:orphan:

.. title:: BT_RX_BUF_LEN

.. option:: CONFIG_BT_RX_BUF_LEN

*Maximum supported HCI RX buffer length*

Type: ``int``

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.

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

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

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

Defaults
========

- 264 if \ :option:`BT_BREDR <CONFIG_BT_BREDR>`
- 258 if \ :option:`BT_EXT_ADV <CONFIG_BT_EXT_ADV>`
- 77 if \ :option:`BT_MESH_PROXY <CONFIG_BT_MESH_PROXY>`
- 76

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

.. highlight:: kconfig

At ``subsys/bluetooth/host/Kconfig:34``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:9`` → ``subsys/bluetooth/Kconfig:239``

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

.. parsed-literal::

    config BT_RX_BUF_LEN
    	int "Maximum supported HCI RX buffer length"
    	range 73 2000
    	default 264 if \ :option:`BT_BREDR <CONFIG_BT_BREDR>`
    	default 258 if \ :option:`BT_EXT_ADV <CONFIG_BT_EXT_ADV>`
    	default 77 if \ :option:`BT_MESH_PROXY <CONFIG_BT_MESH_PROXY>`
    	default 76
    	depends on \ :option:`BT_HCI <CONFIG_BT_HCI>` && \ :option:`BT <CONFIG_BT>`
    	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.

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