How to use a dll file in Simulink/Simscape using S-functions?

In order to share a Simulink/Simscape model with a third party I generated a shared library/ dll-file from this model. I assume this provides a safe way to share a protected model. However to test if the dll-file works, I want to make sure that I myself can run the dll file again in Simulink. I understand that S-function blocks are used to do this, however I don't know how to do this for dll-files (in contrast to mex files, which can be simply added to the S-function block).

Online I found quite some help on this, however I'm not familiar with C-code and didn't understand the answers there.

Such as online help 1, online help 2, online help 3

So my question comes down to:

1. What are the steps I need to take to use a dll file in a s-function block?
2. Do I need to write c-code supporting files for this to work?
3. Can S-functions work with Simscape blocks?
4. I want to share this dll as a protected file ( to keep the third party from knowing what's inside the model). Is this possible with dll-files? I know 'protected models' cannot be used because of the fact that I use Simscape ports at the root level of my model.

Regarding info on the model: the model contains several simulink in/output ports as wel as Simscape in/output ports. The logic inside will only contain basic simulink/simscape blocks.

Answer 1

[Oliver Jaehrig]

As discussed, please follow this external article:

https://www.mathworks.com/matlabcentral/answers/419035-how-do-i-create-a-protected-simscape-subsystem-can-i-use-protected-models-and-or-s-functions