as already posted everybody can now play with Z-Wave SDK, as it has been completely released to the public.   To make it bit easier here small how to:   1 - you need to register on silabs.com first 2 - you need the Z-Wave SDK 3 - you need Keil Compiler License 4 - you need proper Keil Version 5 - you need to setup few things 6 - playing with examples 7 - ... and now you can compile your first project 8 - test your first z-wave firmware