From 54fd8c21df6986a6eca4b17f86e998fe3365e387 Mon Sep 17 00:00:00 2001
From: rudolfkoenig <>
Date: Sat, 22 Oct 2016 10:10:29 +0000
Subject: [PATCH] DevIo.pm: Better error message for NonBlocking by Markus
 (Forum #59419)

git-svn-id: https://svn.fhem.de/fhem/trunk@12397 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/DevIo.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fhem/FHEM/DevIo.pm b/fhem/FHEM/DevIo.pm
index c7948660b..22ba0a4f5 100644
--- a/fhem/FHEM/DevIo.pm
+++ b/fhem/FHEM/DevIo.pm
@@ -204,6 +204,7 @@ DevIo_OpenDev($$$;$)
 
   my $doCb = sub ($) {
     my ($r) = @_;
+    Log3 $name, 3, "Can't connect to $dev: $r" if(!$reopen && $r);
     $callback->($hash,$r) if($callback);
     return $r;
   };
@@ -315,7 +316,7 @@ DevIo_OpenDev($$$;$)
         $conn->setsockopt(SOL_SOCKET, SO_KEEPALIVE, 1) if(defined($conn));
 
       } else {
-        Log3 $name, 3, "Can't connect to $dev: $!" if(!$reopen);
+        Log3 $name, 3, "Can't connect to $dev: $!" if(!$reopen && $!);
         $readyfnlist{"$name.$dev"} = $hash;
         DevIo_setStates($hash, "disconnected");
         $hash->{NEXT_OPEN} = time() + $nextOpenDelay;