Simulink connection to Shimmer Sensors

Hello,

I recently started using the "Shimmer" wearable sensor plattform. I started using the Shimmer MATLAB Instrument Driver to acquire data from the different sensors. Now I would like to use Simulink Desktop Real-Time to acquire and plot sensor data in realtime in Simulink.

I tried to use a "Matlab Function"-Block in my Simulink Model for the data acquisition.

To Initialize the sensor I used the InitFcn of the "Matlab Function"-Block:

ComPortNo = '11';
shimmer = ShimmerHandleClass(ComPortNo);                                     
SensorMacros = SetEnabledSensorsMacrosClass;                               

 if (shimmer.connect)                                                       
    disp('Shimmer Connected...')
    shimmer.setsamplingrate(512);                                          
    shimmer.setinternalboard('9DOF');                                      
    shimmer.disableallsensors;                                             
    shimmer.setenabledsensors(SensorMacros.MAG,1);                           
    shimmer.setaccelrange(0);                                              
    shimmer.setbattlimitwarning(3.4);                                      
           if (shimmer.start) 
                disp('Shimmer Started...')
           end
 end

As you see the variable "shimmer" is an object-handle.

Now I would like to use this handle within the "Matlab-Function"-Block to use its method

function y = fcn(u)  
  newData = shimmer.getdata('c'); 
  ...

during each Simulation step to get new data from the sensor-buffer. I already tried to make the variable "shimmer" global but I still could not use the handle. I barely used Matlab-Functions within Simulink so i've got no clue what I would have to do.

Maybe anybody can help me with my problem?

thanks in advance Dennis