Problem in communicating MATLAB with Simulink via UDP communication..

Hello Sir/Mam,

I am trying to send real time coordinates of tracked ball from MATLAB to Simulink with UDP communication.

This is my code:

vid = videoinput('winvideo',1);

set(vid, 'FramesPerTrigger', 1);

set(vid, 'TriggerRepeat', Inf);

triggerconfig(vid, 'manual');

start(vid);

mdl = 'udpsim';

open_system(mdl);

ball_diameter = 20;

ball_radius = ball_diameter/2;

ball_min_size = round(ball_diameter / 0.07);

gray_threshold = 200;

sat_threshold = 0.2;

ball_color = [190, 190, 190];

localIP = '10.53.126.43';

remoteIP = '10.53.126.43';

u = udpport(remoteIP, 'RemotePort', 51002, 'LocalPort', 51001, 'OutputBufferSize', 1024);

fopen(u);

i=1;

while i<10000

img = imread(vid);

gray_img = rgb2gray(img);

sat_img = rgb2hsv(img);

sat_img = sat_img(:,:,2);

gray_mask = gray_img > gray_threshold;

sat_mask = sat_img > sat_threshold;

mask = gray_mask & sat_mask;

mask = bwareaopen(mask, ball_min_size);

stats = regionprops(mask, 'Centroid');

if isempty(stats)

ball_coord = [-1, -1];

else

ball_centroid = stats(1).Centroid;

ball_coord = [ball_centroid(1), ball_centroid(2)];

end

write(u, sprintf('[%f,%f]', ball_coord(1), ball_coord(2)));

end

stop(vid); %#ok<UNRCH>

delete(vid);

fclose(u);

Simulink Model:

Problem:

When I run Simulink model 1st then Matlab code not run and If I run Matlab code 1st, I am getting this error

Expected input number 1 to match one of these values:

'byte', 'datagram', 'IPV4', 'IPV6', 'LocalHost', 'LocalPort', 'Timeout', 'ByteOrder', 'OutputDatagramSize', 'EnablePortSharing'

The input, '10.53.126.43', did not match any of the valid values.

How to run simultaneously both ?

Please Help! I will be very grateful to you...

Answer 1

[Vinayak Choyyan]

Hi JAIN VIRAG,

As per my understanding, you are getting an error message related to input mismatch when trying to use ‘udpport’ function.

In your code, it looks like you have used ‘udpport’ function but passed it with parameters of ‘udp’ function. Please refer to the following documentation to know more about the functions:

• ‘udpport’ function https://www.mathworks.com/help/instrument/udpport.html
• ‘udp’ function https://www.mathworks.com/help/instrument/udp.html?s_tid=doc_ta

Please note, ‘udp’ function will be removed in a future release. Use ‘udpport’ instead.

I hope this resolves the issue you are facing.