These are optional features supported by KeypadInputCluster.
MatterSpecification.v13.Cluster ยง 6.8.4
LocationKeys (LK)
Supports CEC keys 0x0A (Settings) and 0x09 (Home)
NavigationKeyCodes (NV)
Supports UP, DOWN, LEFT, RIGHT, SELECT, BACK, EXIT, MENU
NumberKeys (NK)
Supports numeric input 0..9
These are optional features supported by KeypadInputCluster.
See
MatterSpecification.v13.Cluster ยง 6.8.4