v0.8 Fix for interrupt process issue; Refactoring.

pom.xml

@@ -8,7 +8,7 @@
     <name>NS-USBloader</name>
 
     <artifactId>ns-usbloader</artifactId>
-    <version>0.7-SNAPSHOT</version>
+    <version>0.8-SNAPSHOT</version>
 
     <url>https://github.com/developersu/ns-usbloader/</url>
     <description>
@@ -218,11 +218,11 @@
                                 <minVersion>1.8</minVersion>
                             </jre>
                             <versionInfo>
-                                <fileVersion>0.7.0.0</fileVersion>
+                                <fileVersion>0.8.0.0</fileVersion>
                                 <txtFileVersion>${project.version}</txtFileVersion>
                                 <fileDescription>TinFoil and GoldLeaf installer for your NS</fileDescription>
                                 <copyright>GNU General Public License v3, 2019 ${organization.name}. Russia/LPR.</copyright>
-                                <productVersion>0.7.0.0</productVersion>
+                                <productVersion>0.8.0.0</productVersion>
                                 <txtProductVersion>${project.version}</txtProductVersion>
                                 <companyName>${organization.name}</companyName>
                                 <productName>${project.name}</productName>

src/main/java/nsusbloader/ModelControllers/LogPrinter.java

@@ -49,9 +49,12 @@ public class LogPrinter {
     /**
      * Update progress for progress bar
      * */
-    public void updateProgress(Double value) throws InterruptedException{
+    public void updateProgress(Double value) {
+        try {
             progressQueue.put(value);
         }
+        catch (InterruptedException ignored){}               // TODO: Do something with this
+    }
     /**
      * When we're done - update status
      * */

src/main/java/nsusbloader/NET/NETCommunications.java

@@ -374,23 +374,14 @@ public class NETCommunications extends Task<Void> { // todo: thows IOException?
                 }
                 currSockOS.write(byteBuf);
                 //-----------------------------------------/
-                try {
                 logPrinter.updateProgress((currentOffset+readPice)/(count/100.0) / 100.0);
-                }catch (InterruptedException ie){
-                    getException().printStackTrace();               // TODO: Do something with this
-                }
                 //-----------------------------------------/
                 currentOffset += readPice;
             }
             currSockOS.flush();         // TODO: check if this really needed.
             bis.close();
             //-----------------------------------------/
-            try{
             logPrinter.updateProgress(1.0);
-            }
-            catch (InterruptedException ie){
-                getException().printStackTrace();               // TODO: Do something with this
-            }
             //-----------------------------------------/
         }
         catch (IOException ioe){

src/main/java/nsusbloader/NSLMain.java

@@ -12,7 +12,7 @@ import java.util.Locale;
 import java.util.ResourceBundle;
 
 public class NSLMain extends Application {
-    public static final String appVersion = "v0.7";
+    public static final String appVersion = "v0.8";
     @Override
     public void start(Stage primaryStage) throws Exception{
         FXMLLoader loader = new FXMLLoader(getClass().getResource("/NSLMain.fxml"));

src/main/java/nsusbloader/USB/ITransferModule.java

@@ -0,0 +1,7 @@
+package nsusbloader.USB;
+
+import nsusbloader.NSLDataTypes.EFileStatus;
+
+public interface ITransferModule {
+    EFileStatus getStatus();
+}

src/main/java/nsusbloader/USB/TinFoil.java

@@ -0,0 +1,321 @@
+package nsusbloader.USB;
+
+import javafx.concurrent.Task;
+import nsusbloader.ModelControllers.LogPrinter;
+import nsusbloader.NSLDataTypes.EFileStatus;
+import nsusbloader.NSLDataTypes.EMsgType;
+import org.usb4java.DeviceHandle;
+import org.usb4java.LibUsb;
+
+import java.io.*;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.IntBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+
+/**
+ * Tinfoil processing
+ * */
+class TinFoil implements ITransferModule {
+    private LogPrinter logPrinter;
+    private DeviceHandle handlerNS;
+    private LinkedHashMap<String, File> nspMap;
+    private EFileStatus status = EFileStatus.FAILED;
+    private Task<Void> task;
+
+    TinFoil(DeviceHandle handler, LinkedHashMap<String, File> nspMap, Task<Void> task, LogPrinter logPrinter){
+        this.handlerNS = handler;
+        this.nspMap = nspMap;
+        this.task = task;
+        this.logPrinter = logPrinter;
+
+        logPrinter.print("============= TinFoil =============", EMsgType.INFO);
+
+        if (!sendListOfNSP())
+            return;
+
+        if (proceedCommands())                              // REPORT SUCCESS
+            status = EFileStatus.UPLOADED;     // Don't change status that is already set to FAILED
+    }
+    /**
+     * Send what NSP will be transferred
+     * */
+    private boolean sendListOfNSP(){
+        // Send list of NSP files:
+        // Proceed "TUL0"
+        if (writeUsb("TUL0".getBytes(StandardCharsets.US_ASCII))) {  // new byte[]{(byte) 0x54, (byte) 0x55, (byte) 0x76, (byte) 0x30}
+            logPrinter.print("TF Send list of files: handshake", EMsgType.FAIL);
+            return false;
+        }
+        else
+            logPrinter.print("TF Send list of files: handshake", EMsgType.PASS);
+        //Collect file names
+        StringBuilder nspListNamesBuilder = new StringBuilder();    // Add every title to one stringBuilder
+        for(String nspFileName: nspMap.keySet()) {
+            nspListNamesBuilder.append(nspFileName);   // And here we come with java string default encoding (UTF-16)
+            nspListNamesBuilder.append('\n');
+        }
+
+        byte[] nspListNames = nspListNamesBuilder.toString().getBytes(StandardCharsets.UTF_8);
+        ByteBuffer byteBuffer = ByteBuffer.allocate(Integer.BYTES).order(ByteOrder.LITTLE_ENDIAN);         // integer = 4 bytes; BTW Java is stored in big-endian format
+        byteBuffer.putInt(nspListNames.length);                                                             // This way we obtain length in int converted to byte array in correct Big-endian order. Trust me.
+        byte[] nspListSize = byteBuffer.array();                                                            // TODO: rewind? not sure..
+        //byteBuffer.reset();
+
+        // Sending NSP list
+        logPrinter.print("TF Send list of files", EMsgType.INFO);
+        if (writeUsb(nspListSize)) {                                           // size of the list we're going to transfer goes...
+            logPrinter.print("  [send list length]", EMsgType.FAIL);
+            return false;
+        }
+        logPrinter.print("  [send list length]", EMsgType.PASS);
+
+        if (writeUsb(new byte[8])) {                                           // 8 zero bytes goes...
+            logPrinter.print("  [send padding]", EMsgType.FAIL);
+            return false;
+        }
+        logPrinter.print("  [send padding]", EMsgType.PASS);
+
+        if (writeUsb(nspListNames)) {                                           // list of the names goes...
+            logPrinter.print("  [send list itself]", EMsgType.FAIL);
+            return false;
+        }
+        logPrinter.print("  [send list itself]", EMsgType.PASS);
+
+        return true;
+    }
+    /**
+     * After we sent commands to NS, this chain starts
+     * */
+    private boolean proceedCommands(){
+        logPrinter.print("TF Awaiting for NS commands.", EMsgType.INFO);
+
+        /*  byte[] magic = new byte[4];
+            ByteBuffer bb = StandardCharsets.UTF_8.encode("TUC0").rewind().get(magic); // Let's rephrase this 'string'
+        */
+        final byte[] magic = new byte[]{(byte) 0x54, (byte) 0x55, (byte) 0x43, (byte) 0x30};  // eq. 'TUC0' @ UTF-8 (actually ASCII lol, u know what I mean)
+
+        byte[] receivedArray;
+
+        while (true){   // Check if user interrupted process.
+
+            receivedArray = readUsb();
+
+            if (receivedArray == null)      // catches error
+                return false;
+
+            if (!Arrays.equals(Arrays.copyOfRange(receivedArray, 0,4), magic))      // Bytes from 0 to 3 should contain 'magic' TUC0, so must be verified like this
+                continue;
+
+            // 8th to 12th(explicits) bytes in returned data stands for command ID as unsigned integer (Little-endian). Actually, we have to compare arrays here, but in real world it can't be greater then 0/1/2, thus:
+            // BTW also protocol specifies 4th byte to be 0x00 kinda indicating that that this command is valid. But, as you may see, never happens other situation when it's not = 0.
+            if (receivedArray[8] == 0x00){                           //0x00 - exit
+                logPrinter.print("TF Received 'EXIT' command. Terminating.", EMsgType.PASS);
+                return true;                     // All interaction with USB device should be ended (expected);
+            }
+            else if ((receivedArray[8] == 0x01) || (receivedArray[8] == 0x02)){           //0x01 - file range; 0x02 unknown bug on backend side (dirty hack).
+                logPrinter.print("TF Received 'FILE RANGE' command. Proceeding: [0x0"+receivedArray[8]+"]", EMsgType.PASS);
+                /*// We can get in this pocket a length of file name (+32). Why +32? I dunno man.. Do we need this? Definitely not. This app can live without it.
+                long receivedSize = ByteBuffer.wrap(Arrays.copyOfRange(receivedArray, 12,20)).order(ByteOrder.LITTLE_ENDIAN).getLong();
+                logsArea.appendText("[V] Received FILE_RANGE command. Size: "+Long.toUnsignedString(receivedSize)+"\n");            // this shit returns string that will be chosen next '+32'. And, BTW, can't be greater then 512
+                */
+                if (! fileRangeCmd())
+                    return false;      // catches exception
+            }
+        }
+    }
+    /**
+     * This is what returns requested file (files)
+     * Executes multiple times
+     * @return 'true' if everything is ok
+     *          'false' is error/exception occurs
+     * */
+    private boolean fileRangeCmd(){
+        byte[] receivedArray;
+        // Here we take information of what other side wants
+        receivedArray = readUsb();
+        if (receivedArray == null)
+            return false;
+
+        // range_offset of the requested file. In the begining it will be 0x10.
+        long receivedRangeSize = ByteBuffer.wrap(Arrays.copyOfRange(receivedArray, 0,8)).order(ByteOrder.LITTLE_ENDIAN).getLong();          // Note - it could be unsigned long. Unfortunately, this app won't support files greater then 8796093022208 Gb
+        byte[] receivedRangeSizeRAW = Arrays.copyOfRange(receivedArray, 0,8);                                                               // used (only) when we use sendResponse(). It's just simply.
+        long receivedRangeOffset = ByteBuffer.wrap(Arrays.copyOfRange(receivedArray, 8,16)).order(ByteOrder.LITTLE_ENDIAN).getLong();      // Note - it could be unsigned long. Unfortunately, this app won't support files greater then 8796093022208 Gb
+            /* Below, it's REAL NSP file name length that we sent before among others (WITHOUT +32 byes). It can't be greater then... see what is written in the beginning of this code.
+            We don't need this since in next pocket we'll get name itself UTF-8 encoded. Could be used to double-checks or something like that.
+            long receivedNspNameLen = ByteBuffer.wrap(Arrays.copyOfRange(receivedArray, 16,24)).order(ByteOrder.LITTLE_ENDIAN).getLong(); */
+
+        // Requesting UTF-8 file name required:
+        receivedArray = readUsb();
+        if (receivedArray == null)
+            return false;
+
+        String receivedRequestedNSP = new String(receivedArray, StandardCharsets.UTF_8);
+        logPrinter.print("TF Reply to requested file: "+receivedRequestedNSP
+                +"\n         Range Size:   "+receivedRangeSize
+                +"\n         Range Offset: "+receivedRangeOffset, EMsgType.INFO);
+
+        // Sending response header
+        if (!sendResponse(receivedRangeSizeRAW))   // Get receivedRangeSize in 'RAW' format exactly as it has been received. It's simply.
+            return false;
+
+        try {
+
+            BufferedInputStream bufferedInStream = new BufferedInputStream(new FileInputStream(nspMap.get(receivedRequestedNSP)));      // TODO: refactor?
+            byte[] bufferCurrent ;//= new byte[1048576];        // eq. Allocate 1mb
+
+            if (bufferedInStream.skip(receivedRangeOffset) != receivedRangeOffset){
+                logPrinter.print("TF Requested skip is out of file size. Nothing to transmit.", EMsgType.FAIL);
+                return false;
+            }
+
+            long currentOffset = 0;
+            // 'End Offset' equal to receivedRangeSize.
+            int readPice = 8388608;                     // = 8Mb
+
+            while (currentOffset < receivedRangeSize){
+                if ((currentOffset + readPice) >= receivedRangeSize )
+                    readPice = Math.toIntExact(receivedRangeSize - currentOffset);
+                //System.out.println("CO: "+currentOffset+"\t\tEO: "+receivedRangeSize+"\t\tRP: "+readPice);  // NOTE: DEBUG
+                // updating progress bar (if a lot of data requested) START BLOCK
+                //-----------------------------------------/
+                logPrinter.updateProgress((currentOffset+readPice)/(receivedRangeSize/100.0) / 100.0);
+                //-----------------------------------------/
+                bufferCurrent = new byte[readPice];                                                         // TODO: not perfect moment, consider refactoring.
+
+                if (bufferedInStream.read(bufferCurrent) != readPice) {                                      // changed since @ v0.3.2
+                    logPrinter.print("TF Reading of stream suddenly ended.", EMsgType.WARNING);
+                    return false;
+                }
+                //write to USB
+                if (writeUsb(bufferCurrent)) {
+                    logPrinter.print("TF Failure during NSP transmission.", EMsgType.FAIL);
+                    return false;
+                }
+                currentOffset += readPice;
+            }
+            bufferedInStream.close();
+            //-----------------------------------------/
+            logPrinter.updateProgress(1.0);
+            //-----------------------------------------/
+        } catch (FileNotFoundException fnfe){
+            logPrinter.print("TF FileNotFoundException:\n  "+fnfe.getMessage(), EMsgType.FAIL);
+            fnfe.printStackTrace();
+            return false;
+        } catch (IOException ioe){
+            logPrinter.print("TF IOException:\n  "+ioe.getMessage(), EMsgType.FAIL);
+            ioe.printStackTrace();
+            return false;
+        } catch (ArithmeticException ae){
+            logPrinter.print("TF ArithmeticException (can't cast 'offset end' - 'offsets current' to 'integer'):\n  "+ae.getMessage(), EMsgType.FAIL);
+            ae.printStackTrace();
+            return false;
+        }
+
+        return true;
+    }
+    /**
+     * Send response header.
+     * @return true if everything OK
+     *         false if failed
+     * */
+    private boolean sendResponse(byte[] rangeSize){                                 // This method as separate function itself for application needed as a cookie in the middle of desert.
+        logPrinter.print("TF Sending response", EMsgType.INFO);
+        if (writeUsb(new byte[] { (byte) 0x54, (byte) 0x55, (byte) 0x43, (byte) 0x30,    // 'TUC0'
+                (byte) 0x01,                                                // CMD_TYPE_RESPONSE = 1
+                (byte) 0x00, (byte) 0x00, (byte) 0x00,                      // kinda padding. Guys, didn't you want to use integer value for CMD semantic?
+                (byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00} )       // Send integer value of '1' in Little-endian format.
+        ){
+            logPrinter.print("  [1/3]", EMsgType.FAIL);
+            return false;
+        }
+        logPrinter.print("  [1/3]", EMsgType.PASS);
+        if(writeUsb(rangeSize)) {                                                          // Send EXACTLY what has been received
+            logPrinter.print("  [2/3]", EMsgType.FAIL);
+            return false;
+        }
+        logPrinter.print("  [2/3]", EMsgType.PASS);
+        if(writeUsb(new byte[12])) {                                                       // kinda another one padding
+            logPrinter.print("  [3/3]", EMsgType.FAIL);
+            return false;
+        }
+        logPrinter.print("  [3/3]", EMsgType.PASS);
+        return true;
+    }
+
+    /**
+     * Sending any byte array to USB device
+     * @return 'false' if no issues
+     *          'true' if errors happened
+     * */
+    private boolean writeUsb(byte[] message){
+        ByteBuffer writeBuffer = ByteBuffer.allocateDirect(message.length);   //writeBuffer.order() equals BIG_ENDIAN;
+        writeBuffer.put(message);                                             // Don't do writeBuffer.rewind();
+        IntBuffer writeBufTransferred = IntBuffer.allocate(1);
+        int result;
+
+        while (! task.isCancelled()) {
+            result = LibUsb.bulkTransfer(handlerNS, (byte) 0x01, writeBuffer, writeBufTransferred, 1000);  // last one is TIMEOUT. 0 stands for unlimited. Endpoint OUT = 0x01
+
+            switch (result){
+                case LibUsb.SUCCESS:
+                    if (writeBufTransferred.get() == message.length)
+                        return false;
+                    else {
+                        logPrinter.print("TF Data transfer issue [write]\n  Requested: "+message.length+"\n  Transferred: "+writeBufTransferred.get(), EMsgType.FAIL);
+                        return true;
+                    }
+                case LibUsb.ERROR_TIMEOUT:
+                    continue;
+                default:
+                    logPrinter.print("TF Data transfer issue [write]\n  Returned: "+ UsbErrorCodes.getErrCode(result), EMsgType.FAIL);
+                    logPrinter.print("TF Execution stopped", EMsgType.FAIL);
+                    return true;
+            }
+        }
+        logPrinter.print("TF Execution interrupted", EMsgType.INFO);
+        return true;
+    }
+    /**
+     * Reading what USB device responded.
+     * @return byte array if data read successful
+     *         'null' if read failed
+     * */
+    private byte[] readUsb(){
+        ByteBuffer readBuffer = ByteBuffer.allocateDirect(512);
+        // We can limit it to 32 bytes, but there is a non-zero chance to got OVERFLOW from libusb.
+        IntBuffer readBufTransferred = IntBuffer.allocate(1);
+
+        int result;
+        while (! task.isCancelled()) {
+            result = LibUsb.bulkTransfer(handlerNS, (byte) 0x81, readBuffer, readBufTransferred, 1000);  // last one is TIMEOUT. 0 stands for unlimited. Endpoint IN = 0x81
+
+            switch (result) {
+                case LibUsb.SUCCESS:
+                    int trans = readBufTransferred.get();
+                    byte[] receivedBytes = new byte[trans];
+                    readBuffer.get(receivedBytes);
+                    return receivedBytes;
+                case LibUsb.ERROR_TIMEOUT:
+                    continue;
+                default:
+                    logPrinter.print("TF Data transfer issue [read]\n  Returned: " + UsbErrorCodes.getErrCode(result), EMsgType.FAIL);
+                    logPrinter.print("TF Execution stopped", EMsgType.FAIL);
+                    return null;
+            }
+        }
+        logPrinter.print("TF Execution interrupted", EMsgType.INFO);
+        return null;
+    }
+
+    /**
+     * Status getter
+     * @return status
+     */
+    @Override
+    public EFileStatus getStatus() {
+        return status;
+    }
+}

src/main/java/nsusbloader/USB/UsbConnect.java

@@ -0,0 +1,183 @@
+package nsusbloader.USB;
+
+import nsusbloader.ModelControllers.LogPrinter;
+import nsusbloader.NSLDataTypes.EMsgType;
+import org.usb4java.*;
+
+class UsbConnect {
+    private final int DEFAULT_INTERFACE = 0;
+
+    private Context contextNS;
+    private DeviceHandle handlerNS;
+
+    private LogPrinter logPrinter;
+
+    private boolean connected;
+    
+    UsbConnect(LogPrinter logPrinter){
+        this.logPrinter = logPrinter;
+        this.connected = false;
+
+        int result;
+
+        // Creating Context required by libusb. Optional. TODO: Consider removing.
+        contextNS = new Context();
+        result = LibUsb.init(contextNS);
+        if (result != LibUsb.SUCCESS) {
+            logPrinter.print("libusb initialization\n  Returned: "+result, EMsgType.FAIL);
+            close();
+            return;
+        }
+        else
+            logPrinter.print("libusb initialization", EMsgType.PASS);
+
+        // Searching for NS in devices: obtain list of all devices
+        DeviceList deviceList = new DeviceList();
+        result = LibUsb.getDeviceList(contextNS, deviceList);
+        if (result < 0) {
+            logPrinter.print("Get device list\n  Returned: "+result, EMsgType.FAIL);
+            close();
+            return;
+        }
+        else
+            logPrinter.print("Get device list", EMsgType.PASS);
+        // Searching for NS in devices: looking for NS
+        DeviceDescriptor descriptor;
+        Device deviceNS = null;
+        for (Device device: deviceList){
+            descriptor = new DeviceDescriptor();                // mmm.. leave it as is.
+            result = LibUsb.getDeviceDescriptor(device, descriptor);
+            if (result != LibUsb.SUCCESS){
+                logPrinter.print("Read file descriptors for USB devices\n  Returned: "+result, EMsgType.FAIL);
+                LibUsb.freeDeviceList(deviceList, true);
+                close();
+                return;
+            }
+            if ((descriptor.idVendor() == 0x057E) && descriptor.idProduct() == 0x3000){
+                deviceNS = device;
+                logPrinter.print("Read file descriptors for USB devices", EMsgType.PASS);
+                break;
+            }
+        }
+        // Free device list.
+        if (deviceNS != null){
+            logPrinter.print("NS in connected USB devices found", EMsgType.PASS);
+        }
+        else {
+            logPrinter.print("NS in connected USB devices not found", EMsgType.FAIL);
+            close();
+            return;
+        }
+        // Handle NS device
+        handlerNS = new DeviceHandle();
+        result = LibUsb.open(deviceNS, handlerNS);
+        if (result != LibUsb.SUCCESS) {
+            logPrinter.print("Open NS USB device\n  Returned: "+UsbErrorCodes.getErrCode(result), EMsgType.FAIL);
+            if (result == LibUsb.ERROR_ACCESS)
+                logPrinter.print("Double check that you have administrator privileges (you're 'root') or check 'udev' rules set for this user (linux only)!\n\n" +
+                        "Steps to set 'udev' rules:\n" +
+                        "root # vim /etc/udev/rules.d/99-NS.rules\n" +
+                        "SUBSYSTEM==\"usb\", ATTRS{idVendor}==\"057e\", ATTRS{idProduct}==\"3000\", GROUP=\"plugdev\"\n" +
+                        "root # udevadm control --reload-rules && udevadm trigger\n", EMsgType.INFO);
+            // Let's make a bit dirty workaround since such shit happened
+            logPrinter.print("Requested context close", EMsgType.INFO);
+            LibUsb.exit(contextNS);
+            return;         // And close
+        }
+        else
+            logPrinter.print("Open NS USB device", EMsgType.PASS);
+
+        logPrinter.print("Free device list", EMsgType.INFO);
+        LibUsb.freeDeviceList(deviceList, true);
+
+        // DO some stuff to connected NS
+        // Check if this device uses kernel driver and detach if possible:
+        boolean canDetach = LibUsb.hasCapability(LibUsb.CAP_SUPPORTS_DETACH_KERNEL_DRIVER); // if cant, it's windows ot old lib
+        if (canDetach){
+            int usedByKernel = LibUsb.kernelDriverActive(handlerNS, DEFAULT_INTERFACE);
+            if (usedByKernel == LibUsb.SUCCESS)
+                logPrinter.print("Can proceed with libusb driver", EMsgType.PASS);   // we're good
+            else if (usedByKernel == 1) {      // used by kernel
+                result = LibUsb.detachKernelDriver(handlerNS, DEFAULT_INTERFACE);
+                logPrinter.print("Detach kernel required", EMsgType.INFO);
+                if (result != 0) {
+                    logPrinter.print("Detach kernel\n  Returned: " + UsbErrorCodes.getErrCode(result), EMsgType.FAIL);
+                    close();
+                    return;
+                }
+                else
+                    logPrinter.print("Detach kernel", EMsgType.PASS);
+            }
+            else
+                logPrinter.print("Can't proceed with libusb driver\n  Returned: "+UsbErrorCodes.getErrCode(usedByKernel), EMsgType.FAIL);
+        }
+        else
+            logPrinter.print("libusb doesn't support function 'CAP_SUPPORTS_DETACH_KERNEL_DRIVER'. It's normal. Proceeding.", EMsgType.WARNING);
+        /*
+        // Reset device
+        result = LibUsb.resetDevice(handlerNS);
+        if (result == 0)
+            logPrinter.print("Reset device", EMsgType.PASS);
+        else {
+            logPrinter.print("Reset device returned: " + result, EMsgType.FAIL);
+            updateAndClose();
+            return;
+        }
+        */
+        // Set configuration (soft reset if needed)
+        result = LibUsb.setConfiguration(handlerNS, 1);     // 1 - configuration all we need
+        if (result != LibUsb.SUCCESS){
+            logPrinter.print("Set active configuration to device\n  Returned: "+UsbErrorCodes.getErrCode(result), EMsgType.FAIL);
+            close();
+            return;
+        }
+        else
+            logPrinter.print("Set active configuration to device.", EMsgType.PASS);
+
+        // Claim interface
+        result = LibUsb.claimInterface(handlerNS, DEFAULT_INTERFACE);
+        if (result != LibUsb.SUCCESS) {
+            logPrinter.print("Claim interface\n  Returned: "+UsbErrorCodes.getErrCode(result), EMsgType.FAIL);
+            close();
+            return;
+        }
+        else
+            logPrinter.print("Claim interface", EMsgType.PASS);
+
+        this.connected = true;
+    }
+
+    /**
+     * Get USB status
+     * @return status of connection
+     */
+    boolean isConnected() { return connected; }
+    /**
+     * Getter for handler
+     * @return DeviceHandle of NS
+     */
+    DeviceHandle getHandlerNS(){ return handlerNS; }
+    /**
+     * Correct exit
+     * */
+    void close(){
+        // Close handler in the end
+        if (handlerNS != null) {
+            // Try to release interface
+            int result = LibUsb.releaseInterface(handlerNS, DEFAULT_INTERFACE);
+
+            if (result != LibUsb.SUCCESS)
+                logPrinter.print("Release interface\n  Returned: "+result+" (sometimes it's not an issue)", EMsgType.WARNING);
+            else
+                logPrinter.print("Release interface", EMsgType.PASS);
+
+            LibUsb.close(handlerNS);
+            logPrinter.print("Requested handler close", EMsgType.INFO);
+        }
+        // Close context in the end
+        if (contextNS != null) {
+            LibUsb.exit(contextNS);
+            logPrinter.print("Requested context close", EMsgType.INFO);
+        }
+    }
+}