diff --git a/fhem/CHANGED b/fhem/CHANGED
index f8b56286f..1c0f694c1 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,6 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it.
+  - fix: 66_ECMD: use STATE not state for connection checking (forum #31307)
   - feature: 57_Calendar: enable gzipped ical files (forum #31845)
   - bugfix: 70_Jabber.pm: XMPP DNS SVR record query added
   - bugfix: 70_PIONEERAVR: fixed "missed to call readingsBeginUpdate first" 
diff --git a/fhem/FHEM/66_ECMD.pm b/fhem/FHEM/66_ECMD.pm
index 4cf1ecfd5..488eafd28 100644
--- a/fhem/FHEM/66_ECMD.pm
+++ b/fhem/FHEM/66_ECMD.pm
@@ -532,7 +532,7 @@ sub ECMD_Read($)
 {
   my ($hash) = @_;
   
-  return undef unless($hash->{state} eq "opened"); # avoid reading from closed device
+  return undef unless($hash->{STATE} eq "opened"); # avoid reading from closed device
   
   my $buf = ECMD_SimpleRead($hash);
   return unless(defined($buf));