StateHistory.fromJson constructor
      
      StateHistory.fromJson(
    
    
- Map json_
Implementation
StateHistory.fromJson(core.Map json_)
    : this(
        state: json_['state'] as core.String?,
        stateMessage: json_['stateMessage'] as core.String?,
        stateStartTime: json_['stateStartTime'] as core.String?,
      );