esp-idf/components/lwip/Kconfig

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menu "LWIP"
config L2_TO_L3_COPY
bool "Enable copy between Layer2 and Layer3 packets"
default 0
help
If this feature is enabled, all traffic from layer2(WIFI Driver) will be
copied to a new buffer before sending it to layer3(LWIP stack), freeing
the layer2 buffer.
Please be notified that the total layer2 receiving buffer is fixed and
ESP32 currently supports 25 layer2 receiving buffer, when layer2 buffer
runs out of memory, then the incoming packets will be dropped in hardware.
The layer3 buffer is allocated from the heap, so the total layer3 receiving
buffer depends on the available heap size, when heap runs out of memory,
no copy will be sent to layer3 and packet will be dropped in layer2.
Please make sure you fully understand the impact of this feature before
enabling it.
config LWIP_MAX_SOCKETS
int "Max number of open sockets"
range 1 16
default 4
help
Sockets take up a certain amount of memory, and allowing fewer
sockets to be open at the same time conserves memory. Specify
the maximum amount of sockets here. The valid value is from 1
to 16.
config LWIP_THREAD_LOCAL_STORAGE_INDEX
int "Index for thread-local-storage pointer for lwip"
default 0
help
Specify the thread-local-storage-pointer index for lwip
use.
config LWIP_SO_REUSE
bool "Enable SO_REUSEADDR option"
default 0
help
Enabling this option allows binding to a port which remains in
TIME_WAIT.
config LWIP_DHCP_MAX_NTP_SERVERS
int "Maximum number of NTP servers"
default 1
range 1 16
help
Set maxumum number of NTP servers used by LwIP SNTP module.
First argument of sntp_setserver/sntp_setservername functions
is limited to this value.
endmenu