Problems retrieving information from equipment for later use

[Boolean2023]

As indicated in the documentation, I've used the WebSerial package to get around the limitations of usb on windows. When I add the device for the first time, everything works correctly and I get to print. except that in the receiptPrinter.addEventListener it detects an object with the values verdorID and productID set to null.
{ “type": ‘serial’, “vendorId": null, “productId": null, “language": null, “codepageMapping": null }
and after refreshing the web page, it automatically disconnects. is there any specific configuration to do after adding the printer?