More checking if time values are ok.

WLAN_Thermometer.ino

@@ -118,16 +118,19 @@ void setup()
   lcd.setCursor(0, 3);
   lcd.print("Getting time...");
   DateTime.setTimeZone(1);
-  DateTime.begin(NTP_TIMEOUT);
+  DateTime.begin();
-  while (!DateTime.isTimeValid())
+  /* while (!DateTime.isTimeValid())
     {
     DEBUG_MSG("Failed to get time from server.\n");
     DateTime.forceUpdate();
-  }
+    }*/
+  if (DateTime.isTimeValid())
+  {
     if (is_wintertime(DateTime.getTime()) == false)
       add_summertime = 1;
     else
       add_summertime = 0;
+  }
 
   // create a degree sign
   lcd.createChar(0, (uint8_t*)degree_sign);
@@ -155,8 +158,21 @@ void setup()
 
 void loop()
 {
+  static uint32_t next_time_check;
+
   sched.scheduler();
 
+  if (!DateTime.isTimeValid() && millis() - 10000 > next_time_check)
+  {
+    next_time_check = millis();
+    DateTime.setTimeZone(1);
+    DateTime.forceUpdate();
+    if (is_wintertime(DateTime.getTime()) == false)
+      add_summertime = 1;
+    else
+      add_summertime = 0;
+  }
+
   WiFiClient client = server.available(); // Listen for incoming clients
 
   if (client) { // If a new client connects,
@@ -248,6 +264,8 @@ void loop()
               }
               client.println("</h2>\n");
 
+              if (DateTime.isTimeValid())
+              {
                 DateTimeParts p = DateTime.getParts();
                 char dt[21];
 
@@ -266,6 +284,7 @@ void loop()
                 else
                   client.print(" Winterzeit\n");
                 client.println("</h2>\n");
+              }
 
               client.println("</center>\n");
               client.println("</body>\n");
@@ -327,9 +346,12 @@ void check_reset_ap_data(void)
 
 void show_time(void)
 {
-  DateTimeParts p = DateTime.getParts();
   char dt[21];
 
+  if (DateTime.isTimeValid())
+  {
+    DateTimeParts p = DateTime.getParts();
+
     if (p.getHours() == 0 && p.getMinutes() == 0 && p.getSeconds() == 0)
       DateTime.forceUpdate();
 
@@ -347,7 +369,9 @@ void show_time(void)
       DEBUG_MSG(" Summertime\n");
     else
       DEBUG_MSG(" Wintertime\n");
-
+  }
+  else
+    sprintf(dt, "--:--:----  --:--:--");
 
   lcd.setCursor(0, 0);
   lcd.print(dt);