This app was created for testing purposes using the MQTT protocol.
Subscribe to the specified topic and generate notifications based on MQTT messages every 30 seconds.

Key features:
1. Subscribe to messages via MQTT protocol
2. Alarm occurs every 30 seconds
3. Automatically runs when the smartphone boots (automatically starts even without running the app)
4. Even if the app is closed, it continues to run in the background
5. Detect network status and automatically reconnect
6. Notification when unsubscribing x