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We need a simple bluetooth device which should have the following features & functionalities:
1. Connect to 12v power source & become available when scanned by other bluetooth enabled devices
2. The device is kind of sensor which will help our application identify if the sensor is on or off, we will identify the sensor by its mac id.
3. There is nothing else that the device will do except from becoming available or unavailable.
This device has to do nothing but just become available while scanning bluetooth so the BOM needs to be kept low.