android - How can I reconnect to IsoDep tag? -


i'm trying send apdu commands android phone nfc tag , answers. type of used technology isodep. works fine, sometimes, when time between sending commands large, tag switches disabled state , after every reconnection fails.

my code:

public byte[] transfercommand(byte[] command) throws exception {         byte[] result = null;         if (iso == null)   {             iso = isodep.get(tag);             iso.connect();         }         if (!iso.isconnected()) {             try {                 iso.close();                 iso.connect();                 result = iso.transceive(command);             } catch (exception ex) {                 iso.close();             }         }                     return result;     }

could me please? thank much.

the connect , related commands managing logical connection tag. is: grant thread , application exclusive access tag object. don't physical tag connection. (at least far know, it's been while since last read nfcservice code).

therefore connecting , reconnecting not once tag stops answer requests. can in case physically remove tag , present reader again.

if run timeout problems try raising timeout value calling settimeout on tag object.


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