Overview of System Communication and Data Exchange:

1. User Authentication:

   • The user accesses the mobile application and authenticates either with their credentials or through a third-party identity provider.
   • The mobile application sends a request to the AWS Cognito service, which verifies the user's identity and issues a token.

2. Communication with EC2 Instance:

   • The mobile application utilizes the token to communicate with the EC2 Instance, responsible for running the application logic and handling user requests.
   • The EC2 Instance also interacts with the DynamoDB service to store and retrieve data generated by the system.

3. Device Control through Mobile Application:

   • Users can view and control devices connected to the system through the mobile application.
   • The mobile application sends commands to the EC2 Instance, which forwards them to the IoT Core service.

4. Secure Communication via IoT Core:

   • The IoT Core service facilitates secure communication between the cloud and devices using the MQTT protocol.
   • Devices publish and subscribe to messages on different topics, allowing for reliable data exchange.

5. Message Processing and Data Flow:

   • Devices send sensor readings and status updates to the cloud, receiving commands and configuration settings in return.
   • The EC2 Instance processes data from both the mobile application and devices, updating the DynamoDB service accordingly.

6. Real-time Data Display on Mobile Application:

   • The mobile application displays real-time data to the user, providing insights into the status of connected devices and system activities.

This system architecture ensures seamless communication and data exchange between the mobile application, cloud services, and connected devices, offering users a responsive and interactive experience.