method is_connected added

__init__.py

         self.__comm_inst__.register_connect_callback(self.__clean_receive_buffer__)
         self.__comm_inst__.register_disconnect_callback(self.__authentification_state_reset__)
 
+    def is_connected(self):
+        return self.__comm_inst__.is_connected()
+
     def __authentification_state_reset__(self):
         logger.info("%s Resetting authentification state to AUTH_STATE_UNKNOWN_CLIENT", self.LOG_PREFIX)
         self.__authentification_state__ = self.AUTH_STATE_UNKNOWN_CLIENT