From 8df7a49a0e45b45f8c69e425bf7e00ae06efb15d Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Sun, 9 Nov 2025 16:43:56 +0100
Subject: [PATCH] initial support for OpenPrint Tag NDEF records.  See: 
 https://github.com/prusa3d/Prusa-Firmware-Buddy/blob/openprinttag/src/module/nfc/openprinttag/openprinttag

---
 CHANGELOG.md          |  1 +
 client/src/nfc/ndef.c | 23 ++++++++++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 601440064..56e383be5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Added identification of NDEF/Open print tag record (@iceman1001)
 - Added support for Bruce dump files [.rfid] (@iceman1001)
 - Added script `read_t-union.py` (@klks)
 - Added better ECP configuration aliases (@kormax)
diff --git a/client/src/nfc/ndef.c b/client/src/nfc/ndef.c
index 61a032218..6acf53cc0 100644
--- a/client/src/nfc/ndef.c
+++ b/client/src/nfc/ndef.c
@@ -42,6 +42,8 @@
 #define NDEF_BLUEAPPL_LE        "application/vnd.bluetooth.le.oob"
 #define NDEF_BLUEAPPL_SECURE_LE "application/vnd.bluetooth.secure.le.oob"
 
+#define NDEF_OPENPRINT_TAG   "application/vnd.openprinttag"
+
 #define NDEF_ANDROID_PROVISION   "application/com.android.managedprovisioning"
 #define NDEF_IMAGE               "image/"
 
@@ -828,6 +830,19 @@ static int ndefDecodeMime_wifi_p2p(NDEFHeader_t *ndef) {
     return PM3_SUCCESS;
 }
 
+static int ndefDecodeMime_openprint_tag(NDEFHeader_t *ndef) {
+    if (ndef->PayloadLen == 0) {
+        PrintAndLogEx(INFO, "no payload");
+        return PM3_SUCCESS;
+    }
+
+    PrintAndLogEx(INFO, _CYAN_("NDEF Open Print Tag Record"));
+    PrintAndLogEx(INFO, "Type............ " _YELLOW_("%.*s"), (int)ndef->TypeLen, ndef->Type);
+    PrintAndLogEx(INFO, "to be implemented, feel free to contribute!");
+    return PM3_SUCCESS;
+}
+
+
 static int ndefDecodeMime_vcard(NDEFHeader_t *ndef) {
     if (ndef->PayloadLen == 0) {
         PrintAndLogEx(INFO, "no payload");
@@ -1090,20 +1105,23 @@ static int ndefDecodePayload(NDEFHeader_t *ndef, bool verbose) {
             if (str_startswith(begin, NDEF_WIFIAPPL_WSC)) {
                 ndefDecodeMime_wifi_wsc(ndef);
             }
+
             if (str_startswith(begin, NDEF_WIFIAPPL_P2P)) {
                 ndefDecodeMime_wifi_p2p(ndef);
             }
+
             if (str_startswith(begin, NDEF_VCARDTEXT) || str_startswith(begin, NDEF_XVCARDTEXT)) {
                 ndefDecodeMime_vcard(ndef);
             }
 
-
             if (str_startswith(begin, NDEF_BLUEAPPL_EP)) {
                 ndefDecodeMime_bt(ndef);
             }
+
             if (str_startswith(begin, NDEF_BLUEAPPL_SECURE_LE)) {
                 ndefDecodeMime_bt_secure_le_oob(ndef);
             }
+
             if (str_startswith(begin, NDEF_BLUEAPPL_LE)) {
                 ndefDecodeMime_bt_le_oob(ndef);
             }
@@ -1120,6 +1138,9 @@ static int ndefDecodePayload(NDEFHeader_t *ndef, bool verbose) {
                 ndefDecodeMime_image(ndef);
             }
 
+            if (str_startswith(begin, NDEF_OPENPRINT_TAG)) {
+                ndefDecodeMime_openprint_tag(ndef);
+            }
             free(begin);
             begin = NULL;
             break;