There can be multiple use cases right from particular grocery ordering through a button press, or your smart trash bin scans the barcode of the finished good packet which is just dumped there and add it in your grocery list through the app.
You can preheat your oven from the app just before reaching home. Or, you can check the temperature of our pan through the app. One can see the status of the RO filter or set the brewing time or dispense time of coffee machine through a smartphone. The app can also show alerts.
We at Mobiloitte can help you designing, integrating such BT or Wi-Fi enabled appliances and control them through a mobile app.