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wifi模块用mqtt库连接阿里云的物联网平台出错,总是报MQTT库里的错(MQTTExcepetion: 2)
你先在电脑上,用mosquitto测试,代码里注释有命令步骤。
测过了,用mosquitto连接电脑成功的,但是连接阿里云是不行的,连接会报错