Simulink link by tcpip with C++ application - c++

Question

I am tryng to build a link between my simulink model or just an m file and my C++ application but I'm having an issue. I don't really understand how matlab receives the data, and for simulink in which form should I send the data to the block? I would like to send coordinates like xyz to matlab and with matlab scatter3 the stream of coordinates in real time. Is it possible ?
Here is the C++ extract code : (sorry comments are in french)
/* Démarrage du listage (mode server) */
sock_err = listen(sock, 5);
printf("Listage du port %d...\n", PORT);
/* Si la socket fonctionne */
if(sock_err != SOCKET_ERROR)
{
/* Attente pendant laquelle le client se connecte */
printf("Patientez pendant que le client se connecte sur le port %d...\n", PORT);
csock = accept(sock, (SOCKADDR*)&csin, &recsize);
printf("Un client se connecte avec la socket %d de %s:%d\n", csock, inet_ntoa(csin.sin_addr), htons(csin.sin_port));
// double buff = 25;
mxArray *datasend;
datasend = mxCreateDoubleMatrix(1, 1, mxREAL);
mlfPrintmatrix(datasend);
sock_err = send(csock, T, 3*sizeof(double), 0);
if(sock_err != SOCKET_ERROR)
printf("Send : %s\n", buffer[0]);
//printf("send : [10 20 30]");
else
printf("Erreur de transmission\n");
/* Il ne faut pas oublier de fermer la connexion (fermée dans les deux sens) */
shutdown(csock, 2);
}
Simulink errors:
Error evaluating registered method 'Outputs' of M-S-Function 'stcpiprb' in 'trajectory2/TCP//IP Receive'. The specified amount of data was not returned within the Timeout period.
Please ensure that data is being sent to the specified port or specify a greater timeout value.
The specified amount of data was not returned within the Timeout period.
Please ensure that data is being sent to the specified port or specify a greater timeout value.
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Answer 1

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.