Calendar:

- Undefined return values and empty strings from GetFileFromURLQuiet() are error conditions.
- Do not retry download of ical file immediately; wait until the next scheduled time instead.
- STATE is "No data" on error.

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@4695 2b470e98-0d58-463d-a4d8-8e2adae1ed80

fhem/FHEM/57_Calendar.pm

@@ -816,6 +816,12 @@ sub Calendar_GetUpdate($) {
   $hash->{fhem}{lstUpdtTs}= $t;
   $hash->{fhem}{lastUpdate}= FmtDateTime($t);
   
+  $t+= $hash->{fhem}{interval};
+  $hash->{fhem}{nxtUpdtTs}= $t;
+  $hash->{fhem}{nextUpdate}= FmtDateTime($t);
+
+  $hash->{STATE}= "No data";
+  
   Log3 $hash, 4, "Calendar " . $hash->{NAME} . ": Updating...";
   my $type = $hash->{fhem}{type};
   my $url= $hash->{fhem}{url};
@@ -840,7 +846,7 @@ sub Calendar_GetUpdate($) {
   }
     
   
-  if(!defined($ics)) {
+  if(!defined($ics) or ("$ics" eq "")) {
     Log3 $hash, 1, "Calendar " . $hash->{NAME} . ": Could not retrieve file at URL";
     return 0;
   }
@@ -897,10 +903,6 @@ sub Calendar_GetUpdate($) {
   readingsBulkUpdate($hash, "stateChanged", join(";", @changed));
   readingsEndUpdate($hash, 1); # DoTrigger, because sub is called by a timer instead of dispatch
 
-  $t+= $hash->{fhem}{interval};
-  $hash->{fhem}{nxtUpdtTs}= $t;
-  $hash->{fhem}{nextUpdate}= FmtDateTime($t);
-
   return 1;
 }