esp-idf/components/esp_netif/Kconfig

menu "ESP NETIF Adapter"

    config ESP_NETIF_IP_LOST_TIMER_INTERVAL
        int "IP Address lost timer interval (seconds)"
        range 0 65535
        default 120
        help
            The value of 0 indicates the IP lost timer is disabled, otherwise the timer is enabled.

            The IP address may be lost because of some reasons, e.g. when the station disconnects
            from soft-AP, or when DHCP IP renew fails etc. If the IP lost timer is enabled, it will
            be started everytime the IP is lost. Event SYSTEM_EVENT_STA_LOST_IP will be raised if
            the timer expires. The IP lost timer is stopped if the station get the IP again before
            the timer expires.

    choice ESP_NETIF_USE_TCPIP_STACK_LIB
        prompt "TCP/IP Stack Library"
        default ESP_NETIF_TCPIP_LWIP
        help
            Choose the TCP/IP Stack to work, for example, LwIP, uIP, etc.
        config ESP_NETIF_TCPIP_LWIP
            bool "LwIP"
            help
                lwIP is a small independent implementation of the TCP/IP protocol suite.

        config ESP_NETIF_LOOPBACK
            bool "Loopback"
            help
                Dummy implementation of esp-netif functionality which connects driver transmit
                to receive function. This option is for testing purpose only
    endchoice

    config ESP_NETIF_TCPIP_ADAPTER_COMPATIBLE_LAYER
        bool "Enable backward compatible tcpip_adapter interface"
        default y
        help
            Backward compatible interface to tcpip_adapter is enabled by default to support
            legacy TCP/IP stack initialisation code. Disable this option to use only esp-netif
            interface.

    config ESP_NETIF_L2_TAP
        bool "Enable netif L2 TAP support"
        help
            A user program can read/write link layer (L2) frames from/to ESP TAP device.
            The ESP TAP device can be currently associated only with Ethernet physical interfaces.

    config ESP_NETIF_L2_TAP_MAX_FDS
        depends on ESP_NETIF_L2_TAP
        int "Maximum number of opened L2 TAP File descriptors"
        range 1 10
        default 5
        help
            Maximum number of opened File descriptors (FD's) associated with ESP TAP device. ESP TAP FD's take up
            a certain amount of memory, and allowing fewer FD's to be opened at the same time conserves memory.

    config ESP_NETIF_L2_TAP_RX_QUEUE_SIZE
        depends on ESP_NETIF_L2_TAP
        int "Size of L2 TAP Rx queue"
        range 1 100
        default 20
        help
            Maximum number of frames queued in opened File descriptor. Once the queue is full, the newly arriving
            frames are dropped until the queue has enough room to accept incoming traffic (Tail Drop queue
            management).
endmenu