Warning: Unsuccessful read: A timeout occurred before the Terminator was reached.

I'm trying to send data back and forth between a php socket client and a matlab tcpip server. I've done a proof of concept with the php client talking to a php socket server and everything works. I've also been able to make the matlab server send text back to the php client. However, I can't read the message from the php client in Matlab.

Here's the Matlab server code:

%%matlab tcpip server
c1 = tcpip('127.0.0.1', 30000, 'NetworkRole', 'server');
fopen(c1);
disp('waiting for data from client...');
received=false;
while received==false
  try
    A=fscanf(c1);
  catch err
    disp('error receiving from client');
  end

  try
    %fprintf(c1,'server written response');
          fprintf(c1,A);
  catch err
    disp('error writing back');
  end 
        received=true;
end
fclose(c1);

The php code is as follows:

<?php
// php socket client
$host    = "127.0.0.1";
$port    = 30000;
$message = "HelloServer\n ";

echo "Sending message To server :".$message . "<br />";
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// connect to server
$result = socket_connect($socket, $host, $port) or die("Could not connect to server\n");  
// send string to server
socket_write($socket, $message, strlen($message)) or die("Could not send data to server\n");
echo "socket write completed<br />";
// get server response
$result = socket_read($socket, 1024, PHP_NORMAL_READ) or die("Could not read server response\n");

echo "<br />Reply From Server: ".$result;
// close socket
socket_close($socket);
?>

The place that is failing is "A=fscanf(c1);". I've tried it with various other params added but can't get it to receive data. Is there something I'm missing? How should this line and/or the format of the message be set to work? Thanks for any help you can offer.

[Walter Roberson]

What BytesAvailableFcnMode and Terminator end up being configured for the TCP object?

Note: the convention for text transfer is that \r\n is used for the line terminator rather than just \n

[Marc]

I've tried it as A=fscanf(c1,'%c',c1.BytesAvailable) and also with '%s' but no luck. I've also setup the message with \r\n as well. I think I've seen something that says the \n is the only necessary part. Could it be that I need some other terminator? Also, when you say FcnMode are you referring to the format in the second param? Is there something else I should use for a string or is there some documentation you can point me to for this?

[Walter Roberson]

http://www.mathworks.com/help/matlab/matlab_external/bytesavailablefcnmode.html

[Rashi Mehrotra]

I am facing the same problem with udp, Marc did you solve this and how?