I have a few smoke and water alarms from the Elro Connects smarthome series of products. They connect to a Wifi hub (SF40GA).
I developed a binding for it. It works for the devices I have, but needs a lot more testing. I have programmed functionality for several other devices that work with the hub but could not test.
If you have devices and volunteer to test, you can find a beta version of the binding on the marketplace: Elro Connects Binding (Beta). You can install directly from openHAB (3.2.0).