TCP/IPv4/uIP stack appears to be broken with recent commit
To make sure that my comment to
https://gerrit.zephyrproject.org/r/#/c/4282/6 isn't lost, I'd like to
dup it with this email. The patch above has broke echo_server
TCP/IPv4 for me. When run on frdm_k64f over Ethernet, the application
answers pings, but being telneted to port 4242, it doesn't echo TCP
data. Note that the issue of "The trouble is that that linkage between
the outgoing buffer and the connection hasn't been established at the
point data_is_sent_and_acked() is called" has been fixed some time ago
by https://gerrit.zephyrproject.org/r/#/c/4888/ .
Reverting just that commit fixes issue for me.
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