Re: [lwip-devel] Help with UDP Iperf server

[Dirk Ziegelmeier]

are you aware that UDP is a connectionless protocol? So there is no possibility to detect an "end of the connection" as for TCP.

Dirk

On Mon, Sep 24, 2018 at 5:32 PM antonio <address@hidden> wrote:

Hi all,

I am developing a small UDP Iperf server. I am able to connect to it and get
measurements.
However,  I am unable to detect, when the  client intends to end the
connection. I need it because, I intend to supply
-d option at the client side, which enables bidirectional measurement.

>From the example in apps/ there is a structure
lwiperf_settings_t; which states /** This is the Iperf settings struct sent
from the client */
I print the field flags and are always zero.

All hints are welcome.


LOG
fw$ iperf -c 172.28.49.204 -u -t 100 -i 5 -b 10m

------------------------------------------------------------
Client connecting to 172.28.49.204, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 172.28.49.37 port 44159 connected with 172.28.49.204 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 5.0 sec  5.96 MBytes  10.0 Mbits/sec
[  3]  5.0-10.0 sec  5.96 MBytes  10.0 Mbits/sec
[  3] 10.0-15.0 sec  5.96 MBytes  10.0 Mbits/sec
[  3] 15.0-20.0 sec  5.96 MBytes  10.0 Mbits/sec
[  3] 20.0-25.0 sec  5.96 MBytes  10.0 Mbits/se
..........
[  3]  0.0-100.0 sec   119 MBytes  10.0 Mbits/sec
[  3] Sent 85035 datagrams
[  3] WARNING: did not receive ack of last datagram after 10 tries.



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