I'm not able to understand your query on "barcode to search items in a list". Please be a little more elaborate so that we can understand your use-case and provide help to resolve your query.
What we are trying to do is to read a barcode and find the item in a list that has that number as the primary key and show the information for that item.
Can you please let us know if the list of values is present under some external system or under SOTI Snap. And if its residing on an external system, how can that system communicate with SOTI Snap.