Hi...I have exactly the same problems with you. But I managed to solve it by rather in a cowboy way. I realize that when we try to connect to Pi, matlab transfer some source files to be compiled and failed, in this case the 'devices.c' file. I also realize that when matlab transfers these files it simply overwrite the files that already exist in Pi at /opt/MATLAB/server folder from the previous connecting attempt. My idea is to replace original 'devices.c' with the modified one check : https://www.mathworks.com/matlabcentral/fileexchange/45145-matlab-support-package-for-raspberry-pi-hardware anyway...here is what I did:
1) After I execute the command: mypi=raspi('xxx.xxx.x.x','yy','zzzzzz')
2)Then I wait for the computer to transfer the source files to the Pi (you can see the status from the matlab command console). At this short time window, just before the file transfers finish, you should be able to replace the file 'devices.c' that has been modified by means of commenting out "#ifndef HAVE_STRNDUP ... #endif" section in devices.c in the '/opt/MATLAB/server_vxx.x.x'
yes, it should happen in a short time window to replace the file, including to click the overwrite button in the following pop up message. But, here is the trick...
at first attempt, the failed one, in your raspberry, you copy the file devices.c to other location and modify the file as mentioned before. After that, you right click and copy the modified file. point the file explorer to /opt/MATLAB and prepare/station your pointer position at the 'server' folder in left pane. Back to matlab in your computer, execute the command (step 1) and then wait for the right moment to paste the file in your raspberry. don't forget to hit the overwrite button.
I had to do this way two or three times before success.
