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);
-  while (!DateTime.isTimeValid())
-  {
+  DateTime.begin();
+  /* 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;
   }
-  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,
@@ -248,24 +264,27 @@ void loop()
               }
               client.println("</h2>\n");
 
-              DateTimeParts p = DateTime.getParts();
-              char dt[21];
-
-              if (is_wintertime(DateTime.getTime()) == false)
-                add_summertime = 1;
-              else
-                add_summertime = 0;
-
-              client.println("<hr>\n");
-              client.print("<h4 style=\"color:black;\">");
-
-              sprintf(dt, "%02d.%02d.%4d  %02d:%02d:%02d", p.getMonthDay(), p.getMonth() + 1, p.getYear(), p.getHours() + add_summertime, p.getMinutes(), p.getSeconds());
-              client.print(dt);
-              if (add_summertime > 0)
-                client.print(" Sommerzeit\n");
-              else
-                client.print(" Winterzeit\n");
-              client.println("</h2>\n");
+              if (DateTime.isTimeValid())
+              {
+                DateTimeParts p = DateTime.getParts();
+                char dt[21];
+
+                if (is_wintertime(DateTime.getTime()) == false)
+                  add_summertime = 1;
+                else
+                  add_summertime = 0;
+
+                client.println("<hr>\n");
+                client.print("<h4 style=\"color:black;\">");
+
+                sprintf(dt, "%02d.%02d.%4d  %02d:%02d:%02d", p.getMonthDay(), p.getMonth() + 1, p.getYear(), p.getHours() + add_summertime, p.getMinutes(), p.getSeconds());
+                client.print(dt);
+                if (add_summertime > 0)
+                  client.print(" Sommerzeit\n");
+                else
+                  client.print(" Winterzeit\n");
+                client.println("</h2>\n");
+              }
 
               client.println("</center>\n");
               client.println("</body>\n");
@@ -327,27 +346,32 @@ void check_reset_ap_data(void)
 
 void show_time(void)
 {
-  DateTimeParts p = DateTime.getParts();
   char dt[21];
 
-  if (p.getHours() == 0 && p.getMinutes() == 0 && p.getSeconds() == 0)
-    DateTime.forceUpdate();
-
-  if ((p.getHours() == 2 || p.getHours() == 3) && p.getMinutes() == 0 && p.getSeconds() == 0)
+  if (DateTime.isTimeValid())
   {
-    if (is_wintertime(DateTime.getTime()) == false)
-      add_summertime = 1;
+    DateTimeParts p = DateTime.getParts();
+
+    if (p.getHours() == 0 && p.getMinutes() == 0 && p.getSeconds() == 0)
+      DateTime.forceUpdate();
+
+    if ((p.getHours() == 2 || p.getHours() == 3) && p.getMinutes() == 0 && p.getSeconds() == 0)
+    {
+      if (is_wintertime(DateTime.getTime()) == false)
+        add_summertime = 1;
+      else
+        add_summertime = 0;
+    }
+
+    sprintf(dt, "%02d.%02d.%4d  %02d:%02d:%02d", p.getMonthDay(), p.getMonth() + 1, p.getYear(), p.getHours() + add_summertime, p.getMinutes(), p.getSeconds());
+    DEBUG_MSG("%s", dt);
+    if (add_summertime > 0)
+      DEBUG_MSG(" Summertime\n");
     else
-      add_summertime = 0;
+      DEBUG_MSG(" Wintertime\n");
   }
-
-  sprintf(dt, "%02d.%02d.%4d  %02d:%02d:%02d", p.getMonthDay(), p.getMonth() + 1, p.getYear(), p.getHours() + add_summertime, p.getMinutes(), p.getSeconds());
-  DEBUG_MSG("%s", dt);
-  if (add_summertime > 0)
-    DEBUG_MSG(" Summertime\n");
   else
-    DEBUG_MSG(" Wintertime\n");
-
+    sprintf(dt, "--:--:----  --:--:--");
 
   lcd.setCursor(0, 0);
   lcd.print(dt);