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simulink link by tcpip with c++ application

Answer 1

A:

I can't see creating socket and binding to it in your C code. Are you sure that you're binding on 127.0.0.1 and port 80? Are you sure that there's no some apache running on the server on port 80?

http://www.linuxhowtos.org/C_C++/socket.htm

Also:

sock_err = send(csock, T, 3*sizeof(double), 0);

I don't also see T in your code, which is probably not the issue, but it doesn't seem to be the datasend pointer to mxArray.

Dmitry Yudakov 2010-02-24 14:49:38

Sorry i had cut the script. here is the full one :http://tinyurl.com/y9l6lqy

Hugo Serrat 2010-02-24 15:14:40

I see #define PORT 81, you bind on this port, but in simulink model (I'm not an expert in it) I see port 80. Perhaps you need to change one of them.

Dmitry Yudakov 2010-02-25 10:31:10

Yes i Changed it.when i changed ports on simulink i did it in the c++ apps

Hugo Serrat 2010-02-25 13:13:50

Does the server produce any log? Is the client able to connect? Does the server sends the data?

Dmitry Yudakov 2010-02-25 15:16:06

there isn't any logs. but there is a debug console for simulink.the client connects to the server. and with the tcpip example .m from matlab i can get some data like hello. but i always get a timeout from the matlab client

Hugo Serrat 2010-02-25 20:52:27

Do you get the timeout 10 seconds after the connect? I see Timeout "10" configured, but can't understand if these are seconds (SampleTime setting is not very clear to me). Have you tried increasing it? To 10000 for a test.I see that you send 3*sizeof(double) and expect [1 3] (which ought to mean 3 items I suppose) of type double, is it possible matlab double to be more than 8 bytes as it's in c++?

Dmitry Yudakov 2010-02-26 08:43:20

something that i don't understand if i have to send the 3 double data seperatly or all in one time

Hugo Serrat 2010-02-26 12:06:05

even the example of matlab instrument control fails to connect ! http://www.mathworks.com/access/helpdesk/help/toolbox/instrument/brbv41k-1.html

Hugo Serrat 2010-02-26 17:10:06

It shouldn't matter if you send 3 x 8 bytes or 1 x 24 bytes, the client is blocked until 24 bytes received.If the client fails to connect, it's usually wrong port or wrong IP. Try setting port 81 in both server and client.

Dmitry Yudakov 2010-02-27 18:11:05

I tried on the same computer with ip "localhost" and port 81:81 and 50000:50000 like in the example sending a sin wave but it doesn't work

Hugo Serrat 2010-02-28 15:52:44

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simulink link by tcpip with c++ application

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