HIO_KEEPALIVE
nv_add_uint8(nv, HIO_KEEPALIVE, "cmd");
case HIO_KEEPALIVE:
if (hio->hio_cmd != HIO_KEEPALIVE) {
case HIO_KEEPALIVE:
case HIO_KEEPALIVE:
if (hio->hio_cmd == HIO_KEEPALIVE) {