<varlistentry>
	<term><option>--psk</option></term>
	<listitem>
		<para>
            Provide the hexadecimal (no leading 0x) pre-shared-key matching the
            one used on the broker to use TLS-PSK encryption support.
            <option>--psk-identity</option> must also be provided to enable TLS-PSK.
		</para>
	</listitem>
</varlistentry>
