Revision 19469: https://forum.fhem.de/index.php/topic,78101.msg943114.html#msg943114
​https://forum.fhem.de/index.php/topic,78101.msg943114.html#msg943114
Source: Revision 19469: https://forum.fhem.de/index.php/topic,78101.msg943114.html#msg943114 (http://svn.fhem.de/trac/changeset/19469/trunk)