diff --git a/dto/mqtt.pb.go b/dto/mqtt.pb.go
index db01345..125ab5f 100644
--- a/dto/mqtt.pb.go
+++ b/dto/mqtt.pb.go
@@ -23,22 +23,19 @@ const (
 type ServiceState int32
 
 const (
-	ServiceState_Normal  ServiceState = 0 // 正常
-	ServiceState_Offline ServiceState = 1 // 离线
-	ServiceState_Error   ServiceState = 2 // 异常
+	ServiceState_Normal ServiceState = 0 // 正常
+	ServiceState_Error  ServiceState = 2 // 错误
 )
 
 // Enum value maps for ServiceState.
 var (
 	ServiceState_name = map[int32]string{
 		0: "Normal",
-		1: "Offline",
 		2: "Error",
 	}
 	ServiceState_value = map[string]int32{
-		"Normal":  0,
-		"Offline": 1,
-		"Error":   2,
+		"Normal": 0,
+		"Error":  2,
 	}
 )
 
@@ -76,7 +73,8 @@ type IotServiceState struct {
 	unknownFields protoimpl.UnknownFields
 
 	// string cliId = 1; // IOT服务mqtt客户端id
-	State ServiceState `protobuf:"varint,2,opt,name=state,proto3,enum=iot_dto.ServiceState" json:"state,omitempty"` // 服务状态
+	State  ServiceState `protobuf:"varint,2,opt,name=state,proto3,enum=iot_dto.ServiceState" json:"state,omitempty"` // 服务状态
+	ErrMsg string       `protobuf:"bytes,3,opt,name=errMsg,proto3" json:"errMsg,omitempty"`                          // 当state为error时，错误描述
 }
 
 func (x *IotServiceState) Reset() {
@@ -118,6 +116,13 @@ func (x *IotServiceState) GetState() ServiceState {
 	return ServiceState_Normal
 }
 
+func (x *IotServiceState) GetErrMsg() string {
+	if x != nil {
+		return x.ErrMsg
+	}
+	return ""
+}
+
 type IotQcServiceStartReq struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -470,35 +475,36 @@ var file_proto_src_mqtt_proto_rawDesc = []byte{
 	0x0a, 0x14, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x73, 0x72, 0x63, 0x2f, 0x6d, 0x71, 0x74, 0x74,
 	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x07, 0x69, 0x6f, 0x74, 0x5f, 0x64, 0x74, 0x6f, 0x1a,
 	0x12, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x73, 0x72, 0x63, 0x2f, 0x64, 0x63, 0x2e, 0x70, 0x72,
-	0x6f, 0x74, 0x6f, 0x22, 0x3e, 0x0a, 0x0f, 0x49, 0x6f, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63,
+	0x6f, 0x74, 0x6f, 0x22, 0x56, 0x0a, 0x0f, 0x49, 0x6f, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63,
 	0x65, 0x53, 0x74, 0x61, 0x74, 0x65, 0x12, 0x2b, 0x0a, 0x05, 0x73, 0x74, 0x61, 0x74, 0x65, 0x18,
 	0x02, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x15, 0x2e, 0x69, 0x6f, 0x74, 0x5f, 0x64, 0x74, 0x6f, 0x2e,
 	0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x53, 0x74, 0x61, 0x74, 0x65, 0x52, 0x05, 0x73, 0x74,
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-	0x69, 0x63, 0x65, 0x53, 0x74, 0x61, 0x72, 0x74, 0x52, 0x65, 0x71, 0x12, 0x2d, 0x0a, 0x06, 0x63,
-	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x15, 0x2e, 0x69, 0x6f,
-	0x74, 0x5f, 0x64, 0x74, 0x6f, 0x2e, 0x4d, 0x6f, 0x64, 0x62, 0x75, 0x73, 0x43, 0x6f, 0x6e, 0x66,
-	0x69, 0x67, 0x52, 0x06, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x14, 0x0a, 0x05, 0x66, 0x6f,
-	0x72, 0x63, 0x65, 0x18, 0x05, 0x20, 0x01, 0x28, 0x08, 0x52, 0x05, 0x66, 0x6f, 0x72, 0x63, 0x65,
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+	0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x04, 0x63, 0x6f, 0x64, 0x65, 0x12, 0x10, 0x0a,
+	0x03, 0x6d, 0x73, 0x67, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6d, 0x73, 0x67, 0x22,
+	0x28, 0x0a, 0x10, 0x49, 0x6f, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x4c, 0x6f, 0x67,
+	0x52, 0x65, 0x71, 0x12, 0x14, 0x0a, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x03, 0x20, 0x01,
+	0x28, 0x05, 0x52, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x22, 0x27, 0x0a, 0x11, 0x49, 0x6f, 0x74,
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+	0x0a, 0x04, 0x6c, 0x6f, 0x67, 0x73, 0x18, 0x04, 0x20, 0x03, 0x28, 0x09, 0x52, 0x04, 0x6c, 0x6f,
+	0x67, 0x73, 0x22, 0x1b, 0x0a, 0x05, 0x49, 0x6f, 0x74, 0x51, 0x64, 0x12, 0x12, 0x0a, 0x04, 0x64,
+	0x61, 0x74, 0x61, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61, 0x22,
+	0x1b, 0x0a, 0x05, 0x49, 0x6f, 0x74, 0x43, 0x6a, 0x12, 0x12, 0x0a, 0x04, 0x64, 0x61, 0x74, 0x61,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61, 0x2a, 0x25, 0x0a, 0x0c,
+	0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x53, 0x74, 0x61, 0x74, 0x65, 0x12, 0x0a, 0x0a, 0x06,
+	0x4e, 0x6f, 0x72, 0x6d, 0x61, 0x6c, 0x10, 0x00, 0x12, 0x09, 0x0a, 0x05, 0x45, 0x72, 0x72, 0x6f,
+	0x72, 0x10, 0x02, 0x42, 0x07, 0x5a, 0x05, 0x2e, 0x2f, 0x64, 0x74, 0x6f, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/mqtt/client.go b/mqtt/client.go
index 44b02ba..cebbbd1 100644
--- a/mqtt/client.go
+++ b/mqtt/client.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log/slog"
+	"time"
 
 	"github.com/eclipse/paho.golang/autopaho"
 	"github.com/eclipse/paho.golang/paho"
@@ -42,6 +43,15 @@ func Start(cmc *IotMqttConfig) error {
 	return nil
 }
 
+// 断开MQTT客户端
+func Stop() error {
+	slog.Info("停止MQTT客户端")
+	ctx, cancle := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancle()
+	err := iotcli.cm.Disconnect(ctx)
+	return err
+}
+
 func checkConfig(cmc *IotMqttConfig) error {
 	if cmc.AppId == "" {
 		return fmt.Errorf("应用编号不能为空")
diff --git a/mqtt/client_request_test.go b/mqtt/client_request_test.go
index 69a7df9..59277a4 100644
--- a/mqtt/client_request_test.go
+++ b/mqtt/client_request_test.go
@@ -61,7 +61,7 @@ func TestRequest(t *testing.T) {
 
 	fmt.Printf("请求结果: %v\n", resp)
 	lr := &dto.IotServiceLogResp{}
-	err = proto.Unmarshal(resp.Payload, lr)
+	_ = proto.Unmarshal(resp.Payload, lr)
 	log.Printf("Received response: %s\n", lr)
 
 	time.Sleep(3 * time.Second)
@@ -111,7 +111,7 @@ func listen() {
 	v.Wait()
 }
 
-func getCmConfig(clientId, logReqTopic string) autopaho.ClientConfig {
+func getCmConfig(clientId, subTopic string) autopaho.ClientConfig {
 	addr, _ := url.Parse("tcp://192.168.3.233:1883")
 	cc := autopaho.ClientConfig{
 		BrokerUrls: []*url.URL{addr},
@@ -122,7 +122,7 @@ func getCmConfig(clientId, logReqTopic string) autopaho.ClientConfig {
 			defer cancel()
 			if _, err := cm.Subscribe(ctx, &paho.Subscribe{
 				Subscriptions: []paho.SubscribeOptions{
-					{Topic: logReqTopic, QoS: 0},
+					{Topic: subTopic, QoS: 0},
 				},
 			}); err != nil {
 				fmt.Printf("failed to subscribe (%s). This is likely to mean no messages will be received.", err)
diff --git a/mqtt/client_will_test.go b/mqtt/client_will_test.go
deleted file mode 100644
index 13dccfb..0000000
--- a/mqtt/client_will_test.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package mqtt
-
-import "testing"
-
-func TestWillMessage(t *testing.T) {
-	t.Log("test will message")
-}
diff --git a/mqtt/config.go b/mqtt/config.go
index 7800943..b86830a 100644
--- a/mqtt/config.go
+++ b/mqtt/config.go
@@ -59,6 +59,5 @@ func (c *IotMqttConfig) tryInto() (*autopaho.ClientConfig, error) {
 		},
 	}
 	cc.SetUsernamePassword(c.Username, []byte(c.Password))
-	cc.SetWillMessage(GetIotServiceStateTopic(), []byte("离线"), 1, true)
 	return cc, nil
 }
diff --git a/proto/src/mqtt.proto b/proto/src/mqtt.proto
index 25e11cb..0ada4ad 100644
--- a/proto/src/mqtt.proto
+++ b/proto/src/mqtt.proto
@@ -7,14 +7,14 @@ import "proto/src/dc.proto";
 
 enum ServiceState {
     Normal = 0; // 正常
-    Offline = 1; // 离线
-    Error = 2; // 异常
+    Error = 2; // 出现异常或发生错误
 }
 
 // IOT服务状态
 message IotServiceState {
     // string cliId = 1; // IOT服务mqtt客户端id
     ServiceState state = 2; // 服务状态
+    string errMsg = 3; // 当state为error时,异常/错误描述
 }
 
 message IotQcServiceStartReq {
@@ -24,7 +24,7 @@ message IotQcServiceStartReq {
 }
 
 message IotQcServiceStopReq {
-    
+
 }
 
 message IotQcServiceCommonResp {
diff --git a/server/server.go b/server/server.go
index 679047f..6ad5780 100644
--- a/server/server.go
+++ b/server/server.go
@@ -16,6 +16,7 @@ var iqcs *IotQcServer
 type IotQcServer struct {
 	qcMappingService service.IotQcMappingService
 	tasks            []service.IScheduledTask
+	state            *dto.IotServiceState
 }
 
 func (s *IotQcServer) start() error {
@@ -27,6 +28,21 @@ func (s *IotQcServer) start() error {
 	return nil
 }
 
+func (s *IotQcServer) stateMonitor() *dto.IotServiceState {
+	if s.qcMappingService != nil {
+		if err := s.qcMappingService.ReportError(); err != nil {
+			// slog.Error("Modbus驱采映射服务报错", "err", err)
+			return &dto.IotServiceState{
+				State:  dto.ServiceState_Error,
+				ErrMsg: err.Error(),
+			}
+		}
+	}
+	return &dto.IotServiceState{
+		State: dto.ServiceState_Normal,
+	}
+}
+
 func (s *IotQcServer) registerReqHandlers() {
 	mqtt.RegIotQcServiceStartReqHandler(s.startIotQcMappingService)
 	mqtt.RegIotQcServiceStopReqHandler(s.stopIotQcMappingService)
@@ -54,15 +70,16 @@ func (s *IotQcServer) stopIotQcMappingService(req *dto.IotQcServiceStopReq) *dto
 func StartIotQcServer() {
 	iqcs = &IotQcServer{
 		tasks: []service.IScheduledTask{},
+		state: &dto.IotServiceState{
+			State: dto.ServiceState_Normal,
+		},
 	}
 	iqcs.start()
 }
 
 func pubServerState() {
-	state := dto.ServiceState_Normal
-	mqtt.PubIotServiceState(&dto.IotServiceState{
-		State: state,
-	})
+	state := iqcs.stateMonitor()
+	mqtt.PubIotServiceState(state)
 }
 
 func startMqttClient() {
diff --git a/service/api.go b/service/api.go
index 18647ec..495b559 100644
--- a/service/api.go
+++ b/service/api.go
@@ -22,6 +22,8 @@ type IotQcMappingService interface {
 	WriteQdBytes(bytes []byte) error
 	// 写采集位列表
 	WriteCjBytes(bytes []byte) error
+	// 报错
+	ReportError() error
 }
 
 // 定时任务
diff --git a/service/modbus_qc_mapping.go b/service/modbus_qc_mapping.go
index d87d986..595dd2e 100644
--- a/service/modbus_qc_mapping.go
+++ b/service/modbus_qc_mapping.go
@@ -19,8 +19,14 @@ type modbusQcService struct {
 	qc      model.QC
 	tasks   []IScheduledTask
 	stopped bool
-	// cancel context.CancelFunc
-	// done   chan struct{} // 服务协程退出信号
+}
+
+// ReportError implements IotQcMappingService.
+func (s *modbusQcService) ReportError() error {
+	if !s.cli.IsConnected() {
+		return fmt.Errorf("modbus连接断开")
+	}
+	return nil
 }
 
 // RegisterQcDataHandleScheduleTask implements IotQcMappingService.
@@ -119,13 +125,8 @@ func NewModbusQcService(config *dto.ModbusConfig) (IotQcMappingService, error) {
 		config: config,
 		cli:    cli,
 		qc:     model.NewDC(qd, cj),
-		// done:   make(chan struct{}),
 	}
 	s.RegisterQcDataHandleScheduleTask(s.readTaskExecute, time.Duration(config.Interval)*time.Millisecond)
-	// s.initOnUpdateTask()
-	// ctx, cancel := context.WithCancel(context.Background())
-	// go s.run(ctx)
-	// s.cancel = cancel
 	return s, nil
 }