The API documentation is only urging caution because by setting cleanstart to true, the broker is being asked to violate the contract for assured delivery of QoS 1 and 2 messages.
API文档只是提醒要多加小心，因为当将cleanstart设置为true时，就要求代理违反确保QoS1和2消息传递的约定。
For sometime past we have been urging you for a punctual delivery.
曾几何时，我方一直催问你方准时交货。
For sometime past we have been urging you for a punctual delivery.
曾几何时，我方一直催问你方准时交货。
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