:orphan:

.. title:: MCUMGR_SMP_UDP_MTU

.. option:: CONFIG_MCUMGR_SMP_UDP_MTU

*UDP SMP MTU*

Type: ``int``

Help
====

Maximum size of SMP frames sent and received over UDP, in bytes.
This value must satisfy the following relation:
MCUMGR_SMP_UDP_MTU <= MCUMGR_BUF_SIZE + SMP msg overhead - address size
where address size is determined by IPv4/IPv6 selection.

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

\ :option:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :option:`MCUMGR <CONFIG_MCUMGR>`

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

Default
=======

- 1500

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

.. highlight:: kconfig

At ``subsys/mgmt/mcumgr/Kconfig:333``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:35`` → ``subsys/mgmt/Kconfig:9``

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

.. parsed-literal::

    config MCUMGR_SMP_UDP_MTU
    	int "UDP SMP MTU"
    	default 1500
    	depends on \ :option:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :option:`MCUMGR <CONFIG_MCUMGR>`
    	help
    	  Maximum size of SMP frames sent and received over UDP, in bytes.
    	  This value must satisfy the following relation:
    	  MCUMGR_SMP_UDP_MTU <= MCUMGR_BUF_SIZE + SMP msg overhead - address size
    	  where address size is determined by IPv4/IPv6 selection.

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