I have finally achieved simple functionality on the website. The whole project is hosted on my personal website, since I still have resources like databases available. The data is stored in a MySQL database which supports multiple users. There are a lot of features that I would like to have, but so far there are just a few things available: some diagnostics, user selection, simple error handling and most importantly a shopping list display. Apart from the user pages, there are a couple of others that will be accessed by the tags in order to change the status of the item or configure the tag. Here is how my list looks now, I have added just some random things:

The other functionality is to show the status of all the tags for a certain user. For now the information contained is the HW ID of the tag, status, battery status and when it was last changed by the tag or website