[Documentation] Multiple device types per enpoint?

[olavt]

[Documentation] Multiple device types per enpoint?

[jvmahon]

As an initial point, Zap lets you do a lot of stuff that doesn't strictly conform with the Matter specs (at least it didn't in earlier versions - I haven't checked lately). So Zap permitting it doesn't make it conforming.

Section 9.2 ("Endpoint Composition") of the Matter Specification Version 1.2 addresses the type of combination you are attempting. This is the statement:

Sensors are simple endpoints in the Matter data model, and since none of the sensor types you are combining have all the clusters of the other types (i.e., none of the types is a superset of the others), you should not combining them on the same endpoint. Each should be its own Endpoint with its specific application device type.

The ability to combine multiple types on one endpoint is likely to be rare. An example that comes to mind is for Color Dimmer Switch, Dimmer Switch, and On/Off Switch. If Color Dimmer Switch is the Primary, you can put "Dimmer Switch" or "On/Off Switch" as secondary. This is allowed since Color Dimmer Switch contains all the clusters of Dimmer Switch and On/Off Switch. Similarly, if you put "Dimmer Switch" as Primary, then "On/Off Switch" is permitted as the secondary since Dimmer contains all its clusters, but Color Dimmer Switch would not since Dimmer is missing the color control cluster. I'd say never do such combining if you can avoid it - setting up discrete endpoints is comparatively easy.