- 83 if !\ :kconfig:`BT_EXT_ADV <CONFIG_BT_EXT_ADV>` && !\ :kconfig:`BT_BREDR <CONFIG_BT_BREDR>` && \ :kconfig:`BT_CTLR_DF <CONFIG_BT_CTLR_DF>` && \ :kconfig:`BT_CTLR_DF_CONN_CTE_REQ <CONFIG_BT_CTLR_DF_CONN_CTE_REQ>` && !\ :kconfig:`SOC_COMPATIBLE_NRF <CONFIG_SOC_COMPATIBLE_NRF>`
- 65

Kconfig definition
==================



At ``<Zephyr Subsystem>/bluetooth/common/Kconfig:165``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:44`` → ``<Zephyr Subsystem>/Kconfig:9`` → ``<Zephyr Subsystem>/bluetooth/Kconfig:173``

Menu path: (Top) → Sub Systems and OS Services → Bluetooth

.. code-block:: kconfig

    config BT_BUF_CMD_TX_SIZE
    	int "Maximum support HCI Command buffer length"
    	range 65 255
    	default 255 if BT_EXT_ADV || BT_BREDR
    	default 83 if !BT_EXT_ADV && !BT_BREDR && BT_CTLR_DF && BT_CTLR_DF_CONN_CTE_REQ && !SOC_COMPATIBLE_NRF
    	default 65
    	depends on BT_HCI && BT
    	help
    	  Maximum data size for each HCI Command buffer. This value does not
    	  include the HCI Command header.
    	  This value is used by both the Host and the Controller for buffer
    	  sizes that include HCI commands. It should be set according to the
    	  expected HCI commands that can be sent from the configuration.
    	  If the subset of possible HCI commands is unknown, this should be set
    	  to the maximum of 255.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*