:orphan:

.. title:: CONFIG_MCUMGR_BUF_USER_DATA_SIZE

.. kconfig:: CONFIG_MCUMGR_BUF_USER_DATA_SIZE

CONFIG_MCUMGR_BUF_USER_DATA_SIZE
################################

*Size of mcumgr buffer user data*

Type: ``int``

Help
====

.. code-block:: none

    The size, in bytes, of user data to allocate for each mcumgr buffer.

    Different mcumgr transports impose different requirements for this
    setting. A value of 4 is sufficient for UART, shell, and bluetooth.
    For UDP, the userdata must be large enough to hold a IPv4/IPv6 address.

    Note that CONFIG_NET_BUF_USER_DATA_SIZE must be at least as big as
    MCUMGR_BUF_USER_DATA_SIZE.

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

\ :kconfig:`MCUMGR <CONFIG_MCUMGR>`

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

Defaults
========

- 24 if \ :kconfig:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :kconfig:`MCUMGR_SMP_UDP_IPV6 <CONFIG_MCUMGR_SMP_UDP_IPV6>`
- 8 if \ :kconfig:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :kconfig:`MCUMGR_SMP_UDP_IPV4 <CONFIG_MCUMGR_SMP_UDP_IPV4>`
- 4

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



At ``<Zephyr Subsystem>/mgmt/mcumgr/Kconfig:424``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:44`` → ``<Zephyr Subsystem>/Kconfig:35`` → ``<Zephyr Subsystem>/mgmt/Kconfig:9``

Menu path: (Top) → Sub Systems and OS Services → Device Management → mcumgr Support

.. code-block:: kconfig

    config MCUMGR_BUF_USER_DATA_SIZE
    	int "Size of mcumgr buffer user data"
    	default 24 if MCUMGR_SMP_UDP && MCUMGR_SMP_UDP_IPV6
    	default 8 if MCUMGR_SMP_UDP && MCUMGR_SMP_UDP_IPV4
    	default 4
    	depends on MCUMGR
    	help
    	  The size, in bytes, of user data to allocate for each mcumgr buffer.
	  
    	  Different mcumgr transports impose different requirements for this
    	  setting. A value of 4 is sufficient for UART, shell, and bluetooth.
    	  For UDP, the userdata must be large enough to hold a IPv4/IPv6 address.
	  
    	  Note that CONFIG_NET_BUF_USER_DATA_SIZE must be at least as big as
    	  MCUMGR_BUF_USER_DATA_SIZE.

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