menu "LWIP" config LWIP_LOCAL_HOSTNAME string "Local netif hostname" default 'espressif' help The default name this device will report to other devices on the network. Could be updated at runtime with esp_netif_set_hostname() config LWIP_NETIF_API bool "Enable usage of standard POSIX APIs in LWIP" default n help If this feature is enabled, standard POSIX APIs: if_indextoname(), if_nametoindex() could be used to convert network interface index to name instead of IDF specific esp-netif APIs (such as esp_netif_get_netif_impl_name()) config LWIP_TCPIP_CORE_LOCKING bool "Enable tcpip　core locking" default n help If Enable tcpip　core locking,Creates a global mutex that is held during TCPIP thread operations.Can be locked by client code to perform lwIP operations without changing into TCPIP thread using callbacks. See LOCK_TCPIP_CORE() and UNLOCK_TCPIP_CORE(). If disable tcpip　core locking,TCP IP will perform tasks through context switching． config LWIP_DNS_SUPPORT_MDNS_QUERIES bool "Enable mDNS queries in resolving host name" default y help If this feature is enabled, standard API such as gethostbyname support .local addresses by sending one shot multicast mDNS query config LWIP_L2_TO_L3_COPY bool "Enable copy between Layer2 and Layer3 packets" default n 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_IRAM_OPTIMIZATION bool "Enable LWIP IRAM optimization" default n help If this feature is enabled, some functions relating to RX/TX in LWIP will be put into IRAM, it can improve UDP/TCP throughput by >10% for single core mode, it doesn't help too much for dual core mode. On the other hand, it needs about 10KB IRAM for these optimizations. If this feature is disabled, all lwip functions will be put into FLASH. config LWIP_TIMERS_ONDEMAND bool "Enable LWIP Timers on demand" default y help If this feature is enabled, IGMP and MLD6 timers will be activated only when joining groups or receiving QUERY packets. This feature will reduce the power consumption for applications which do not use IGMP and MLD6. config LWIP_MAX_SOCKETS int "Max number of open sockets" range 1 16 default 10 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_USE_ONLY_LWIP_SELECT bool "Support LWIP socket select() only (DEPRECATED)" default n help This option is deprecated. Use VFS_SUPPORT_SELECT instead, which is the inverse of this option. The virtual filesystem layer of select() redirects sockets to lwip_select() and non-socket file descriptors to their respective driver implementations. If this option is enabled then all calls of select() will be redirected to lwip_select(), therefore, select can be used for sockets only. config LWIP_SO_LINGER bool "Enable SO_LINGER processing" default n help Enabling this option allows SO_LINGER processing. l_onoff = 1,l_linger can set the timeout. If l_linger=0, When a connection is closed, TCP will terminate the connection. This means that TCP will discard any data packets stored in the socket send buffer and send an RST to the peer. If l_linger!=0,Then closesocket() calls to block the process until the remaining data packets has been sent or timed out. config LWIP_SO_REUSE bool "Enable SO_REUSEADDR option" default y help Enabling this option allows binding to a port which remains in TIME_WAIT. config LWIP_SO_REUSE_RXTOALL bool "SO_REUSEADDR copies broadcast/multicast to all matches" depends on LWIP_SO_REUSE default y help Enabling this option means that any incoming broadcast or multicast packet will be copied to all of the local sockets that it matches (may be more than one if SO_REUSEADDR is set on the socket.) This increases memory overhead as the packets need to be copied, however they are only copied per matching socket. You can safely disable it if you don't plan to receive broadcast or multicast traffic on more than one socket at a time. config LWIP_SO_RCVBUF bool "Enable SO_RCVBUF option" default n help Enabling this option allows checking for available data on a netconn. config LWIP_NETBUF_RECVINFO bool "Enable IP_PKTINFO option" default n help Enabling this option allows checking for the destination address of a received IPv4 Packet. config LWIP_IP4_FRAG bool "Enable fragment outgoing IP4 packets" default y help Enabling this option allows fragmenting outgoing IP4 packets if their size exceeds MTU. config LWIP_IP6_FRAG bool "Enable fragment outgoing IP6 packets" default y depends on LWIP_IPV6 help Enabling this option allows fragmenting outgoing IP6 packets if their size exceeds MTU. config LWIP_IP4_REASSEMBLY bool "Enable reassembly incoming fragmented IP4 packets" default n help Enabling this option allows reassemblying incoming fragmented IP4 packets. config LWIP_IP6_REASSEMBLY bool "Enable reassembly incoming fragmented IP6 packets" default n depends on LWIP_IPV6 help Enabling this option allows reassemblying incoming fragmented IP6 packets. config LWIP_IP_FORWARD bool "Enable IP forwarding" default n help Enabling this option allows packets forwarding across multiple interfaces. config LWIP_IPV4_NAPT bool "Enable NAT (new/experimental)" depends on LWIP_IP_FORWARD select LWIP_L2_TO_L3_COPY default n help Enabling this option allows Network Address and Port Translation. config LWIP_STATS bool "Enable LWIP statistics" default n help Enabling this option allows LWIP statistics config LWIP_ETHARP_TRUST_IP_MAC bool "Enable LWIP ARP trust" default n help Enabling this option allows ARP table to be updated. If this option is enabled, the incoming IP packets cause the ARP table to be updated with the source MAC and IP addresses supplied in the packet. You may want to disable this if you do not trust LAN peers to have the correct addresses, or as a limited approach to attempt to handle spoofing. If disabled, lwIP will need to make a new ARP request if the peer is not already in the ARP table, adding a little latency. The peer *is* in the ARP table if it requested our address before. Also notice that this slows down input processing of every IP packet! There are two known issues in real application if this feature is enabled: - The LAN peer may have bug to update the ARP table after the ARP entry is aged out. If the ARP entry on the LAN peer is aged out but failed to be updated, all IP packets sent from LWIP to the LAN peer will be dropped by LAN peer. - The LAN peer may not be trustful, the LAN peer may send IP packets to LWIP with two different MACs, but the same IP address. If this happens, the LWIP has problem to receive IP packets from LAN peer. So the recommendation is to disable this option. Here the LAN peer means the other side to which the ESP station or soft-AP is connected. config LWIP_ESP_GRATUITOUS_ARP bool "Send gratuitous ARP periodically" default y help 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. config LWIP_GARP_TMR_INTERVAL int "GARP timer interval(seconds)" default 60 depends on LWIP_ESP_GRATUITOUS_ARP help Set the timer interval for gratuitous ARP. The default value is 60s config LWIP_TCPIP_RECVMBOX_SIZE int "TCPIP task receive mail box size" default 32 range 6 64 if !LWIP_WND_SCALE range 6 1024 if LWIP_WND_SCALE help 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. config LWIP_DHCP_DOES_ARP_CHECK bool "DHCP: Perform ARP check on any offered address" default y help 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. config LWIP_DHCP_DISABLE_CLIENT_ID bool "DHCP: Disable Use of HW address as client identification" default n help 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. config LWIP_DHCP_DISABLE_VENDOR_CLASS_ID bool "DHCP: Disable Use of vendor class identification" default y help 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. config LWIP_DHCP_RESTORE_LAST_IP bool "DHCP: Restore last IP obtained from DHCP server" default n help 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. config LWIP_DHCP_OPTIONS_LEN int "DHCP total option length" default 68 if LWIP_DHCP_DISABLE_VENDOR_CLASS_ID default 108 if !LWIP_DHCP_DISABLE_VENDOR_CLASS_ID range 68 255 help 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. menu "DHCP server" config LWIP_DHCPS bool "DHCPS: Enable IPv4 Dynamic Host Configuration Protocol Server (DHCPS)" default y help Enabling this option allows the device to run the DHCP server (to dynamically assign IPv4 addresses to clients). config LWIP_DHCPS_LEASE_UNIT int "Multiplier for lease time, in seconds" range 1 3600 default 60 depends on LWIP_DHCPS help 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. config LWIP_DHCPS_MAX_STATION_NUM int "Maximum number of stations" range 1 64 default 8 depends on LWIP_DHCPS help The maximum number of DHCP clients that are connected to the server. After this number is exceeded, DHCP server removes of the oldest device from it's address pool, without notification. endmenu # DHCPS menuconfig LWIP_AUTOIP bool "Enable IPV4 Link-Local Addressing (AUTOIP)" default n help Enabling this option allows the device to self-assign an address in the 169.256/16 range if none is assigned statically or via DHCP. See RFC 3927. config LWIP_AUTOIP_TRIES int "DHCP Probes before self-assigning IPv4 LL address" range 1 100 default 2 depends on LWIP_AUTOIP help DHCP client will send this many probes before self-assigning a link local address. From LWIP help: "This can be set as low as 1 to get an AutoIP address very quickly, but you should be prepared to handle a changing IP address when DHCP overrides AutoIP." (In the case of ESP-IDF, this means multiple SYSTEM_EVENT_STA_GOT_IP events.) config LWIP_AUTOIP_MAX_CONFLICTS int "Max IP conflicts before rate limiting" range 1 100 default 9 depends on LWIP_AUTOIP help If the AUTOIP functionality detects this many IP conflicts while self-assigning an address, it will go into a rate limited mode. config LWIP_AUTOIP_RATE_LIMIT_INTERVAL int "Rate limited interval (seconds)" range 5 120 default 20 depends on LWIP_AUTOIP help If rate limiting self-assignment requests, wait this long between each request. config LWIP_IPV6 bool "Enable IPv6" default y help Enable IPv6 function. If not use IPv6 function, set this option to n. If disabling LWIP_IPV6 then some other components (coap and asio) will no longer be available. config LWIP_IPV6_AUTOCONFIG bool "Enable IPV6 stateless address autoconfiguration (SLAAC)" depends on LWIP_IPV6 default n help Enabling this option allows the devices to IPV6 stateless address autoconfiguration (SLAAC). See RFC 4862. config LWIP_IPV6_NUM_ADDRESSES int "Number of IPv6 addresses on each network interface" depends on LWIP_IPV6 default 3 help The maximum number of IPv6 addresses on each interface. Any additional addresses will be discarded. config LWIP_IPV6_FORWARD bool "Enable IPv6 forwarding between interfaces" depends on LWIP_IPV6 default n help Forwarding IPv6 packets between interfaces is only required when acting as a router. config LWIP_IPV6_RDNSS_MAX_DNS_SERVERS int "Use IPv6 Router Advertisement Recursive DNS Server Option" depends on LWIP_IPV6_AUTOCONFIG default 0 help Use IPv6 Router Advertisement Recursive DNS Server Option (as per RFC 6106) to copy a defined maximum number of DNS servers to the DNS module. Set this option to a number of desired DNS servers advertised in the RA protocol. This feature is disabled when set to 0. config LWIP_IPV6_DHCP6 bool "Enable DHCPv6 stateless address autoconfiguration" depends on LWIP_IPV6_AUTOCONFIG default n help Enable DHCPv6 for IPv6 stateless address autoconfiguration. Note that the dhcpv6 client has to be started using dhcp6_enable_stateless(netif); Note that the stateful address autoconfiguration is not supported. config LWIP_NETIF_STATUS_CALLBACK bool "Enable status callback for network interfaces" default n help Enable callbacks when the network interface is up/down and addresses are changed. menuconfig LWIP_NETIF_LOOPBACK bool "Support per-interface loopback" default y help Enabling this option means that if a packet is sent with a destination address equal to the interface's own IP address, it will "loop back" and be received by this interface. config LWIP_LOOPBACK_MAX_PBUFS int "Max queued loopback packets per interface" range 0 16 default 8 depends on LWIP_NETIF_LOOPBACK help Configure the maximum number of packets which can be queued for loopback on a given interface. Reducing this number may cause packets to be dropped, but will avoid filling memory with queued packet data. menu "TCP" config LWIP_MAX_ACTIVE_TCP int "Maximum active TCP Connections" range 1 1024 default 16 help The maximum number of simultaneously active TCP connections. The practical maximum limit is determined by available heap memory at runtime. Changing this value by itself does not substantially change the memory usage of LWIP, except for preventing new TCP connections after the limit is reached. config LWIP_MAX_LISTENING_TCP int "Maximum listening TCP Connections" range 1 1024 default 16 help The maximum number of simultaneously listening TCP connections. The practical maximum limit is determined by available heap memory at runtime. Changing this value by itself does not substantially change the memory usage of LWIP, except for preventing new listening TCP connections after the limit is reached. config LWIP_TCP_HIGH_SPEED_RETRANSMISSION bool "TCP high speed retransmissions" default y help Speed up the TCP retransmission interval. If disabled, it is recommended to change the number of SYN retransmissions to 6, and TCP initial rto time to 3000. config LWIP_TCP_MAXRTX int "Maximum number of retransmissions of data segments" default 12 range 3 12 help Set maximum number of retransmissions of data segments. config LWIP_TCP_SYNMAXRTX int "Maximum number of retransmissions of SYN segments" default 6 if !LWIP_TCP_HIGH_SPEED_RETRANSMISSION default 12 if LWIP_TCP_HIGH_SPEED_RETRANSMISSION range 3 12 help Set maximum number of retransmissions of SYN segments. config LWIP_TCP_MSS int "Maximum Segment Size (MSS)" default 1440 range 536 1460 help Set maximum segment size for TCP transmission. Can be set lower to save RAM, the default value 1460(ipv4)/1440(ipv6) will give best throughput. IPv4 TCP_MSS Range: 576 <= TCP_MSS <= 1460 IPv6 TCP_MSS Range: 1220<= TCP_mSS <= 1440 config LWIP_TCP_TMR_INTERVAL int "TCP timer interval(ms)" default 250 help Set TCP timer interval in milliseconds. Can be used to speed connections on bad networks. A lower value will redeliver unacked packets faster. config LWIP_TCP_MSL int "Maximum segment lifetime (MSL)" default 60000 help Set maximum segment lifetime in in milliseconds. config LWIP_TCP_SND_BUF_DEFAULT int "Default send buffer size" default 5744 # 4 * default MSS range 2440 65535 if !LWIP_WND_SCALE range 2440 1024000 if LWIP_WND_SCALE help Set default send buffer size for new TCP sockets. Per-socket send buffer size can be changed at runtime with lwip_setsockopt(s, TCP_SNDBUF, ...). This value must be at least 2x the MSS size, and the default is 4x the default MSS size. Setting a smaller default SNDBUF size can save some RAM, but will decrease performance. config LWIP_TCP_WND_DEFAULT int "Default receive window size" default 5744 # 4 * default MSS range 2440 65535 if !LWIP_WND_SCALE range 2440 1024000 if LWIP_WND_SCALE help Set default TCP receive window size for new TCP sockets. Per-socket receive window size can be changed at runtime with lwip_setsockopt(s, TCP_WINDOW, ...). Setting a smaller default receive window size can save some RAM, but will significantly decrease performance. config LWIP_TCP_RECVMBOX_SIZE int "Default TCP receive mail box size" default 6 range 6 64 if !LWIP_WND_SCALE range 6 1024 if LWIP_WND_SCALE help Set TCP receive mail box size. Generally bigger value means higher throughput but more memory. The recommended value is: LWIP_TCP_WND_DEFAULT/TCP_MSS + 2, e.g. if LWIP_TCP_WND_DEFAULT=14360, TCP_MSS=1436, then the recommended receive mail box size is (14360/1436 + 2) = 12. TCP receive mail box is a per socket mail box, when the application receives packets from TCP socket, LWIP core firstly posts the packets to TCP receive mail box and the application then fetches the packets from mail box. It means LWIP can caches maximum LWIP_TCP_RECCVMBOX_SIZE packets for each TCP socket, so the maximum possible cached TCP packets for all TCP sockets is LWIP_TCP_RECCVMBOX_SIZE multiples the maximum TCP socket number. In other words, the bigger LWIP_TCP_RECVMBOX_SIZE means more memory. On the other hand, if the receiv mail box is too small, the mail box may be full. If the mail box is full, the LWIP drops the packets. So generally we need to make sure the TCP receive mail box is big enough to avoid packet drop between LWIP core and application. config LWIP_TCP_QUEUE_OOSEQ bool "Queue incoming out-of-order segments" default y help Queue incoming out-of-order segments for later use. Disable this option to save some RAM during TCP sessions, at the expense of increased retransmissions if segments arrive out of order. config LWIP_TCP_SACK_OUT bool "Support sending selective acknowledgements" default n help TCP will support sending selective acknowledgements (SACKs). config LWIP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES bool "Keep TCP connections when IP changed" default n help This option is enabled when the following scenario happen: network dropped and reconnected, IP changes is like: 192.168.0.2->0.0.0.0->192.168.0.2 Disable this option to keep consistent with the original LWIP code behavior. choice LWIP_TCP_OVERSIZE prompt "Pre-allocate transmit PBUF size" default LWIP_TCP_OVERSIZE_MSS help Allows enabling "oversize" allocation of TCP transmission pbufs ahead of time, which can reduce the length of pbuf chains used for transmission. This will not make a difference to sockets where Nagle's algorithm is disabled. Default value of MSS is fine for most applications, 25% MSS may save some RAM when only transmitting small amounts of data. Disabled will have worst performance and fragmentation characteristics, but uses least RAM overall. config LWIP_TCP_OVERSIZE_MSS bool "MSS" config LWIP_TCP_OVERSIZE_QUARTER_MSS bool "25% MSS" config LWIP_TCP_OVERSIZE_DISABLE bool "Disabled" endchoice config LWIP_WND_SCALE bool "Support TCP window scale" depends on SPIRAM_TRY_ALLOCATE_WIFI_LWIP default n help Enable this feature to support TCP window scaling. config LWIP_TCP_RCV_SCALE int "Set TCP receiving window scaling factor" depends on LWIP_WND_SCALE range 0 14 default 0 help Enable this feature to support TCP window scaling. config LWIP_TCP_RTO_TIME int "Default TCP rto time" default 3000 if !LWIP_TCP_HIGH_SPEED_RETRANSMISSION default 1500 if LWIP_TCP_HIGH_SPEED_RETRANSMISSION help Set default TCP rto time for a reasonable initial rto. In bad network environment, recommend set value of rto time to 1500. endmenu # TCP menu "UDP" config LWIP_MAX_UDP_PCBS int "Maximum active UDP control blocks" range 1 1024 default 16 help The maximum number of active UDP "connections" (ie UDP sockets sending/receiving data). The practical maximum limit is determined by available heap memory at runtime. config LWIP_UDP_RECVMBOX_SIZE int "Default UDP receive mail box size" default 6 range 6 64 help Set UDP receive mail box size. The recommended value is 6. UDP receive mail box is a per socket mail box, when the application receives packets from UDP socket, LWIP core firstly posts the packets to UDP receive mail box and the application then fetches the packets from mail box. It means LWIP can caches maximum UDP_RECCVMBOX_SIZE packets for each UDP socket, so the maximum possible cached UDP packets for all UDP sockets is UDP_RECCVMBOX_SIZE multiples the maximum UDP socket number. In other words, the bigger UDP_RECVMBOX_SIZE means more memory. On the other hand, if the receiv mail box is too small, the mail box may be full. If the mail box is full, the LWIP drops the packets. So generally we need to make sure the UDP receive mail box is big enough to avoid packet drop between LWIP core and application. endmenu # UDP menu "Checksums" config LWIP_CHECKSUM_CHECK_IP bool "Enable LWIP IP checksums" default n help Enable checksum checking for received IP messages config LWIP_CHECKSUM_CHECK_UDP bool "Enable LWIP UDP checksums" default n help Enable checksum checking for received UDP messages config LWIP_CHECKSUM_CHECK_ICMP bool "Enable LWIP ICMP checksums" default y help Enable checksum checking for received ICMP messages endmenu # Checksums config LWIP_TCPIP_TASK_STACK_SIZE int "TCP/IP Task Stack Size" default 3072 # for high log levels, tcpip_adapter API calls can end up # a few calls deep and logging there can trigger a stack overflow range 2048 65536 if LOG_DEFAULT_LEVEL < 4 range 2560 65536 if LOG_DEFAULT_LEVEL >= 4 help Configure TCP/IP task stack size, used by LWIP to process multi-threaded TCP/IP operations. Setting this stack too small will result in stack overflow crashes. choice LWIP_TCPIP_TASK_AFFINITY prompt "TCP/IP task affinity" default LWIP_TCPIP_TASK_AFFINITY_NO_AFFINITY help Allows setting LwIP tasks affinity, i.e. whether the task is pinned to CPU0, pinned to CPU1, or allowed to run on any CPU. Currently this applies to "TCP/IP" task and "Ping" task. config LWIP_TCPIP_TASK_AFFINITY_NO_AFFINITY bool "No affinity" config LWIP_TCPIP_TASK_AFFINITY_CPU0 bool "CPU0" config LWIP_TCPIP_TASK_AFFINITY_CPU1 bool "CPU1" depends on !FREERTOS_UNICORE endchoice config LWIP_TCPIP_TASK_AFFINITY hex default FREERTOS_NO_AFFINITY if LWIP_TCPIP_TASK_AFFINITY_NO_AFFINITY default 0x0 if LWIP_TCPIP_TASK_AFFINITY_CPU0 default 0x1 if LWIP_TCPIP_TASK_AFFINITY_CPU1 menuconfig LWIP_PPP_SUPPORT bool "Enable PPP support (new/experimental)" default n help Enable PPP stack. Now only PPP over serial is possible. PPP over serial support is experimental and unsupported. config LWIP_PPP_ENABLE_IPV6 bool "Enable IPV6 support for PPP connections (IPV6CP)" depends on LWIP_PPP_SUPPORT && LWIP_IPV6 default y help Enable IPV6 support in PPP for the local link between the DTE (processor) and DCE (modem). There are some modems which do not support the IPV6 addressing in the local link. If they are requested for IPV6CP negotiation, they may time out. This would in turn fail the configuration for the whole link. If your modem is not responding correctly to PPP Phase Network, try to disable IPV6 support. config LWIP_IPV6_MEMP_NUM_ND6_QUEUE int "Max number of IPv6 packets to queue during MAC resolution" depends on LWIP_IPV6 range 3 20 default 3 help Config max number of IPv6 packets to queue during MAC resolution. config LWIP_IPV6_ND6_NUM_NEIGHBORS int "Max number of entries in IPv6 neighbor cache" depends on LWIP_IPV6 range 3 10 default 5 help Config max number of entries in IPv6 neighbor cache config LWIP_PPP_NOTIFY_PHASE_SUPPORT bool "Enable Notify Phase Callback" depends on LWIP_PPP_SUPPORT default n help Enable to set a callback which is called on change of the internal PPP state machine. config LWIP_PPP_PAP_SUPPORT bool "Enable PAP support" depends on LWIP_PPP_SUPPORT default n help Enable Password Authentication Protocol (PAP) support config LWIP_PPP_CHAP_SUPPORT bool "Enable CHAP support" depends on LWIP_PPP_SUPPORT default n help Enable Challenge Handshake Authentication Protocol (CHAP) support config LWIP_PPP_MSCHAP_SUPPORT bool "Enable MSCHAP support" depends on LWIP_PPP_SUPPORT default n help Enable Microsoft version of the Challenge-Handshake Authentication Protocol (MSCHAP) support config LWIP_PPP_MPPE_SUPPORT bool "Enable MPPE support" depends on LWIP_PPP_SUPPORT default n help Enable Microsoft Point-to-Point Encryption (MPPE) support config LWIP_ENABLE_LCP_ECHO bool "Enable LCP ECHO" depends on LWIP_PPP_SUPPORT default n help Enable LCP echo keepalive requests config LWIP_LCP_ECHOINTERVAL int "Echo interval (s)" range 0 1000000 depends on LWIP_ENABLE_LCP_ECHO default 3 help Interval in seconds between keepalive LCP echo requests, 0 to disable. config LWIP_LCP_MAXECHOFAILS int "Maximum echo failures" range 0 100000 depends on LWIP_ENABLE_LCP_ECHO default 3 help Number of consecutive unanswered echo requests before failure is indicated. config LWIP_PPP_DEBUG_ON bool "Enable PPP debug log output" depends on LWIP_PPP_SUPPORT default n help Enable PPP debug log output menuconfig LWIP_SLIP_SUPPORT bool "Enable SLIP support (new/experimental)" default n help Enable SLIP stack. Now only SLIP over serial is possible. SLIP over serial support is experimental and unsupported. config LWIP_SLIP_DEBUG_ON bool "Enable SLIP debug log output" depends on LWIP_SLIP_SUPPORT default n help Enable SLIP debug log output menu "ICMP" config LWIP_ICMP bool "ICMP: Enable ICMP" default y help Enable ICMP module for check network stability config LWIP_MULTICAST_PING bool "Respond to multicast pings" default n depends on LWIP_ICMP6 || LWIP_ICMP config LWIP_BROADCAST_PING bool "Respond to broadcast pings" default n depends on LWIP_ICMP endmenu # ICMP menu "LWIP RAW API" config LWIP_MAX_RAW_PCBS int "Maximum LWIP RAW PCBs" range 1 1024 default 16 help The maximum number of simultaneously active LWIP RAW protocol control blocks. The practical maximum limit is determined by available heap memory at runtime. endmenu # LWIP RAW API menu "SNTP" config LWIP_SNTP_MAX_SERVERS int "Maximum number of NTP servers" default 1 range 1 16 help Set maximum number of NTP servers used by LwIP SNTP module. First argument of sntp_setserver/sntp_setservername functions is limited to this value. config LWIP_DHCP_GET_NTP_SRV bool "Request NTP servers from DHCP" default n help If enabled, LWIP will add 'NTP' to Parameter-Request Option sent via DHCP-request. DHCP server might reply with an NTP server address in option 42. SNTP callback for such replies should be set accordingly (see sntp_servermode_dhcp() func.) config LWIP_DHCP_MAX_NTP_SERVERS int "Maximum number of NTP servers aquired via DHCP" default 1 range 1 16 depends on LWIP_DHCP_GET_NTP_SRV help Set maximum number of NTP servers aquired via DHCP-offer. Should be less or equal to "Maximum number of NTP servers", any extra servers would be just ignored. config LWIP_SNTP_UPDATE_DELAY int "Request interval to update time (ms)" range 15000 4294967295 default 3600000 help This option allows you to set the time update period via SNTP. Default is 1 hour. Must not be below 15 seconds by specification. (SNTPv4 RFC 4330 enforces a minimum update time of 15 seconds). endmenu # SNTP config LWIP_ESP_LWIP_ASSERT bool "Enable LWIP ASSERT checks" default y depends on !COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE help Enable this option keeps LWIP assertion checks enabled. It is recommended to keep this option enabled. If asserts are disabled for the entire project, they are also disabled for LWIP and this option is ignored. menu "Hooks" choice LWIP_HOOK_TCP_ISN prompt "TCP ISN Hook" default LWIP_HOOK_TCP_ISN_DEFAULT help Enables to define a TCP ISN hook to randomize initial sequence number in TCP connection. The default TCP ISN algorithm used in IDF (standardized in RFC 6528) produces ISN by combining an MD5 of the new TCP id and a stable secret with the current time. This is because the lwIP implementation (`tcp_next_iss`) is not very strong, as it does not take into consideration any platform specific entropy source. Set to LWIP_HOOK_TCP_ISN_CUSTOM to provide custom implementation. Set to LWIP_HOOK_TCP_ISN_NONE to use lwIP implementation. config LWIP_HOOK_TCP_ISN_NONE bool "No hook declared" config LWIP_HOOK_TCP_ISN_DEFAULT bool "Default implementation" config LWIP_HOOK_TCP_ISN_CUSTOM bool "Custom implementation" endchoice choice LWIP_HOOK_IP6_ROUTE prompt "IPv6 route Hook" depends on LWIP_IPV6 default LWIP_HOOK_IP6_ROUTE_NONE help Enables custom IPv6 route hook. Setting this to "default" provides weak implementation stub that could be overwritten in application code. Setting this to "custom" provides hook's declaration only and expects the application to implement it. config LWIP_HOOK_IP6_ROUTE_NONE bool "No hook declared" config LWIP_HOOK_IP6_ROUTE_DEFAULT bool "Default (weak) implementation" config LWIP_HOOK_IP6_ROUTE_CUSTOM bool "Custom implementation" endchoice choice LWIP_HOOK_ND6_GET_GW prompt "IPv6 get gateway Hook" depends on LWIP_IPV6 default LWIP_HOOK_ND6_GET_GW_NONE help Enables custom IPv6 route hook. Setting this to "default" provides weak implementation stub that could be overwritten in application code. Setting this to "custom" provides hook's declaration only and expects the application to implement it. config LWIP_HOOK_ND6_GET_GW_NONE bool "No hook declared" config LWIP_HOOK_ND6_GET_GW_DEFAULT bool "Default (weak) implementation" config LWIP_HOOK_ND6_GET_GW_CUSTOM bool "Custom implementation" endchoice choice LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE prompt "Netconn external resolve Hook" default LWIP_HOOK_NETCONN_EXT_RESOLVE_NONE help Enables custom DNS resolve hook. Setting this to "default" provides weak implementation stub that could be overwritten in application code. Setting this to "custom" provides hook's declaration only and expects the application to implement it. config LWIP_HOOK_NETCONN_EXT_RESOLVE_NONE bool "No hook declared" config LWIP_HOOK_NETCONN_EXT_RESOLVE_DEFAULT bool "Default (weak) implementation" config LWIP_HOOK_NETCONN_EXT_RESOLVE_CUSTOM bool "Custom implementation" endchoice endmenu # Hooks menuconfig LWIP_DEBUG bool "Enable LWIP Debug" default n help Enabling this option allows different kinds of lwIP debug output. All lwIP debug features increase the size of the final binary. config LWIP_NETIF_DEBUG bool "Enable netif debug messages" depends on LWIP_DEBUG default n config LWIP_PBUF_DEBUG bool "Enable pbuf debug messages" depends on LWIP_DEBUG default n config LWIP_ETHARP_DEBUG bool "Enable etharp debug messages" depends on LWIP_DEBUG default n config LWIP_API_LIB_DEBUG bool "Enable api lib debug messages" depends on LWIP_DEBUG default n config LWIP_SOCKETS_DEBUG bool "Enable socket debug messages" depends on LWIP_DEBUG default n config LWIP_IP_DEBUG bool "Enable IP debug messages" depends on LWIP_DEBUG default n config LWIP_ICMP_DEBUG bool "Enable ICMP debug messages" depends on LWIP_DEBUG && LWIP_ICMP default n config LWIP_DHCP_STATE_DEBUG bool "Enable DHCP state tracking" depends on LWIP_DEBUG default n config LWIP_DHCP_DEBUG bool "Enable DHCP debug messages" depends on LWIP_DEBUG default n config LWIP_IP6_DEBUG bool "Enable IP6 debug messages" depends on LWIP_DEBUG default n config LWIP_ICMP6_DEBUG bool "Enable ICMP6 debug messages" depends on LWIP_DEBUG default n config LWIP_TCP_DEBUG bool "Enable TCP debug messages" depends on LWIP_DEBUG default n config LWIP_SNTP_DEBUG bool "Enable SNTP debug messages" depends on LWIP_DEBUG default n endmenu