Note in the man pages that SIGHUP reloads TLS certificates.

Closes #2037. Thanks to Greg Troxel.

ChangeLog.txt

@@ -14,6 +14,7 @@ Broker:
   a message with empty topic and topic alias set, but the topic alias hadn't
   already been configured on the broker. This has been fixed to send a
   protocol error, as per section 3.3.4 of the specification.
+- Note in the man pages that SIGHUP reloads TLS certificates. Closes #2037.
 
 Apps:
 - Allow command line arguments to override config file options in

man/mosquitto.8.xml

@@ -431,6 +431,8 @@
 					be reloaded without restarting. See
 					<citerefentry><refentrytitle>mosquitto.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 					for details.</para>
+					<para>If TLS certificates are in use, then mosquitto will
+					also reload certificate on receiving a SIGHUP.</para>
 				</listitem>
 			</varlistentry>
 			<varlistentry>

man/mosquitto.conf.5.xml

@@ -1275,6 +1275,12 @@ log_timestamp_format %Y-%m-%dT%H:%M:%S
 							option and <option>keyfile</option> must be present
 							to enable certificate based TLS encryption.
 						</para>
+						<para>
+							The certificate pointed to by this option will be
+							reloaded when Mosquitto receives a SIGHUP signal.
+							This can be used to load new certificates prior to
+							the existing ones expiring.
+						</para>
 					</listitem>
 				</varlistentry>
 				<varlistentry>
@@ -1328,6 +1334,12 @@ openssl dhparam -out dhparam.pem 2048</programlisting>
 							option and <option>certfile</option> must be present
 							to enable certificate based TLS encryption.
 						</para>
+						<para>
+							The private key pointed to by this option will be
+							reloaded when Mosquitto receives a SIGHUP signal.
+							This can be used to load new keys prior to
+							the existing ones expiring.
+						</para>
 					</listitem>
 				</varlistentry>
 				<varlistentry>