Unable to use UDP when using a standalone executable

2022 10 12
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更新时间：2022 11 4
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I have a Matlab App which communicates with external software via UDP packets. The program works fine when I run the app through Matlab. However, if I convert the app to a standalone executable and run it via MCR, I get an error regarding UDP comms. I suspected it was due to a firewall, but I completely disabled the firewall on both machines and still get the error.
Any suggestions?

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Eric Delgado
Eric Delgado 2022-10-12

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Firewall. No doubt about it! :)
Just add your app (not Matlab, but your deployed app) in "white list" of the firewall. See image below.

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Josiah Renfree
Josiah Renfree 2022-11-4
So this indeed was a necessary step, but it wasn't entirely causing the issue I was having (I had previously tried this step to no avail).
The other issue I had is that when a standalone executable runs, the 'working directory' is not necessarily the directory where the application is installed. I believe the working directory is "C:\Windows\System32" instead of, for examples, "C:\Program Files\Matlab_app". Moreover, my application requires reading and writing to a text file, and not only was I trying to read/write from the wrong directory, but I also didn't have write privileges to "C:\Windows\System32".
In addition to adding a firewall exemption to the application as described above, my solution involved changing my Matlab application to reading/writing to a hard-coded directory in "C:\ProgramData", so that I had write privileges and wasn't relying on the 'pwd' command.
Thanks!
Eric Delgado
Eric Delgado 2022-11-4
Hummmm... don't forget to create an property that hold the path of your app... app.RootFolder, for example.
if isdeployed
[~, result] = system('path');
app.RootFolder = char(regexpi(result, 'Path=(.*?);', 'tokens', 'once'));
end
And install your app in a location that you have write pivilegies.

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