bool Adafruit_PN532::readPassiveTargetID(uint8_t cardbaudrate, uint8_t *uid, uint8_t *uidLength, uint8_t *sak, uint16_t timeout)
{
  volatile bool bRes = 0x00;

  pn532_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET;
  pn532_packetbuffer[1] = 1; // max 1 cards at once (we can set this to 2 later)
  pn532_packetbuffer[2] = cardbaudrate;

  //Send Command and dont wait until PN532 is ready
  sendCommandCheckAck(pn532_packetbuffer, 3, 2, 1);

  //inlist not sent -> send
  //this results in an RF field reset, which is needed by some tags to get recognized.
  pn532_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET;
  pn532_packetbuffer[1] = 1; // max 1 cards at once (we can set this to 2 later)
  pn532_packetbuffer[2] = cardbaudrate;

  //Send Command and dont wait until PN532 is ready
  if (!sendCommandCheckAck(pn532_packetbuffer, 3, timeout, 1))

  ...