In BOS, the basic unit of data for user operations is object. Each object contains Key, Meta and Data. Key is the name of object. Meta is the user's description of the object and consists of a series of Name-Value pairs. Data is the data of the object.
Object Relational Mapping
Objects in the program are automatically persisted to the database by using the mapping relationship between the described objects and the database.
Operation privilege on the topic. Currently based on the MQTT protocol, the IoT Hub supports two privileges, i.e. PUBLISH and SUBSCRIBE.