chart data log function

include/CanGrow_Core.h

@@ -517,6 +517,37 @@ String Str_Epoch2Date(unsigned long epochTime) {
   return dateStr;
 }
 
+char* Char_Timestamp_yyyymmdd(const unsigned long timestamp) {
+  /* char length should be 9 at the end */
+  
+  char tmp_month[3];
+  char tmp_day[3];
+  char tmp_minute[3];
+  static char tmp_timestamp[12];
+  
+  if(month(timestamp) < 10) {
+    snprintf(tmp_month, sizeof(tmp_month), "0%d", month(timestamp));
+  } else {
+    snprintf(tmp_month, sizeof(tmp_month), "%d", month(timestamp));
+  }
+  
+  if(day(timestamp) < 10) {
+    snprintf(tmp_day, sizeof(tmp_day), "0%d", day(timestamp));
+  } else {
+    snprintf(tmp_day, sizeof(tmp_day), "%d", day(timestamp));
+  }
+  
+  if(minute(timestamp) < 10) {
+    snprintf(tmp_minute, sizeof(tmp_minute), "0%d", minute(timestamp));
+  } else {
+    snprintf(tmp_minute, sizeof(tmp_minute), "%d", minute(timestamp));
+  }
+  
+  snprintf(tmp_timestamp, sizeof(tmp_timestamp), "%d%s%s_%s", year(), tmp_month, tmp_day, tmp_minute);
+  
+  return tmp_timestamp;
+}
+
 
 /* Those two functions should be in LittleFS file, but because dependency and lazyness */
 void Time2FS_Save() {

include/CanGrow_LittleFS.h

@@ -723,6 +723,60 @@ bool SaveConfig(bool writeToSerial = false) {
   
 }
 
+
+/***************
+ * Dashboard Chart LittleFS functions
+ * Stuff for writing, rotating, deleting files
+ */
+
+void LFS_Chart_Log_Data(const byte chartId) {
+  const static char LogLoc[] PROGMEM = "[LittleFS:Chart_Log_Data]";
+  /* sensor data is in directory /d/ */
+  char fullpath[24]; //18
+  char tmp_message[32];
+  char tmp_floatChar[16]; // = "12.34";
+  float tmp_float = Sensor_getCalibratedValue(config.grow.dashboard.chartSensor[chartId], config.grow.dashboard.chartRead[chartId]);
+  unsigned long timeNow = now();
+  
+  /* build full path - looks like /d/0_1/20250420 */
+  snprintf(fullpath, sizeof(fullpath), "/chart/%d/%s", chartId, Char_Timestamp_yyyymmdd(timeNow));
+  /* build message
+   * https://forum.arduino.cc/t/sprintf-a-float-number/1013193/5 */
+  dtostrf(tmp_float, 2, 2, tmp_floatChar);
+  snprintf(tmp_message, sizeof(tmp_message), "%lu;%s", timeNow, tmp_floatChar);
+  
+  
+  
+  Log.notice(F("%s fullpath: %s, message: %s" CR), LogLoc, fullpath, tmp_message);
+  
+  #ifdef ESP8266
+  File file = LittleFS.open(fullpath, "a");
+  #endif
+  
+  #ifdef ESP32
+  fs::FS &fs = LittleFS;
+  File file = fs.open(fullpath, FILE_APPEND);
+  #endif
+
+  if (!file) {
+    Log.error(F("%s Failed to open file for appending %s" CR), LogLoc, fullpath);
+    return;
+  }
+  if (file.print(tmp_message)) {
+    #ifdef DEBUG
+    Log.notice(F("%s File appended %s" CR), LogLoc, fullpath);
+    #endif
+  } else {
+    Log.error(F("%s Failed to append file %s" CR), LogLoc, fullpath);
+  }
+  file.close();
+}
+
+void LFS_Chart_Dirlist_Data() {
+  const static char LogLoc[] PROGMEM = "[LittleFS:Chart_Dirlist_Data]";
+  
+}
+
 ///*
  //* ESP8266 functions
  //*/

include/CanGrow_Timer.h

@@ -43,7 +43,8 @@ void Timer_3s() {
   #ifdef DEBUG2
   Log.verbose(F("%s" CR), LogLoc);
   #endif
-  
+  if(config.grow.dashboard.chartConfigured[0] == true)
+    LFS_Chart_Log_Data(0);
 }
 
 void Timer_5s() {
@@ -57,5 +58,6 @@ void TimeR_Init() {
   timer.setInterval(1000, Timer_Output);
   timer.setInterval(1000, Timer_Sensor);
   timer.setInterval(100, Timer_Control);
+  timer.setInterval(30000, Timer_3s);
   
 }

include/CanGrow_Webserver.h

@@ -107,6 +107,7 @@ void Webserver_Init() {
   /* DEBUG only - offer config for direct download */
   #ifdef DEBUG
   webserver.serveStatic(CANGROW_CFG, LittleFS, CANGROW_CFG);
+  webserver.serveStatic("/d/1_1/20250408_1", LittleFS, "/d/1_1/20250408_1");
   #endif
   
   /* 404 Error page */