Path to the unencrypted PEM-encoded key file corresponding to B<CertificateFile>.
-=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