connection complete event
连接完成事件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The MQTT client tracks any publications that were in flight in the event of a connection failure, and it attempts to complete the message delivery upon reconnection.
MQTT 客户机可跟踪连接故障时的所有发布，并试图一旦重建连接就即刻完成消息传递。
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