CONFIG_LOG_BACKEND_NET_MAX_BUF_SIZE

Max syslog message size

Type: int

Help

As each syslog message needs to fit to UDP packet, set this value
so that messages are not truncated.
The RFC 5426 recommends that for IPv4 the size is 480 octets and for
IPv6 the size is 1180 octets. As each buffer will use RAM, the value
should be selected so that typical messages will fit the buffer.

Direct dependencies

LOG_BACKEND_NET && !LOG_FRONTEND && !LOG_MINIMAL && LOG

(Includes any dependencies from ifs and menus.)

Defaults

• 1180 if NET_IPV6

• 480 if NET_IPV4

• 256

Kconfig definition

At <Zephyr Subsystem>/logging/Kconfig.backends:262

Included via Kconfig:8 → Kconfig.zephyr:44 → <Zephyr Subsystem>/Kconfig:31 → <Zephyr Subsystem>/logging/Kconfig:23

Menu path: (Top) → Sub Systems and OS Services → Logging → Backends → Enable networking backend

config LOG_BACKEND_NET_MAX_BUF_SIZE
    int "Max syslog message size"
    range 64 1180
    default 1180 if NET_IPV6
    default 480 if NET_IPV4
    default 256
    depends on LOG_BACKEND_NET && !LOG_FRONTEND && !LOG_MINIMAL && LOG
    help
      As each syslog message needs to fit to UDP packet, set this value
      so that messages are not truncated.
      The RFC 5426 recommends that for IPv4 the size is 480 octets and for
      IPv6 the size is 1180 octets. As each buffer will use RAM, the value
      should be selected so that typical messages will fit the buffer.

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