Incorrect Data Interpretation in UDP Reception with Simulink

On an ESP32, I am sending distance data via UDP to MATLAB. There are multiple distances involved, so both the receiver number (from 81 to 84) and the respective distance are transmitted. I can also receive and analyze the data using the following program:
% Set up the UDP receiver
udpReceiver = udpport("LocalPort", 4141);
% Define a function to parse the received UDP packet
% Main loop to continuously receive and display distances
while true
% Check if a packet is available
if udpReceiver.NumBytesAvailable > 0
% Read the packet
packet = read(udpReceiver, udpReceiver.NumBytesAvailable, "char");

% Parse the received packet
[distance1, distance2, distance3, distance4] = parsePacket(packet);

% Display current distances
fprintf(‘Distance from Device 1: %.2f metersn’, distance1);
fprintf(‘Distance from Device 2: %.2f metersn’, distance2);
fprintf(‘Distance from Device 3: %.2f metersn’, distance3);
fprintf(‘Distance from Device 4: %.2f metersn’, distance4);

fprintf(‘n’); % Add newline for clarity
end
pause(0.1);
end

% Clean up
delete(udpReceiver)
function [distance1, distance2, distance3, distance4] = parsePacket(packet)
% Convert packet to string
packetStr = char(packet);

% Split the string by semicolon
data = strsplit(packetStr, ‘;’);

% Initialize distances
distance1 = NaN;
distance2 = NaN;
distance3 = NaN;
distance4 = NaN;

% Parse each part of the data
for i = 1:length(data)
% Split by comma to separate address and distance
parts = strsplit(data{i}, ‘,’);
device = str2double(parts{1});
distance = str2double(parts{2});

% Assign distances based on address
switch device
case 1
distance1 = distance;
case 2
distance2 = distance;
case 3
distance3 = distance;
case 4
distance4 = distance;
end
end
end

Now I want to further process only the respective distances in Simulink. For this, I have converted the code into a Level 2 MATLAB function. Here is the code for it:

function UDP_Receiver(block)
setup(block);
function setup(block)
block.NumInputPorts = 0;
block.NumOutputPorts = 4;
block.SetPreCompInpPortInfoToDynamic;
block.SetPreCompOutPortInfoToDynamic;
block.NumDialogPrms = 0;
block.SampleTimes = [-1 0];
block.SimStateCompliance = ‘DefaultSimState’;
block.RegBlockMethod(‘SetInputPortSamplingMode’, @SetInpPortFrameData);
block.RegBlockMethod(‘Outputs’, @Outputs);
block.RegBlockMethod(‘Terminate’, @Terminate);
% Initialize UDP receiver

% Set output port sampling modes
for i = 1:block.NumOutputPorts
block.OutputPort(i).SamplingMode = ‘Sample’; % Set all output ports to Sample mode
end
block.SetAccelRunOnTLC(true);
function SetInpPortFrameData(block, idx, fd)
block.InputPort(idx).SamplingMode = fd;
for i = 1:block.NumOutputPorts
block.OutputPort(i).SamplingMode = fd;
end
function Outputs(block)
udpreceiver = udpport("LocalPort", 4141);
% Check if UDP receiver is valid
while true
if isvalid(udpreceiver)
% Check if a packet is available
if udpreceiver.NumBytesAvailable > 0
% Read the packet
packet = read(udpreceiver, udpreceiver.NumBytesAvailable, "char");
% Parse the received packet
[distance1, distance2, distance3, distance4] = parsePacket(packet);
% Output distances
block.OutputPort(1).Data = distance1;
block.OutputPort(2).Data = distance2;
block.OutputPort(3).Data = distance3;
block.OutputPort(4).Data = distance4;
end
end
end
function Terminate(block)

% Define a function to parse the received UDP packet
function [distance1, distance2, distance3, distance4] = parsePacket(packet)
% Initialize distances
distance1 = NaN;
distance2 = NaN;
distance3 = NaN;
distance4 = NaN;
% Convert packet to string
packetStr = char(packet);
% Split the string by semicolon
data = strsplit(packetStr, ‘;’);
% Parse each part of the data
for i = 1:length(data)
% Split by comma to separate address and distance
parts = strsplit(data{i}, ‘,’);
if numel(parts) == 2
device = str2double(parts{1});
distance = str2double(parts{2});
% Assign distances based on address
switch device
case 1
distance1 = distance;
case 2
distance2 = distance;
case 3
distance3 = distance;
case 4
distance4 = distance;
end
end
end

Even though it is the same code, the simulation gets terminated or the Data is wrong. What can i do?On an ESP32, I am sending distance data via UDP to MATLAB. There are multiple distances involved, so both the receiver number (from 81 to 84) and the respective distance are transmitted. I can also receive and analyze the data using the following program:
% Set up the UDP receiver
udpReceiver = udpport("LocalPort", 4141);
% Define a function to parse the received UDP packet
% Main loop to continuously receive and display distances
while true
% Check if a packet is available
if udpReceiver.NumBytesAvailable > 0
% Read the packet
packet = read(udpReceiver, udpReceiver.NumBytesAvailable, "char");

% Parse the received packet
[distance1, distance2, distance3, distance4] = parsePacket(packet);

fprintf(‘n’); % Add newline for clarity
end
pause(0.1);
end

% Clean up
delete(udpReceiver)
function [distance1, distance2, distance3, distance4] = parsePacket(packet)
% Convert packet to string
packetStr = char(packet);

% Split the string by semicolon
data = strsplit(packetStr, ‘;’);

% Initialize distances
distance1 = NaN;
distance2 = NaN;
distance3 = NaN;
distance4 = NaN;

% Assign distances based on address
switch device
case 1
distance1 = distance;
case 2
distance2 = distance;
case 3
distance3 = distance;
case 4
distance4 = distance;
end
end
end

Now I want to further process only the respective distances in Simulink. For this, I have converted the code into a Level 2 MATLAB function. Here is the code for it:

Even though it is the same code, the simulation gets terminated or the Data is wrong. What can i do? On an ESP32, I am sending distance data via UDP to MATLAB. There are multiple distances involved, so both the receiver number (from 81 to 84) and the respective distance are transmitted. I can also receive and analyze the data using the following program:
% Set up the UDP receiver
udpReceiver = udpport("LocalPort", 4141);
% Define a function to parse the received UDP packet
% Main loop to continuously receive and display distances
while true
% Check if a packet is available
if udpReceiver.NumBytesAvailable > 0
% Read the packet
packet = read(udpReceiver, udpReceiver.NumBytesAvailable, "char");

% Parse the received packet
[distance1, distance2, distance3, distance4] = parsePacket(packet);

fprintf(‘n’); % Add newline for clarity
end
pause(0.1);
end

% Clean up
delete(udpReceiver)
function [distance1, distance2, distance3, distance4] = parsePacket(packet)
% Convert packet to string
packetStr = char(packet);

% Split the string by semicolon
data = strsplit(packetStr, ‘;’);

% Initialize distances
distance1 = NaN;
distance2 = NaN;
distance3 = NaN;
distance4 = NaN;

% Assign distances based on address
switch device
case 1
distance1 = distance;
case 2
distance2 = distance;
case 3
distance3 = distance;
case 4
distance4 = distance;
end
end
end

Now I want to further process only the respective distances in Simulink. For this, I have converted the code into a Level 2 MATLAB function. Here is the code for it:

Even though it is the same code, the simulation gets terminated or the Data is wrong. What can i do? udp, udp receive, simulink, level2 function MATLAB Answers — New Questions

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