Further improvements on NFC writing

Fixes some issues related to tag writing. Allos writing of tags that are already on the scale when pressing the write button, but introduces a confirmation dialog before doing so. Also first test to fix reset issue when trying to write tags.

html/rfid.js

@@ -7,6 +7,7 @@ let heartbeatTimer = null;
 let lastHeartbeatResponse = Date.now();
 const HEARTBEAT_TIMEOUT = 20000;
 let reconnectTimer = null;
+let spoolDetected = false;
 
 // WebSocket Funktionen
 function startHeartbeat() {
@@ -508,12 +509,15 @@ function updateNfcStatusIndicator(data) {
     if (data.found === 0) {
         // Kein NFC Tag gefunden
         indicator.className = 'status-circle';
+        spoolDetected = false;
     } else if (data.found === 1) {
         // NFC Tag erfolgreich gelesen
         indicator.className = 'status-circle success';
+        spoolDetected = true;
     } else {
         // Fehler beim Lesen
         indicator.className = 'status-circle error';
+        spoolDetected = true;
     }
 }
 
@@ -618,6 +622,7 @@ function updateNfcData(data) {
 }
 
 function writeNfcTag() {
+    if(!spoolDetected || confirm("Are you sure you want to overwrite the Tag?") == true){
         const selectedText = document.getElementById("selected-filament").textContent;
         if (selectedText === "Please choose...") {
             alert('Please select a Spool first.');
@@ -667,8 +672,10 @@ function writeNfcTag() {
             alert('Not connected to Server. Please check connection.');
         }
     }
+}
 
 function writeLocationNfcTag() {
+    if(!spoolDetected || confirm("Are you sure you want to overwrite the Tag?") == true){
         const selectedText = document.getElementById("locationSelect").value;
         if (selectedText === "Please choose...") {
             alert('Please select a location first.');
@@ -679,6 +686,7 @@ function writeLocationNfcTag() {
             location: String(selectedText)
         };
 
+
         if (socket?.readyState === WebSocket.OPEN) {
             const writeButton = document.getElementById("writeLocationNfcButton");
             writeButton.classList.add("writing");
@@ -692,6 +700,7 @@ function writeLocationNfcTag() {
             alert('Not connected to Server. Please check connection.');
         }
     }
+}
 
 function handleWriteNfcTagResponse(success) {
     const writeButton = document.getElementById("writeNfcButton");

src/nfc.cpp

@@ -20,6 +20,7 @@ String lastSpoolId = "";
 String nfcJsonData = "";
 bool tagProcessed = false;
 volatile bool pauseBambuMqttTask = false;
+volatile bool suspendNfcReading = false;
 
 struct NfcWriteParameterType {
   bool tagType;
@@ -278,8 +279,10 @@ void writeJsonToTag(void *parameter) {
   Serial.println(params->payload);
 
   nfcReaderState = NFC_WRITING;
-  vTaskSuspend(RfidReaderTask);
-  vTaskDelay(50 / portTICK_PERIOD_MS);
+  suspendNfcReading = true;
+  //vTaskSuspend(RfidReaderTask);
+  // make sure to wait 600ms, after that the reading task should be waiting
+  vTaskDelay(1000 / portTICK_PERIOD_MS);
 
   //pauseBambuMqttTask = true;
   // aktualisieren der Website wenn sich der Status ändert
@@ -372,7 +375,8 @@ void writeJsonToTag(void *parameter) {
   sendWriteResult(nullptr, success);
   sendNfcData();
 
-  vTaskResume(RfidReaderTask);
+  suspendNfcReading = false;
+  //vTaskResume(RfidReaderTask);
   pauseBambuMqttTask = false;
 
   vTaskDelete(NULL);
@@ -384,7 +388,7 @@ void startWriteJsonToTag(const bool isSpoolTag, const char* payload) {
   parameters->payload = strdup(payload);
   
   // Task nicht mehrfach starten
-  if (nfcReaderState == NFC_IDLE) {
+  if (nfcReaderState == NFC_IDLE || nfcReaderState == NFC_READ_ERROR || nfcReaderState == NFC_READ_SUCCESS) {
     oledShowProgressBar(0, 1, "Write Tag", "Place tag now");
     // Erstelle die Task
     xTaskCreate(
@@ -405,7 +409,7 @@ void scanRfidTask(void * parameter) {
   Serial.println("RFID Task gestartet");
   for(;;) {
     // Wenn geschrieben wird Schleife aussetzen
-    if (nfcReaderState != NFC_WRITING)
+    if (nfcReaderState != NFC_WRITING && !suspendNfcReading)
     {
       yield();
 
@@ -413,7 +417,7 @@ void scanRfidTask(void * parameter) {
       uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID
       uint8_t uidLength;
 
-      success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength, 1000);
+      success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength, 500);
 
       foundNfcTag(nullptr, success);
       
@@ -430,7 +434,7 @@ void scanRfidTask(void * parameter) {
 
         oledShowProgressBar(0, octoEnabled?5:4, "Reading", "Detecting tag");
 
-        vTaskDelay(500 / portTICK_PERIOD_MS);
+        //vTaskDelay(500 / portTICK_PERIOD_MS);
         
         if (uidLength == 7)
         {
@@ -487,7 +491,7 @@ void scanRfidTask(void * parameter) {
         }
       }
 
-      if (!success && nfcReaderState != NFC_IDLE)
+      if (!success && nfcReaderState != NFC_IDLE && !suspendNfcReading)
       {
         nfcReaderState = NFC_IDLE;
         //uidString = "";
@@ -500,6 +504,12 @@ void scanRfidTask(void * parameter) {
       // aktualisieren der Website wenn sich der Status ändert
       sendNfcData();
     }
+    else
+    {
+      // TBD: Debug only:
+      Serial.println("NFC Reading disabled");
+      vTaskDelay(1000 / portTICK_PERIOD_MS);
+    }
     yield();
   }
 }