:orphan:

.. title:: BT_CTLR_TX_BUFFER_SIZE

.. option:: CONFIG_BT_CTLR_TX_BUFFER_SIZE

*Tx buffer size*

Type: ``int``

Help
====

Size of the Tx buffers and the value returned in HCI LE Read Buffer
Size command response. If this size if greater than effective PDU size
then controller will perform fragmentation before transmitting on the
the packet on air.
Maximum is set to 251 due to implementation limitations (use of
uint8_t for length field in PDU buffer structure).

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

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

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

Default
=======

- 27

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

.. highlight:: kconfig

At ``subsys/bluetooth/controller/Kconfig:186``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:9`` → ``subsys/bluetooth/Kconfig:240``

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

.. parsed-literal::

    config BT_CTLR_TX_BUFFER_SIZE
    	int "Tx buffer size"
    	range 27 251
    	default 27
    	depends on \ :option:`BT_CTLR <CONFIG_BT_CTLR>` && \ :option:`BT_HCI <CONFIG_BT_HCI>` && \ :option:`BT <CONFIG_BT>`
    	help
    	  Size of the Tx buffers and the value returned in HCI LE Read Buffer
    	  Size command response. If this size if greater than effective PDU size
    	  then controller will perform fragmentation before transmitting on the
    	  the packet on air.
    	  Maximum is set to 251 due to implementation limitations (use of
    	  uint8_t for length field in PDU buffer structure).

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