Chapter 2. API Reference
Available options:
• MSS (LWIP_TCP_OVERSIZE_MSS)
• 25% MSS (LWIP_TCP_OVERSIZE_QUARTER_MSS)
• Disabled (LWIP_TCP_OVERSIZE_DISABLE)
CONFIG_LWIP_WND_SCALE
Support TCP window scale
Found in: Component config > LWIP > TCP
Enable this feature to support TCP window scaling.
Default value:
• No (disabled) if CONFIG_SPIRAM_TRY_ALLOCATE_WIFI_LWIP
CONFIG_LWIP_TCP_RCV_SCALE
Set TCP receiving window scaling factor
Found in: Component config > LWIP > TCP > CONFIG_LWIP_WND_SCALE
Enable this feature to support TCP window scaling.
Range:
• from 0 to 14 if CONFIG_LWIP_WND_SCALE
Default value:
• 0 if CONFIG_LWIP_WND_SCALE
CONFIG_LWIP_TCP_RTO_TIME
Default TCP rto time
Found in: Component config > LWIP > TCP
Set default TCP rto time for a reasonable initial rto. In bad network environment, recommend set value
of rto time to 1500.
Default value:
• 3000
• 1500
UDP Contains:
• CONFIG_LWIP_UDP_RECVMBOX_SIZE
• CONFIG_LWIP_MAX_UDP_PCBS
CONFIG_LWIP_MAX_UDP_PCBS
Maximum active UDP control blocks
Found in: Component config > LWIP > UDP
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.
Range:
• from 1 to 1024
Default value:
• 16
Espressif Systems 1173
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