diff --git a/backend/state-manager/cmd/main.go b/backend/state-manager/cmd/main.go
index 13b5e3c..b38ba5d 100644
--- a/backend/state-manager/cmd/main.go
+++ b/backend/state-manager/cmd/main.go
@@ -10,7 +10,6 @@ import (
 	"os/signal"
 	"time"
 
-	mqtt "github.com/eclipse/paho.mqtt.golang"
 	mqtt "github.com/eclipse/paho.mqtt.golang"
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
@@ -19,10 +18,8 @@ import (
 	"github.com/ueckoken/plarail2023/backend/spec/state/v1/statev1connect"
 	connectHandler "github.com/ueckoken/plarail2023/backend/state-manager/pkg/connect"
 	"github.com/ueckoken/plarail2023/backend/state-manager/pkg/db"
-	"github.com/ueckoken/plarail2023/backend/state-manager/pkg/db"
 	"github.com/ueckoken/plarail2023/backend/state-manager/pkg/mqtt_handler"
 	"go.mongodb.org/mongo-driver/mongo/options"
-	"go.mongodb.org/mongo-driver/mongo/options"
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/h2c"
 	"golang.org/x/sync/errgroup"
@@ -95,7 +92,6 @@ func main() {
 	go func() {
 		<-ctx.Done()
 		slog.Default().Info("signal received or canceled")
-		slog.Default().Info("signal received or canceled")
 	}()
 
 	eg, ctx := errgroup.WithContext(ctx)
@@ -124,36 +120,11 @@ func main() {
 		return mqttHandler.Start(ctx)
 	})
 
-	DBOpts := options.Client().ApplyURI(os.Getenv("MONGODB_URI"))
-	DBHandler, err := db.Open(ctx, DBOpts)
-	if err != nil {
-		slog.Default().Error("database connection failed", slog.Any("err", err))
-		cancel()
-		return
-	}
-	mqttClientOpts := mqtt.NewClientOptions()
-	mqttClientOpts.AddBroker(os.Getenv("MQTT_BROKER_ADDR"))
-	mqttClientOpts.Username = os.Getenv("MQTT_USERNAME")
-	mqttClientOpts.Password = os.Getenv("MQTT_PASSWORD")
-	mqttClientOpts.ClientID = os.Getenv("MQTT_CLIENT_ID")
-
-	mqttHandler, err := mqtt_handler.NewHandler(mqttClientOpts, DBHandler)
-	if err != nil {
-		slog.Default().Error("mqtt create client or handler failed,", slog.Any("err", err))
-		cancel()
-		return
-	}
-	eg.Go(func() error {
-		slog.Default().Info("start mqtt handler")
-		return mqttHandler.Start(ctx)
-	})
-
 	r := chi.NewRouter()
 	// r.Use(middleware.Recoverer)
 	r.Use(middleware.Heartbeat("/debug/ping"))
 	r.Mount("/debug", middleware.Profiler())
 	r.Handle(statev1connect.NewStateManagerServiceHandler(&connectHandler.StateManagerServer{DBHandler: DBHandler, MqttHandler: mqttHandler}))
-	r.Handle(statev1connect.NewStateManagerServiceHandler(&connectHandler.StateManagerServer{DBHandler: DBHandler, MqttHandler: mqttHandler}))
 	r.Use(httplog.RequestLogger(
 		httplog.NewLogger(
 			"http_server",
@@ -171,8 +142,6 @@ func main() {
 		),
 	),
 	)
-	r.Mount("/debug", middleware.Profiler())
-	r.Handle(statev1connect.NewStateManagerServiceHandler(&connectHandler.StateManagerServer{}))
 
 	srv := &http.Server{
 		Addr:              net.JoinHostPort("0.0.0.0", "8080"),
@@ -180,6 +149,7 @@ func main() {
 		ReadHeaderTimeout: 60 * time.Second,
 		BaseContext:       func(net.Listener) context.Context { return ctx },
 	}
+
 	eg.Go(func() error {
 		errC := make(chan error)
 		go func() {
@@ -197,6 +167,7 @@ func main() {
 			return ctx.Err()
 		}
 	})
+
 	//go operation.Handler()
 	eg.Go(func() error {
 		slog.Default().Info("start mqtt handler")
diff --git a/backend/state-manager/pkg/mqtt_handler/mqtt_handler.go b/backend/state-manager/pkg/mqtt_handler/mqtt_handler.go
index 84b6918..513dfd6 100644
--- a/backend/state-manager/pkg/mqtt_handler/mqtt_handler.go
+++ b/backend/state-manager/pkg/mqtt_handler/mqtt_handler.go
@@ -45,7 +45,7 @@ func (h *Handler) Start(ctx context.Context) error {
 			slog.Default().Info("Interrupted at mqtt_handler")
 			h.client.Disconnect(1000)
 			slog.Default().Info("Disconnected from mqtt broker")
-			return nil
+			return fmt.Errorf("interrupted at mqtt_handler: %w", ctx.Err())
 		}
 	}
 }