Chapter 2. API Reference
CONFIG_LWIP_USE_ONLY_LWIP_SELECT
Support LWIP socket select() only (DEPRECATED)
Found in: Component config > LWIP
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.
Default value:
• No (disabled)
CONFIG_LWIP_SO_LINGER
Enable SO_LINGER processing
Found in: Component config > LWIP
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.
Default value:
• No (disabled)
CONFIG_LWIP_SO_REUSE
Enable SO_REUSEADDR option
Found in: Component config > LWIP
Enabling this option allows binding to a port which remains in TIME_WAIT.
Default value:
• Yes (enabled)
CONFIG_LWIP_SO_REUSE_RXTOALL
SO_REUSEADDR copies broadcast/multicast to all matches
Found in: Component config > LWIP > CONFIG_LWIP_SO_REUSE
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.
Default value:
• Yes (enabled)
CONFIG_LWIP_SO_RCVBUF
Enable SO_RCVBUF option
Found in: Component config > LWIP
Enabling this option allows checking for available data on a netconn.
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