EngrealSun

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http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718099 The MQTT protocol allows discarding messages with a QoS equal to 0。 You can switch to a different MQTT broker or specify the QoS。

因为创建流式计算的子查询中有过滤条件 voltage