net.codecrete.usb.UsbTimeoutException: transfer IN on endpoint 2 failed about javadoesusb HOT 3 OPEN

package net.codecrete.usb.examples;

import net.codecrete.usb.Usb;
import net.codecrete.usb.UsbDevice;

import net.codecrete.usb.UsbDirection;

import net.codecrete.usb.UsbRequestType;

import java.io.IOException;

import java.util.HexFormat;
import java.lang.Thread;  

/**
 * Sample application monitoring USB devices as they are connected and disconnected.
 */
public class Monitor
{


    // -- Canon LBP-810
    private static final int VID = 0x04a9;  // Canon
    private static final int PID = 0x260a;  // LBP-810
    

    // -- Keyboard, VID: 0x1c4f, PID: 0x0002, manufacturer: SIGMACHIP, product: USB Keyboard, serial: null, ID: 4294992995
    //private static final int VID = 0x1c4f;
    //private static final int PID = 0x0002;

    private static final int INTERFACE_NO = 0;
    private static final int ENDPOINT_OUT = 1;
    private static final int ENDPOINT_IN = 2;



    public static void main(String[] args) throws IOException, InterruptedException
    {


        /*System.out.println("-- INFO. START list all devices");
        for (var device : Usb.getAllDevices()) {
            System.out.println(device);
        }
        System.out.println("-- INFO. END list all devices");*/




        // register callbacks for events
        Usb.setOnDeviceConnected(device    -> printDetails(device, "Connected"));
        Usb.setOnDeviceDisconnected(device -> printDetails(device, "Disconnected"));

        // display the already present USB devices
        for (var device : Usb.getDevices()) {
            printDetails(device, "Present");
        }


        // wait for ENTER to quit program
        System.out.println("-- INFO: Monitoring... Press ENTER to quit.");
        System.in.read();
    }




    private static void printDetails(UsbDevice device, String event)
    {
        System.out.printf("%-14s", event + ":");
        System.out.println(device.toString());
        //System.out.println( device.getProductId() );

        // VID: 0x04a9, PID: 0x260a, manufacturer: Canon, product: Canon CAPT USB Printer, serial: 5922JB45, ID: 4294973486
        if ( ( device.getVendorId() == 0x04a9 ) &&
             ( device.getProductId() == 0x260a )
        ) {
          System.out.println( "-- INFO: Canon CAPT USB Printer.");
        }


        if (event.toString() == "Connected") {

          var optionalDevice = Usb.findDevice(VID, PID);
          if (optionalDevice.isEmpty()) {
              System.out.printf("-- INFO: No USB device with VID=0x%04x and PID=0x%04x found.%n", VID, PID);
          } else {
              System.out.printf("-- INFO: USB device with VID=0x%04x and PID=0x%04x found.%n", VID, PID);





              var device2 = optionalDevice.get();


              System.out.printf("getManufacturer:%s\n", device2.getManufacturer());  // "Canon"
              System.out.printf("getProduct:%s\n", device2.getProduct());  // "Canon CAPT USB Printer"
              System.out.printf("getSerialNumber:%s\n", device2.getSerialNumber());  // "5922JB45"
              System.out.printf("getUsbVersion:%s\n", device2.getUsbVersion());  // "1.1.0"
              System.out.printf("getDeviceVersion:%s\n", device2.getDeviceVersion());  // "1.0.0"


              device2.open();

              device2.claimInterface(INTERFACE_NO);



              try {  


                int i;
                for (i = 0; i < 120; i++) {



                  // -- PAPER READY
                  // -- 0xa0, 0xa0, 0, 2);
                  // -- 0xa1, 0xa0, 0, 2);
                  // // d0 00 00 02 b0 09 b3 0d ,  7d 00 [fd|00] 00 00 00 00 00
                  // if 0xFD -> paper ready
                  byte[] data1 = HexFormat.ofDelimiter(":").parseHex("a0:a0:00:02:a1:a0:00:02");


                  /*
                  outb(0x7f,LPPORT);
                  outb(0xbf,LPPORT);
                  outb(0x4f,LPPORT);
                  outb(0x80,LPPORT);
                  */
                  //byte[] data1 = HexFormat.ofDelimiter(":").parseHex("7f:bf:4f:80");  //

                  // -- test CF, LF
                  //byte[] data1 = HexFormat.ofDelimiter(":").parseHex("0d:0a:0d:0a");  //
                  //byte[] data1 = HexFormat.ofDelimiter(":").parseHex("7f:bf:4f:80:0d:0a");  // 0d 0a


                  device2.transferOut(ENDPOINT_OUT, data1);
                  System.out.println(data1.length + " bytes sent.");


                  //Thread.sleep(1000);

                  /*byte[] data2 = HexFormat.ofDelimiter(":").parseHex("a1:a0:00:02");
                  device2.transferOut(ENDPOINT_OUT, data2);
                  System.out.println(data2.length + " bytes sent.");*/


                  //Thread.sleep(1000);

                  //device2.clearHalt(OUT, 1);


                  // --
                  
                  // -- https://javadoc.io/doc/net.codecrete.usb/java-does-usb/latest/net.codecrete.usb/net/codecrete/usb/UsbDevice.html


                  /*byte[] data_cti = controlTransferIn(STANDARD, 255);
                  System.out.println(data_cti.length + " bytes received.");*/

                  // -- TODO: waits forever
                  byte[] data_r;
                  data_r = device2.transferIn(ENDPOINT_IN, 8000);
                  System.out.println(data_r.length + " bytes received.");
                  //System.out.println("Data:" + data_r.data);

                  /*if (cmdbuffer[1][10] == 0xfd) {
                    return 1;
                  }*/

                  // --
                  if (i == 0) {
                    System.out.println("Waiting for paper...");
                  }

                  // -- wait 
                  Thread.sleep(1000);
                  //Thread.sleep(10000);
                  //usleep(1000000);

                }
              } catch (Exception e) {
                System.out.println(e);
              }
              
              

              device2.close();

          }

        }


    }

}