[sr-dev] [kamailio/kamailio] mqtt: Add tls_alpn module option (PR #3261)

[Andreas Granig]

@agranig commented on this pull request.



> @@ -324,6 +324,27 @@ modparam("mqtt", "ca_path", "/etc/ssl/certs")
 		<programlisting format="linespecific">
 ...
 modparam("mqtt", "tls_method", "tlsv1.3")
+...
+		</programlisting>
+		</example>
+	</section>
+	<section id="mqtt.p.tls_alpn">
+		<title><varname>tls_alpn</varname> (str)</title>
+		<para>
+        Used to set the TLS ALPN option for cases where one TLS port is used to share multiple services. Prominent
+        example is AWS IoT, where you have to set the <varname>tls_alpn</varname> to "mqtt" to be able to connect
+        via MQTT.
+		</para>
+		<para>
+		<emphasis>
+			Default value is NULL, where no ALPN is set on the TLS connection.

It's a bit of a rabbit hole. https://www.kamailio.org/docs/modules/devel/modules/dispatcher.html#dispatcher.p.db_url is one of the most famous ones I guess. Any good example how to properly document a non-set behavior, so it's consistent?

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