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在mattclient.h中,定义了枚举类型typedef enum mqtt_qos {QOS0 = 0,QOS1 = 1,QOS2 = 2,SUBFAIL = 0x80} mqtt_qos_t;后面的代码中,对QoS有个指针强转,而enum的长度并不固定,有一定的概率引起非对齐访问的问题。