code: def enable(self, interface_id, dns_relay_profile=None):
          
          if not dns_relay_profile:  # Use default
              href = DNSRelayProfile('Cache Only').href
          else:
              href = element_resolver(dns_relay_profile)
  
          intf = self.engine.interface.get(interface_id)
          
          self.engine.data.update(dns_relay_profile_ref=href)
          self.engine.data.update(dns_relay_interface=intf.ndi_interfaces)
docs: Enable the DNS Relay service on this engine.
  
          :param int interface_id: interface id to enable relay
          :param str,DNSRelayProfile dns_relay_profile: DNSRelayProfile element
              or str href
          :raises EngineCommandFailed: interface not found
          :raises ElementNotFound: profile not found
          :return: None