code: def get_external_commands(self):
          
          res = self.con.get('_external_commands', wait=False)
          logger.debug("Got %d external commands from %s: %s", len(res), self.name, res)
          return unserialize(res, True)
docs: Send a HTTP request to the satellite (GET /_external_commands) to
          get the external commands from the satellite.
  
          :return: External Command list on success, [] on failure
          :rtype: list