Issue with UDP socket continous read

I am trying to run distributed network control algorithm. I am sending the states of the system from MATLAB to a machine in the network and receiving the control input from the network and trying to solve the non linear differential equation using ODE45.

I do not have any issues when the controller program is run on the same computer where MATLAB is running. But if I send to any other remote hosts it still runs for a short period and then fscanf times out, though I am able to see the packet being sent from the remote host. I am attaching my code.

Main Program

clc;clear all;instrreset;
global ip;
ip = [];
server = udp('152.14.125.203',9090,'LocalPort',9091);
%server = udp('10.138.37.223',9090,'LocalPort',9091);
%client = udp('192.168.0.12',9091,'LocalPort',9090);
fopen(server)
%fopen(client)
tspan = [1:1:10];
%x0 = [0;1];
x0 = [0;0.526;0;0];
%x0 = zeros(4,1);
[t,x] = ode45(@(t,x) power_sys(t,x,server),tspan,x0);
fwrite(server,'end')
delete(server);

Differential Equation function:

function  dx = power_sys(t, x,server)
   global ip;
% [t,x] = ode45(@(t,x) sys(t,x,server,client),tspan,x0)
   format long
   dx = zeros(4,1);
   % Machine Parameters
    M1 = 4.7;M2 = 4.7;
    E1 = 1;E2 = 0.98;
    x12 = 0.01;
    k12 = E1*E2/x12;
    K =[-0.403068278527916   0.455718526403815   0.072750403407375   0.067255905604533;0.063999385331140   0.067255905604533   0.352416905715348   0.374150309862755];

     s ='';
     temp_str ='';
     for i=1:length(x)
         temp_str = num2str(x(i));
         s = strcat(s,temp_str);
         if i ~= length(x)
             s = strcat(s,'//');
         end
     end

     fwrite(server,s)
     u_str = fscanf(server,'%s')
     u_cell_array = strsplit(u_str,'//');
     for i = 1:length(u_cell_array)
         temp_char = char(u_cell_array(i));
         u(i) = str2num(temp_char);
     end
    ip = [ip;u];
    %Non Linear state space Model
    dx(1) = x(2);
    dx(2) = 1/M1*(u(1)-k12*sin(x(1)-x(3)));
    dx(3) = x(4); 
    dx(4) = 1/M2*(u(2)-k12*sin(x(3)-x(1))); 
  end

[Gitesh Nandre]

Try a basic example and see if it is working: Let's say you have two machines: A(local) and B(remote). Start the echo server on remote machine B by executing following command on remote machine's MATLAB.

echoudp('on',4012)

Create UDP object on local machine A where x.x.x.x is IP address of remote machine B:

u = udp('x.x.x.x',4012);

Connect the UDP object to the host on A machine's MATLAB.

fopen(u)

Write to the host and read from the host.

 fwrite(u,65:74)
 A = fscanf(u,'%s');
 A

Stop the echo server and disconnect the UDP object from the host.

 echoudp('off')
 fclose(u)

See that if the value of 'A' is correctly populated.