Add sync method

Author: pennam

src/utility/time/TimeService.cpp

@@ -170,6 +170,20 @@ unsigned long TimeService::getTime()
 #endif
 }
 
+bool TimeService::sync()
+{
+  _is_rtc_configured = false;
+  unsigned long utc = getRemoteTime();
+
+  if(isTimeValid(utc)) {
+    DEBUG_DEBUG("TimeServiceClass::%s  Drift: %d RTC value: %u", __FUNCTION__, getRTC() - utc, utc);
+    setRTC(utc);
+    _last_ntp_sync_tick = millis();
+    _is_rtc_configured = true;
+  }
+  return _is_rtc_configured;
+}
+
 void TimeService::setTimeZoneData(long offset, unsigned long dst_until)
 {
   if(_timezone_offset != offset)

src/utility/time/TimeService.h

@@ -43,11 +43,11 @@ class TimeService
 
   TimeService();
 
-
   void          begin  (ConnectionHandler * con_hdl);
   unsigned long getTime();
   unsigned long getLocalTime();
   void          setTimeZoneData(long offset, unsigned long valid_until);
+  bool          sync();
   /* Helper function to convert an input String into a UNIX timestamp.
    * The input String format must be as follow "2021 Nov 01 17:00:00"
    */