How do I use add_block for adding ROS library content like Blank Messages, Publish and Subscribe block programatically using Simulink? (Using MATLAB R2019a)

This is how my code looks :

clc;clear all;close all;


open_system(new_system('Test'));
system_name = 'Test';
load_system('Robotics System Toolbox')
add_block('Robotics System Toolbox/ROS/Blank Message','Test/msg_1')

I get the following error when I run the above code :

Error using load_system (line 21)

'Robotics System Toolbox' is not a valid model name because it is not a valid MATLAB function name.

Error in test (line 6)

load_system('Robotics System Toolbox') - Show complete stack trace

If I do not include the load_system function :

clc;clear all;close all;


open_system(new_system('Test'));
system_name = 'Test';
%load_system('Robotics System Toolbox')
add_block('Robotics System Toolbox/ROS/Blank Message','Test/msg_1')

, I get a similar error :

Error using test (line 7)

Error due to multiple causes.

Caused by:

Error using test (line 7)

'Robotics System Toolbox' is not a valid model name because it is not a valid MATLAB function name.

Error using test (line 7)

There is no block named 'Robotics System Toolbox/ROS/Blank Message'

Any suggestions on how to fix this?

[AKSHAY SARVESH]

After adding escape characters to the code,

clc;clear all;close all;


open_system(new_system('Test'));
system_name = 'Test';
%load_system('Robotics System Toolbox')
add_block('Robotics\ System\ Toolbox/ROS/Blank\ Message','Test/msg_1')

the error still persists

Error using test (line 7)

Error due to multiple causes.

Caused by:

Error using test (line 7)

'Robotics\ System\ Toolbox' is not a valid model name because it is not a valid MATLAB function name.

Error using test (line 7)

There is no block named 'Robotics\ System\ Toolbox/ROS/Blank\ Message'

Answer 1

[Cam Salzberger]

Hey Akshay,

I haven't tested this, but I believe that you should use (or at least can use) the library name that contains the block rather than the toolbox name. Try:

add_block('robotlib/Subscribe')

-Cam

[AKSHAY SARVESH]

Hi Cam,

This works. Thanks.

Was not aware you are supposed to use library name compared to block name. Any idea on how to obtain library names for different blocks?

Best,

Akshay

[Cam Salzberger]

If you hover over the block in the Library Browser, it should show the "path" to the block (lib/sublib/block).

-Cam

[AKSHAY SARVESH]

Got it. Thanks.

Best,

Akshay