Support for in-wall switches by Bosch or Homemate IP?

Bosch and Homemate IP make a series of nice in-wall switches and dimmers.

https://www.homematic-ip.com/en/products/detail/homematic-ip-dimming-actuator-for-brand-switches.html

The nice thing about this series is, that they also provide a series of adapters so that you can retrofit existing light switches and have the new smart light switches match the decor of the existing switches throughout the home.

Is is possible to integrate these devices into an openHAB setup?

It looks like you would need a supported bridge.

Note that the Bosch (rebranded homematic) switches are not compatible with the homematic binding, because they use an encrypted protocol. You’ll need the Bosch bridge and a separate binding for the Bosch API. This will be hopefully merged soon: https://github.com/openhab/openhab-addons/pull/8629