Wounder if this will work with OpenHAB.
https://pro.hansgrohe.com/hansgrohe/new-products/pontos
Just took a look at that product, They seam to go out of their way to hide the technology it uses and only support the use of their OWN app. This leads me to believe it is a proprietary bluetooth or wifi device. I can’t find any reference to it being z-wave, or zigbee so it probably won’t work with anything except their app. You would need to contact them tho and find out. If it’s a standard like Zigbee/Zwave, then yes, it will work with openhab assuming profiles exist for the product. Otherwise you would have to get the tech/api info for product and write your own binding.