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
port of the MQTT broker.
+A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
=item B<CertificateFile> I<file>
Path to the PEM-encoded certificate file to use as client certificate when
-connecting to the MQTT broker. Requires B<CertificateFile>
+connecting to the MQTT broker.
+A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
=item B<CertificateKeyFile> I<file>
-Path to the unencrypted PEM-encoded key file corresponding to B<CertificateFile>.
+Path to the unencrypted PEM-encoded key file corresponding to B<CertificateFile>.
+A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
-=item B<TLSprotocol> I<protocol>
+=item B<TLSProtocol> I<protocol>
-If configured, this specifies the string protocol version (e.g. tlsv1, tlsv1.2) to
-use for the TLS connection to the broker. If not set a default version is used which
-depends on the version of OpenSSL the Mosquitto library was linked against.
+If configured, this specifies the string protocol version (e.g. C<tlsv1>,
+C<tlsv1.2>) to use for the TLS connection to the broker. If not set a default
+version is used which depends on the version of OpenSSL the Mosquitto library
+was linked against.
=item B<CipherSuite> I<ciphersuite>
-A string describing the ciphers available for use. See the "openssl ciphers" utility
-for more information. If unset, the default ciphers will be used.
+A string describing the ciphers available for use. See L<ciphers(1)> and the
+C<openssl ciphers> utility for more information. If unset, the default ciphers
+will be used.
=back
=back
+=head2 Plugin C<notify_nagios>
+
+The I<notify_nagios> plugin writes notifications to Nagios' I<command file> as
+a I<passive service check result>.
+
+Available configuration options:
+
+=over 4
+
+=item B<CommandFile> I<Path>
+
+Sets the I<command file> to write to. Defaults to F</usr/local/nagios/var/rw/nagios.cmd>.
+
+=back
+
=head2 Plugin C<ntpd>
=over 4