<itemvalue="QOS Level 0 - Message is not guaranteed delivery. No retries are made to ensure delivery is successful."/>
<itemvalue="Sleep for the duration specified in [duration]. Use this with care, as no asynchronous operations can be processed in a isolate while it is blocked in a [sleep] call. ```dart var duration = const Duration(seconds: 5); print('Start sleeping'); sleep(duration); print('5 seconds has passed'); ```"/>
<itemvalue="Sleep for the duration specified in [duration]. Use this with care, as no asynchronous operations can be processed in a isolate while it is blocked in a [sleep] call. ```dart var duration = const Duration(seconds: 5); print('Start sleeping'); sleep(duration); print('5 seconds has passed'); ```"/>