resp, err := conn.sendDataAndWaitForAck(update.Update, update.Fd)
			if err != nil {
				log.Errorf("ztunnel acked error: err %v ackErr %s", err, resp.GetAck().GetError())
			}
			log.Debugf("ztunnel acked")
			// Safety: Resp is buffered, so this will not block
			update.Resp <- updateResponse{
				err:  err,
				resp: resp,
			}

		case <-time.After(ztunnelKeepAliveCheckInterval):