MAX_HW_ERROR
wdd->min_hw_heartbeat_ms = 520 * wdd->timeout + MAX_HW_ERROR;
wdd->min_hw_heartbeat_ms = 520 * heartbeat + MAX_HW_ERROR;
wdd->min_hw_heartbeat_ms = 770 * heartbeat + MAX_HW_ERROR;
wdd->min_hw_heartbeat_ms = 895 * heartbeat + MAX_HW_ERROR;
wdd->min_hw_heartbeat_ms = 955 * heartbeat + MAX_HW_ERROR;
wdd->min_hw_heartbeat_ms = 989 * heartbeat + MAX_HW_ERROR;