Memory leak fixes in api and nfc, location tag fix

Fixes multiple potential memory leaks in API and NFC. Also fixes an issue in the new locaiton tag feature that could lead to multiple parallel API requests. This could cause memory leak issues but also result in wrong weights being registered for a spool.

src/api.cpp

@@ -2,6 +2,7 @@
 #include <HTTPClient.h>
 #include <ArduinoJson.h>
 #include "commonFS.h"
+#include "debug.h"
 
 volatile spoolmanApiStateType spoolmanApiState = API_INIT;
 //bool spoolman_connected = false;
@@ -87,6 +88,8 @@ JsonDocument fetchSingleSpoolInfo(int spoolId) {
 }
 
 void sendToApi(void *parameter) {
+    HEAP_DEBUG_MESSAGE("sendToApi begin");
+
     spoolmanApiState = API_TRANSMITTING;
     SendToApiParams* params = (SendToApiParams*)parameter;
 
@@ -131,8 +134,8 @@ void sendToApi(void *parameter) {
             }
             
             vTaskDelay(3000 / portTICK_PERIOD_MS);
-            doc.clear();
         }
+        doc.clear();
 
     } else {
         Serial.println("Fehler beim Senden an Spoolman! HTTP Code: " + String(httpCode));
@@ -145,8 +148,9 @@ void sendToApi(void *parameter) {
 
     // Speicher freigeben
     delete params;
-    vTaskDelete(NULL);
+    HEAP_DEBUG_MESSAGE("sendToApi end");
     spoolmanApiState = API_IDLE;
+    vTaskDelete(NULL);
 }
 
 bool updateSpoolTagId(String uidString, const char* payload) {
@@ -169,6 +173,8 @@ bool updateSpoolTagId(String uidString, const char* payload) {
     Serial.print("Update Spule mit URL: ");
     Serial.println(spoolsUrl);
     
+    doc.clear();
+
     // Update Payload erstellen
     JsonDocument updateDoc;
     updateDoc["extra"]["nfc_id"] = "\""+uidString+"\"";
@@ -207,6 +213,7 @@ bool updateSpoolTagId(String uidString, const char* payload) {
 }
 
 uint8_t updateSpoolWeight(String spoolId, uint16_t weight) {
+    HEAP_DEBUG_MESSAGE("updateSpoolWeight begin");
     String spoolsUrl = spoolmanUrl + apiUrl + "/spool/" + spoolId + "/measure";
     Serial.print("Update Spule mit URL: ");
     Serial.println(spoolsUrl);
@@ -241,11 +248,14 @@ uint8_t updateSpoolWeight(String spoolId, uint16_t weight) {
     );
 
     updateDoc.clear();
+    HEAP_DEBUG_MESSAGE("updateSpoolWeight end");
 
     return 1;
 }
 
 uint8_t updateSpoolLocation(String spoolId, String location){
+    HEAP_DEBUG_MESSAGE("updateSpoolLocation begin");
+
     String spoolsUrl = spoolmanUrl + apiUrl + "/spool/" + spoolId;
     Serial.print("Update Spule mit URL: ");
     Serial.println(spoolsUrl);
@@ -281,6 +291,7 @@ uint8_t updateSpoolLocation(String spoolId, String location){
 
     updateDoc.clear();
 
+    HEAP_DEBUG_MESSAGE("updateSpoolLocation end");
     return 1;
 }
 
@@ -345,6 +356,10 @@ bool updateSpoolBambuData(String payload) {
 
     String updatePayload;
     serializeJson(updateDoc, updatePayload);
+
+    doc.clear();
+    updateDoc.clear();
+
     Serial.print("Update Payload: ");
     Serial.println(updatePayload);
 
@@ -511,6 +526,7 @@ bool checkSpoolmanExtraFields() {
                     vTaskDelay(100 / portTICK_PERIOD_MS);
                 }
             }
+            doc.clear();
         }
     }
     
@@ -557,6 +573,8 @@ bool checkSpoolmanInstance(const String& url) {
                 oledShowTopRow();
                 return strcmp(status, "healthy") == 0;
             }
+
+            doc.clear();
         }
     } else {
         Serial.println("Error contacting spoolman instance! HTTP Code: " + String(httpCode));
@@ -584,6 +602,8 @@ bool saveSpoolmanUrl(const String& url, bool octoOn, const String& octoWh, const
     octoUrl = octoWh;
     octoToken = octoTk;
 
+    doc.clear();
+
     return true;
 }
 
@@ -600,6 +620,8 @@ String loadSpoolmanUrl() {
         return doc["url"].as<String>();
     }
     Serial.println("Keine gültige Spoolman-URL gefunden.");
+
+    doc.clear();
     return "";
 }
 

src/main.cpp

@@ -212,14 +212,14 @@ void loop() {
   lastWeight = weight;
 
   // Wenn ein Tag mit SM id erkannte wurde und der Waage Counter anspricht an SM Senden
-  if (spoolId != "" && weigthCouterToApi > 3 && weightSend == 0 && nfcReaderState == NFC_READ_SUCCESS) {
+  if (activeSpoolId != "" && weigthCouterToApi > 3 && weightSend == 0 && nfcReaderState == NFC_READ_SUCCESS) {
     oledShowIcon("loading");
-    if (updateSpoolWeight(spoolId, weight)) 
+    if (updateSpoolWeight(activeSpoolId, weight)) 
     {
       oledShowIcon("success");
       vTaskDelay(2000 / portTICK_PERIOD_MS);
       weightSend = 1;
-      autoSetToBambuSpoolId = spoolId.toInt();
+      autoSetToBambuSpoolId = activeSpoolId.toInt();
 
       if (octoEnabled) 
       {

src/nfc.cpp

@@ -14,7 +14,8 @@ Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);
 TaskHandle_t RfidReaderTask;
 
 JsonDocument rfidData;
-String spoolId = "";
+String activeSpoolId = "";
+String lastSpoolId = "";
 String nfcJsonData = "";
 volatile bool pauseBambuMqttTask = false;
 
@@ -64,6 +65,8 @@ void payloadToJson(uint8_t *data) {
         Serial.print("deserializeJson() failed: ");
         Serial.println(error.f_str());
       }
+
+      doc.clear();
     } else {
         Serial.println("Kein gültiger JSON-Inhalt gefunden oder fehlerhafte Formatierung.");
         //writeJsonToTag("{\"version\":\"1.0\",\"protocol\":\"NFC\",\"color_hex\":\"#FFFFFF\",\"type\":\"Example\",\"min_temp\":10,\"max_temp\":30,\"brand\":\"BrandName\"}");
@@ -221,14 +224,15 @@ bool decodeNdefAndReturnJson(const byte* encodedMessage) {
     if (doc.containsKey("sm_id") && doc["sm_id"] != "") 
     {
       Serial.println("SPOOL-ID gefunden: " + doc["sm_id"].as<String>());
-      spoolId = doc["sm_id"].as<String>();
+      activeSpoolId = doc["sm_id"].as<String>();
+      lastSpoolId = activeSpoolId;
     }
     else if(doc.containsKey("location") && doc["location"] != "")
     {
       Serial.println("Location Tag found!");
       String location = doc["location"].as<String>();
-      if(spoolId != ""){
+      if(lastSpoolId != ""){
-        updateSpoolLocation(spoolId, location);
+        updateSpoolLocation(lastSpoolId, location);
       }
       else
       {
@@ -240,12 +244,14 @@ bool decodeNdefAndReturnJson(const byte* encodedMessage) {
     else 
     {
       Serial.println("Keine SPOOL-ID gefunden.");
-      spoolId = "";
+      activeSpoolId = "";
       oledShowMessage("Unknown Spool");
       vTaskDelay(2000 / portTICK_PERIOD_MS);
     }
   }
 
+  doc.clear();
+
   return true;
 }
 
@@ -446,6 +452,7 @@ void scanRfidTask(void * parameter) {
         nfcReaderState = NFC_IDLE;
         //uidString = "";
         nfcJsonData = "";
+        activeSpoolId = "";
         Serial.println("Tag entfernt");
         if (!autoSendToBambu) oledShowWeight(weight);
       }

src/nfc.h

@@ -19,7 +19,8 @@ void startWriteJsonToTag(const char* payload);
 
 extern TaskHandle_t RfidReaderTask;
 extern String nfcJsonData;
-extern String spoolId;
+extern String activeSpoolId;
+extern String lastSpoolId;
 extern volatile nfcReaderStateType nfcReaderState;
 extern volatile bool pauseBambuMqttTask;