This field shall be set to the state now in effect through the transition causing this event to be generated.
This field shall be set to the state that preceded the transition causing this event to be generated, if such a state existed. If no previous state exists, the value shall be Unknown.
This field shall be set to the reason why this event was generated.
This field shall be set to the target SoftwareVersion which is the subject of the operation, whenever the NewState is Downloading, Applying or RollingBack. Otherwise TargetSoftwareVersion shall be null.
Body of the OtaSoftwareUpdateRequestor stateTransition event
See
MatterSpecification.v13.Core § 11.20.7.7.1