Not able to selectApplication via TapLinx SDK

Sarfraz1 — Mon, 13 Jun 2022 00:36:47 GMT

Hi,

We are trying to develop an integrated application for saving data on cards in text format. For this purpose trying with TapLinx. As far as I understood from "Starting Development with Taplinx SDK" we can read and write data on Desfire v1 8k tag in NDEF format.

I used Desfire Ev1 8K tags in which we store text data using TagXplorer-v1.2. Now when trying to read data using TapLinx SDK. Can connect to the reader using TapLinxTest-Desktop app. Able to get application ids (as an example "0x9f7870"), but when try to selectApplication with this Id we get exception "Application not found". Below is the code I tried. I need your help!!!

desfire.selectApplication( 0 );
try
{
desfire.authenticate( 0, IDESFireEV1.AuthType.Native, KeyType.THREEDES, m_2k3desDef );
}
catch( Exception e )
{ // No default PICC Master Key
logWindow.append( e.getMessage() + "\n" );
bSuccess = false;
}
int[] appIds = desfire.getApplicationIDs();
if(appIds.length==0)
return bReturn;

byte[] bappId=intToBytes(appIds[0]);
try
{
// byte[] fileIds=desfire.readData(arg0, arg1, arg2)
desfire.selectApplication(bappId);
}
catch (Exception e)
{
return bReturn;
}

Re: Not able to selectApplication via TapLinx SDK

Fabian_R — Wed, 15 Jun 2022 17:07:42 GMT

Hello sir,

Is there any particular reason you are using MIFARE cards instead of on an NTAG device? MIFARE products may require an NDA and, if you are only interested in writing NDEF messages I would strongly recommend the option of using NTAG products.

I would like to invite you to check our NTAG portfolio, where you will find that NTAG 215 has 32-bit password protection and the interaction with any Android Phone will be much more agile since MIFARE cards are a more complex device intended for closed-loop micropayments and public transit usage.

If you could provide me with some more information regarding your application, I may provide a better help

Please let me know what are your thoughts.

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