From bbe8f9096a6b5d1a95c3a5e0bc88e3eefb61457d Mon Sep 17 00:00:00 2001
From: Atsushi Morimoto <74th.tech@gmail.com>
Date: Sun, 19 Apr 2026 16:59:27 +0900
Subject: [PATCH 1/4] =?UTF-8?q?feat:=20=E6=96=B0=E3=81=97=E3=81=84?=
 =?UTF-8?q?=E3=82=A6=E3=82=A7=E3=82=A4=E3=82=AF=E3=82=A2=E3=83=83=E3=83=97?=
 =?UTF-8?q?=E3=83=AF=E3=83=BC=E3=83=89=E9=8C=B2=E9=9F=B3=E6=A9=9F=E8=83=BD?=
 =?UTF-8?q?=E3=82=B5=E3=83=B3=E3=83=97=E3=83=AB?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 example_apps/record_wakeup_word.py | 49 ++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 example_apps/record_wakeup_word.py

diff --git a/example_apps/record_wakeup_word.py b/example_apps/record_wakeup_word.py
new file mode 100644
index 0000000..67b27ea
--- /dev/null
+++ b/example_apps/record_wakeup_word.py
@@ -0,0 +1,49 @@
+from __future__ import annotations
+
+import logging
+import os
+from logging import getLogger
+from this import d
+
+from dotenv import load_dotenv
+
+from stackchan_server.app import StackChanApp
+from stackchan_server.ws_proxy import EmptyTranscriptError, WsProxy
+
+logger = getLogger(__name__)
+logging.basicConfig(
+    level=os.getenv("STACKCHAN_LOG_LEVEL", "INFO"),
+    format="%(asctime)s.%(msecs)03d %(levelname)s:%(name)s:%(message)s",
+    datefmt="%H:%M:%S",
+)
+
+load_dotenv()
+
+
+app = StackChanApp()
+
+
+@app.setup
+async def setup(proxy: WsProxy):
+    logger.info("WebSocket connected")
+
+
+@app.talk_session
+async def talk_session(proxy: WsProxy):
+    while True:
+        try:
+            text = await proxy.listen()
+        except EmptyTranscriptError:
+            return
+        if not text:
+            return
+        logger.info("Heard: %s", text)
+        await proxy.speak(text)
+
+@app.webapi("/record_wakeup_word")
+async def record_wakeup_word(proxy: WsProxy, args: dict):
+    logger.info("Recording wakeup word...")
+    await proxy.speak("これからウェイクアップワードの録音を開始します。ピッと鳴ったら、ウェイクアップワードを話してください。")
+    await proxy.tone(4000, 200)
+    raw_audio = await proxy.listen_raw(duration=3000)  # 3秒間録音
+    await proxy.tone(1000, 200)

From 1c007068af629b58c73426d181d9937ae2d1017c Mon Sep 17 00:00:00 2001
From: Atsushi Morimoto <74th.tech@gmail.com>
Date: Sun, 19 Apr 2026 17:22:46 +0900
Subject: [PATCH 2/4] feat: add tone command functionality and fixed duration
 recording

- Implemented tone command handling in the firmware, allowing the device to play tones with specified frequency and duration.
- Added support for fixed duration recording in the Listening class, enabling recording to stop after a specified time or after a period of silence.
- Updated protobuf definitions to include ToneCommand and ToneDoneEvent messages.
- Enhanced the WebSocket server to handle tone commands and notify when tones are completed.
- Refactored the ListenHandler to support raw audio listening and improved result handling.
---
 .gitignore                                    |   1 +
 example_apps/record_wakeup_word.py            |  38 ++++++-
 firmware/include/listening.hpp                |   6 ++
 .../generated_protobuf/websocket-message.pb.c |   6 ++
 .../generated_protobuf/websocket-message.pb.h |  64 +++++++++--
 firmware/src/listening.cpp                    |  32 +++++-
 firmware/src/main.cpp                         |  79 ++++++++++++++
 protobuf/websocket-message.proto              |  14 +++
 stackchan_server/app.py                       |  38 ++++++-
 .../websocket_message_pb2.py                  |  88 +++++++--------
 stackchan_server/listen.py                    | 102 +++++++++++++++---
 stackchan_server/protobuf_ws.py               |  36 ++++++-
 stackchan_server/ws_proxy.py                  |  84 ++++++++++++++-
 13 files changed, 513 insertions(+), 75 deletions(-)

diff --git a/.gitignore b/.gitignore
index 768ebf5..1e89031 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 .vscode/launch.json
 .vscode/ipch
 .log
+tmp/
 firmware/include/config.h
 recordings
 ._.DS_Store
diff --git a/example_apps/record_wakeup_word.py b/example_apps/record_wakeup_word.py
index 67b27ea..b23bb5b 100644
--- a/example_apps/record_wakeup_word.py
+++ b/example_apps/record_wakeup_word.py
@@ -1,13 +1,17 @@
 from __future__ import annotations
 
+import asyncio
 import logging
 import os
+import wave
+from datetime import UTC, datetime
 from logging import getLogger
-from this import d
+from pathlib import Path
 
 from dotenv import load_dotenv
 
 from stackchan_server.app import StackChanApp
+from stackchan_server.static import LISTEN_AUDIO_FORMAT
 from stackchan_server.ws_proxy import EmptyTranscriptError, WsProxy
 
 logger = getLogger(__name__)
@@ -40,10 +44,36 @@ async def talk_session(proxy: WsProxy):
         logger.info("Heard: %s", text)
         await proxy.speak(text)
 
+
 @app.webapi("/record_wakeup_word")
 async def record_wakeup_word(proxy: WsProxy, args: dict):
-    logger.info("Recording wakeup word...")
-    await proxy.speak("これからウェイクアップワードの録音を開始します。ピッと鳴ったら、ウェイクアップワードを話してください。")
+    duration_ms = int(args.get("duration_ms", args.get("duration", 3000)))
+    logger.info("Recording wakeup word duration_ms=%d", duration_ms)
+    await proxy.speak(
+        "これからウェイクアップワードの録音を開始します。ピッと鳴ったら、ウェイクアップワードを話してください。"
+    )
     await proxy.tone(4000, 200)
-    raw_audio = await proxy.listen_raw(duration=3000)  # 3秒間録音
+    raw_audio = await proxy.listen_raw(duration=duration_ms)
+    await asyncio.sleep(0.5)
     await proxy.tone(1000, 200)
+
+    output_dir = Path("tmp")
+    output_dir.mkdir(parents=True, exist_ok=True)
+    filename = f"wakeup_word_{datetime.now(UTC).strftime('%Y%m%d_%H%M%S_%f')}.wav"
+    filepath = output_dir / filename
+
+    with wave.open(str(filepath), "wb") as wav_fp:
+        wav_fp.setnchannels(LISTEN_AUDIO_FORMAT.channels)
+        wav_fp.setsampwidth(LISTEN_AUDIO_FORMAT.sample_width)
+        wav_fp.setframerate(LISTEN_AUDIO_FORMAT.sample_rate_hz)
+        wav_fp.writeframes(raw_audio)
+
+    logger.info("Saved wakeup word recording to %s", filepath)
+    return {
+        "path": str(filepath),
+        "bytes": len(raw_audio),
+        "sample_rate": LISTEN_AUDIO_FORMAT.sample_rate_hz,
+        "channels": LISTEN_AUDIO_FORMAT.channels,
+        "sample_width": LISTEN_AUDIO_FORMAT.sample_width,
+        "duration_ms": duration_ms,
+    }
diff --git a/firmware/include/listening.hpp b/firmware/include/listening.hpp
index 0e18ba8..8d2932a 100644
--- a/firmware/include/listening.hpp
+++ b/firmware/include/listening.hpp
@@ -34,6 +34,10 @@ class Listening
   // 無音が所定時間続いているか判定
   bool shouldStopForSilence() const;
 
+  // 固定時間録音モードを設定（0で通常の無音停止モード）
+  void setFixedDurationMs(uint32_t durationMs);
+  bool shouldStopForFixedDuration() const;
+
 private:
   void updateLevelStats(const int16_t *samples, size_t sampleCount);
   bool sendPacket(stackchan_websocket_v1_MessageType type, const int16_t *samples, size_t sampleCount);
@@ -60,6 +64,8 @@ class Listening
   // 無音判定関連
   int32_t last_level_ = 0;
   uint32_t silence_since_ms_ = 0;
+  uint32_t stream_started_ms_ = 0;
+  uint32_t fixed_duration_ms_ = 0;
   static constexpr int32_t kSilenceLevelThreshold = 200;     // 平均絶対値がこの値以下を無音とみなす
   static constexpr uint32_t kSilenceDurationMs = 3000;        // 無音とみなす継続時間
 };
diff --git a/firmware/lib/generated_protobuf/websocket-message.pb.c b/firmware/lib/generated_protobuf/websocket-message.pb.c
index f70a79e..a25a717 100644
--- a/firmware/lib/generated_protobuf/websocket-message.pb.c
+++ b/firmware/lib/generated_protobuf/websocket-message.pb.c
@@ -45,6 +45,12 @@ PB_BIND(stackchan_websocket_v1_ServoCommand, stackchan_websocket_v1_ServoCommand
 PB_BIND(stackchan_websocket_v1_ServoDoneEvent, stackchan_websocket_v1_ServoDoneEvent, AUTO)
 
 
+PB_BIND(stackchan_websocket_v1_ToneCommand, stackchan_websocket_v1_ToneCommand, AUTO)
+
+
+PB_BIND(stackchan_websocket_v1_ToneDoneEvent, stackchan_websocket_v1_ToneDoneEvent, AUTO)
+
+
 PB_BIND(stackchan_websocket_v1_FirmwareMetadata, stackchan_websocket_v1_FirmwareMetadata, AUTO)
 
 
diff --git a/firmware/lib/generated_protobuf/websocket-message.pb.h b/firmware/lib/generated_protobuf/websocket-message.pb.h
index 8e0c222..60a5882 100644
--- a/firmware/lib/generated_protobuf/websocket-message.pb.h
+++ b/firmware/lib/generated_protobuf/websocket-message.pb.h
@@ -21,7 +21,9 @@ typedef enum _stackchan_websocket_v1_MessageKind {
     stackchan_websocket_v1_MessageKind_MESSAGE_KIND_SERVO_CMD = 7,
     stackchan_websocket_v1_MessageKind_MESSAGE_KIND_SERVO_DONE_EVT = 8,
     stackchan_websocket_v1_MessageKind_MESSAGE_KIND_FIRMWARE_METADATA = 9,
-    stackchan_websocket_v1_MessageKind_MESSAGE_KIND_SERVER_METADATA = 10
+    stackchan_websocket_v1_MessageKind_MESSAGE_KIND_SERVER_METADATA = 10,
+    stackchan_websocket_v1_MessageKind_MESSAGE_KIND_TONE_CMD = 11,
+    stackchan_websocket_v1_MessageKind_MESSAGE_KIND_TONE_DONE_EVT = 12
 } stackchan_websocket_v1_MessageKind;
 
 typedef enum _stackchan_websocket_v1_MessageType {
@@ -83,6 +85,7 @@ typedef struct _stackchan_websocket_v1_AudioChunk {
 
 typedef struct _stackchan_websocket_v1_StateCommand {
     stackchan_websocket_v1_StackchanState state;
+    uint32_t listening_duration_ms; /* used when state=LISTENING, 0 means silence-based stop */
 } stackchan_websocket_v1_StateCommand;
 
 typedef struct _stackchan_websocket_v1_WakeWordEvent {
@@ -112,6 +115,15 @@ typedef struct _stackchan_websocket_v1_ServoDoneEvent {
     bool done;
 } stackchan_websocket_v1_ServoDoneEvent;
 
+typedef struct _stackchan_websocket_v1_ToneCommand {
+    float frequency;
+    uint32_t duration_ms;
+} stackchan_websocket_v1_ToneCommand;
+
+typedef struct _stackchan_websocket_v1_ToneDoneEvent {
+    bool done;
+} stackchan_websocket_v1_ToneDoneEvent;
+
 typedef struct _stackchan_websocket_v1_FirmwareMetadata {
     stackchan_websocket_v1_DeviceType device_type;
     uint32_t display_width;
@@ -155,6 +167,8 @@ typedef struct _stackchan_websocket_v1_WebSocketMessage {
         stackchan_websocket_v1_ServoDoneEvent servo_done_evt;
         stackchan_websocket_v1_FirmwareMetadata firmware_metadata;
         stackchan_websocket_v1_ServerMetadata server_metadata;
+        stackchan_websocket_v1_ToneCommand tone_cmd;
+        stackchan_websocket_v1_ToneDoneEvent tone_done_evt;
     } body;
 } stackchan_websocket_v1_WebSocketMessage;
 
@@ -165,8 +179,8 @@ extern "C" {
 
 /* Helper constants for enums */
 #define _stackchan_websocket_v1_MessageKind_MIN stackchan_websocket_v1_MessageKind_MESSAGE_KIND_UNSPECIFIED
-#define _stackchan_websocket_v1_MessageKind_MAX stackchan_websocket_v1_MessageKind_MESSAGE_KIND_SERVER_METADATA
-#define _stackchan_websocket_v1_MessageKind_ARRAYSIZE ((stackchan_websocket_v1_MessageKind)(stackchan_websocket_v1_MessageKind_MESSAGE_KIND_SERVER_METADATA+1))
+#define _stackchan_websocket_v1_MessageKind_MAX stackchan_websocket_v1_MessageKind_MESSAGE_KIND_TONE_DONE_EVT
+#define _stackchan_websocket_v1_MessageKind_ARRAYSIZE ((stackchan_websocket_v1_MessageKind)(stackchan_websocket_v1_MessageKind_MESSAGE_KIND_TONE_DONE_EVT+1))
 
 #define _stackchan_websocket_v1_MessageType_MIN stackchan_websocket_v1_MessageType_MESSAGE_TYPE_UNSPECIFIED
 #define _stackchan_websocket_v1_MessageType_MAX stackchan_websocket_v1_MessageType_MESSAGE_TYPE_END
@@ -206,6 +220,8 @@ extern "C" {
 #define stackchan_websocket_v1_ServoCommand_op_ENUMTYPE stackchan_websocket_v1_ServoOperation
 
 
+
+
 #define stackchan_websocket_v1_FirmwareMetadata_device_type_ENUMTYPE stackchan_websocket_v1_DeviceType
 #define stackchan_websocket_v1_FirmwareMetadata_servo_type_ENUMTYPE stackchan_websocket_v1_ServoType
 
@@ -218,13 +234,15 @@ extern "C" {
 #define stackchan_websocket_v1_AudioWavStart_init_default {0, 0}
 #define stackchan_websocket_v1_AudioWavEnd_init_default {0}
 #define stackchan_websocket_v1_AudioChunk_init_default {{0, {0}}}
-#define stackchan_websocket_v1_StateCommand_init_default {_stackchan_websocket_v1_StackchanState_MIN}
+#define stackchan_websocket_v1_StateCommand_init_default {_stackchan_websocket_v1_StackchanState_MIN, 0}
 #define stackchan_websocket_v1_WakeWordEvent_init_default {0}
 #define stackchan_websocket_v1_StateEvent_init_default {_stackchan_websocket_v1_StackchanState_MIN}
 #define stackchan_websocket_v1_SpeakDoneEvent_init_default {0}
 #define stackchan_websocket_v1_ServoCommandSequence_init_default {0, {stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default, stackchan_websocket_v1_ServoCommand_init_default}}
 #define stackchan_websocket_v1_ServoCommand_init_default {_stackchan_websocket_v1_ServoOperation_MIN, 0, 0}
 #define stackchan_websocket_v1_ServoDoneEvent_init_default {0}
+#define stackchan_websocket_v1_ToneCommand_init_default {0, 0}
+#define stackchan_websocket_v1_ToneDoneEvent_init_default {0}
 #define stackchan_websocket_v1_FirmwareMetadata_init_default {_stackchan_websocket_v1_DeviceType_MIN, 0, 0, 0, 0, _stackchan_websocket_v1_ServoType_MIN, 0, ""}
 #define stackchan_websocket_v1_ServerMetadata_init_default {0, ""}
 #define stackchan_websocket_v1_WebSocketMessage_init_zero {_stackchan_websocket_v1_MessageKind_MIN, _stackchan_websocket_v1_MessageType_MIN, 0, 0, {stackchan_websocket_v1_AudioPcmStart_init_zero}}
@@ -233,13 +251,15 @@ extern "C" {
 #define stackchan_websocket_v1_AudioWavStart_init_zero {0, 0}
 #define stackchan_websocket_v1_AudioWavEnd_init_zero {0}
 #define stackchan_websocket_v1_AudioChunk_init_zero {{0, {0}}}
-#define stackchan_websocket_v1_StateCommand_init_zero {_stackchan_websocket_v1_StackchanState_MIN}
+#define stackchan_websocket_v1_StateCommand_init_zero {_stackchan_websocket_v1_StackchanState_MIN, 0}
 #define stackchan_websocket_v1_WakeWordEvent_init_zero {0}
 #define stackchan_websocket_v1_StateEvent_init_zero {_stackchan_websocket_v1_StackchanState_MIN}
 #define stackchan_websocket_v1_SpeakDoneEvent_init_zero {0}
 #define stackchan_websocket_v1_ServoCommandSequence_init_zero {0, {stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero, stackchan_websocket_v1_ServoCommand_init_zero}}
 #define stackchan_websocket_v1_ServoCommand_init_zero {_stackchan_websocket_v1_ServoOperation_MIN, 0, 0}
 #define stackchan_websocket_v1_ServoDoneEvent_init_zero {0}
+#define stackchan_websocket_v1_ToneCommand_init_zero {0, 0}
+#define stackchan_websocket_v1_ToneDoneEvent_init_zero {0}
 #define stackchan_websocket_v1_FirmwareMetadata_init_zero {_stackchan_websocket_v1_DeviceType_MIN, 0, 0, 0, 0, _stackchan_websocket_v1_ServoType_MIN, 0, ""}
 #define stackchan_websocket_v1_ServerMetadata_init_zero {0, ""}
 
@@ -248,6 +268,7 @@ extern "C" {
 #define stackchan_websocket_v1_AudioWavStart_channels_tag 2
 #define stackchan_websocket_v1_AudioChunk_pcm_bytes_tag 1
 #define stackchan_websocket_v1_StateCommand_state_tag 1
+#define stackchan_websocket_v1_StateCommand_listening_duration_ms_tag 2
 #define stackchan_websocket_v1_WakeWordEvent_detected_tag 1
 #define stackchan_websocket_v1_StateEvent_state_tag 1
 #define stackchan_websocket_v1_SpeakDoneEvent_done_tag 1
@@ -256,6 +277,9 @@ extern "C" {
 #define stackchan_websocket_v1_ServoCommand_duration_ms_tag 3
 #define stackchan_websocket_v1_ServoCommandSequence_commands_tag 1
 #define stackchan_websocket_v1_ServoDoneEvent_done_tag 1
+#define stackchan_websocket_v1_ToneCommand_frequency_tag 1
+#define stackchan_websocket_v1_ToneCommand_duration_ms_tag 2
+#define stackchan_websocket_v1_ToneDoneEvent_done_tag 1
 #define stackchan_websocket_v1_FirmwareMetadata_device_type_tag 1
 #define stackchan_websocket_v1_FirmwareMetadata_display_width_tag 2
 #define stackchan_websocket_v1_FirmwareMetadata_display_height_tag 3
@@ -283,6 +307,8 @@ extern "C" {
 #define stackchan_websocket_v1_WebSocketMessage_servo_done_evt_tag 35
 #define stackchan_websocket_v1_WebSocketMessage_firmware_metadata_tag 36
 #define stackchan_websocket_v1_WebSocketMessage_server_metadata_tag 37
+#define stackchan_websocket_v1_WebSocketMessage_tone_cmd_tag 38
+#define stackchan_websocket_v1_WebSocketMessage_tone_done_evt_tag 39
 
 /* Struct field encoding specification for nanopb */
 #define stackchan_websocket_v1_WebSocketMessage_FIELDLIST(X, a) \
@@ -302,7 +328,9 @@ X(a, STATIC,   ONEOF,    MESSAGE,  (body,speak_done_evt,body.speak_done_evt),  3
 X(a, STATIC,   ONEOF,    MESSAGE,  (body,servo_cmd,body.servo_cmd),  34) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (body,servo_done_evt,body.servo_done_evt),  35) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (body,firmware_metadata,body.firmware_metadata),  36) \
-X(a, STATIC,   ONEOF,    MESSAGE,  (body,server_metadata,body.server_metadata),  37)
+X(a, STATIC,   ONEOF,    MESSAGE,  (body,server_metadata,body.server_metadata),  37) \
+X(a, STATIC,   ONEOF,    MESSAGE,  (body,tone_cmd,body.tone_cmd),  38) \
+X(a, STATIC,   ONEOF,    MESSAGE,  (body,tone_done_evt,body.tone_done_evt),  39)
 #define stackchan_websocket_v1_WebSocketMessage_CALLBACK NULL
 #define stackchan_websocket_v1_WebSocketMessage_DEFAULT NULL
 #define stackchan_websocket_v1_WebSocketMessage_body_audio_pcm_start_MSGTYPE stackchan_websocket_v1_AudioPcmStart
@@ -319,6 +347,8 @@ X(a, STATIC,   ONEOF,    MESSAGE,  (body,server_metadata,body.server_metadata),
 #define stackchan_websocket_v1_WebSocketMessage_body_servo_done_evt_MSGTYPE stackchan_websocket_v1_ServoDoneEvent
 #define stackchan_websocket_v1_WebSocketMessage_body_firmware_metadata_MSGTYPE stackchan_websocket_v1_FirmwareMetadata
 #define stackchan_websocket_v1_WebSocketMessage_body_server_metadata_MSGTYPE stackchan_websocket_v1_ServerMetadata
+#define stackchan_websocket_v1_WebSocketMessage_body_tone_cmd_MSGTYPE stackchan_websocket_v1_ToneCommand
+#define stackchan_websocket_v1_WebSocketMessage_body_tone_done_evt_MSGTYPE stackchan_websocket_v1_ToneDoneEvent
 
 #define stackchan_websocket_v1_AudioPcmStart_FIELDLIST(X, a) \
 
@@ -347,7 +377,8 @@ X(a, STATIC,   SINGULAR, BYTES,    pcm_bytes,         1)
 #define stackchan_websocket_v1_AudioChunk_DEFAULT NULL
 
 #define stackchan_websocket_v1_StateCommand_FIELDLIST(X, a) \
-X(a, STATIC,   SINGULAR, UENUM,    state,             1)
+X(a, STATIC,   SINGULAR, UENUM,    state,             1) \
+X(a, STATIC,   SINGULAR, UINT32,   listening_duration_ms,   2)
 #define stackchan_websocket_v1_StateCommand_CALLBACK NULL
 #define stackchan_websocket_v1_StateCommand_DEFAULT NULL
 
@@ -384,6 +415,17 @@ X(a, STATIC,   SINGULAR, BOOL,     done,              1)
 #define stackchan_websocket_v1_ServoDoneEvent_CALLBACK NULL
 #define stackchan_websocket_v1_ServoDoneEvent_DEFAULT NULL
 
+#define stackchan_websocket_v1_ToneCommand_FIELDLIST(X, a) \
+X(a, STATIC,   SINGULAR, FLOAT,    frequency,         1) \
+X(a, STATIC,   SINGULAR, UINT32,   duration_ms,       2)
+#define stackchan_websocket_v1_ToneCommand_CALLBACK NULL
+#define stackchan_websocket_v1_ToneCommand_DEFAULT NULL
+
+#define stackchan_websocket_v1_ToneDoneEvent_FIELDLIST(X, a) \
+X(a, STATIC,   SINGULAR, BOOL,     done,              1)
+#define stackchan_websocket_v1_ToneDoneEvent_CALLBACK NULL
+#define stackchan_websocket_v1_ToneDoneEvent_DEFAULT NULL
+
 #define stackchan_websocket_v1_FirmwareMetadata_FIELDLIST(X, a) \
 X(a, STATIC,   SINGULAR, UENUM,    device_type,       1) \
 X(a, STATIC,   SINGULAR, UINT32,   display_width,     2) \
@@ -415,6 +457,8 @@ extern const pb_msgdesc_t stackchan_websocket_v1_SpeakDoneEvent_msg;
 extern const pb_msgdesc_t stackchan_websocket_v1_ServoCommandSequence_msg;
 extern const pb_msgdesc_t stackchan_websocket_v1_ServoCommand_msg;
 extern const pb_msgdesc_t stackchan_websocket_v1_ServoDoneEvent_msg;
+extern const pb_msgdesc_t stackchan_websocket_v1_ToneCommand_msg;
+extern const pb_msgdesc_t stackchan_websocket_v1_ToneDoneEvent_msg;
 extern const pb_msgdesc_t stackchan_websocket_v1_FirmwareMetadata_msg;
 extern const pb_msgdesc_t stackchan_websocket_v1_ServerMetadata_msg;
 
@@ -432,6 +476,8 @@ extern const pb_msgdesc_t stackchan_websocket_v1_ServerMetadata_msg;
 #define stackchan_websocket_v1_ServoCommandSequence_fields &stackchan_websocket_v1_ServoCommandSequence_msg
 #define stackchan_websocket_v1_ServoCommand_fields &stackchan_websocket_v1_ServoCommand_msg
 #define stackchan_websocket_v1_ServoDoneEvent_fields &stackchan_websocket_v1_ServoDoneEvent_msg
+#define stackchan_websocket_v1_ToneCommand_fields &stackchan_websocket_v1_ToneCommand_msg
+#define stackchan_websocket_v1_ToneDoneEvent_fields &stackchan_websocket_v1_ToneDoneEvent_msg
 #define stackchan_websocket_v1_FirmwareMetadata_fields &stackchan_websocket_v1_FirmwareMetadata_msg
 #define stackchan_websocket_v1_ServerMetadata_fields &stackchan_websocket_v1_ServerMetadata_msg
 
@@ -448,8 +494,10 @@ extern const pb_msgdesc_t stackchan_websocket_v1_ServerMetadata_msg;
 #define stackchan_websocket_v1_ServoCommand_size 14
 #define stackchan_websocket_v1_ServoDoneEvent_size 2
 #define stackchan_websocket_v1_SpeakDoneEvent_size 2
-#define stackchan_websocket_v1_StateCommand_size 2
+#define stackchan_websocket_v1_StateCommand_size 8
 #define stackchan_websocket_v1_StateEvent_size   2
+#define stackchan_websocket_v1_ToneCommand_size  11
+#define stackchan_websocket_v1_ToneDoneEvent_size 2
 #define stackchan_websocket_v1_WakeWordEvent_size 2
 #define stackchan_websocket_v1_WebSocketMessage_size 4113
 
diff --git a/firmware/src/listening.cpp b/firmware/src/listening.cpp
index edb2e35..cb7866f 100644
--- a/firmware/src/listening.cpp
+++ b/firmware/src/listening.cpp
@@ -49,6 +49,7 @@ void Listening::end()
 {
   stopStreaming();
   M5.Mic.end();
+  fixed_duration_ms_ = 0;
 }
 
 bool Listening::startStreaming()
@@ -57,6 +58,7 @@ bool Listening::startStreaming()
   seq_counter_ = 0;
   last_level_ = 0;
   silence_since_ms_ = 0;
+  stream_started_ms_ = millis();
   streaming_ = true;
   return sendPacket(stackchan_websocket_v1_MessageType_MESSAGE_TYPE_START, nullptr, 0);
 }
@@ -128,10 +130,18 @@ void Listening::loop()
     }
   }
 
-  // 無音が3秒続いたら終了
-  if (shouldStopForSilence())
+  // 固定時間録音 or 無音が3秒続いたら終了
+  if ((fixed_duration_ms_ > 0 && shouldStopForFixedDuration()) ||
+      (fixed_duration_ms_ == 0 && shouldStopForSilence()))
   {
-    log_i("Auto stop: silence detected (avg=%ld)", static_cast<long>(last_level_));
+    if (fixed_duration_ms_ > 0)
+    {
+      log_i("Auto stop: fixed duration reached (%lu ms)", static_cast<unsigned long>(fixed_duration_ms_));
+    }
+    else
+    {
+      log_i("Auto stop: silence detected (avg=%ld)", static_cast<long>(last_level_));
+    }
     if (!stopStreaming())
     {
       log_i("WS send failed (tail/end)");
@@ -187,6 +197,22 @@ bool Listening::shouldStopForSilence() const
   return elapsed >= kSilenceDurationMs;
 }
 
+void Listening::setFixedDurationMs(uint32_t durationMs)
+{
+  fixed_duration_ms_ = durationMs;
+}
+
+bool Listening::shouldStopForFixedDuration() const
+{
+  if (fixed_duration_ms_ == 0 || stream_started_ms_ == 0)
+  {
+    return false;
+  }
+
+  uint32_t elapsed = millis() - stream_started_ms_;
+  return elapsed >= fixed_duration_ms_;
+}
+
 bool Listening::sendPacket(stackchan_websocket_v1_MessageType type, const int16_t *samples, size_t sampleCount)
 {
   if ((WiFi.status() != WL_CONNECTED) || !ws_.isConnected())
diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index 9756ec0..f35ad68 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -42,8 +42,10 @@ namespace
 uint32_t g_uplink_seq = 0;
 uint32_t g_last_comm_ms = 0;
 constexpr uint32_t kCommTimeoutMs = 60000;
+constexpr int kToneChannel = 1;
 stackchan_websocket_v1_WebSocketMessage g_tx_message = stackchan_websocket_v1_WebSocketMessage_init_zero;
 stackchan_websocket_v1_WebSocketMessage g_rx_message = stackchan_websocket_v1_WebSocketMessage_init_zero;
+bool g_tone_playing = false;
 
 void markCommunicationActive()
 {
@@ -163,20 +165,39 @@ void notifyServoDone()
   }
 }
 
+void notifyToneDone()
+{
+  auto &message = g_tx_message;
+  message = stackchan_websocket_v1_WebSocketMessage_init_zero;
+  message.kind = stackchan_websocket_v1_MessageKind_MESSAGE_KIND_TONE_DONE_EVT;
+  message.message_type = stackchan_websocket_v1_MessageType_MESSAGE_TYPE_DATA;
+  message.seq = g_uplink_seq++;
+  message.which_body = stackchan_websocket_v1_WebSocketMessage_tone_done_evt_tag;
+  message.body.tone_done_evt.done = true;
+  if (!sendUplinkMessage(message))
+  {
+    log_w("Failed to send ToneDoneEvt");
+  }
+}
+
 bool applyRemoteStateCommand(const stackchan_websocket_v1_StateCommand &command)
 {
   switch (command.state)
   {
   case stackchan_websocket_v1_StackchanState_STACKCHAN_STATE_IDLE:
+    listening.setFixedDurationMs(0);
     stateMachine.setState(StateMachine::Idle);
     return true;
   case stackchan_websocket_v1_StackchanState_STACKCHAN_STATE_LISTENING:
+    listening.setFixedDurationMs(command.listening_duration_ms);
     stateMachine.setState(StateMachine::Listening);
     return true;
   case stackchan_websocket_v1_StackchanState_STACKCHAN_STATE_THINKING:
+    listening.setFixedDurationMs(0);
     stateMachine.setState(StateMachine::Thinking);
     return true;
   case stackchan_websocket_v1_StackchanState_STACKCHAN_STATE_SPEAKING:
+    listening.setFixedDurationMs(0);
     stateMachine.setState(StateMachine::Speaking);
     return true;
   default:
@@ -234,6 +255,52 @@ bool applyServoCommand(const stackchan_websocket_v1_ServoCommandSequence &sequen
   }
   return true;
 }
+
+bool applyToneCommand(const stackchan_websocket_v1_ToneCommand &command)
+{
+  if (command.frequency <= 0.0f)
+  {
+    log_w("ToneCmd frequency must be positive");
+    return false;
+  }
+  if (command.duration_ms == 0)
+  {
+    log_w("ToneCmd duration must be positive");
+    return false;
+  }
+
+  if (!M5.Speaker.tone(command.frequency, command.duration_ms, kToneChannel, true))
+  {
+    log_w(
+        "Failed to start tone frequency=%.1f duration=%lu",
+        command.frequency,
+        static_cast<unsigned long>(command.duration_ms));
+    return false;
+  }
+
+  g_tone_playing = true;
+  log_i(
+      "ToneCmd frequency=%.1f duration=%lu",
+      command.frequency,
+      static_cast<unsigned long>(command.duration_ms));
+  return true;
+}
+
+void pollTonePlayback()
+{
+  if (!g_tone_playing)
+  {
+    return;
+  }
+
+  if (M5.Speaker.isPlaying(kToneChannel) != 0)
+  {
+    return;
+  }
+
+  g_tone_playing = false;
+  notifyToneDone();
+}
 } // namespace
 
 void connectWiFi()
@@ -335,6 +402,17 @@ void handleWsEvent(WStype_t type, uint8_t *payload, size_t length)
         log_w("ServoCmd protobuf body mismatch type=%u body=%u", (unsigned)rx.message_type, (unsigned)rx.which_body);
       }
       break;
+    case stackchan_websocket_v1_MessageKind_MESSAGE_KIND_TONE_CMD:
+      if (rx.message_type == stackchan_websocket_v1_MessageType_MESSAGE_TYPE_DATA &&
+          rx.which_body == stackchan_websocket_v1_WebSocketMessage_tone_cmd_tag)
+      {
+        applyToneCommand(rx.body.tone_cmd);
+      }
+      else
+      {
+        log_w("ToneCmd protobuf body mismatch type=%u body=%u", (unsigned)rx.message_type, (unsigned)rx.which_body);
+      }
+      break;
     case stackchan_websocket_v1_MessageKind_MESSAGE_KIND_SERVER_METADATA:
       if (rx.message_type == stackchan_websocket_v1_MessageType_MESSAGE_TYPE_DATA &&
           rx.which_body == stackchan_websocket_v1_WebSocketMessage_server_metadata_tag)
@@ -452,6 +530,7 @@ void loop()
   wsClient.loop();
   handleCommunicationTimeout();
   servo.loop();
+  pollTonePlayback();
 
   StateMachine::State current = stateMachine.getState();
   switch (current)
diff --git a/protobuf/websocket-message.proto b/protobuf/websocket-message.proto
index c643673..742c131 100644
--- a/protobuf/websocket-message.proto
+++ b/protobuf/websocket-message.proto
@@ -31,6 +31,8 @@ message WebSocketMessage {
     ServoDoneEvent servo_done_evt = 35;
     FirmwareMetadata firmware_metadata = 36;
     ServerMetadata server_metadata = 37;
+    ToneCommand tone_cmd = 38;
+    ToneDoneEvent tone_done_evt = 39;
   }
 }
 
@@ -46,6 +48,8 @@ enum MessageKind {
   MESSAGE_KIND_SERVO_DONE_EVT = 8;
   MESSAGE_KIND_FIRMWARE_METADATA = 9;
   MESSAGE_KIND_SERVER_METADATA = 10;
+  MESSAGE_KIND_TONE_CMD = 11;
+  MESSAGE_KIND_TONE_DONE_EVT = 12;
 }
 
 enum MessageType {
@@ -99,6 +103,7 @@ message AudioChunk {
 
 message StateCommand {
   StackchanState state = 1;
+  uint32 listening_duration_ms = 2; // used when state=LISTENING, 0 means silence-based stop
 }
 
 message WakeWordEvent {
@@ -127,6 +132,15 @@ message ServoDoneEvent {
   bool done = 1;
 }
 
+message ToneCommand {
+  float frequency = 1;
+  uint32 duration_ms = 2;
+}
+
+message ToneDoneEvent {
+  bool done = 1;
+}
+
 message FirmwareMetadata {
   DeviceType device_type = 1;
   uint32 display_width = 2;
diff --git a/stackchan_server/app.py b/stackchan_server/app.py
index 14496d2..93b6182 100644
--- a/stackchan_server/app.py
+++ b/stackchan_server/app.py
@@ -2,9 +2,9 @@
 
 import asyncio
 from logging import getLogger
-from typing import Awaitable, Callable, Optional
+from typing import Any, Awaitable, Callable, Optional
 
-from fastapi import FastAPI, HTTPException, WebSocket, WebSocketDisconnect
+from fastapi import Body, FastAPI, HTTPException, WebSocket, WebSocketDisconnect
 from pydantic import BaseModel
 
 from .speech_recognition import create_speech_recognizer
@@ -35,6 +35,7 @@ def __init__(
         self.fastapi = FastAPI(title="StackChan WebSocket Server")
         self._setup_fn: Optional[Callable[[WsProxy], Awaitable[None]]] = None
         self._talk_session_fn: Optional[Callable[[WsProxy], Awaitable[None]]] = None
+        self._webapi_paths: set[str] = set()
         self._proxies: dict[str, WsProxy] = {}
         self._proxies_lock = asyncio.Lock()
 
@@ -79,6 +80,39 @@ def talk_session(self, fn: Callable[["WsProxy"], Awaitable[None]]):
         self._talk_session_fn = fn
         return fn
 
+    def webapi(
+        self, path: str
+    ) -> Callable[[Callable[["WsProxy", dict[str, Any]], Awaitable[Any]]], Callable[["WsProxy", dict[str, Any]], Awaitable[Any]]]:
+        normalized_path = path if path.startswith("/") else f"/{path}"
+        route_path = f"/v1/stackchan/{{stackchan_ip}}{normalized_path}"
+
+        def decorator(
+            fn: Callable[["WsProxy", dict[str, Any]], Awaitable[Any]]
+        ) -> Callable[["WsProxy", dict[str, Any]], Awaitable[Any]]:
+            if route_path in self._webapi_paths:
+                raise ValueError(f"webapi route already registered: {route_path}")
+            route_name = getattr(fn, "__name__", "webapi_handler")
+
+            async def _webapi_handler(
+                stackchan_ip: str,
+                body: dict[str, Any] | None = Body(default=None),
+            ) -> Any:
+                proxy = await self._get_proxy(stackchan_ip)
+                if proxy is None:
+                    raise HTTPException(status_code=404, detail="stackchan not connected")
+                return await fn(proxy, body or {})
+
+            self.fastapi.add_api_route(
+                route_path,
+                _webapi_handler,
+                methods=["GET"],
+                name=f"webapi_{route_name}",
+            )
+            self._webapi_paths.add(route_path)
+            return fn
+
+        return decorator
+
     async def _handle_ws(self, websocket: WebSocket) -> None:
         await websocket.accept()
         client_ip = websocket.client.host if websocket.client else "unknown"
diff --git a/stackchan_server/generated_protobuf/websocket_message_pb2.py b/stackchan_server/generated_protobuf/websocket_message_pb2.py
index a7d7a4e..ce1ff52 100644
--- a/stackchan_server/generated_protobuf/websocket_message_pb2.py
+++ b/stackchan_server/generated_protobuf/websocket_message_pb2.py
@@ -24,53 +24,57 @@
 
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x17websocket-message.proto\x12\x16stackchan.websocket.v1\"\x96\x08\n\x10WebSocketMessage\x12\x31\n\x04kind\x18\x01 \x01(\x0e\x32#.stackchan.websocket.v1.MessageKind\x12\x39\n\x0cmessage_type\x18\x02 \x01(\x0e\x32#.stackchan.websocket.v1.MessageType\x12\x0b\n\x03seq\x18\x03 \x01(\r\x12@\n\x0f\x61udio_pcm_start\x18\n \x01(\x0b\x32%.stackchan.websocket.v1.AudioPcmStartH\x00\x12<\n\x0e\x61udio_pcm_data\x18\x0b \x01(\x0b\x32\".stackchan.websocket.v1.AudioChunkH\x00\x12<\n\raudio_pcm_end\x18\x0c \x01(\x0b\x32#.stackchan.websocket.v1.AudioPcmEndH\x00\x12@\n\x0f\x61udio_wav_start\x18\x14 \x01(\x0b\x32%.stackchan.websocket.v1.AudioWavStartH\x00\x12<\n\x0e\x61udio_wav_data\x18\x15 \x01(\x0b\x32\".stackchan.websocket.v1.AudioChunkH\x00\x12<\n\raudio_wav_end\x18\x16 \x01(\x0b\x32#.stackchan.websocket.v1.AudioWavEndH\x00\x12\x39\n\tstate_cmd\x18\x1e \x01(\x0b\x32$.stackchan.websocket.v1.StateCommandH\x00\x12>\n\rwake_word_evt\x18\x1f \x01(\x0b\x32%.stackchan.websocket.v1.WakeWordEventH\x00\x12\x37\n\tstate_evt\x18  \x01(\x0b\x32\".stackchan.websocket.v1.StateEventH\x00\x12@\n\x0espeak_done_evt\x18! \x01(\x0b\x32&.stackchan.websocket.v1.SpeakDoneEventH\x00\x12\x41\n\tservo_cmd\x18\" \x01(\x0b\x32,.stackchan.websocket.v1.ServoCommandSequenceH\x00\x12@\n\x0eservo_done_evt\x18# \x01(\x0b\x32&.stackchan.websocket.v1.ServoDoneEventH\x00\x12\x45\n\x11\x66irmware_metadata\x18$ \x01(\x0b\x32(.stackchan.websocket.v1.FirmwareMetadataH\x00\x12\x41\n\x0fserver_metadata\x18% \x01(\x0b\x32&.stackchan.websocket.v1.ServerMetadataH\x00\x42\x06\n\x04\x62ody\"\x0f\n\rAudioPcmStart\"\r\n\x0b\x41udioPcmEnd\"6\n\rAudioWavStart\x12\x13\n\x0bsample_rate\x18\x01 \x01(\r\x12\x10\n\x08\x63hannels\x18\x02 \x01(\r\"\r\n\x0b\x41udioWavEnd\"\x1f\n\nAudioChunk\x12\x11\n\tpcm_bytes\x18\x01 \x01(\x0c\"E\n\x0cStateCommand\x12\x35\n\x05state\x18\x01 \x01(\x0e\x32&.stackchan.websocket.v1.StackchanState\"!\n\rWakeWordEvent\x12\x10\n\x08\x64\x65tected\x18\x01 \x01(\x08\"C\n\nStateEvent\x12\x35\n\x05state\x18\x01 \x01(\x0e\x32&.stackchan.websocket.v1.StackchanState\"\x1e\n\x0eSpeakDoneEvent\x12\x0c\n\x04\x64one\x18\x01 \x01(\x08\"N\n\x14ServoCommandSequence\x12\x36\n\x08\x63ommands\x18\x01 \x03(\x0b\x32$.stackchan.websocket.v1.ServoCommand\"f\n\x0cServoCommand\x12\x32\n\x02op\x18\x01 \x01(\x0e\x32&.stackchan.websocket.v1.ServoOperation\x12\r\n\x05\x61ngle\x18\x02 \x01(\x11\x12\x13\n\x0b\x64uration_ms\x18\x03 \x01(\x11\"\x1e\n\x0eServoDoneEvent\x12\x0c\n\x04\x64one\x18\x01 \x01(\x08\"\x99\x02\n\x10\x46irmwareMetadata\x12\x37\n\x0b\x64\x65vice_type\x18\x01 \x01(\x0e\x32\".stackchan.websocket.v1.DeviceType\x12\x15\n\rdisplay_width\x18\x02 \x01(\r\x12\x16\n\x0e\x64isplay_height\x18\x03 \x01(\r\x12\x1c\n\x14has_device_wake_word\x18\x04 \x01(\x08\x12\x0f\n\x07has_led\x18\x05 \x01(\x08\x12\x35\n\nservo_type\x18\x06 \x01(\x0e\x32!.stackchan.websocket.v1.ServoType\x12\x1d\n\x15supports_audio_duplex\x18\x07 \x01(\x08\x12\x18\n\x10\x66irmware_version\x18\x08 \x01(\t\"F\n\x0eServerMetadata\x12\x1c\n\x14has_server_wake_word\x18\x01 \x01(\x08\x12\x16\n\x0eserver_version\x18\x02 \x01(\t*\xdf\x02\n\x0bMessageKind\x12\x1c\n\x18MESSAGE_KIND_UNSPECIFIED\x10\x00\x12\x1a\n\x16MESSAGE_KIND_AUDIO_PCM\x10\x01\x12\x1a\n\x16MESSAGE_KIND_AUDIO_WAV\x10\x02\x12\x1a\n\x16MESSAGE_KIND_STATE_CMD\x10\x03\x12\x1e\n\x1aMESSAGE_KIND_WAKE_WORD_EVT\x10\x04\x12\x1a\n\x16MESSAGE_KIND_STATE_EVT\x10\x05\x12\x1f\n\x1bMESSAGE_KIND_SPEAK_DONE_EVT\x10\x06\x12\x1a\n\x16MESSAGE_KIND_SERVO_CMD\x10\x07\x12\x1f\n\x1bMESSAGE_KIND_SERVO_DONE_EVT\x10\x08\x12\"\n\x1eMESSAGE_KIND_FIRMWARE_METADATA\x10\t\x12 \n\x1cMESSAGE_KIND_SERVER_METADATA\x10\n*p\n\x0bMessageType\x12\x1c\n\x18MESSAGE_TYPE_UNSPECIFIED\x10\x00\x12\x16\n\x12MESSAGE_TYPE_START\x10\x01\x12\x15\n\x11MESSAGE_TYPE_DATA\x10\x02\x12\x14\n\x10MESSAGE_TYPE_END\x10\x03*\x85\x01\n\x0eStackchanState\x12\x18\n\x14STACKCHAN_STATE_IDLE\x10\x00\x12\x1d\n\x19STACKCHAN_STATE_LISTENING\x10\x01\x12\x1c\n\x18STACKCHAN_STATE_THINKING\x10\x02\x12\x1c\n\x18STACKCHAN_STATE_SPEAKING\x10\x03*c\n\x0eServoOperation\x12\x19\n\x15SERVO_OPERATION_SLEEP\x10\x00\x12\x1a\n\x16SERVO_OPERATION_MOVE_X\x10\x01\x12\x1a\n\x16SERVO_OPERATION_MOVE_Y\x10\x02*\x85\x01\n\nDeviceType\x12\x1b\n\x17\x44\x45VICE_TYPE_UNSPECIFIED\x10\x00\x12\x1e\n\x1a\x44\x45VICE_TYPE_M5STACK_CORES3\x10\x01\x12\x1a\n\x16\x44\x45VICE_TYPE_M5ATOM_S3R\x10\x02\x12\x1e\n\x1a\x44\x45VICE_TYPE_M5ATOM_ECHOS3R\x10\x03*i\n\tServoType\x12\x1a\n\x16SERVO_TYPE_UNSPECIFIED\x10\x00\x12\x13\n\x0fSERVO_TYPE_NONE\x10\x01\x12\x13\n\x0fSERVO_TYPE_SG90\x10\x02\x12\x16\n\x12SERVO_TYPE_SCS0009\x10\x03\x62\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x17websocket-message.proto\x12\x16stackchan.websocket.v1\"\x8f\t\n\x10WebSocketMessage\x12\x31\n\x04kind\x18\x01 \x01(\x0e\x32#.stackchan.websocket.v1.MessageKind\x12\x39\n\x0cmessage_type\x18\x02 \x01(\x0e\x32#.stackchan.websocket.v1.MessageType\x12\x0b\n\x03seq\x18\x03 \x01(\r\x12@\n\x0f\x61udio_pcm_start\x18\n \x01(\x0b\x32%.stackchan.websocket.v1.AudioPcmStartH\x00\x12<\n\x0e\x61udio_pcm_data\x18\x0b \x01(\x0b\x32\".stackchan.websocket.v1.AudioChunkH\x00\x12<\n\raudio_pcm_end\x18\x0c \x01(\x0b\x32#.stackchan.websocket.v1.AudioPcmEndH\x00\x12@\n\x0f\x61udio_wav_start\x18\x14 \x01(\x0b\x32%.stackchan.websocket.v1.AudioWavStartH\x00\x12<\n\x0e\x61udio_wav_data\x18\x15 \x01(\x0b\x32\".stackchan.websocket.v1.AudioChunkH\x00\x12<\n\raudio_wav_end\x18\x16 \x01(\x0b\x32#.stackchan.websocket.v1.AudioWavEndH\x00\x12\x39\n\tstate_cmd\x18\x1e \x01(\x0b\x32$.stackchan.websocket.v1.StateCommandH\x00\x12>\n\rwake_word_evt\x18\x1f \x01(\x0b\x32%.stackchan.websocket.v1.WakeWordEventH\x00\x12\x37\n\tstate_evt\x18  \x01(\x0b\x32\".stackchan.websocket.v1.StateEventH\x00\x12@\n\x0espeak_done_evt\x18! \x01(\x0b\x32&.stackchan.websocket.v1.SpeakDoneEventH\x00\x12\x41\n\tservo_cmd\x18\" \x01(\x0b\x32,.stackchan.websocket.v1.ServoCommandSequenceH\x00\x12@\n\x0eservo_done_evt\x18# \x01(\x0b\x32&.stackchan.websocket.v1.ServoDoneEventH\x00\x12\x45\n\x11\x66irmware_metadata\x18$ \x01(\x0b\x32(.stackchan.websocket.v1.FirmwareMetadataH\x00\x12\x41\n\x0fserver_metadata\x18% \x01(\x0b\x32&.stackchan.websocket.v1.ServerMetadataH\x00\x12\x37\n\x08tone_cmd\x18& \x01(\x0b\x32#.stackchan.websocket.v1.ToneCommandH\x00\x12>\n\rtone_done_evt\x18\' \x01(\x0b\x32%.stackchan.websocket.v1.ToneDoneEventH\x00\x42\x06\n\x04\x62ody\"\x0f\n\rAudioPcmStart\"\r\n\x0b\x41udioPcmEnd\"6\n\rAudioWavStart\x12\x13\n\x0bsample_rate\x18\x01 \x01(\r\x12\x10\n\x08\x63hannels\x18\x02 \x01(\r\"\r\n\x0b\x41udioWavEnd\"\x1f\n\nAudioChunk\x12\x11\n\tpcm_bytes\x18\x01 \x01(\x0c\"d\n\x0cStateCommand\x12\x35\n\x05state\x18\x01 \x01(\x0e\x32&.stackchan.websocket.v1.StackchanState\x12\x1d\n\x15listening_duration_ms\x18\x02 \x01(\r\"!\n\rWakeWordEvent\x12\x10\n\x08\x64\x65tected\x18\x01 \x01(\x08\"C\n\nStateEvent\x12\x35\n\x05state\x18\x01 \x01(\x0e\x32&.stackchan.websocket.v1.StackchanState\"\x1e\n\x0eSpeakDoneEvent\x12\x0c\n\x04\x64one\x18\x01 \x01(\x08\"N\n\x14ServoCommandSequence\x12\x36\n\x08\x63ommands\x18\x01 \x03(\x0b\x32$.stackchan.websocket.v1.ServoCommand\"f\n\x0cServoCommand\x12\x32\n\x02op\x18\x01 \x01(\x0e\x32&.stackchan.websocket.v1.ServoOperation\x12\r\n\x05\x61ngle\x18\x02 \x01(\x11\x12\x13\n\x0b\x64uration_ms\x18\x03 \x01(\x11\"\x1e\n\x0eServoDoneEvent\x12\x0c\n\x04\x64one\x18\x01 \x01(\x08\"5\n\x0bToneCommand\x12\x11\n\tfrequency\x18\x01 \x01(\x02\x12\x13\n\x0b\x64uration_ms\x18\x02 \x01(\r\"\x1d\n\rToneDoneEvent\x12\x0c\n\x04\x64one\x18\x01 \x01(\x08\"\x99\x02\n\x10\x46irmwareMetadata\x12\x37\n\x0b\x64\x65vice_type\x18\x01 \x01(\x0e\x32\".stackchan.websocket.v1.DeviceType\x12\x15\n\rdisplay_width\x18\x02 \x01(\r\x12\x16\n\x0e\x64isplay_height\x18\x03 \x01(\r\x12\x1c\n\x14has_device_wake_word\x18\x04 \x01(\x08\x12\x0f\n\x07has_led\x18\x05 \x01(\x08\x12\x35\n\nservo_type\x18\x06 \x01(\x0e\x32!.stackchan.websocket.v1.ServoType\x12\x1d\n\x15supports_audio_duplex\x18\x07 \x01(\x08\x12\x18\n\x10\x66irmware_version\x18\x08 \x01(\t\"F\n\x0eServerMetadata\x12\x1c\n\x14has_server_wake_word\x18\x01 \x01(\x08\x12\x16\n\x0eserver_version\x18\x02 \x01(\t*\x9a\x03\n\x0bMessageKind\x12\x1c\n\x18MESSAGE_KIND_UNSPECIFIED\x10\x00\x12\x1a\n\x16MESSAGE_KIND_AUDIO_PCM\x10\x01\x12\x1a\n\x16MESSAGE_KIND_AUDIO_WAV\x10\x02\x12\x1a\n\x16MESSAGE_KIND_STATE_CMD\x10\x03\x12\x1e\n\x1aMESSAGE_KIND_WAKE_WORD_EVT\x10\x04\x12\x1a\n\x16MESSAGE_KIND_STATE_EVT\x10\x05\x12\x1f\n\x1bMESSAGE_KIND_SPEAK_DONE_EVT\x10\x06\x12\x1a\n\x16MESSAGE_KIND_SERVO_CMD\x10\x07\x12\x1f\n\x1bMESSAGE_KIND_SERVO_DONE_EVT\x10\x08\x12\"\n\x1eMESSAGE_KIND_FIRMWARE_METADATA\x10\t\x12 \n\x1cMESSAGE_KIND_SERVER_METADATA\x10\n\x12\x19\n\x15MESSAGE_KIND_TONE_CMD\x10\x0b\x12\x1e\n\x1aMESSAGE_KIND_TONE_DONE_EVT\x10\x0c*p\n\x0bMessageType\x12\x1c\n\x18MESSAGE_TYPE_UNSPECIFIED\x10\x00\x12\x16\n\x12MESSAGE_TYPE_START\x10\x01\x12\x15\n\x11MESSAGE_TYPE_DATA\x10\x02\x12\x14\n\x10MESSAGE_TYPE_END\x10\x03*\x85\x01\n\x0eStackchanState\x12\x18\n\x14STACKCHAN_STATE_IDLE\x10\x00\x12\x1d\n\x19STACKCHAN_STATE_LISTENING\x10\x01\x12\x1c\n\x18STACKCHAN_STATE_THINKING\x10\x02\x12\x1c\n\x18STACKCHAN_STATE_SPEAKING\x10\x03*c\n\x0eServoOperation\x12\x19\n\x15SERVO_OPERATION_SLEEP\x10\x00\x12\x1a\n\x16SERVO_OPERATION_MOVE_X\x10\x01\x12\x1a\n\x16SERVO_OPERATION_MOVE_Y\x10\x02*\x85\x01\n\nDeviceType\x12\x1b\n\x17\x44\x45VICE_TYPE_UNSPECIFIED\x10\x00\x12\x1e\n\x1a\x44\x45VICE_TYPE_M5STACK_CORES3\x10\x01\x12\x1a\n\x16\x44\x45VICE_TYPE_M5ATOM_S3R\x10\x02\x12\x1e\n\x1a\x44\x45VICE_TYPE_M5ATOM_ECHOS3R\x10\x03*i\n\tServoType\x12\x1a\n\x16SERVO_TYPE_UNSPECIFIED\x10\x00\x12\x13\n\x0fSERVO_TYPE_NONE\x10\x01\x12\x13\n\x0fSERVO_TYPE_SG90\x10\x02\x12\x16\n\x12SERVO_TYPE_SCS0009\x10\x03\x62\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
 _builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'websocket_message_pb2', _globals)
 if not _descriptor._USE_C_DESCRIPTORS:
   DESCRIPTOR._loaded_options = None
-  _globals['_MESSAGEKIND']._serialized_start=2016
-  _globals['_MESSAGEKIND']._serialized_end=2367
-  _globals['_MESSAGETYPE']._serialized_start=2369
-  _globals['_MESSAGETYPE']._serialized_end=2481
-  _globals['_STACKCHANSTATE']._serialized_start=2484
-  _globals['_STACKCHANSTATE']._serialized_end=2617
-  _globals['_SERVOOPERATION']._serialized_start=2619
-  _globals['_SERVOOPERATION']._serialized_end=2718
-  _globals['_DEVICETYPE']._serialized_start=2721
-  _globals['_DEVICETYPE']._serialized_end=2854
-  _globals['_SERVOTYPE']._serialized_start=2856
-  _globals['_SERVOTYPE']._serialized_end=2961
+  _globals['_MESSAGEKIND']._serialized_start=2254
+  _globals['_MESSAGEKIND']._serialized_end=2664
+  _globals['_MESSAGETYPE']._serialized_start=2666
+  _globals['_MESSAGETYPE']._serialized_end=2778
+  _globals['_STACKCHANSTATE']._serialized_start=2781
+  _globals['_STACKCHANSTATE']._serialized_end=2914
+  _globals['_SERVOOPERATION']._serialized_start=2916
+  _globals['_SERVOOPERATION']._serialized_end=3015
+  _globals['_DEVICETYPE']._serialized_start=3018
+  _globals['_DEVICETYPE']._serialized_end=3151
+  _globals['_SERVOTYPE']._serialized_start=3153
+  _globals['_SERVOTYPE']._serialized_end=3258
   _globals['_WEBSOCKETMESSAGE']._serialized_start=52
-  _globals['_WEBSOCKETMESSAGE']._serialized_end=1098
-  _globals['_AUDIOPCMSTART']._serialized_start=1100
-  _globals['_AUDIOPCMSTART']._serialized_end=1115
-  _globals['_AUDIOPCMEND']._serialized_start=1117
-  _globals['_AUDIOPCMEND']._serialized_end=1130
-  _globals['_AUDIOWAVSTART']._serialized_start=1132
-  _globals['_AUDIOWAVSTART']._serialized_end=1186
-  _globals['_AUDIOWAVEND']._serialized_start=1188
-  _globals['_AUDIOWAVEND']._serialized_end=1201
-  _globals['_AUDIOCHUNK']._serialized_start=1203
-  _globals['_AUDIOCHUNK']._serialized_end=1234
-  _globals['_STATECOMMAND']._serialized_start=1236
-  _globals['_STATECOMMAND']._serialized_end=1305
-  _globals['_WAKEWORDEVENT']._serialized_start=1307
-  _globals['_WAKEWORDEVENT']._serialized_end=1340
-  _globals['_STATEEVENT']._serialized_start=1342
-  _globals['_STATEEVENT']._serialized_end=1409
-  _globals['_SPEAKDONEEVENT']._serialized_start=1411
-  _globals['_SPEAKDONEEVENT']._serialized_end=1441
-  _globals['_SERVOCOMMANDSEQUENCE']._serialized_start=1443
-  _globals['_SERVOCOMMANDSEQUENCE']._serialized_end=1521
-  _globals['_SERVOCOMMAND']._serialized_start=1523
-  _globals['_SERVOCOMMAND']._serialized_end=1625
-  _globals['_SERVODONEEVENT']._serialized_start=1627
-  _globals['_SERVODONEEVENT']._serialized_end=1657
-  _globals['_FIRMWAREMETADATA']._serialized_start=1660
-  _globals['_FIRMWAREMETADATA']._serialized_end=1941
-  _globals['_SERVERMETADATA']._serialized_start=1943
-  _globals['_SERVERMETADATA']._serialized_end=2013
+  _globals['_WEBSOCKETMESSAGE']._serialized_end=1219
+  _globals['_AUDIOPCMSTART']._serialized_start=1221
+  _globals['_AUDIOPCMSTART']._serialized_end=1236
+  _globals['_AUDIOPCMEND']._serialized_start=1238
+  _globals['_AUDIOPCMEND']._serialized_end=1251
+  _globals['_AUDIOWAVSTART']._serialized_start=1253
+  _globals['_AUDIOWAVSTART']._serialized_end=1307
+  _globals['_AUDIOWAVEND']._serialized_start=1309
+  _globals['_AUDIOWAVEND']._serialized_end=1322
+  _globals['_AUDIOCHUNK']._serialized_start=1324
+  _globals['_AUDIOCHUNK']._serialized_end=1355
+  _globals['_STATECOMMAND']._serialized_start=1357
+  _globals['_STATECOMMAND']._serialized_end=1457
+  _globals['_WAKEWORDEVENT']._serialized_start=1459
+  _globals['_WAKEWORDEVENT']._serialized_end=1492
+  _globals['_STATEEVENT']._serialized_start=1494
+  _globals['_STATEEVENT']._serialized_end=1561
+  _globals['_SPEAKDONEEVENT']._serialized_start=1563
+  _globals['_SPEAKDONEEVENT']._serialized_end=1593
+  _globals['_SERVOCOMMANDSEQUENCE']._serialized_start=1595
+  _globals['_SERVOCOMMANDSEQUENCE']._serialized_end=1673
+  _globals['_SERVOCOMMAND']._serialized_start=1675
+  _globals['_SERVOCOMMAND']._serialized_end=1777
+  _globals['_SERVODONEEVENT']._serialized_start=1779
+  _globals['_SERVODONEEVENT']._serialized_end=1809
+  _globals['_TONECOMMAND']._serialized_start=1811
+  _globals['_TONECOMMAND']._serialized_end=1864
+  _globals['_TONEDONEEVENT']._serialized_start=1866
+  _globals['_TONEDONEEVENT']._serialized_end=1895
+  _globals['_FIRMWAREMETADATA']._serialized_start=1898
+  _globals['_FIRMWAREMETADATA']._serialized_end=2179
+  _globals['_SERVERMETADATA']._serialized_start=2181
+  _globals['_SERVERMETADATA']._serialized_end=2251
 # @@protoc_insertion_point(module_scope)
diff --git a/stackchan_server/listen.py b/stackchan_server/listen.py
index a2c934d..a890a39 100644
--- a/stackchan_server/listen.py
+++ b/stackchan_server/listen.py
@@ -44,7 +44,10 @@ def __init__(
         self._message_ready = asyncio.Event()
         self._message_error: Optional[Exception] = None
         self._transcript: Optional[str] = None
+        self._raw_audio: Optional[bytes] = None
         self._speech_stream: Optional[StreamingSpeechSession] = None
+        self._result_mode: Optional[str] = None
+        self._session_lock = asyncio.Lock()
 
     async def close(self) -> None:
         await self._abort_speech_stream()
@@ -52,43 +55,99 @@ async def close(self) -> None:
     async def listen(
         self,
         *,
+        send_listen_command: Callable[[int | None], Awaitable[None]],
         send_state_command: Callable[[int], Awaitable[None]],
         is_closed: Callable[[], bool],
         idle_state: int,
-        listening_state: int,
     ) -> str:
-        await send_state_command(listening_state)
+        async with self._session_lock:
+            self._prepare_wait("transcript")
+            await send_listen_command(None)
+            result = await self._wait_for_result(
+                is_closed=is_closed,
+                on_inactivity_timeout=lambda: send_state_command(idle_state),
+            )
+            assert isinstance(result, str), "listen expected transcript result"
+            return result
+
+    async def listen_raw(
+        self,
+        *,
+        duration_ms: int,
+        send_listen_command: Callable[[int | None], Awaitable[None]],
+        is_closed: Callable[[], bool],
+    ) -> bytes:
+        async with self._session_lock:
+            self._prepare_wait("raw")
+            await send_listen_command(duration_ms)
+            result = await self._wait_for_result(is_closed=is_closed)
+            assert not isinstance(result, str), "listen_raw expected raw audio result"
+            return result
+
+    def _prepare_wait(self, mode: str) -> None:
+        self._message_ready.clear()
+        self._message_error = None
+        self._transcript = None
+        self._raw_audio = None
+        self._result_mode = mode
+
+    async def _wait_for_result(
+        self,
+        *,
+        is_closed: Callable[[], bool],
+        on_inactivity_timeout: Optional[Callable[[], Awaitable[None]]] = None,
+    ) -> str | bytes:
         loop = asyncio.get_running_loop()
         last_counter = self._pcm_data_counter
         last_data_time = loop.time()
         while True:
             if self._message_error is not None:
                 err = self._message_error
-                self._message_error = None
+                self._reset_pending_result()
                 raise err
             if self._message_ready.is_set():
-                text = self._transcript or ""
-                self._transcript = None
-                self._message_ready.clear()
-                return text
+                if self._result_mode == "raw":
+                    raw_audio = self._raw_audio or b""
+                    self._reset_pending_result()
+                    return raw_audio
+
+                transcript = self._transcript or ""
+                self._reset_pending_result()
+                return transcript
             if is_closed():
+                self._reset_pending_result()
                 raise WebSocketDisconnect()
             if self._pcm_data_counter != last_counter:
                 last_counter = self._pcm_data_counter
                 last_data_time = loop.time()
             if (loop.time() - last_data_time) >= self.listen_audio_timeout_seconds:
-                if not is_closed():
-                    await send_state_command(idle_state)
+                if on_inactivity_timeout is not None and not is_closed():
+                    await on_inactivity_timeout()
+                self._reset_pending_result()
                 raise TimeoutError("Timed out after audio data inactivity from firmware")
             await asyncio.sleep(0.05)
 
+    def _reset_pending_result(self) -> None:
+        self._message_ready.clear()
+        self._message_error = None
+        self._transcript = None
+        self._raw_audio = None
+        self._result_mode = None
+
     async def handle_start(self, websocket: WebSocket) -> bool:
         logger.info("Received START")
+        if self._result_mode is None:
+            asyncio.create_task(
+                websocket.close(code=1003, reason="start received without pending listen request")
+            )
+            return False
         await self._abort_speech_stream()
         self._pcm_buffer = bytearray()
         self._streaming = True
         self._message_error = None
-        if isinstance(self.speech_recognizer, StreamingSpeechRecognizer):
+        if self._result_mode == "transcript" and isinstance(
+            self.speech_recognizer, StreamingSpeechRecognizer
+        ):
             try:
                 self._speech_stream = await self.speech_recognizer.start_stream()
             except Exception:
@@ -151,10 +210,25 @@ async def handle_end(
             await websocket.close(code=1003, reason="invalid accumulated pcm length")
             return
 
-        await send_state_command(thinking_state)
-
         frames = len(self._pcm_buffer) // (self.audio_format.sample_width * self.audio_format.channels)
         duration_seconds = frames / float(self.audio_format.sample_rate_hz)
+        pcm_bytes = bytes(self._pcm_buffer)
+
+        if self._result_mode == "raw":
+            logger.info(
+                "Captured raw audio frames=%d duration=%.3fs bytes=%d",
+                frames,
+                duration_seconds,
+                len(pcm_bytes),
+            )
+            self._streaming = False
+            self._pcm_buffer = bytearray()
+            self._raw_audio = pcm_bytes
+            self._message_ready.set()
+            return
+
+        await send_state_command(thinking_state)
+
         ws_meta = {
             "sample_rate": self.audio_format.sample_rate_hz,
             "frames": frames,
@@ -162,7 +236,7 @@ async def handle_end(
             "duration_seconds": round(duration_seconds, 3),
         }
         if self.debug_recording:
-            _filepath, filename = self._save_wav(bytes(self._pcm_buffer))
+            _filepath, filename = self._save_wav(pcm_bytes)
             ws_meta["text"] = f"Saved as {filename}"
             ws_meta["path"] = f"recordings/{filename}"
         else:
@@ -170,7 +244,7 @@ async def handle_end(
 
         await websocket.send_json(ws_meta)
 
-        transcript = await self._transcribe_async(bytes(self._pcm_buffer))
+        transcript = await self._transcribe_async(pcm_bytes)
 
         self._streaming = False
         self._pcm_buffer = bytearray()
diff --git a/stackchan_server/protobuf_ws.py b/stackchan_server/protobuf_ws.py
index 8569004..ab1cafc 100644
--- a/stackchan_server/protobuf_ws.py
+++ b/stackchan_server/protobuf_ws.py
@@ -92,13 +92,46 @@ def encode_audio_wav_end_message(seq: int) -> bytes:
     return message.SerializeToString()
 
 
-def encode_state_command_message(seq: int, state_id: int) -> bytes:
+def encode_state_command_message(
+    seq: int,
+    state_id: int,
+    *,
+    listening_duration_ms: int | None = None,
+) -> bytes:
     message = _new_message(
         ws_pb2.MESSAGE_KIND_STATE_CMD,
         ws_pb2.MESSAGE_TYPE_DATA,
         seq,
     )
     message.state_cmd.state = int(state_id)
+    if listening_duration_ms is not None:
+        _ensure_range(
+            int(listening_duration_ms),
+            minimum=0,
+            maximum=0xFFFFFFFF,
+            label="listening_duration_ms",
+        )
+        message.state_cmd.listening_duration_ms = int(listening_duration_ms)
+    return message.SerializeToString()
+
+
+def encode_tone_command_message(seq: int, frequency: float, duration_ms: int) -> bytes:
+    if float(frequency) <= 0:
+        raise ValueError(f"frequency must be positive: {frequency}")
+    _ensure_range(
+        int(duration_ms),
+        minimum=1,
+        maximum=0xFFFFFFFF,
+        label="tone duration_ms",
+    )
+
+    message = _new_message(
+        ws_pb2.MESSAGE_KIND_TONE_CMD,
+        ws_pb2.MESSAGE_TYPE_DATA,
+        seq,
+    )
+    message.tone_cmd.frequency = float(frequency)
+    message.tone_cmd.duration_ms = int(duration_ms)
     return message.SerializeToString()
 
 
@@ -176,6 +209,7 @@ def encode_servo_command_message(seq: int, commands: Sequence[ServoCommand]) ->
     "encode_audio_pcm_data_message",
     "encode_audio_pcm_end_message",
     "encode_audio_pcm_start_message",
+    "encode_tone_command_message",
     "encode_audio_wav_data_message",
     "encode_audio_wav_end_message",
     "encode_audio_wav_start_message",
diff --git a/stackchan_server/ws_proxy.py b/stackchan_server/ws_proxy.py
index 1c45236..cb1a6c0 100644
--- a/stackchan_server/ws_proxy.py
+++ b/stackchan_server/ws_proxy.py
@@ -21,6 +21,7 @@
     encode_server_metadata_message,
     encode_servo_command_message,
     encode_state_command_message,
+    encode_tone_command_message,
     parse_websocket_message,
 )
 from .speak import SpeakHandler
@@ -144,6 +145,9 @@ def __init__(
         self._servo_done_counter = 0
         self._servo_sent_counter = 0
         self._pending_servo_wait_targets: deque[int] = deque()
+        self._tone_done_counter = 0
+        self._tone_sent_counter = 0
+        self._pending_tone_wait_targets: deque[int] = deque()
 
     @property
     def closed(self) -> bool:
@@ -173,10 +177,10 @@ async def wait_for_talk_session(self) -> None:
 
     async def listen(self) -> str:
         return await self._listener.listen(
+            send_listen_command=self._send_listen_command,
             send_state_command=self.send_state_command,
             is_closed=lambda: self._closed,
             idle_state=FirmwareState.IDLE,
-            listening_state=FirmwareState.LISTENING,
         )
 
     async def speak(self, text: str) -> None:
@@ -188,6 +192,47 @@ async def speak(self, text: str) -> None:
             is_closed=lambda: self._closed,
         )
 
+    async def tone(
+        self,
+        frequency: float,
+        duration: int,
+        *,
+        timeout_seconds: float | None = None,
+    ) -> None:
+        previous_counter = self._tone_sent_counter
+        target_counter = previous_counter + 1
+        self._tone_sent_counter = target_counter
+        self._pending_tone_wait_targets.append(target_counter)
+        try:
+            await self.ws.send_bytes(
+                encode_tone_command_message(
+                    self._next_down_seq(),
+                    frequency=frequency,
+                    duration_ms=duration,
+                )
+            )
+        except Exception:
+            if (
+                self._pending_tone_wait_targets
+                and self._pending_tone_wait_targets[-1] == target_counter
+            ):
+                self._pending_tone_wait_targets.pop()
+            self._tone_sent_counter = previous_counter
+            raise
+
+        await self.wait_tone_complete(
+            timeout_seconds=max((float(duration) / 1000.0) + 1.0, 5.0)
+            if timeout_seconds is None
+            else timeout_seconds
+        )
+
+    async def listen_raw(self, duration: int = 3000) -> bytes:
+        return await self._listener.listen_raw(
+            duration_ms=duration,
+            send_listen_command=self._send_listen_command,
+            is_closed=lambda: self._closed,
+        )
+
     async def send_state_command(self, state_id: int | FirmwareState) -> None:
         await self._send_state_command(state_id)
 
@@ -226,6 +271,20 @@ async def wait_servo_complete(self, timeout_seconds: float | None = 120.0) -> No
             label="servo completed event",
         )
 
+    async def wait_tone_complete(self, timeout_seconds: float | None = 30.0) -> None:
+        target_counter = (
+            self._pending_tone_wait_targets.popleft()
+            if self._pending_tone_wait_targets
+            else self._tone_done_counter + 1
+        )
+        await self._wait_for_counter(
+            current=lambda: self._tone_done_counter,
+            min_counter=target_counter,
+            timeout_seconds=timeout_seconds,
+            is_closed=lambda: self._closed,
+            label="tone completed event",
+        )
+
     async def start(self) -> None:
         if self._receiving_task is None:
             self._receiving_task = asyncio.create_task(self._receive_loop())
@@ -309,6 +368,10 @@ async def _receive_loop(self) -> None:
                     self._handle_servo_done_event(message)
                     continue
 
+                if message.kind == ws_pb2.MESSAGE_KIND_TONE_DONE_EVT:
+                    self._handle_tone_done_event(message)
+                    continue
+
                 await self.ws.close(code=1003, reason="unsupported kind")
                 break
         except WebSocketDisconnect:
@@ -410,11 +473,30 @@ def _handle_servo_done_event(self, message: Any) -> None:
         self._servo_done_counter += 1
         logger.info("Received servo done event")
 
+    def _handle_tone_done_event(self, message: Any) -> None:
+        if message.message_type != ws_pb2.MESSAGE_TYPE_DATA:
+            return
+        if message.WhichOneof("body") != "tone_done_evt":
+            return
+        if not message.tone_done_evt.done:
+            return
+        self._tone_done_counter += 1
+        logger.info("Received tone done event")
+
     async def _send_state_command(self, state_id: int | FirmwareState) -> None:
         await self.ws.send_bytes(
             encode_state_command_message(self._next_down_seq(), int(state_id))
         )
 
+    async def _send_listen_command(self, duration_ms: int | None) -> None:
+        await self.ws.send_bytes(
+            encode_state_command_message(
+                self._next_down_seq(),
+                int(FirmwareState.LISTENING),
+                listening_duration_ms=duration_ms,
+            )
+        )
+
     async def _wait_for_counter(
         self,
         *,

From 1d23fdccdc15682794464dd09b8c3219a518a324 Mon Sep 17 00:00:00 2001
From: Atsushi Morimoto <74th.tech@gmail.com>
Date: Sun, 19 Apr 2026 17:51:09 +0900
Subject: [PATCH 3/4] feat: improve tone command handling and add listening
 state management

---
 firmware/include/wake_up_word.hpp |  5 -----
 firmware/src/main.cpp             | 28 ++++++++++++++++++++++++----
 firmware/src/speaking.cpp         | 18 ++++++++++++++++--
 firmware/src/wake_up_word.cpp     | 29 +++--------------------------
 stackchan_server/ws_proxy.py      | 20 +++++++++++++++++++-
 5 files changed, 62 insertions(+), 38 deletions(-)

diff --git a/firmware/include/wake_up_word.hpp b/firmware/include/wake_up_word.hpp
index 2d58b49..3af6830 100644
--- a/firmware/include/wake_up_word.hpp
+++ b/firmware/include/wake_up_word.hpp
@@ -33,9 +33,4 @@ class WakeUpWord
   StateMachine &state_;
   const int sample_rate_;
   std::function<void()> on_wake_word_detected_;
-
-  // Idle 時のログ用カウンタ
-  uint32_t loop_count_ = 0;
-  uint32_t error_count_ = 0;
-  uint32_t last_log_time_ = 0;
 };
diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index f35ad68..f873439 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -46,6 +46,8 @@ constexpr int kToneChannel = 1;
 stackchan_websocket_v1_WebSocketMessage g_tx_message = stackchan_websocket_v1_WebSocketMessage_init_zero;
 stackchan_websocket_v1_WebSocketMessage g_rx_message = stackchan_websocket_v1_WebSocketMessage_init_zero;
 bool g_tone_playing = false;
+bool g_tone_restore_state_pending = false;
+StateMachine::State g_tone_restore_state = StateMachine::Idle;
 
 void markCommunicationActive()
 {
@@ -269,8 +271,25 @@ bool applyToneCommand(const stackchan_websocket_v1_ToneCommand &command)
     return false;
   }
 
+  StateMachine::State previous_state = stateMachine.getState();
+  if (previous_state != StateMachine::Speaking)
+  {
+    g_tone_restore_state = previous_state;
+    g_tone_restore_state_pending = true;
+    stateMachine.setState(StateMachine::Speaking);
+  }
+  else
+  {
+    g_tone_restore_state_pending = false;
+  }
+
   if (!M5.Speaker.tone(command.frequency, command.duration_ms, kToneChannel, true))
   {
+    if (g_tone_restore_state_pending)
+    {
+      stateMachine.setState(g_tone_restore_state);
+      g_tone_restore_state_pending = false;
+    }
     log_w(
         "Failed to start tone frequency=%.1f duration=%lu",
         command.frequency,
@@ -279,10 +298,6 @@ bool applyToneCommand(const stackchan_websocket_v1_ToneCommand &command)
   }
 
   g_tone_playing = true;
-  log_i(
-      "ToneCmd frequency=%.1f duration=%lu",
-      command.frequency,
-      static_cast<unsigned long>(command.duration_ms));
   return true;
 }
 
@@ -299,6 +314,11 @@ void pollTonePlayback()
   }
 
   g_tone_playing = false;
+  if (g_tone_restore_state_pending)
+  {
+    stateMachine.setState(g_tone_restore_state);
+    g_tone_restore_state_pending = false;
+  }
   notifyToneDone();
 }
 } // namespace
diff --git a/firmware/src/speaking.cpp b/firmware/src/speaking.cpp
index c1bb8d9..51cc1e8 100644
--- a/firmware/src/speaking.cpp
+++ b/firmware/src/speaking.cpp
@@ -23,7 +23,17 @@ void Speaking::init()
 void Speaking::begin()
 {
   // 念のためマイクを停止し、再生に集中させる
+  uint8_t current_volume = M5.Speaker.getVolume();
   M5.Mic.end();
+  delay(20);
+  M5.Speaker.end();
+  delay(10);
+  bool speaker_ready = M5.Speaker.begin();
+  M5.Speaker.setVolume(current_volume);
+  if (!speaker_ready)
+  {
+    log_w("Failed to initialize speaker");
+  }
 }
 
 void Speaking::end()
@@ -32,7 +42,6 @@ void Speaking::end()
   {
     M5.Speaker.stop();
   }
-  M5.Speaker.end();
   reset();
 }
 
@@ -106,7 +115,12 @@ void Speaking::handleWavEnd(uint32_t seq)
     const int16_t *samples = reinterpret_cast<const int16_t *>(buf.data());
     size_t sample_len = buf.size() / sizeof(int16_t);
     bool stereo = channels_ > 1;
-    M5.Speaker.playRaw(samples, sample_len, sample_rate_, stereo, 1, 0);
+    bool accepted = M5.Speaker.playRaw(samples, sample_len, sample_rate_, stereo, 1, 0);
+    if (!accepted)
+    {
+      log_w("Failed to queue raw audio for playback");
+      playing_ = false;
+    }
   }
 }
 
diff --git a/firmware/src/wake_up_word.cpp b/firmware/src/wake_up_word.cpp
index 426ab7b..39bd006 100644
--- a/firmware/src/wake_up_word.cpp
+++ b/firmware/src/wake_up_word.cpp
@@ -26,8 +26,10 @@ void WakeUpWord::begin()
 
 void WakeUpWord::end()
 {
-  M5.Mic.end();
   ESP_SR_M5.pause();
+  delay(10);
+  M5.Mic.end();
+  delay(20);
 }
 
 void WakeUpWord::feedAudio(const int16_t *samples, size_t count)
@@ -49,31 +51,6 @@ void WakeUpWord::loop()
   if (success)
   {
     feedAudio(audio_buf, kAudioSampleSize);
-
-    uint32_t now = millis();
-    if (now - last_log_time_ >= 1000)
-    {
-      int32_t sum = 0;
-      for (int i = 0; i < 10; i++)
-      {
-        sum += abs(audio_buf[i]);
-      }
-      log_i("idle loop: count=%lu, avg_level=%ld, errors=%lu, interval=%lu ms",
-            static_cast<unsigned long>(loop_count_),
-            static_cast<long>(sum / 10),
-            static_cast<unsigned long>(error_count_),
-            static_cast<unsigned long>(now - last_log_time_));
-      last_log_time_ = now;
-    }
-    loop_count_++;
-  }
-  else
-  {
-    error_count_++;
-    if (error_count_ % 100 == 0)
-    {
-      log_w("WARNING: M5.Mic.record failed, count=%lu", static_cast<unsigned long>(error_count_));
-    }
   }
 }
 
diff --git a/stackchan_server/ws_proxy.py b/stackchan_server/ws_proxy.py
index cb1a6c0..c2f8abb 100644
--- a/stackchan_server/ws_proxy.py
+++ b/stackchan_server/ws_proxy.py
@@ -227,11 +227,13 @@ async def tone(
         )
 
     async def listen_raw(self, duration: int = 3000) -> bytes:
-        return await self._listener.listen_raw(
+        raw_audio = await self._listener.listen_raw(
             duration_ms=duration,
             send_listen_command=self._send_listen_command,
             is_closed=lambda: self._closed,
         )
+        await self._wait_for_listening_finished(timeout_seconds=max(duration / 1000.0 + 2.0, 5.0))
+        return raw_audio
 
     async def send_state_command(self, state_id: int | FirmwareState) -> None:
         await self._send_state_command(state_id)
@@ -517,6 +519,22 @@ async def _wait_for_counter(
                 raise TimeoutError(f"Timed out waiting for {label}")
             await asyncio.sleep(0.05)
 
+    async def _wait_for_listening_finished(
+        self,
+        *,
+        timeout_seconds: float | None,
+    ) -> None:
+        loop = asyncio.get_running_loop()
+        deadline = (loop.time() + timeout_seconds) if timeout_seconds else None
+        while True:
+            if self._current_firmware_state != FirmwareState.LISTENING:
+                return
+            if self._closed:
+                raise WebSocketDisconnect()
+            if deadline and loop.time() >= deadline:
+                raise TimeoutError("Timed out waiting for firmware to leave listening state")
+            await asyncio.sleep(0.05)
+
     def _next_down_seq(self) -> int:
         seq = self._down_seq
         self._down_seq += 1

From 03a18a0ecb89e562a856412ea118f1f14ca3b37f Mon Sep 17 00:00:00 2001
From: Atsushi Morimoto <74th.tech@gmail.com>
Date: Sun, 19 Apr 2026 20:26:56 +0900
Subject: [PATCH 4/4] Refactor code structure for improved readability and
 maintainability

---
 example_apps/record_wakeup_word.py |  38 +++--
 pyproject.toml                     |   1 +
 uv.lock                            | 252 +++++++++++++++++++++++++++++
 3 files changed, 278 insertions(+), 13 deletions(-)

diff --git a/example_apps/record_wakeup_word.py b/example_apps/record_wakeup_word.py
index b23bb5b..fb3f0bf 100644
--- a/example_apps/record_wakeup_word.py
+++ b/example_apps/record_wakeup_word.py
@@ -47,28 +47,40 @@ async def talk_session(proxy: WsProxy):
 
 @app.webapi("/record_wakeup_word")
 async def record_wakeup_word(proxy: WsProxy, args: dict):
-    duration_ms = int(args.get("duration_ms", args.get("duration", 3000)))
+    duration_ms = 2500
     logger.info("Recording wakeup word duration_ms=%d", duration_ms)
     await proxy.speak(
         "これからウェイクアップワードの録音を開始します。ピッと鳴ったら、ウェイクアップワードを話してください。"
     )
-    await proxy.tone(4000, 200)
-    raw_audio = await proxy.listen_raw(duration=duration_ms)
-    await asyncio.sleep(0.5)
-    await proxy.tone(1000, 200)
+    await proxy.speak(
+        "50回録音します。トーンを変えたり、ちょっと遠くから話したりして、いろいろなパターンを録音してください。"
+    )
 
     output_dir = Path("tmp")
     output_dir.mkdir(parents=True, exist_ok=True)
-    filename = f"wakeup_word_{datetime.now(UTC).strftime('%Y%m%d_%H%M%S_%f')}.wav"
-    filepath = output_dir / filename
 
-    with wave.open(str(filepath), "wb") as wav_fp:
-        wav_fp.setnchannels(LISTEN_AUDIO_FORMAT.channels)
-        wav_fp.setsampwidth(LISTEN_AUDIO_FORMAT.sample_width)
-        wav_fp.setframerate(LISTEN_AUDIO_FORMAT.sample_rate_hz)
-        wav_fp.writeframes(raw_audio)
+    for i in range(50):
+        if i > 0 and i % 10 == 0:
+            await proxy.speak(f"あと{50 - i}回")
+
+        await proxy.tone(2000, 200)
+        raw_audio = await proxy.listen_raw(duration=duration_ms)
+
+        filename = f"wakeup_word_{datetime.now(UTC).strftime('%Y%m%d_%H%M%S_%f')}.wav"
+        filepath = output_dir / filename
+
+        with wave.open(str(filepath), "wb") as wav_fp:
+            wav_fp.setnchannels(LISTEN_AUDIO_FORMAT.channels)
+            wav_fp.setsampwidth(LISTEN_AUDIO_FORMAT.sample_width)
+            wav_fp.setframerate(LISTEN_AUDIO_FORMAT.sample_rate_hz)
+            wav_fp.writeframes(raw_audio)
+
+        logger.info("Saved wakeup word recording to %s", filepath)
+
+    await proxy.speak(
+        "お疲れ様でした"
+    )
 
-    logger.info("Saved wakeup word recording to %s", filepath)
     return {
         "path": str(filepath),
         "bytes": len(raw_audio),
diff --git a/pyproject.toml b/pyproject.toml
index 90638f2..5c60d80 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,6 +17,7 @@ dependencies = [
     "python-dotenv>=1.2.1",
     "pydantic-settings>=2.13.1",
     "protobuf>=6.33.3",
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