zhhyu7 opened a new pull request, #17676:
URL: https://github.com/apache/nuttx/pull/17676
## Summary
the maximum retransmission interval allowed for car projects cannot exceed 6
seconds, and allows for fixed retransmission intervals. according to the
previous algorithm, the retransmission interval may be 0.5 * 2 ^ 4 = 8 seconds,
which does not meet the requirements.
## Impact
retransmission Time Strategy for TCP Network Communication.
## Testing
sim:matter with iperf
test log
```
NuttShell (NSH) NuttX-12.11.0
MOTD: username=admin password=Administrator
nsh> iperf -c 10.0.1.1 -B 10.0.1.2
IP: 10.0.1.2
mode=tcp-client sip=10.0.1.2:5001,dip=10.0.1.1:5001, interval=3, time=30
Interval Transfer Bandwidth
0.00- 3.08 sec 189693952 Bytes 492.71 Mbits/sec
3.08- 8.89 sec 359940096 Bytes 495.61 Mbits/sec
8.89- 11.96 sec 190152704 Bytes 495.51 Mbits/sec
11.96- 16.11 sec 254279680 Bytes 490.18 Mbits/sec
16.11- 22.52 sec 388710400 Bytes 485.13 Mbits/sec
22.52- 25.78 sec 200228864 Bytes 491.36 Mbits/sec
25.78- 31.58 sec 347570176 Bytes 479.41 Mbits/sec
0.00- 31.58 sec 1946484736 Bytes 493.09 Mbits/sec
iperf exit
nsh> poweroff
[Inferior 1 (process 3015966) exited normally]
(gdb) q
nuttx$ cat .config | grep DROP
# CONFIG_NET_TCP_DEBUG_DROP_RECV is not set
CONFIG_NET_TCP_DEBUG_DROP_SEND=y
CONFIG_NET_TCP_DEBUG_DROP_SEND_PROBABILITY=50
nuttx$ cat .config | grep FIXED
CONFIG_NET_TCP_FIXED_RTO=y
# CONFIG_MBEDTLS_ECP_FIXED_POINT_OPTIM is not set
```
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