It should work like this:
The person reads the label on the bottle with a cell phone and saves it.
Saving creates a space in the app on the phone.
Then, when placing it in the cellar, there is a switch in position.
When placing the bottle in the cellar, the cellar "system" identifies that a bottle has been placed in the XY position and sends this information to the application on the cell phone.
As a space was created with the label, this XY position is saved together in the position of the bottle label data.
So when you click on the label on the app again, the cell phone sends the "address" XY to the cellar system, which then flashes the location of the bottle.