Differentiation connected and connetion_established implemented

__init__.py

         self.__comm_inst__.register_connect_callback(self.__connection_established__)
         self.__comm_inst__.register_disconnect_callback(self.__authentification_state_reset__)
 
-    def is_connected(self):
+    def connected(self):
         return self.__comm_inst__.is_connected()
 
+    def connection_established(self):
+        return self.connected() and (self.__secret__ is None or self.check_authentification_state())
+
     def reconnect(self):
         return self.__comm_inst__.reconnect()