How to write a basic server client program with UDP for Matlab R2023a? (with udpport)

Hello,

How can I write a basic server client program to use in Matlab R2023a that only sends and receives any number via UDP? I looked at the examples and could not understand it completely, it was necessary to create it with the udpport object for Matlab R2023a. Can you help me ?

Regards.

Answer 1

[VINAYAK LUHA]

Hi Elif.

It is my understanding that you wish to write a basic client server program in MATLAB R2023a which sends and receives any number (assumed 1 byte, i.e numbers – [0-255]) over UDP connection.

Here’s a minimalistic code with explanation for your reference –

• Instantiate server.

%Create "echo server" to communicate with at port 4040. 
echoudp("on",4040) 

• Instantiate client.

%Sets up a UDP port at 3030 client end with transmission unit set as "byte". 
u = udpport("byte","LocalPort",3030)  

• Configure callbacks for client

%UserData to count callbacks 
u.UserData = 0; 
%callback function fires when the client buffer has data of at least 1 byte 
configureCallback(u,"byte",1,@readUDPData)  

• Write data to server from client to server at its socket address

write(u,5,"LocalHost",4040) 

• Defining the callback function:

function readUDPData(src,~) 
src.UserData = src.UserData + 1; 
disp("Callback Call Count: " + num2str(src.UserData)) 
data = read(src,src.BytesAvailableFcnCount,"uint8") 
end 

Explore the following documentations to modify it as per your specific requirements-

“udpport” function -

https://www.mathworks.com/help/instrument/udpport.html

Use callbacks for UDP communication-

https://www.mathworks.com/help/instrument/use-callbacks-for-udp-communication.html

Regards,

Vinayak Luha