Espressif ESP32-S2 User Manual

Chapter 2. API Reference
CONFIG_LWIP_ESP_GRATUITOUS_ARP
Send gratuitous ARP periodically
Found in: Component config > LWIP
Enable this option allows to send gratuitous ARP periodically.
This option solve the compatibility issues.If the ARP table of the AP is old, and the AP doesn’t send
ARP request to update it’s ARP table, this will lead to the STA sending IP packet fail. Thus we send
gratuitous ARP periodically to let AP update it’s ARP table.
Default value:
• Yes (enabled)
CONFIG_LWIP_GARP_TMR_INTERVAL
GARP timer interval(seconds)
Found in: Component config > LWIP > CONFIG_LWIP_ESP_GRATUITOUS_ARP
Set the timer interval for gratuitous ARP. The default value is 60s
Default value:
• 60
CONFIG_LWIP_TCPIP_RECVMBOX_SIZE
TCPIP task receive mail box size
Found in: Component config > LWIP
Set TCPIP task receive mail box size. Generally bigger value means higher throughput but more memory.
The value should be bigger than UDP/TCP mail box size.
Range:
• from 6 to 64 if CONFIG_LWIP_WND_SCALE
• from 6 to 1024 if CONFIG_LWIP_WND_SCALE
Default value:
• 32
CONFIG_LWIP_DHCP_DOES_ARP_CHECK
DHCP: Perform ARP check on any offered address
Found in: Component config > LWIP
Enabling this option performs a check (via ARP request) if the offered IP address is not already in use
by another host on the network.
Default value:
• Yes (enabled)
CONFIG_LWIP_DHCP_DISABLE_CLIENT_ID
DHCP: Disable Use of HW address as client identification
Found in: Component config > LWIP
This option could be used to disable DHCP client identification with its MAC address. (Client id is used
by DHCP servers to uniquely identify clients and are included in the DHCP packets as an option 61) Set
this option to “y”in order to exclude option 61 from DHCP packets.
Default value:
• No (disabled)
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Release v4.4

Espressif ESP32-S2 Specifications

General

Brand	Espressif
Model	ESP32-S2
Category	Single board computers
Language	English