== WIFI ==
https://github.com/espressif/esp-idf/tree/v5.2.3/examples/wifi/getting_started/station


== SOCKETS ==

https://pubs.opengroup.org/onlinepubs/007908799/xns/socket.html

// socket functions
https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/lwip.html#bsd-sockets-api

// socket options for setsocketopt()
https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/lwip.html#socket-options

// socket error handling
https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/lwip.html#socket-error-handling
    // error codes
    https://github.com/espressif/newlib-esp32/blob/master/newlib/libc/include/sys/errno.h

// sockets header file
https://github.com/espressif/esp-lwip/blob/6bc36ec/src/include/lwip/sockets.h


socket(address_family, type, protocol)
    Address Family:
        AF_INET // ipv4
        AF_INET6 // ipv6
        AF_UNSPEC // unspecified?
    Type:
        SOCK_STREAM // tcp
        SOCK_DGRAM // udp
        SOCK_RAW // raw
    Protocols:
        IPPROTO_IP
        IPPROTO_ICMP
        IPPROTO_TCP
        IPPROTO_UDP
        IPPROTO_IPV6
        IPPROTO_ICMPV6
        IPPROTO_UDPLITE
        IPPROTO_RAW

setsockopt(socket, level)
    Level:
        SOL_SOCKET
            SO_REUSEADDR // Allow local address reuse
            SO_KEEPALIVE // keep connections alive 
            SO_BROADCAST // permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option)
            SO_DEBUG        // Unimplemented: turn on debugging info recording 
            SO_ACCEPTCONN   // socket has had listen() 
            SO_DONTROUTE    // Unimplemented: just use interface addresses 
            SO_USELOOPBACK  // Unimplemented: bypass hardware when possible 
            SO_LINGER       // linger on close if data present 
            SO_DONTLINGER   ((int)(~SO_LINGER)) // ?
            SO_OOBINLINE    // Unimplemented: leave received OOB data in line 
            SO_REUSEPORT    // Unimplemented: allow local address & port reuse 
            SO_SNDBUF       // Unimplemented: send buffer size 
            SO_RCVBUF       // receive buffer size 
            SO_SNDLOWAT     // Unimplemented: send low-water mark 
            SO_RCVLOWAT     // Unimplemented: receive low-water mark 
            SO_SNDTIMEO     // send timeout 
            SO_RCVTIMEO     // receive timeout 
            SO_ERROR        // get error status and clear 
            SO_TYPE         // get socket type 
            SO_CONTIMEO     // Unimplemented: connect timeout 
            SO_NO_CHECK     // don't create UDP checksum 
            SO_BINDTODEVICE // bind to device 
        IPPROTO_IP
        IPPROTO_TCP
        IPPROTO_IPV6
        IPPROTO_UDPLITE




struct raw_pcb * raw_new        (u8_t proto);
err_t            raw_connect    (struct raw_pcb *pcb, const ip_addr_t *ipaddr);
void             raw_disconnect (struct raw_pcb *pcb);
err_t            raw_bind       (struct raw_pcb *pcb, const ip_addr_t *ipaddr);
err_t            raw_sendto     (struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr);
err_t            raw_send       (struct raw_pcb *pcb, struct pbuf *p);\
void             raw_recv       (struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg);



== DHCP ==
DHCP Starvation attack
Delilah's Fist

/* NETIF */
    // esp_netif_dhcps_option - Set or Get DHCP server option.
        https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/network/esp_netif.html?highlight=dhcp#_CPPv422esp_netif_dhcps_optionP11esp_netif_t28esp_netif_dhcp_option_mode_t26esp_netif_dhcp_option_id_tPv8uint32_t
    // esp_netif_dhcps_start - Start DHCP server (only if enabled in interface object)
        https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/network/esp_netif.html?highlight=dhcp#_CPPv421esp_netif_dhcps_startP11esp_netif_t
    // esp_netif_set_dns_info - Set DNS Server information (DHCP in this case)
        https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/network/esp_netif.html?highlight=dhcp#_CPPv422esp_netif_set_dns_infoP11esp_netif_t20esp_netif_dns_type_tP20esp_netif_dns_info_t

/* LWIP */
    // header file
    https://github.com/espressif/esp-idf/blob/6e5a178b3120dced7fa5c29c655cc22ea182df3d/components/lwip/include/apps/dhcpserver/dhcpserver.h

    // options
    https://github.com/espressif/esp-idf/blob/6e5a178b3120dced7fa5c29c655cc22ea182df3d/components/lwip/include/apps/dhcpserver/dhcpserver_options.h

    // source file
    https://github.com/espressif/esp-idf/blob/6e5a178b3120dced7fa5c29c655cc22ea182df3d/components/lwip/apps/dhcpserver/dhcpserver.c