Hi,
To address the issue of errors not being reported from the ‘callback’ function in MATLAB R2021b, you can implement a workaround using a MATLAB ‘timer’. This approach mimics the behaviour of the callback by periodically checking for incoming data and processing it.
Here’s how you can achieve this:
% Start the echo server (if needed, otherwise comment out)
% echotcpip('on', 7841); % Just a random port
% Create a tcpclient object
obj = tcpclient("www.rfc-editor.org", 80);
% Configure the terminator
configureTerminator(obj, "LF", "CR/LF");
% Create a timer to check for data periodically
dataTimer = timer( ...
'ExecutionMode', 'fixedSpacing', ...
'Period', 0.1, ... % Check every 0.1 seconds
'TimerFcn', @(~, ~) processData(obj) ...
);
% Start the timer
start(dataTimer);
% Send data to trigger processing
writeline(obj, "GET /rfc/rfc793.txt HTTP/1.1");
writeline(obj, "Host: www.rfc-editor.org");
writeline(obj, "Connection: close");
writeline(obj, ""); % Blank line to indicate end of headers
% Define the data processing function
function processData(client)
try
% Check if data is available
while client.NumBytesAvailable > 0
% Read and process the data
data = readline(client);
fprintf("Received data: %s\n", data);
% Simulate an error for demonstration purposes
fprintf('A simulated error occurred while processing data!\n');
end
catch ME
% Handle or rethrow the error as needed
disp(['Error: ', ME.message]);
end
end
Here’s the link to the documentations you can refer to for more information:
