Make the XMPP component port configurable

fix #2541

doc/biboumi.1.md

@@ -46,6 +46,11 @@ The configuration file uses a simple format of the form
   This password must be configured in the XMPP server, associated with the
   external component on *hostname*.
 
+`port`
+
+  The TCP port to use to connect to the local XMPP component. The default
+  value is 5347.
+
 `admin`
 
   The bare JID of the gateway administrator. This JID will have more

src/xmpp/xmpp_component.cpp

@@ -2,8 +2,8 @@
 #include <logger/logger.hpp>
 
 #include <xmpp/xmpp_component.hpp>
+#include <config/config.hpp>
 #include <xmpp/jid.hpp>
-
 #include <utils/sha1.hpp>
 
 #include <stdexcept>
@@ -68,7 +68,7 @@ XmppComponent::~XmppComponent()
 
 void XmppComponent::start()
 {
-  this->connect("127.0.0.1", "5347", false);
+  this->connect("127.0.0.1", Config::get("port", "5347"), false);
 }
 
 bool XmppComponent::is_document_open() const