To save you time, here is the final working solution:
If you encounter issues with the JLSSP driver link, here are some common problems and solutions: jlspp driver link
When you plug a USB-to-Parallel adapter (used to connect old printers to modern laptops) into a Windows 10 or 11 PC, the operating system does not have native drivers for the generic chip. Consequently, Windows labels it as "JLSpp" in the device manager. Understanding JLSSP Driver Link
// Close the serial port serialPort.close();Generic Driver: Look for "Microsoft" as the manufacturer and select "Standard Serial over Bluetooth link". Why is this happening? Conclusion: The Final Working JLSpp Driver Link To