The homematic integration (via homegear rpc) doesn’t find the homematic keyring remotes HM-RC-4-3 (https://de.elv.com/homematic-funk-handsender-4-tasten-universal-hm-rc-4-3-fuer-smart-home-hausautomation-105397).
Documentation is avalable at https://files2.elv.com/public/10/1053/105397/Internet/105397_handsender_um.pdf .
The four keys should be avalable as entities so that they can be used in automations etc.
If requested I can provide support for testing, I have the HM-RC-4-3 devices available.
A little bit of searching would have produced this as a first result 
https://community.home-assistant.io/t/hm-rc-4-3-not-viewable-in-hass/184528/2
PS: Welcome to Home Assistant!
Thanks Pat, this should solve my problem. My search for homematic and HM-RC-4-3 didn’t find this topic.
No problem, let me know how you get on with it. I ordered one of them on a whim ages ago, but never found a use for it. So if you have any ideas I’d interested to hear about them.
I think the usual use case is the garage door opener. I use it to activate/deactivate an alarm system from outside.