How to receive UDP packet

In WireShark, receive this packet, but matlab is not work

%-- Send
u = udp('192.168.1.6', 'RemotePort', 4013, 'LocalPort', 4012);
fopen(u);
fwrite(u,65:74);

%-- Receive
u = udp('192.168.1.55', 'RemotePort', 4012, 'LocalPort', 4013);
fopen(u);
A = fread(u,10)

Answer 1

[ag]

Hi Sungcul,

To establish UDP communication in MATLAB, kindly ensure that the IP addresses and ports are correctly configured, with the sender and receiver having matching configurations. Open the UDP connection using "fopen" and close it with "fclose" to manage resources properly. Check that your network settings, including any firewalls, permit UDP traffic on the specified ports. Use separate udp objects for sending and receiving data to avoid conflicts. Implement "try-catch" blocks to handle any errors that might occur during data transmission. When using "fwrite" and "fread", specify data types explicitly to ensure the data is handled correctly.

The below code snippet illustrates the steps:

% Send
sender = udpport('192.168.1.6', 'RemotePort', 4013, 'LocalPort', 4012);
fopen(sender);
try
    fwrite(sender, 65:74, 'uint8');
catch ME
    disp(ME.message);
end
fclose(sender);
delete(sender);

% Receive
receiver = udpport('192.168.1.55', 'RemotePort', 4012, 'LocalPort', 4013);
fopen(receiver);
try
    A = fread(receiver, 10, 'uint8');
    disp(A');
catch ME
    disp(ME.message);
end
fclose(receiver);
delete(receiver);

For more details, please refer to the following MathWorks documentations:

• udp - https://www.mathworks.com/help/instrument/udp.html
• udpport - https://www.mathworks.com/help/instrument/udpport.html

Hope this helps!