Because I am very forgetful, I had to search briefly in the forum.
If you enter 5 zeros (00000) instead of the five-digit code for the inclusion, then the wall plug should be included unsecure.
And if the flood sensor is also included unsecure, or the flood sensor is included secure and parameter 78 is adjusted, then it’s possible to you use associations like @Osorkon mentioned.
With other SmartHome gateways it’s possible to choose the devices should be to included securely or unsecure, but not (yet) with Homey. That is why @Edwin_D has made a request:
