Added class to get timestamps from NTP server

src/connections.cpp

@@ -121,7 +121,7 @@ Serial.println("receiving light treshold...");
     if (err == DeserializationError::Ok) {
       int nm = doc["nm"];
       int minLX = doc["minLX"];
-      setLightningProperties(nm, minLX);
+      setLightProperties(nm, minLX);
     } else {
       Serial.println(err.c_str());
     }

src/header.h

@@ -15,6 +15,7 @@
 #include <WiFi.h>
 #include <WebServer.h> 
 #include <AutoConnect.h>
+#include "time.h"
 
 // fix for core panic during wifi initialization
 #define configMINIMAL_STACK_SIZE 4096
@@ -87,12 +88,20 @@ extern void setValueNM(int NM);
 extern void getColorBasedOnValueNM(int valueNM);
 extern void triggerLight();
 
+// NTP Timestamps
+void printTimestamp();
+void setupNTP();
+bool checkForDay();
+int getCurrentHour();
+
 // sensors
 void readSensors();
 void toggleValve();
 void setSoilProperties(int FC, int PWP, int SAT);
 void setupStore();
-void setLightningProperties(int NM, int minLX);
+void setLightProperties(int NM, int minLX);
+void restoreLightProbs();
+void persistLightProps(int NM, int minLX);
 
 void takeSemaphore();
 void releaseSemaphore();

src/lightChecker.cpp

@@ -31,7 +31,6 @@ void setupPWM() {
 
 void setValueNM(int NM) {
     getColorBasedOnValueNM(NM);
-    // TODO: add persistenz for colorCounter
 }
 
 void getColorBasedOnValueNM(int valueNM) {
@@ -75,6 +74,7 @@ bool activateLight() {
 }
 
 void lightTask(void *parameter) {
+    takeSemaphore();
     unsigned long lightTimeoutTimer = millis();
     if (lightActive == false) {
         lightActive = activateLight();
@@ -82,6 +82,8 @@ void lightTask(void *parameter) {
         }
         lightActive = shutdownLight();
     }
+    releaseSemaphore();
+    vTaskDelete(NULL);
 }
 
 void triggerLight() {

src/main.cpp

@@ -29,6 +29,7 @@ void setup() {
   setupPWM();
   setupTemperatureSensor();
   setupCapacitiveSoilMoistureSensor();
+  setupNTP();
   // esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * 1000000);
   Serial.println("Setup complete...");
   Serial.println();

src/ntpManager.cpp

@@ -0,0 +1,41 @@
+#include <header.h>
+
+const char* ntpServer = "pool.ntp.org";
+const long gmtOffset_sec = 3600;
+const int daylightOffset_sec = 3600;
+
+// start and end hour of the date
+const int dayStart = 8;
+const int dayEnd = 20;
+struct tm timeinfo;
+
+void setupNTP() {
+    if (WiFi.isConnected()) {
+      Serial.println("WiFi OK. Getting Timestamp");
+      configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
+      printTimestamp();
+    }
+}
+
+bool checkForDay() {
+    printTimestamp();
+    if((getCurrentHour() > dayStart) && (getCurrentHour() < dayEnd)) {
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
+int getCurrentHour() {
+  int currentHour = timeinfo.tm_hour;
+  return currentHour;
+}
+
+void printTimestamp() {
+  if(!getLocalTime(&timeinfo)){
+    Serial.println("Failed to obtain time");
+    return;
+  }
+  Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
+}

src/peripherals.cpp

@@ -29,7 +29,7 @@ void readSensors() {
   Serial.print(lxValue);
   Serial.println(" lx");
   doc["brightness"] = lxValue;
-  if(lxValue < minimumLightValueLX) {
+  if((lxValue < minimumLightValueLX) && checkForDay()) {
     triggerLight();
   }
   //sprintf(buffer, "%f", lxValue);
@@ -98,7 +98,7 @@ void toggleValve() {
   xTaskCreate(
       valveTask,   /* Task function. */
       "valveTask", /* String with name of task. */
-      2048,       /* Stack size in bytes. */
+      2048,        /* Stack size in bytes. */
       NULL,        /* Parameter passed as input of the task */
       1,           /* Priority of the task. */
       NULL);       /* Task handle. */
@@ -142,6 +142,7 @@ void restoreSoilProps() {
 void setupStore() {
   NVS.begin("store");
   restoreSoilProps();
+  restoreLightProbs();
 }
 
 void setSoilProperties(int FC, int PWP, int SAT) {
@@ -157,11 +158,38 @@ void setSoilProperties(int FC, int PWP, int SAT) {
   Serial.println(soilSaturation);
 }
 
-void setLightningProperties(int NM, int minLX) {
-  setValueNM(NM);
-  minimumLightValueLX = minLX;
-  Serial.print("new minimum Light Value LX: ");
-  Serial.println(minimumLightValueLX);
-  // TODO: add Persistenz for minLX
+void persistLightProps(int NM, int minLX) {
+  takeSemaphore();
+  Serial.println("persistSoilProps");
+  bool n = NVS.setInt("nanoMeter", NM);
+  bool m = NVS.setInt("minimumLux", minLX);
+  if (n && m) {
+    Serial.println("Light properties sucessfully stored.");
+    NVS.commit();
+  }
+  else {
+    Serial.println("error occured while trying to persist soil properties");
+  }
+  releaseSemaphore();
 }
 
+void restoreLightProbs() {
+  Serial.println("restoreLightProps");
+  int nm = NVS.getInt("nanoMeter");
+  int minLX = NVS.getInt("minimumLux");
+  if (nm != 0) {
+    setValueNM(nm);
+  }
+  if (minLX != 0) {
+    minimumLightValueLX = minLX;
+  }
+  Serial.print(minimumLightValueLX);
+}
+
+void setLightProperties(int NM, int minLX) {
+  setValueNM(NM);
+  minimumLightValueLX = minLX;
+  persistLightProps(NM, minLX);
+  Serial.print("new minimum Light Value LX: ");
+  Serial.println(minimumLightValueLX);
+}