Matlab can not read the socket for the second time - matlab

Question

I want to communicate between two programs. MATLAB is able to read the socket once but when it tries to read it again, I get the following warning
Warning: Unsuccessful read: A timeout occurred before the Terminator was reached.
Matlab code:
clc
clear all
while(1)
clear tcpipServer
tcpipServer = tcpip('127.0.0.1', 55000, 'NetworkRole', 'Server');
set(tcpipServer, 'Timeout', 30);
fopen(tcpipServer);
rawData = fgetl(tcpipServer);
fclose(tcpipServer);
end
The data which is sent to Matlab is defined as string and the value is "y\n".
The problem is that I only receive "y\n" once.
The other side connected to the socket is the Unity game engine. I think the code in the unity is correct because I tested that by c# windows app and I can get the value as long as program is running.
Does anyone know why this is happening?

Answer 1

This is the solution i found.
Matlab code:
clc
clear all
%% server initialization
tcpipServer = tcpip('127.0.0.1',55000,'NetworkRole','Server');
set(tcpipServer,'Timeout',30);
while(1)
%% server code: listening for incoming requests
fopen(tcpipServer);
%rawData = fread(tcpipServer,1,'char');
rawData = fgetl(tcpipServer)
extractedData=str2double(strsplit(rawData,'-'))
fclose(tcpipServer);
Unity C# code:
using UnityEngine;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Linq;
using System;
using System.IO;
using System.Text;
public class server : MonoBehaviour {
// Use this for initialization
TcpListener listener;
String msg;
StreamWriter theWriter1;
internal Boolean socketReady = false;
TcpClient mySocket;
NetworkStream theStream;
StreamWriter theWriter;
StreamReader theReader;
String Host = "localhost";
Int32 Port = 55000;
bool firstTimeRun=true;
void Start () {
}
// Update is called once per frame
void Update () {
setupSocket ();
if (Input.GetMouseButtonDown (0))
{
setupSocket ();
}
}
public void setupSocket() {
try {
TcpClient mySocket1;
NetworkStream theStream1;
//StreamWriter theWriter1;
mySocket1 = new TcpClient(Host, Port);
theStream1 = mySocket1.GetStream();
theWriter1 = new StreamWriter(theStream1);
Invoke("write", 0.2f);
}
catch (Exception e) {
Debug.Log("Socket error: " + e);
}
}
void write()
{
float x;float y;
x = GameObject.FindGameObjectWithTag ("Player").transform.position.x;
y=GameObject.FindGameObjectWithTag ("Player").transform.position.y;
theWriter1.Write(x+"-"+y+"\n");
theWriter1.Flush();
}
The reason I used "\n" is using fgetl function in Matlab code. if you want to make the code more functional use delay along with Asynchronous tasks in Unity. for those wandering why using delay is required, see the comments under question.