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CONFIG_NET_TCP_RETRY_COUNT
¶
Maximum number of TCP segment retransmissions
Type: int
Help¶
The following formula can be used to determine the time (in ms) that a segment will be be buffered awaiting retransmission: n=NET_TCP_RETRY_COUNT Sum((1<<n) * NET_TCP_INIT_RETRANSMISSION_TIMEOUT) n=0 With the default value of 9, the IP stack will try to retransmit for up to 1:42 minutes. This is as close as possible to the minimum value recommended by RFC1122 (1:40 minutes). Only 5 bits are dedicated for the retransmission count, so accepted values are in the 0-31 range. It’s highly recommended to not go below 9, though. Should a retransmission timeout occur, the receive callback is called with -ECONNRESET error code and the context is dereferenced.
Direct dependencies¶
NET_TCP
&& !NET_RAW_MODE
&& NETWORKING
(Includes any dependencies from ifs and menus.)
Default¶
9
Kconfig definition¶
At <Zephyr>/subsys/net/ip/Kconfig:361
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:34
→ <Zephyr>/subsys/Kconfig:34
→ <Zephyr>/subsys/net/Kconfig:87
Menu path: (Top) → Sub Systems and OS Services → Networking → Link layer and IP networking support → IP stack → Enable TCP
config NET_TCP_RETRY_COUNT int "Maximum number of TCP segment retransmissions" default 9 depends onNET_TCP
&& !NET_RAW_MODE
&&NETWORKING
help The following formula can be used to determine the time (in ms) that a segment will be be buffered awaiting retransmission: n=NET_TCP_RETRY_COUNT Sum((1<<n) * NET_TCP_INIT_RETRANSMISSION_TIMEOUT) n=0 With the default value of 9, the IP stack will try to retransmit for up to 1:42 minutes. This is as close as possible to the minimum value recommended by RFC1122 (1:40 minutes). Only 5 bits are dedicated for the retransmission count, so accepted values are in the 0-31 range. It's highly recommended to not go below 9, though. Should a retransmission timeout occur, the receive callback is called with -ECONNRESET error code and the context is dereferenced.
(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)