CONFIG_MCUMGR_BUF_SIZE

Size of each mcumgr buffer

Type: int

Help

The size, in bytes, of each mcumgr buffer.  This value must satisfy
the following relation:
MCUMGR_BUF_SIZE >= transport-specific-MTU + transport-overhead
In case when MCUMGR_SMP_SHELL is enabled this value should be set to
at least SHELL_BACKEND_DUMMY_BUF_SIZE + 32.

Defaults

• 1024 if UPDATEABLE_IMAGE_NUMBER > 1

• 2048 if MCUMGR_SMP_UDP

• 384

Kconfig definitions

At <nRF>/Kconfig.nrf:45

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:31 → <Zephyr>/modules/Kconfig:6 → <nRF>/doc/_build/kconfig/Kconfig.modules:2

Menu path: (Top) → Modules → nrf (/home/runner/work/sdk-nrf/sdk-nrf/ncs/nrf) → Nordic nRF Connect

config MCUMGR_BUF_SIZE
    int
    default 1024 if UPDATEABLE_IMAGE_NUMBER > 1

---

At <Zephyr>/subsys/mgmt/mcumgr/Kconfig:385

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:42 → <Zephyr>/subsys/Kconfig:35 → <Zephyr>/subsys/mgmt/Kconfig:9

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

config MCUMGR_BUF_SIZE
    int "Size of each mcumgr buffer"
    default 2048 if MCUMGR_SMP_UDP
    default 384
    depends on MCUMGR
    help
      The size, in bytes, of each mcumgr buffer.  This value must satisfy
      the following relation:
      MCUMGR_BUF_SIZE >= transport-specific-MTU + transport-overhead
      In case when MCUMGR_SMP_SHELL is enabled this value should be set to
      at least SHELL_BACKEND_DUMMY_BUF_SIZE + 32.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)