Hi,
finally I received a reply from the support that explains why the development site is no longer accessible.
Please allow me to inform you at this time, we are re-evaluating our program and the current My Cloud Home SDK/API program is in the process of being shut down.
We want to let you know now so you don’t start developing something that won’t work by the time you finish.
So unfortunately the API support will not be continued in the future 
.
I found this information essential, so I want to share it with you all. Hopefully there will be a programming interface in the future, but currently it doesn’t seem so.
Regards
Michael
