Increase the initial check interval for NTP (#452)

code/espurna/config/general.h

@@ -775,6 +775,7 @@ PROGMEM const char* const custom_reset_string[] = {
 #define NTP_SERVER              "pool.ntp.org"  // Default NTP server
 #define NTP_TIME_OFFSET         1               // Default timezone offset (GMT+1)
 #define NTP_DAY_LIGHT           true            // Enable daylight time saving by default
+#define NTP_SYNC_INTERVAL       60              // NTP initial check every minute
 #define NTP_UPDATE_INTERVAL     1800            // NTP check every 30 minutes
 #define NTP_START_DELAY         1000            // Delay NTP start 1 second
 

code/espurna/ntp.ino

@@ -35,7 +35,7 @@ void _ntpStart() {
     _ntp_start = 0;
 
     NTP.begin(getSetting("ntpServer", NTP_SERVER));
-    NTP.setInterval(NTP_UPDATE_INTERVAL);
+    NTP.setInterval(NTP_SYNC_INTERVAL, NTP_UPDATE_INTERVAL);
     _ntpConfigure();
 
 }