Hello, I have reasons to believe this issue is specific for serial printers, because the same code has been working perfectly for all other printers up until now.
Steps to reproduce:
I import USBPrinter and run init() method
I successfully find devices with getDeviceList method
I successfully connect to printer and confirm the access in the Android alert modal
I run any printing method (printBill, printText, printRaw...)
App crashes with this java error:
Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.bulkTransfer(android.hardware.usb.UsbEndpoint, byte[], int, int)' on a null object reference
at com.pinmi.react.printer.adapter.USBPrinterAdapter$2.run(USBPrinterAdapter.java:235)
at java.lang.Thread.run(Thread.java:919)
I have been stuck at this one for a while now, do you have any tips this type of error?
Hello, I have reasons to believe this issue is specific for serial printers, because the same code has been working perfectly for all other printers up until now.
Steps to reproduce:
I have been stuck at this one for a while now, do you have any tips this type of error?