There are two types of API references, libs & env and public.
Extract zipped files, libs_env.tar.gz and public.tar.gz.
tar -xvzf libs_env.tar.gz
tar -xvzf public.tar.gz
These two topics are splitted temporarily and will be reorganized.
The libs & env has kernel APIs, file system APIs, network APIs and so on.
Please find it under v1.1/libs_env/html folder and execute index.html.
The public has framework APIs like database - arastorage, Device Management, iotbus, SmartThings Things SDK, audio and wifi manager.
Please find it under v1.1/public/html folder and execute index.html.