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mqtt,设备的在线状态怎么根据状态变换？
设备在线状态只与数据点在采集周期内是否上数有关，数据点上数在线 不上数设备离线。
数据点采集周期是在哪里查看，我有一个设备周期较长显示的就是离线
表配置的设备配置中
