This shall be populated with a value from the OperationalStateEnum.
Optional
operationalThis field shall be present if the OperationalStateID is from the set reserved for Manufacturer Specific States, otherwise it shall NOT be present. If present, this shall contain a human-readable description of the operational state.
The OperationalStateStruct is used to indicate a possible state of the device.
See
MatterSpecification.v13.Cluster § 1.14.4.2