Can Simulink access data that was written by an imported FMU?

Hi folks,

I have a very specific problem involving an imported FMU in Simulink (Version 9.0, Matlab R2017B). I am not new to Matlab but that topic is pretty new to me. The FMU works as intended and I am not allowed to share the source code or any library files but I can provide a short explanation. The FMU takes information provided by a CAN Bus and calculates data about some detected objects. Let's say speed and dimensions of a car, bike and so on. This data is obviously stored somewhere. The output of the FMU delivers 3 integer values. Two of them can be decoded into the memory address of the written data and the third integer symbolises the number of bytes that were written.

So I included an S-Function which executes C++ Code to calculate the address (I used the legacy code tool for that). The code was already compiled and tested. A simple display block confirms the right value of the address. So I guess I can eliminate this as possible error. Obviously I would like to read the stored data in the memory via the given address. Therefore I set up another S-Function block with C++ Code to read data from the address. But at this point my model crashes. I am thinking it's a problem with permission to read/write memory that is reserved by other processes. Meaning that calling and executing C++ Code (or an FMU block) is treated as a separate process and therefore these processes are not sharing the same allocated memory during a simulation. Is my understanding about that right? So I was looking for a possibility to catch any data that is written during a simulation in Simulink. I even looked into methods to create pointers that access memory allocated by other processes running on a windows system. But I think that is a little over the top and not really a good solution. Especially when trying to create a solution for different environments. In reality this program would run on a embedded controller, where accessing memory like this is pretty common.

Right now I think the only way to get the data is to change the FMU and direct the information to an output. Unfortunately that is not an option -.- I am sorry about my english as i am not a native.

Thank you for your time and help!

Michael