How can I receive a cell array using a UDP port?

I have the following code where I am sending a cell array containing numeric and string values. I want to receive and read this cell array on another client. How can I modify the code to achieve this?

client_port = 10011;
clientAddress = '192.168.100.202';

% Define the cell array
C = {5 "cereal" 110 "C+"; 12 "pizza" 140 "B";...
    23 "salmon" 367 "A"; 2 "cookies" 160 "D"};

% Open a UDP port
u2 = udpport("IPV4",'LocalPort',client_port);

for ii = 1:numel(C)
    write(u2, C{ii}, class(C{ii}), clientAddress, client_port);
end

Answer 1

[Hassaan]

Sender

client_port = 12389;
clientAddress = '192.168.100.202';

% Define the cell array
C = {5, "cereal", 110, "C+"; 12, "pizza", 140, "B";...
    23, "salmon", 367, "A"; 2, "cookies", 160, "D"};

% Convert the cell array to JSON string
C_json = jsonencode(C);

% Open a UDP port
u2 = udpport("IPV4", 'LocalPort', client_port);

% Send the JSON string every 1 second
while true
    % Send the JSON string
    write(u2, uint8(C_json), "uint8", clientAddress, client_port);
    
    disp('Data sent..');
    
    % Pause for 1 second before next send
    pause(1);
end

Receiver

% Example port and IP setup for the receiver
server_port = 12389; % The port where the server listens

% Open a UDP port for receiving
u = udpport("IPV4", 'LocalPort', server_port);

% Loop until data is received
while true
    % Check if data is available
    if u.NumBytesAvailable > 0
        % Read the available data
        data = read(u, u.NumBytesAvailable, "uint8");
        
        % Convert uint8 data to string
        data_str = char(data');
        
        % Decode the JSON string back to cell array
        C_received = jsondecode(data_str);
        
        % Display the received cell array
        disp(C_received);
        
        % Break the loop after processing the received data
        break;
    else
        % Optional: pause for a short time to avoid busy waiting
        pause(0.1);
    end
end

This code assumes that the receiving client is set up and ready to receive data sent to its LocalPort. Adjust the server_port and any other necessary configuration to match your setup.

Note: The effectiveness of this method depends on the size of your cell array and the limitations of your UDP buffer sizes. Large data might need segmentation and reassembly logic.

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[Med Future]

@Hassaan

I'm getting the following error on reciver side How can i solve this issue:

Error using jsondecode
JSON text must be a character vector or a scalar non-missing string

[Med Future]

@Hassaan Can you look on this Error?

[Walter Roberson]

I would check whether data_str is 1 x N or N x 1