diff --git a/fhem/FHEM/00_FBAHA.pm b/fhem/FHEM/00_FBAHA.pm
index 6aa5fb75c..779c733ed 100755
--- a/fhem/FHEM/00_FBAHA.pm
+++ b/fhem/FHEM/00_FBAHA.pm
@@ -328,15 +328,20 @@ FBAHA_Ready($)
   <a name="FBAHAdefine"></a>
   <b>Define</b>
   <ul>
-    <code>define &lt;name&gt; FBAHA &lt;host&gt;:&lt;port&gt;</code>
+    <code>define &lt;name&gt; FBAHA &lt;device&gt;</code>
   <br>
   <br>
+  &lt;device&gt; is either a &lt;host&gt;:&lt;port&gt; combination, where
   &lt;host&gt; is normally the address of the FRITZ!Box running the AHA server
-  (fritz.box or localhost), and :&lt;port&gt; is 2002.
+  (fritz.box or localhost), and &lt;port&gt; 2002, or
+  UNIX:SEQPACKET:/var/tmp/me_avm_home_external.ctl, the latter only works on
+  the fritz.box. With FRITZ!OS 5.50 the network port is available, on some
+  Labor variants only the UNIX socket is available.
   <br>
   Example:
   <ul>
     <code>define fb1 FBAHA fritz.box:2002</code><br>
+    <code>define fb1 FBAHA UNIX:SEQPACKET:/var/tmp/me_avm_home_external.ctl</code><br>
   </ul>
   </ul>
   <br>
@@ -395,15 +400,23 @@ FBAHA_Ready($)
   <a name="FBAHAdefine"></a>
   <b>Define</b>
   <ul>
-    <code>define &lt;name&gt; FBAHA &lt;host&gt;:&lt;port&gt;</code>
+    <code>define &lt;name&gt; FBAHA &lt;device&gt;</code>
   <br>
   <br>
   &lt;host&gt; ist normalerweise die Adresse der FRITZ!Box, wo das AHA Server
   l&auml;uft (fritz.box oder localhost), &lt;port&gt; ist 2002.
+
+  &lt;device&gt; is entweder a eine Kombianation aus &lt;host&gt;:&lt;port&gt;,
+  wobei &lt;host&gt; die Adresse der FRITZ!Box ist (localhost AUF dem
+  FRITZ.BOX) und &lt;port&gt; 2002 ist, oder
+  UNIX:SEQPACKET:/var/tmp/me_avm_home_external.ctl, wobei das nur fuer
+  FHEM@FRITZ!BOX zur Verfügung steht. Mit FRITZ!OS 5.50 steht auch der
+  Netzwerkport zur Verfügung, auf manchen Laborvarianten nur das UNIX socket.
   <br>
   Beispiel:
   <ul>
     <code>define fb1 FBAHA fritz.box:2002</code><br>
+    <code>define fb1 FBAHA UNIX:SEQPACKET:/var/tmp/me_avm_home_external.ctl</code><br>
   </ul>
   </ul>
   <br>
diff --git a/fhem/FHEM/DevIo.pm b/fhem/FHEM/DevIo.pm
index 95f756b51..7874e406e 100644
--- a/fhem/FHEM/DevIo.pm
+++ b/fhem/FHEM/DevIo.pm
@@ -108,7 +108,31 @@ DevIo_OpenDev($$$)
   Log 3, "Opening $name device $dev"
         if(!$reopen);
 
-  if($dev =~ m/^(.+):([0-9]+)$/) {       # host:port
+  if($dev =~ m/^UNIX:(SEQPACKET|STREAM):(.*)$/) { # FBAHA
+    my ($type, $fname) = ($1, $2);
+    my $conn;
+    eval {
+      require IO::Socket::UNIX;
+      $conn = IO::Socket::UNIX->new(
+        Type=>($type eq "STREAM" ? SOCK_STREAM:SOCK_SEQPACKET), Peer=>$fname);
+    };
+    if($@) {
+      Log 1, $@;
+      return $@;
+    }
+
+    if(!$conn) {
+      Log(3, "Can't connect to $dev: $!") if(!$reopen);
+      $readyfnlist{"$name.$dev"} = $hash;
+      $hash->{STATE} = "disconnected";
+      return "";
+    }
+    $hash->{TCPDev} = $conn;
+    $hash->{FD} = $conn->fileno();
+    delete($readyfnlist{"$name.$dev"});
+    $selectlist{"$name.$dev"} = $hash;
+
+  } elsif($dev =~ m/^(.+):([0-9]+)$/) {       # host:port
 
     # This part is called every time the timeout (5sec) is expired _OR_
     # somebody is communicating over another TCP connection. As the connect