// Copyright 2025 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.hardware.google.nanohub;

/// Events related to the lifecycle of the MCU.
type LifecycleEvent = flexible enum {
    /// Indicates the MCU is not currently configured.
    UNCONFIGURED = 0;
    /// Indicates the MCU is starting up.
    START = 1;
    /// Indicates the MCU is ready to accept commands and data.
    READY = 2;
    /// Indicates the MCU is shutting down.
    SHUTDOWN = 3;
};

/// Observer interface for lifecycle events.
closed protocol LifecycleObserver {
    /// Called when the lifecycle state changes.
    strict -> OnLifecycleChange(struct {
        event LifecycleEvent;
    });
};