在Android应用程序中，可以使用OkHttp库来创建并管理Websocket连接，并将其封装在Service中以确保连接的稳定性。以下是一个示例代码：

public class WebSocketService extends Service {
    private static final String TAG = WebSocketService.class.getSimpleName();
    private static final String WS_URL = "ws://iot-device-url"; // IOT设备的Websocket URL
    private static final int NORMAL_CLOSURE_STATUS = 1000;

    private WebSocket webSocket;

    @Override
    public void onCreate() {
        super.onCreate();
        connectWebSocket();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        disconnectWebSocket();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null; // 不需要绑定到Activity
    }

    private void connectWebSocket() {
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder().url(WS_URL).build();
        webSocket = client.newWebSocket(request, new WebSocketListener() {
            @Override
            public void onOpen(WebSocket webSocket, Response response) {
                Log.d(TAG, "WebSocket连接成功");
            }

            @Override
            public void onMessage(WebSocket webSocket, String text) {
                Log.d(TAG, "收到消息：" + text);
            }

            @Override
            public void onClosing(WebSocket webSocket, int code, String reason) {
                webSocket.close(NORMAL_CLOSURE_STATUS, null);
                Log.d(TAG, "WebSocket即将关闭");
            }

            @Override
            public void onClosed(WebSocket webSocket, int code, String reason) {
                Log.d(TAG, "WebSocket已关闭");
            }

            @Override
            public void onFailure(WebSocket webSocket, Throwable t, Response response) {
                Log.e(TAG, "WebSocket连接失败：" + t.getMessage());
                // 尝试重新连接
                connectWebSocket();
            }
        });
    }

    private void disconnectWebSocket() {
        if (webSocket != null) {
            webSocket.close(NORMAL_CLOSURE_STATUS, "Service被销毁");
        }
    }