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.

Direct dependencies¶

MCUMGR

(Includes any dependencies from ifs and menus.)

Defaults¶

24 if MCUMGR_SMP_UDP && MCUMGR_SMP_UDP_IPV6
8 if MCUMGR_SMP_UDP && MCUMGR_SMP_UDP_IPV4
4

Kconfig definition¶

At <Zephyr>/subsys/mgmt/mcumgr/Kconfig:388

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:34 → <Zephyr>/subsys/Kconfig:32 → <Zephyr>/subsys/mgmt/Kconfig:9

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

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.)