Hi All,
I am using lwIP 1.3+ PPP working in GPRS environment.
I meet following case
There is TCP connection between A,B.
A: B:
------------- -->
<---------------
------------- -->
<--------------- ------------- -->
<---------------
Some time the flow could work correct, some time A is waiting, and B is
waiting. I put in the LAN environment, every thing is ok. The problem is
only in GPRS environment. Anther side in out of my control I unable to run
wireshark to monitor what happened.
After I read the code, I have this guess. May this thing possible that
netconn_write return, but the data is not send out.
netconn_write return means
1> Data in the TCP/IP stack
Wether it comes out depend the task schedule, if the data is lost in the
line, the netconn_write already returned.
If it is true, is the any API could i flush the data in the send buffer,
force the data send out, and make sure the data has been ACK by remote.
Lee
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