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

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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?

  1 Comment

AKSHAY SARVESH
AKSHAY SARVESH on 26 Jul 2020
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'

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Accepted Answer

Cam Salzberger
Cam Salzberger on 27 Jul 2020
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

  3 Comments

AKSHAY SARVESH
AKSHAY SARVESH on 28 Jul 2020
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
Cam Salzberger on 28 Jul 2020
If you hover over the block in the Library Browser, it should show the "path" to the block (lib/sublib/block).
-Cam

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