Espressif ESP32-S2 Programming Manual page 1176

Chapter 2. API Reference
CONFIG_LWIP_DHCP_DISABLE_VENDOR_CLASS_ID
DHCP: Disable Use of vendor class identification
Found in: Component config
This option could be used to disable DHCP client vendor class identification. Set this option to "y"in
order to exclude option 60 from DHCP packets.
Default value:
• Yes (enabled)
CONFIG_LWIP_DHCP_RESTORE_LAST_IP
DHCP: Restore last IP obtained from DHCP server
Found in: Component config
When this option is enabled, DHCP client tries to re-obtain last valid IP address obtained from DHCP
server. Last valid DHCP configuration is stored in nvs and restored after reset/power-up. If IP is still
available, there is no need for sending discovery message to DHCP server and save some time.
Default value:
• No (disabled)
CONFIG_LWIP_DHCP_OPTIONS_LEN
DHCP total option length
Found in: Component config
Set total length of outgoing DHCP option msg. Generally bigger value means it can carry more options
and values. If your code meets LWIP_ASSERT due to option value is too long. Please increase the
LWIP_DHCP_OPTIONS_LEN value.
Range:
• from 68 to 255
Default value:
• 68
• 108
DHCP server Contains:
• CONFIG_LWIP_DHCPS
CONFIG_LWIP_DHCPS
DHCPS: Enable IPv4 Dynamic Host Configuration Protocol Server (DHCPS)
Found in: Component config
Enabling this option allows the device to run the DHCP server (to dynamically assign IPv4 addresses to
clients).
Default value:
• Yes (enabled)
CONFIG_LWIP_DHCPS_LEASE_UNIT
Multiplier for lease time, in seconds
Found in: Component config
The DHCP server is calculating lease time multiplying the sent and received times by this number of
seconds per unit. The default is 60, that equals one minute.
Espressif Systems
> LWIP
> LWIP
> LWIP
> LWIP > DHCP server
> LWIP > DHCP server > CONFIG_LWIP_DHCPS
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