Hi bestes, thanks for your quick response.
I am planning to use the Raspberry Pi as a "concentrator" for sensors and actuators, where this can be wired to the GPIO and/or accessed through a ZWAVE USB Stick.
So the RPi would be the zwave gateway (through the Stick) and also the main brain for the IoT solution.
Will try to post an image so to be more clear.
I would love to continue this topic giving you more details if you want and help you in any way to have Cayenne supporting Zwave.