Send (every 240s) a PING command to all connected irc servers

fix #2452

src/bridge/bridge.cpp

@@ -63,6 +63,11 @@ void Bridge::clean()
   }
 }
 
+const std::string& Bridge::get_jid() const
+{
+  return this->user_jid;
+}
+
 Xmpp::body Bridge::make_xmpp_body(const std::string& str)
 {
   std::string res;

src/bridge/bridge.hpp

@@ -32,6 +32,10 @@ public:
    * Remove all inactive IrcClients
    */
   void clean();
+  /**
+   * Return the jid of the XMPP user using this bridge
+   */
+  const std::string& get_jid() const;
 
   static Xmpp::body make_xmpp_body(const std::string& str);
   /***