Jchmmy
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Jchmmy
串口显示的消息是这样的（mqtt实用的阿里云的物联网平台） Attempting MQTT connection...[E][WiFiGeneric.cpp:739] hostByName(): DNS Failed for iot-*********a38aax.mqtt.iothub.aliyuncs.com failed, rc=-2 不知道怎么解决