Hi Robert,
From your description, I suppose you want to filter the list item with the barcode value which scanned from the barcode scanner.
SharePoint does not provide such API to link to the external hardware devices, a custom solution would be required.
For this issue, the things below we need to consider:
1. Access SharePoint list with the SharePoint API.
url:
http://site url/_api/web/lists/GetByTitle(Test')/items
method: GET
headers:
Authorization: "Bearer " + accessToken
accept: "application/json;odata=verbose" or "application/atom+xml"
2. Access barcode scanner with the scanner API.
Since this part is not the area of SharePoint, you can post a question to a forum for the scanner. More experts will assist you, then you will get more
information.
Best regards,
Linda Zhang