I am planning to add Google cast feature on my existing iOS and Android application streaming audio application. 

I don't have Chrome cast device. But i have Android TV(KDL-43W950C). 

Can i use my Android TV for developing Google-cast application?
If it so, how to register Android TV in Google Cast Developer Console?. Android TV has the serial number of 7 digits, where as registration form expects 8-20 characters.

Google Chrome cast application also does not detect the Android TV

Google Document covers for the Chrome cast devices, not for Android TV.