Revision 20816: 10_MQTT2_DEVICE.pm: avoid warning if there is no clientId (Forum #90145)
10_MQTT2_DEVICE.pm: avoid warning if there is no clientId (Forum: #90145)
Source: Revision 20816: 10_MQTT2_DEVICE.pm: avoid warning if there is no clientId (Forum #90145) (http://svn.fhem.de/trac/changeset/20816/trunk)