Characteristic not in required or optional characteristics for service.
I caught this warning recently:

> HAP Warning: Characteristic E863F10D-079E-48FF-8F27-9C2605A29F52 not in required or optional characteristics for service 00000047-0000-1000-8000-0026BB765291. Adding anyway.

Not an error, just a warning. **Does not affect functionality**. It just fills half of the Homebridge log at startup and other warnings or errors might be unvisible compared to this.