How do I remove a real-time application from the Speedgoat target file system?

How do I remove a real-time application from the Speedgoat target file system?

Answer 1

[MathWorks Support Team]

There are several ways of removing an application in Simulink Real-Time (SLRT):

(1) Using Simulink Real-Time Explorer

Right-click on the application in the Targets Tree in Simulink Real-Time Explorer and select 'Delete' as shown below:

This context menu is available from R2021a only.

Refer to the following documentation page for more details on SLRT Explorer:https://www.mathworks.com/help/slrealtime/ref/simulinkrealtimeexplorer-app.html 

 

(2) Using Target Object Functions in MATLAB

Starting in R2022a, there is a "removeApplication" function to remove a real-time application from the Speedgoat target:https://www.mathworks.com/help/slrealtime/api/slrealtime.target.removeapplication.html

In R2022b, an additional "removeAllApplications" function was added to remove all applications from the target:https://www.mathworks.com/help/slrealtime/api/slrealtime.target.removeallapplications.html 

 

(3) Using Software Update

When you update the software on the target computer, the process removes all target computer applications and the installed real-time application MLDATX files. To forces an update of the target software to the current version, run the following commands:

tg = slrealtime;
tg.update('force',true)

However, note that this method reboots the target and will therefore take a few seconds to complete.

 

(4) Using basic file operations

There is no documented or supported way of removing applications without using the Simulink Real-Time product, or using the Speedgoat target command-line. But you can try deleting the contents of the 'applications' folder via third-party tools using SSH or using file transfer protocols such as FTP or SCP.

By default, the applications folder is located under '/home/slrt/' and contains one subfolder for each installed application:

/home/slrt/applications/<model1>
/home/slrt/applications/<model2>

When deleting a model subfolder from the applications folder, make sure that:

1. You use 'slrt' as username & password (not 'root').
2. The application is not running or loaded at this time.
3. The application is not used in a startup script.

On the target computer command line, the command to remove all applications would be:

rm -Rf /home/slrt/applications/*

You could achieve the same from within MATLAB by calling the PuTTY "plink" utility like this:

tg = slrealtime;

% Stop and/or unload current application
tg.stop

% In case the application was auto-reloaded, repeat tg.stop to unload
if strcmp(tg.status,'loaded')
    tg.stop
end

% Call PuTTY 'plink' utility to send "rm -Rf applications" command to target
if strcmp(tg.status,'stopped')
    system('"C:\Program Files\PuTTY\plink.exe" -ssh -P 22 -pw slrt slrt@10.10.10.106 rm -Rf applications')
end

Note that using the SFTP/FTP functions shipped with basic MATLAB is not practical since they do not have a recursive remove directory option.

Please be aware that the solutions presented in item (4) are undocumented solutions and not a supported workflow. If you do choose to do this, you are doing this at your own risk.