multi level C<#> wildcards. Defaults to B<collectd/#>, i.e. all topics beneath
the B<collectd> branch.
-=item B<CACertificateFile> I<file>
+=item B<CACert> I<file>
Path to the PEM-encoded CA certificate file. Setting this option enables TLS
communication with the MQTT broker, and as such, B<Port> should be the TLS-enabled