MqttRpcDeviceReadCustomer 方法

读取自定义的数据类型，需要继承自IDataTransfer接口，返回一个新的类型的实例对象。
To read a custom data type, you need to inherit from the IDataTransfer interface and return an instance object of a new type.

读取自定义的数据类型，需要继承自IDataTransfer接口，传入一个实例，对这个实例进行赋值，并返回该实例的对象。
To read a custom data type, you need to inherit from the IDataTransfer interface, pass in an instance, assign a value to this instance, and return the object of the instance.