Good Morning all 
I was wondering if there is sth like described in the title available on the market. Since i did not find anything on my own i was hoping to get a more educated opinion on the topic from someone who has a better overview about the available devices and implementations.
Lets get to the situation: I wanna make a connection between a lightbulb (wired with a relay) and a switch and it should work even when my openhab server (or any other hub) is down 
Thank you for reading and to all who contribute to this forum!
Does it have to be a relay? For example, you can directly pair IKEA Tradfri remotes with Tradfri bulbs (Zigbee protocol).
Apologies for the in flight edits. My original question was whether the OP already had a relay.
I don’t have a relay neither a switch but want to buy both if there’s a way to get it work like described
So is IKEA an option for you? Here’s a kit, or you can buy the switch and bulb separately if you need a different bulb type…
Yeah this seems to fit perfectly. Thank you so much! 
One option in Germany would be Homematic. In the case of Homematic it’s possible to connect buttons directly to other components (relays, switches, thermostats, etc…) or via a central unit called CCU. If you connect components directly they will work even if the CCU and openHAB are down, I never tested if that also works if you establish the connection via the CCU 
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