code: def add_prefix(self, prefix, flags, prf):
          
          self._req('prefix add %s %s %s' % (prefix, flags, prf))
          time.sleep(1)
          self._req('netdataregister')
docs: Add network prefix.
  
          Args:
              prefix (str): network prefix.
              flags (str): network prefix flags, please refer thread documentation for details
              prf (str): network prf, please refer thread documentation for details