diff --git a/fhem/FHEM/00_MYSENSORS.pm b/fhem/FHEM/00_MYSENSORS.pm
index 60e95032a..21fe7897b 100644
--- a/fhem/FHEM/00_MYSENSORS.pm
+++ b/fhem/FHEM/00_MYSENSORS.pm
@@ -214,6 +214,7 @@ sub Init($) {
     });
   }
   readingsSingleUpdate($hash,"connection","connected",1);
+  sendMessage($hash, radioId => 0, childId => 0, cmd => C_INTERNAL, ack => 0, subType => I_VERSION, payload => '');
   return undef;
 }
 
@@ -349,6 +350,10 @@ sub onInternalMsg($$) {
         });
         last;
       };
+      $type == I_VERSION and do {
+        $hash->{version} = $msg->{payload};
+        last;
+      };
       $type == I_LOG_MESSAGE and do {
         Log3($hash->{NAME},5,"MYSENSORS gateway $hash->{NAME}: $msg->{payload}");
         last;
@@ -405,7 +410,7 @@ sub onAcknowledge($$) {
 
 sub sendMessage($%) {
   my ($hash,%msg) = @_;
-  $msg{ack} = $hash->{ack} unless $msg{ack};
+  $msg{ack} = $hash->{ack} unless defined $msg{ack};
   my $txt = createMsg(%msg);
   Log3 ($hash->{NAME},5,"MYSENSORS send: ".dumpMsg(\%msg));
   DevIo_SimpleWrite($hash,"$txt\n",undef);
diff --git a/fhem/FHEM/10_MYSENSORS_DEVICE.pm b/fhem/FHEM/10_MYSENSORS_DEVICE.pm
index 73c9c6856..0ac23468e 100644
--- a/fhem/FHEM/10_MYSENSORS_DEVICE.pm
+++ b/fhem/FHEM/10_MYSENSORS_DEVICE.pm
@@ -515,7 +515,7 @@ sub onInternalMessage($$) {
 sub sendClientMessage($%) {
   my ($hash,%msg) = @_;
   $msg{radioId} = $hash->{radioId};
-  $msg{ack} = 1 if $hash->{ack};
+  $msg{ack} = $hash->{ack} unless defined $msg{ack};
   sendMessage($hash->{IODev},%msg);
 }
 
@@ -527,7 +527,7 @@ sub rawToMappedReading($$$$) {
     if(defined (my $val = $mapping->{val} // $hash->{typeMappings}->{$type}->{val})) {
       return ($mapping->{name},$val->{$value} // $value);
     }
-    die "not type-mapping for type ".variableTypeToStr($type);
+    die "no type-mapping for type ".variableTypeToStr($type);
   }
   die "no reading-mapping for childId $childId, type ".($hash->{typeMappings}->{$type}->{type} ? $hash->{typeMappings}->{$type}->{type} : variableTypeToStr($type));
 }