payload method
Implementation
@override
Map<String, Object?> payload() => {
'entityUpdates': entityUpdates.map((e) => e.toMap()).toList(),
'entityFirings': entityFirings.map((e) => e.toMap()).toList(),
'systemFirings': systemFirings.map((e) => e.toMap()).toList(),
if (droppedFirings > 0) 'droppedFirings': droppedFirings,
};