wbackup83

It works like a charm! thanks again for your kind support...I really appreciated

This works if I put the tag on the reader when i run the main... What i need is to scan and be active for other tags ... for this reason I don't understand where to put the loop ...

can you please attach the code or paste it?

Nope...it does not enter in the state ...never..

I attach the java file so you can try it if you want

thanks again for the support

ExampleScanForTags.java

https://www.amazon.it/gp/product/B01FLOQNMI/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

I have these... I tried with another tag of the same brand and it's the same...

If you intend as it is reported there with the print of the state commented, NO, I do not get any state at all...

What i would expect it would be to access the STATE_AUTHENTICATING_MIFARE_CLASSIC_PAGE_READY state after calling authenticateMifareClassicPage(). But this does not happen...

Thanks for the reply...but it is the same: it always returns the same page with different tags and the other states are never accessed.

nr.addStateChangedListener(new BrickletNFCRFID.StateChangedListener() {

            public void stateChanged(short state, boolean idle) {

            //System.out.println(state);

                try {

                    if(idle) {

                        currentTagType = 0;

                        //(short)((currentTagType + 1) % 3);

                        nr.requestTagID(currentTagType);

                    }

                    if(state == BrickletNFCRFID.STATE_REQUEST_TAG_ID_READY) {

                        BrickletNFCRFID.TagID tagID = nr.getTagID();

                        String s = "Found tag of type " + tagID.tagType +

                                  " with ID [" + Integer.toHexString(tagID.tid[0]);

                        for(int i = 1; i < tagID.tidLength; i++) {

                            s += " " + Integer.toHexString(tagID.tid);

                        }

                        s += "]";

                        System.out.println(s);

                        //added code

                        short[] keys= {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

nr.authenticateMifareClassicPage(5, (short) 0,keys);

nr.requestPage(5);

short[] data=nr.getPage();

System.out.println(Arrays.toString(data));

                    } 

                    if(state == BrickletNFCRFID.STATE_AUTHENTICATING_MIFARE_CLASSIC_PAGE_READY) {

                    System.out.println("Ready");

                    }

                    if(state == BrickletNFCRFID.STATE_AUTHENTICATING_MIFARE_CLASSIC_PAGE_ERROR) {

                    System.out.println("error");

                    }

                } catch(Exception e) {

                    System.out.println(e);

                }

            }

        });

        // Start scan loop

        nr.requestTagID(BrickletNFCRFID.TAG_TYPE_MIFARE_CLASSIC);

        System.out.println("Press key to exit"); System.in.read();

        ipcon.disconnect();

I don't understand why using a mifare tag using the provided code i can read the tag page without authenticating ...moreover the state page ready is never accessed... for this reason the page if i change the tag still remains the same...

can you take a look at my code to understand if i m missing something or what?

Tags are found, i can print the page content without authenticating it...(commented)

public class ExampleScanForTags {

    private static final String HOST = "localhost";

    private static final int PORT = 4223;

    // Change XYZ to the UID of your NFC/RFID Bricklet

    private static final String UID = "uqB";

    private static short currentTagType = 0;

    // Note: To make the example code cleaner we do not handle exceptions. Exceptions

    //      you might normally want to catch are described in the documentation

    public static void main(String args[]) throws Exception {

        IPConnection ipcon = new IPConnection(); // Create IP connection

        // Note: Declare nr as final, so the listener can access it

        final BrickletNFCRFID nr = new BrickletNFCRFID(UID, ipcon); // Create device object

        ipcon.connect(HOST, PORT); // Connect to brickd

        // Don't use device before ipcon is connected

        // Add state changed listener

        nr.addStateChangedListener(new BrickletNFCRFID.StateChangedListener() {

            public void stateChanged(short state, boolean idle) {

            //System.out.println(state);

                try {

                    if(idle) {

                        currentTagType = 0;

                        //(short)((currentTagType + 1) % 3);

                        nr.requestTagID(currentTagType);

                    }

                    if(state == BrickletNFCRFID.STATE_REQUEST_TAG_ID_READY) {

                        BrickletNFCRFID.TagID tagID = nr.getTagID();

                        String s = "Found tag of type " + tagID.tagType +

                                  " with ID [" + Integer.toHexString(tagID.tid[0]);

                        for(int i = 1; i < tagID.tidLength; i++) {

                            s += " " + Integer.toHexString(tagID.tid);

                        }

                        s += "]";

                        System.out.println(s);

                        //added code

                        short[] keys= {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

//nr.authenticateMifareClassicPage(5, (short) 0,keys);

short[] data=nr.getPage();

System.out.println(Arrays.toString(data));

                    } 

                    if(state == BrickletNFCRFID.STATE_AUTHENTICATING_MIFARE_CLASSIC_PAGE_READY) {

                    System.out.println("Ready");

                    }

                    if(state == BrickletNFCRFID.STATE_AUTHENTICATING_MIFARE_CLASSIC_PAGE_ERROR) {

                    System.out.println("error");

                    }

                } catch(Exception e) {

                    System.out.println(e);

                }

            }

        });

        // Start scan loop

        nr.requestTagID(BrickletNFCRFID.TAG_TYPE_MIFARE_CLASSIC);

        System.out.println("Press key to exit"); System.in.read();

        ipcon.disconnect();

    }

}

Thanks i managed to reset it with an android app...

I ve made a mistake...i wrote on the first page of the tag and now the reading returns error 196. Also using brickv says tag found but i can't write tag. Is there a way to reset the tag or it s just dead?