PDF print from NetSuite to HP Printer -- 2

Hi, We are in need of a functionality to automatically print the Packing Slip (from an item fulfilment) from NetSuite via our HP printer. Currently we print out these PDF documents by hand, but we need to automate this. We are using NetSuite WMS, and once an item fulfilment changes status from "Picked" to "Packed", it needs to automatically print out the PDF.

If you have an idea on how to achieve this, please let me know!