Check barcode value against a CSV file.
We do not have an out-of-the-box solution for this scenario but if your CSV is not changing very frequently then I think you can embed CSV values inside your app (using a script) and compare the scanned value with that embedded list.
The downside of this approach is: If you need to change your CSV values you need to re-publish your app (which is quite easier though in SNAP).
Assuming the CSV file exists locally on the device where the app will be, there is a way to pull the contents of local files into a Snap app which can then be used to compare against the scanned barcode. It requires a bit of customization but can be achieved.
I have left you a private message to discuss this further in detail.
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