toJson method
Returns the information stored in this object in a way the it could be
encoded via jsonEncode()
.
Implementation
@override
Map<String, dynamic> toJson() {
final Map<String, dynamic> newJson = super.toJson();
newJson[BrokerKeys.messageType] = BrokerKeys.getValueReply;
newJson[BrokerKeys.value] = value;
return newJson;
}