Need help with 433 MHz door Contact

i have installt openhab on my Raspberry,
at first I control 2 lights with a 433 MHz Adapter.
No problems with that.

But now I will see and get a Massage when some open the Backdoor.
I haf a door Contact, and with Rfsnifer i can get the signal…
But I can’t find a easy How-To?
Maby someone knows where/or how I do that?!