How can i send data in using "UDP" Command?

I wanted to send data in network .Firstly ,I have loaded file name as "target.dat" .

this is the code i used to send data.

HOST1 = '192.168.3.13';

SOURCE_PORT1 = 4038;

LOCAL_PORT1 = 1020;

Buffer_size1 = 50000;

u1 = udp(HOST1, SOURCE_PORT1,'Localport' ,LOCAL_PORT1);

set(u1,'inputBufferSize',Buffer_size1);

set(u1,'outputBufferSize',Buffer_size1);

fopen(u1);

flushinput(u1); %flusing i/p o/p buffers

flushoutput(u1);

disp("sent")

its showing error as:

"Unsuccessful open: Address already in use: Cannot bind"

Please, help me out sloving this error.

I restarted matlab application also, still same same error is appearing.

Answer 1

[Koundinya]

Like the error message mentions, the port is already being used by another application ( or by an earlier run of your MATLAB script) . You might need to first restart your machine to free up the port ( or kill the process that is listening on that port).

You can enable port sharing to allow multiple UDP sockets to bind to the port :

u1 = udp(HOST1, SOURCE_PORT1,'Localport' ,LOCAL_PORT1);
u1.EnablePortSharing = 'on';

Also make sure to close the UDP socket at the end to avoid running into such problems :

fclose(u1);