If you are using MATLAB R2018b you can use the attached blocks to set the smart motor voltages and read advanced motor parameters like voltage, current, power, torque, efficiency and temperature.
All you have to do to use these blocks in your models is copy/paste them from the model attached, and make sure that the respective m-files are added to the MATLAB path or in the same folder as your working model.
If you have any questions regarding these blocks, feel free to contact the MathWorks Student Competitions Team at roboticsarena@mathworks.com