Reading NTAG213/MifareClassic

[mbigant]

Hi,
I'm trying to read NTAG213 and MifareClassic card but issuing an java.lang.NullPointerException in AndroidNfcReaderAdapter.kt:94.
After some researches I found that tagTechnology is null and I notice that it is not set (like currentCardProtocol also) in every case in the onTagDiscovered method.

override fun onTagDiscovered(tag: Tag) {
    logger.info("{}: card discovered: {}", name, tag)
    isCardChannelOpen = false
    try {
      for (technology in tag.techList) when (technology) {
        IsoDep::class.qualifiedName -> {
          currentCardProtocol = IsoDep::class.qualifiedName!!
          tagTechnology = IsoDep.get(tag)
        }
        MifareUltralight::class.qualifiedName -> {
          currentCardProtocol = MifareUltralight::class.qualifiedName!!
          tagTechnology = MifareUltralight.get(tag)
        }
        NfcA::class.qualifiedName -> {
          val tagA = NfcA.get(tag)
          uid = tagA.tag.id
          powerOnData =
              JSONObject()
                  .put("type", "A")
                  .put("uid", HexUtil.toHex(uid))
                  .put("atqa", HexUtil.toHex(tagA.atqa))
                  .put("sak", HexUtil.toHex(tagA.sak))
                  .toString()
        }
        NfcB::class.qualifiedName -> {
          val tagB = NfcB.get(tag)
          uid = tagB.tag.id
          powerOnData =
              JSONObject()
                  .put("type", "B")
                  .put("uid", HexUtil.toHex(uid))
                  .put("applicationData", HexUtil.toHex(tagB.applicationData))
                  .put("protocolInfo", HexUtil.toHex(tagB.protocolInfo))
                  .toString()
        }
        else -> logger.warn("{}: unreachable code", name)
      }
      cardInsertionWaiterAsynchronousApi.onCardInserted()
    } catch (_: NoSuchElementException) {
      tagTechnology = null
      logger.warn("{}: unsupported card technology", name)
    }
  }

When matching NfcA or NfcB which is my case there is no tagTechnology affectation. Is there any reason ?

Thank you.