NdefMessage addTextRecord maxing out.

[tgikal]

I'm trying to write to a NTAG215, which has around 504 bytes of usable memory, yet I can only seem to use 227 (255 with headers ect.) bytes with the message.addTextRecord(input) function.

Basically I have something that looks like this:

#include <SPI.h>
#include <PN532_SPI.h>
#include <PN532.h>   // The following files are included in the libraries Installed
#include <NfcAdapter.h>

PN532_SPI pn532spi(SPI, 10);
NfcAdapter nfc = NfcAdapter(pn532spi);  // Indicates the Shield you are using
String input;

void setup(void) {
  while (!Serial); // for Leonardo/Micro/Zero
  Serial.begin(9600);
  Serial.println("READY"); // Header used when using the serial monitor
  nfc.begin();
}
void loop(void) {
  while(Serial.available() > 1) {
    input = Serial.readString(); } // read the incoming data as string

  if (input.indexOf("write") >= 0) {
    if (nfc.tagPresent()) {
      NdefMessage message = NdefMessage();
      input.remove(0,6);
      message.addTextRecord(input); // Text Message you want to Record
      boolean success = nfc.write(message);
      if (success) {
          Serial.println("COMPLETE"); // if it works you will see this message 
      } else {
          Serial.println("FAILED"); } // If the the rewrite failed you will see this message
    }
  } // End of write
  while (nfc.tagPresent()); // Wait for tag removal
  input = "";
}

Which works fine, until I exceed 227 characters.

Any ideas?

[tgikal]

I found it in the MifareUltralight.cpp, #define ULTRALIGHT_MAX_PAGE 63 was limiting the tag to 63 pages (~252 bytes), I changed it to #define ULTRALIGHT_MAX_PAGE 135 and it seems to be working.

[tgikal]

That actually only bumped it up to 260 characters before something else is maxing out, basically it crashes the arduino if you go higher.

[rrakso]

@tgikal hmm, this issue (#60) seem to be alittle bit similar. I will try to figure something out.