Originally Posted By: Dignan
there is absolutely no migration path from a 100% ZWave-based system to a Homekit system. Homekit doesn't talk to any of the ZWave controllers because they don't have the authentication chip in them

Are you sure? I have a couple of Z-Wave Modules to switch the lights in my garden via a Raspberry Pi running OpenHAB. There is a HomeKit Addon which I think will expose the system to your iOS devices if you set it up correctly. I haven't personally played with it but it sounds promising.
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Hussein