diff --git a/stackchan_server/app.py b/stackchan_server/app.py
index 46a3006..03d6933 100644
--- a/stackchan_server/app.py
+++ b/stackchan_server/app.py
@@ -4,7 +4,8 @@
 from logging import getLogger
 from typing import Awaitable, Callable, Optional
 
-from fastapi import FastAPI, WebSocket, WebSocketDisconnect
+from fastapi import FastAPI, HTTPException, WebSocket, WebSocketDisconnect
+from pydantic import BaseModel
 
 from .speech_recognition import create_speech_recognizer
 from .speech_synthesis import create_speech_synthesizer
@@ -14,6 +15,15 @@
 logger = getLogger(__name__)
 
 
+class StackChanInfo(BaseModel):
+    ip: str
+    state: str
+
+
+class SpeakRequest(BaseModel):
+    text: str
+
+
 class StackChanApp:
     def __init__(
         self,
@@ -25,6 +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._proxies: dict[str, WsProxy] = {}
 
         @self.fastapi.get("/health")
         async def _health() -> dict[str, str]:
@@ -34,6 +45,34 @@ async def _health() -> dict[str, str]:
         async def _ws_audio(websocket: WebSocket):
             await self._handle_ws(websocket)
 
+        @self.fastapi.get("/v1/stackchan", response_model=list[StackChanInfo])
+        async def _list_stackchans():
+            return [
+                StackChanInfo(ip=ip, state=proxy.current_state.name.lower())
+                for ip, proxy in self._proxies.items()
+            ]
+
+        @self.fastapi.get("/v1/stackchan/{stackchan_ip}", response_model=StackChanInfo)
+        async def _get_stackchan(stackchan_ip: str):
+            proxy = self._proxies.get(stackchan_ip)
+            if proxy is None:
+                raise HTTPException(status_code=404, detail="stackchan not connected")
+            return StackChanInfo(ip=stackchan_ip, state=proxy.current_state.name.lower())
+
+        @self.fastapi.post("/v1/stackchan/{stackchan_ip}/wakeword", status_code=204)
+        async def _trigger_wakeword(stackchan_ip: str):
+            proxy = self._proxies.get(stackchan_ip)
+            if proxy is None:
+                raise HTTPException(status_code=404, detail="stackchan not connected")
+            proxy.trigger_wakeword()
+
+        @self.fastapi.post("/v1/stackchan/{stackchan_ip}/speak", status_code=204)
+        async def _speak(stackchan_ip: str, body: SpeakRequest):
+            proxy = self._proxies.get(stackchan_ip)
+            if proxy is None:
+                raise HTTPException(status_code=404, detail="stackchan not connected")
+            await proxy.speak(body.text)
+
     def setup(self, fn: Callable[["WsProxy"], Awaitable[None]]):
         self._setup_fn = fn
         return fn
@@ -44,11 +83,21 @@ def talk_session(self, fn: Callable[["WsProxy"], Awaitable[None]]):
 
     async def _handle_ws(self, websocket: WebSocket) -> None:
         await websocket.accept()
+        client_ip = websocket.client.host if websocket.client else "unknown"
+
+        # 同一 IP からの既存接続があれば切断する
+        existing = self._proxies.get(client_ip)
+        if existing is not None:
+            logger.info("Duplicate connection from %s, closing old one", client_ip)
+            await existing.close()
+            self._proxies.pop(client_ip, None)
+
         proxy = WsProxy(
             websocket,
             speech_recognizer=self.speech_recognizer,
             speech_synthesizer=self.speech_synthesizer,
         )
+        self._proxies[client_ip] = proxy
         await proxy.start()
         try:
             if self._setup_fn:
@@ -82,6 +131,7 @@ async def _handle_ws(self, websocket: WebSocket) -> None:
             pass
         finally:
             await proxy.close()
+            self._proxies.pop(client_ip, None)
 
     def run(self, host: str = "0.0.0.0", port: int = 8000, reload: bool = True) -> None:
         import uvicorn
diff --git a/stackchan_server/ws_proxy.py b/stackchan_server/ws_proxy.py
index 1b9bd3b..5541b54 100644
--- a/stackchan_server/ws_proxy.py
+++ b/stackchan_server/ws_proxy.py
@@ -100,15 +100,25 @@ def __init__(
         self._closed = False
 
         self._down_seq = 0
+        self._current_firmware_state: FirmwareState = FirmwareState.IDLE
 
     @property
     def closed(self) -> bool:
         return self._closed
 
+    @property
+    def current_state(self) -> FirmwareState:
+        return self._current_firmware_state
+
     @property
     def receive_task(self) -> Optional[asyncio.Task]:
         return self._receiving_task
 
+    def trigger_wakeword(self) -> None:
+        """Web API から擬似的に WAKEWORD_EVT を発火させる。"""
+        logger.info("Triggered wakeword via API")
+        self._wakeword_event.set()
+
     async def wait_for_talk_session(self) -> None:
         while True:
             if self._wakeword_event.is_set():
@@ -232,6 +242,7 @@ def _handle_state_event(self, msg_type: int, payload: bytes) -> None:
         raw_state = int(payload[0])
         try:
             state = FirmwareState(raw_state)
+            self._current_firmware_state = state
             logger.info("Received firmware state=%s(%d)", state.name, raw_state)
         except ValueError:
             logger.info("Received firmware state=%d", raw_state)