added internet time which is shown in the main first screen

include/internet_time.h

@@ -0,0 +1,36 @@
+#ifndef INTERNET_TIME_H
+#define INTERNET_TIME_H
+
+#include <Arduino.h>
+
+struct InternetTimeInfo
+{
+  bool valid;
+  uint16_t year;
+  uint8_t month;
+  uint8_t day;
+  uint8_t hour;
+  uint8_t minute;
+};
+
+class InternetTime
+{
+public:
+  InternetTime();
+  void update(unsigned long now, bool wifiConnected);
+  InternetTimeInfo info() const;
+  bool consumeDirty();
+
+private:
+  void fetch(unsigned long now);
+  void updateCurrentTime(unsigned long now);
+  InternetTimeInfo infoFromEpoch(unsigned long epoch) const;
+
+  unsigned long lastEpoch_;
+  unsigned long lastSyncMillis_;
+  unsigned long nextAttempt_;
+  InternetTimeInfo current_;
+  bool dirty_;
+};
+
+#endif

include/screens.h

@@ -4,9 +4,11 @@
 #include <U8g2lib.h>
 
 #include "am2302_sensor.h"
+#include "internet_time.h"
 #include "wifi_connection.h"
 
-void drawScreen1(U8G2 &u8g2);
+void setInternetTimeInfo(InternetTimeInfo timeInfo);
+void drawTimeScreen(U8G2 &u8g2);
 void drawHelloWorldScreen(U8G2 &u8g2);
 void drawInternetConnectionScreen(U8G2 &u8g2, WifiConnectionInfo wifiInfo);
 void setEnvironmentReading(Am2302Reading reading);

include/wifi_credentials.example.h

@@ -4,4 +4,7 @@
 const char WIFI_SSID[] = "your-wifi-name";
 const char WIFI_PASSWORD[] = "your-wifi-password";
 
+// Offset from UTC in seconds. Examples: Finland winter 7200, Finland summer 10800.
+#define TIME_UTC_OFFSET_SECONDS 0
+
 #endif