Table 3.

Summary of the main components used in the system.

Component	Functionality
UniversAAL API	Provides the necessary methods for client–server communication between the application and the universAAL service. Handles all communications through a REST API.
UniversAAL service	Manages the sending of data between the UniversAAL server and the application through the use of POST, UPDATE and DELETE methods.
FHIR Standard	Provides a standard for the exchange of patient data.
FHIR Transformer	Makes use of the standard libraries to transform the data. It is responsible for the correct verification of the data before it can be sent to the server.
Data Storage	Provide persistence to the application thanks to the use of a local database in SQLite.
Data Service	Provides the necessary libraries for the use of methods related to the persistence of data with the Entity Framework.
IoT sensor	It is responsible for collecting the data of each patient.