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esp-idf/components/lwip/Kconfig

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menu "LWIP"
config LWIP_ENABLE
bool "Enable LwIP stack"
default y if !IDF_TARGET_LINUX
default n if IDF_TARGET_LINUX
help
Builds normally if selected. Excludes LwIP from build if unselected, even if it is a
dependency of a component or application.
Some applications can switch their IP stacks, e.g., when switching between chip
and Linux targets (LwIP stack vs. Linux IP stack). Since the LwIP dependency cannot
easily be excluded based on a Kconfig option, it has to be a dependency in all cases.
This switch allows the LwIP stack to be built selectively, even if it is a dependency.
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_TASK_PRIO
int "LWIP TCP/IP Task Priority"
default 18
range 1 24
help
LWIP tcpip task priority. In case of high throughput, this parameter
could be changed up to (configMAX_PRIORITIES-1).
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_TCPIP_CORE_LOCKING_INPUT
bool "Enable tcpip core locking input"
depends on LWIP_TCPIP_CORE_LOCKING
default n
help
when LWIP_TCPIP_CORE_LOCKING is enabled, this lets tcpip_input() grab the
mutex for input packets as well, instead of allocating a message and passing
it to tcpip_thread.
config LWIP_CHECK_THREAD_SAFETY
bool "Checks that lwip API runs in expected context"
default n
help
Enable to check that the project does not violate lwip thread safety.
If enabled, all lwip functions that require thread awareness run an assertion
to verify that the TCP/IP core functionality is either locked or accessed
from the correct thread.
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_EXTRA_IRAM_OPTIMIZATION
bool "Enable LWIP IRAM optimization for TCP part"
default n
help
If this feature is enabled, some tcp part functions relating to RX/TX in LWIP will be
put into IRAM, it can improve TCP throughput. On the other hand, it needs about 17KB
IRAM for these optimizations.
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_ND6
bool "LWIP NDP6 Enable/Disable"
default y
depends on LWIP_IPV6
help
This option is used to disable the Network Discovery Protocol (NDP) if it is not required.
Please use this option with caution, as the NDP is essential for IPv6 functionality within a local network.
config LWIP_FORCE_ROUTER_FORWARDING
bool "LWIP Force Router Forwarding Enable/Disable"
default n
depends on LWIP_ND6
help
This option is used to set the the router flag for the NA packets.
When enabled, the router flag in NA packet will always set to 1,
otherwise, never set router flag for NA packets.
config LWIP_MAX_SOCKETS
int "Max number of open sockets"
range 1 253
default 10
help
The practical maximum limit is
determined by available heap memory at runtime.
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 253. If using value above 61, update CMakeLists defining
FD_SETSIZE to the number of sockets used plus the
expected open files (minimum of +3 for stdout, stderr and stdin).
config LWIP_USE_ONLY_LWIP_SELECT
bool "Support LWIP socket select() only (DEPRECATED)"
default n
help
This option is deprecated. Do not use this option, use VFS_SUPPORT_SELECT instead.
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_IP_DEFAULT_TTL
int "The value for Time-To-Live used by transport layers"
range 1 255
default 64
help
Set value for Time-To-Live used by transport layers.
config LWIP_IP4_FRAG
bool "Enable fragment outgoing IP4 packets"
default y
depends on LWIP_IPV4
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
depends on LWIP_IPV4
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_REASS_MAX_PBUFS
int "The maximum amount of pbufs waiting to be reassembled"
range 10 100
default 10
help
Set the maximum amount of pbufs waiting to be reassembled.
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"
depends on LWIP_IP_FORWARD
default n
help
Enabling this option allows Network Address and Port Translation.
config LWIP_IPV4_NAPT_PORTMAP
bool "Enable NAT Port Mapping"
depends on LWIP_IPV4_NAPT
default y
help
Enabling this option allows Port Forwarding or Port mapping.
config LWIP_STATS
bool "Enable LWIP statistics"
default n
help
Enabling this option allows LWIP statistics
config LWIP_ESP_GRATUITOUS_ARP
bool "Send gratuitous ARP periodically"
default y
depends on LWIP_IPV4
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_ESP_MLDV6_REPORT
bool "Send mldv6 report periodically"
depends on LWIP_IPV6
default y
help
Enable this option allows to send mldv6 report periodically.
This option solve the issue that failed to receive multicast data.
Some routers fail to forward multicast packets.
To solve this problem, send multicast mdlv6 report to routers regularly.
config LWIP_MLDV6_TMR_INTERVAL
int "mldv6 report timer interval(seconds)"
default 40
depends on LWIP_ESP_MLDV6_REPORT
help
Set the timer interval for mldv6 report. The default value is 30s
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
depends on LWIP_IPV4
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
depends on LWIP_IPV4
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
depends on LWIP_IPV4
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
depends on LWIP_IPV4
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
depends on LWIP_IPV4
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.
config LWIP_NUM_NETIF_CLIENT_DATA
int "Number of clients store data in netif"
default 0
range 0 256
help
Number of clients that may store data in client_data member array of struct netif.
config LWIP_DHCP_COARSE_TIMER_SECS
int "DHCP coarse timer interval(s)"
default 1
range 1 10
help
Set DHCP coarse interval in seconds.
A higher value will be less precise but cost less power consumption.
menu "DHCP server"
config LWIP_DHCPS
bool "DHCPS: Enable IPv4 Dynamic Host Configuration Protocol Server (DHCPS)"
default y
depends on LWIP_IPV4
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.
config LWIP_DHCPS_STATIC_ENTRIES
bool "Enable ARP static entries"
default y
depends on LWIP_DHCPS
help
Enabling this option allows DHCP server to support temporary static ARP entries
for DHCP Client. This will help the DHCP server to send the DHCP OFFER and DHCP ACK using IP unicast.
endmenu # DHCPS
menuconfig LWIP_AUTOIP
bool "Enable IPV4 Link-Local Addressing (AUTOIP)"
default n
depends on LWIP_IPV4
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_IPV4
bool "Enable IPv4"
default y
help
Enable IPv4 stack. If you want to use IPv6 only TCP/IP stack, disable this.
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 (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.
Disabling this option disables support of loopback interface in lwIP
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 milliseconds.
config LWIP_TCP_FIN_WAIT_TIMEOUT
int "Maximum FIN segment lifetime"
default 20000
help
Set maximum segment lifetime in milliseconds.
config LWIP_TCP_SND_BUF_DEFAULT
int "Default send buffer size"
default 5760 # 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 5760 # 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 receive 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_ACCEPTMBOX_SIZE
int "Default TCP accept mail box size"
default 6
range 1 64 if !LWIP_WND_SCALE
range 1 255 if LWIP_WND_SCALE
help
Set TCP accept mail box size. Generally bigger value means supporting larger backlogs
but more memory. The recommended value is 6, but applications can set it to a lower value
if listening servers are meant to have a smaller backlog.
TCP accept mail box is a per socket mail box, when the application listens for connections
with a given listening TCP socket. If the mailbox is full, LWIP will send a RST packet and
the client will fail to connect.
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_OOSEQ_TIMEOUT
int "Timeout for each pbuf queued in TCP OOSEQ, in RTOs."
depends on LWIP_TCP_QUEUE_OOSEQ
range 1 30
default 6
help
The timeout value is TCP_OOSEQ_TIMEOUT * RTO.
config LWIP_TCP_OOSEQ_MAX_PBUFS
int "The maximum number of pbufs queued on OOSEQ per pcb"
depends on LWIP_TCP_QUEUE_OOSEQ
range 0 12
default 4 if !SPIRAM_TRY_ALLOCATE_WIFI_LWIP
default 0 if SPIRAM_TRY_ALLOCATE_WIFI_LWIP
help
If LWIP_TCP_OOSEQ_MAX_PBUFS = 0, TCP will not control the number of OOSEQ pbufs.
In a poor network environment, many out-of-order tcp pbufs will be received.
These out-of-order pbufs will be cached in the TCP out-of-order queue which will
cause Wi-Fi/Ethernet fail to release RX buffer in time.
It is possible that all RX buffers for MAC layer are used by OOSEQ.
Control the number of out-of-order pbufs to ensure
that the MAC layer has enough RX buffer to receive packets.
In the Wi-Fi scenario, recommended OOSEQ PBUFS Range:
0 <= TCP_OOSEQ_MAX_PBUFS <= CONFIG_ESP_WIFI_DYNAMIC_RX_BUFFER_NUM/(MAX_TCP_NUMBER + 1)
In the Ethernet scenario,recommended Ethernet OOSEQ PBUFS Range:
0 <= TCP_OOSEQ_MAX_PBUFS <= CONFIG_ETH_DMA_RX_BUFFER_NUM/(MAX_TCP_NUMBER + 1)
Within the recommended value range, the larger the value, the better the performance.
MAX_TCP_NUMBER represent Maximum number of TCP connections in Wi-Fi(STA+SoftAP) and Ethernet scenario.
config LWIP_TCP_SACK_OUT
bool "Support sending selective acknowledgements"
default n
depends on LWIP_TCP_QUEUE_OOSEQ
help
TCP will support sending selective acknowledgements (SACKs).
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 receive 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, esp_netif 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
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_IPV6_ND6_NUM_PREFIXES
int "Max number of entries in IPv6 on-link prefixes cache"
depends on LWIP_IPV6
default 5
help
Maximum number of entries in IPv6 on-link prefixes cache
config LWIP_IPV6_ND6_NUM_ROUTERS
int "Max number of entries in IPv6 default routers cache"
depends on LWIP_IPV6
default 3
help
Maximum number of entries in IPv6 default routers cache
config LWIP_IPV6_ND6_NUM_DESTINATIONS
int "Max number of entries in IPv6 destinations cache"
depends on LWIP_IPV6
default 10
help
Maximum number of entries in IPv6 destinations cache
menuconfig LWIP_PPP_SUPPORT
bool "Enable PPP support"
default n
help
Enable PPP stack. Now only PPP over serial is possible.
config LWIP_PPP_ENABLE_IPV4
bool "Enable IPV4 support for PPP connections (IPCP)"
depends on LWIP_PPP_SUPPORT && LWIP_IPV4
default y
help
Enable IPCP protocol in PPP negotiations, which assigns IPv4 addresses to the PPP client,
as well as IPv4 DNS servers.
You can disable this if your modem supports IPv6 only.
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_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_PPP_SERVER_SUPPORT
bool "Enable PPP server support"
depends on LWIP_PPP_SUPPORT
default n
help
Enable to use PPP server
config LWIP_PPP_VJ_HEADER_COMPRESSION
bool "Enable VJ IP Header compression"
depends on LWIP_PPP_SUPPORT
default y
help
Enable support for VJ header compression.
Please disable this if you're using NAPT on PPP interface,
since the compressed IP header might not be correctly interpreted
in NAT causing the compressed packet to be dropped.
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
config LWIP_USE_EXTERNAL_MBEDTLS
bool "Use mbedTLS instead of internal polarSSL"
depends on LWIP_PPP_SUPPORT
depends on !LWIP_PPP_MPPE_SUPPORT && !LWIP_PPP_MSCHAP_SUPPORT
default n
help
This option uses mbedTLS crypto functions (instead of internal PolarSSL
implementation) for PPP authentication modes (PAP, CHAP, etc.).
You can use this option to address symbol duplication issues, since
the internal functions are not namespaced (e.g. md5_init()).
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 acquired via DHCP"
default 1
range 1 16
depends on LWIP_DHCP_GET_NTP_SRV
help
Set maximum number of NTP servers acquired 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).
config LWIP_SNTP_STARTUP_DELAY
bool "Enable SNTP startup delay"
default y
help
It is recommended (RFC 4330) to delay the initial request after by a random timeout from 1 to 5 minutes
to reduce potential load of NTP servers after simultaneous power-up of many devices.
This option disables this initial delay. Please use this option with care, it could improve
a single device responsiveness but might cause peaks on the network after reset.
Another option to address responsiveness of devices while using the initial random delay
is to adjust LWIP_SNTP_MAXIMUM_STARTUP_DELAY.
config LWIP_SNTP_MAXIMUM_STARTUP_DELAY
int "Maximum startup delay (ms)"
depends on LWIP_SNTP_STARTUP_DELAY
range 100 300000
default 5000
help
RFC 4330 recommends a startup delay before sending the initial request.
LWIP calculates this delay to a random number of milliseconds between 0 and this value.
endmenu # SNTP
menu "DNS"
config LWIP_DNS_MAX_HOST_IP
int "Maximum number of IP addresses per host"
default 1
help
Maximum number of IP addresses that can be returned by DNS queries for a single host.
config LWIP_DNS_MAX_SERVERS
int "Maximum number of DNS servers"
default 3
range 1 4
help
Set maximum number of DNS servers.
If fallback DNS servers are supported,
the number of DNS servers needs to be greater than or equal to 3.
config LWIP_FALLBACK_DNS_SERVER_SUPPORT
bool "Enable DNS fallback server support"
default n
depends on LWIP_DNS_MAX_SERVERS >= 3
help
Enable this feature to support DNS fallback server.
config LWIP_FALLBACK_DNS_SERVER_ADDRESS
string "DNS fallback server address"
default "114.114.114.114"
depends on LWIP_FALLBACK_DNS_SERVER_SUPPORT
help
This option allows you to config dns fallback server address.
config LWIP_DNS_SETSERVER_WITH_NETIF
bool "Enable DNS server settings with netif"
default n
help
This option allows collecting DNS server settings per netif using
configurable callback function.
It's typically used with CONFIG_ESP_NETIF_SET_DNS_PER_DEFAULT_NETIF
which configures a callback to collect the DNS info on esp_netif layer.
endmenu # DNS
config LWIP_BRIDGEIF_MAX_PORTS
int "Maximum number of bridge ports"
default 7
range 1 63
help
Set maximum number of ports a bridge can consists of.
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_IP6_SELECT_SRC_ADDR
prompt "IPv6 source address selection Hook"
depends on LWIP_IPV6
default LWIP_HOOK_IP6_SELECT_SRC_ADDR_NONE
help
Enables custom IPv6 source address selection.
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_SELECT_SRC_ADDR_NONE
bool "No hook declared"
config LWIP_HOOK_IP6_SELECT_SRC_ADDR_DEFAULT
bool "Default (weak) implementation"
config LWIP_HOOK_IP6_SELECT_SRC_ADDR_CUSTOM
bool "Custom implementation"
endchoice
choice LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE
prompt "Netconn external resolve Hook"
default LWIP_HOOK_NETCONN_EXT_RESOLVE_DEFAULT if OPENTHREAD_DNS64_CLIENT
default LWIP_HOOK_NETCONN_EXT_RESOLVE_NONE if !OPENTHREAD_DNS64_CLIENT
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
choice LWIP_HOOK_IP6_INPUT
prompt "IPv6 packet input"
depends on LWIP_IPV6
default LWIP_HOOK_IP6_INPUT_NONE
help
Enables custom IPv6 packet input.
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_INPUT_NONE
bool "No hook declared"
config LWIP_HOOK_IP6_INPUT_DEFAULT
bool "Default (weak) implementation"
config LWIP_HOOK_IP6_INPUT_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_DEBUG_ESP_LOG
bool "Route LWIP debugs through ESP_LOG interface"
depends on LWIP_DEBUG
default n
help
Enabling this option routes all enabled LWIP debugs through ESP_LOGD.
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_UDP_DEBUG
bool "Enable UDP debug messages"
depends on LWIP_DEBUG
default n
config LWIP_SNTP_DEBUG
bool "Enable SNTP debug messages"
depends on LWIP_DEBUG
default n
config LWIP_DNS_DEBUG
bool "Enable DNS debug messages"
depends on LWIP_DEBUG
default n
config LWIP_NAPT_DEBUG
bool "Enable NAPT debug messages"
depends on LWIP_DEBUG && LWIP_IPV4_NAPT
default n
config LWIP_BRIDGEIF_DEBUG
bool "Enable bridge generic debug messages"
depends on LWIP_DEBUG
default n
config LWIP_BRIDGEIF_FDB_DEBUG
bool "Enable bridge FDB debug messages"
depends on LWIP_DEBUG
default n
config LWIP_BRIDGEIF_FW_DEBUG
bool "Enable bridge forwarding debug messages"
depends on LWIP_DEBUG
default n
endmenu
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