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If you have a network connection between the reader and the database than it does not matter if they are in the same room or in different countries.
Using a VPN does imply that your network is set up in a way that the network traffic from the reader to the database has to pass through the VPN tunnel. On the database server you will have access to the database listener.
I haven't yet worked with the Streams Dispatcher but I worked with the HTTP dispatcher. I send the packets to a JSP application running on the application server and this wrote the content into the database.