my English is unfortunately not so good, please forgive me.
I have some qustions. I will buy a RaspBerry Pi 3, a GPIO Homematic receiver and a zWave USB Stick. Ist it possible to use both with the RaspBerry in openHAB? And is it possible to mix the protocols? Some example:
I will use a zWave Motiondetector and will control a Homematic thing. I hope you understand me and can give me some short ansewers.
this works perfectly with openhab. Thats what openhab infact is made for, communications between things over different protocols.
But you should check if your homematic GPIO controller and ZWave Usb Stick are Supported by the Homematic and ZWave bindings.
What Controllers you want to use?
You will have to use homegear (https://www.homegear.eu/index.php/Main_Page) in order to communicate with your devices via the RPi addon. Homegear as a server will act as “virtual CCU”. Homegear and the HomeMatic binding are working perfectly together
You will find a lot of good tutorials on the web in order to get it up and running