Data generated from heterogeneous IoT devices in the smart home is transmitted to the smart home gateway consisting of various sizes and data types. The smart home gateway of the proposed architecture needs to accurately control IoT and process data according to the user’s request. The figure highlighted below describes the process of data transfer from IoT to the smart home gateway, where data processing is divided into three categories: collection, preprocessing, and hashing.

Stage 1:- Collecting:

Data generated by the device is communicated with the router for a specific time. When new data is needed at the gateway or when an event occurs, data is requested from the device. Raw data is then sent and stored in the storage device at the gateway.

Stage 2:- Preprocessing:

Raw data sent from the device is preprocessed inside the gateway. For the efficiency of storage space, it filters and stores only the data needed by the router based on device ID and is stored using the standardization and classification process.

Stage 3:- Hashing:

Data generated in the smart home contains sensitive information of the user so that it can be managed through encryption. The SHA256 algorithm is applied based on the password specified by the user, and the common data of the device is stored through the hash function.