We would like to build an application on an iphone or ipad that sends commands relating to stock movements to our Erply inventory database (see Erply API [url removed, login to view]) . A typical command would be "2 boxes of x moved from warehouse to shop". This can be done with barcodes or something more simple. Whatever works best and cheapest.
Erply has native support for EAN 13 barcodes, so it would be useful to develop the app with something the iPhone codeREADr app.