Fix for NTP update time. Minor refactoring.

src/wordclock_esp8266.cpp

@@ -251,9 +251,6 @@ void loop()
     if ((current_time_us - last_heartbeat_us) >= PERIOD_HEARTBEAT_US)
     {
         send_heartbeat(); // send heartbeat update
-
-        tm_mgr.log_time(); // TODO rm
-
         last_heartbeat_us = system_get_time();
         delay(10);
     }
@@ -283,7 +280,10 @@ void loop()
 
     if ((current_time_us - last_time_update_us) >= PERIOD_TIME_UPDATE_US)
     {
-        tm_mgr.ntp_time_update(); // NTP time update
+        if (tm_mgr.ntp_time_update() == NTP_UPDATE_OK) // NTP time update
+        {
+            logger.log_string("NTP sync successful!");
+        }
 
         if (tm_mgr.ntp_update_failed_prolonged() == true)
         {