fix: online metric

services/mqttaccess/mqtt_provider.go

@@ -28,6 +28,7 @@ func (mp *MQTTProvider) ValidateDeviceToken(deviceid string, token []byte) error
 	return nil
 }
 func (mp *MQTTProvider) OnDeviceOnline(args rpcs.ArgsGetOnline, VendorId string) error {
+	deviceOnlineCount.Inc()
 	reply := rpcs.ReplyGetOnline{}
 	err := server.RPCCallByName(nil, rpcs.DeviceManagerName, "DeviceManager.GetOnline", args, &reply)
 	if err != nil {
@@ -40,10 +41,11 @@ func (mp *MQTTProvider) OnDeviceOnline(args rpcs.ArgsGetOnline, VendorId string)
 	if err = server.RPCCallByName(nil, rpcs.ControllerName, "Controller.Online", &cArgs, &cReply); err != nil {
 		return err
 	}
-	deviceOnlineCount.Inc()
+
 	return err
 }
 func (mp *MQTTProvider) OnDeviceOffline(deviceid string, vendorId string) error {
+	deviceOnlineCount.Dec()
 	args := rpcs.ArgsGetOffline{
 		Id:       deviceid,
 		VendorId: vendorId,
@@ -60,7 +62,7 @@ func (mp *MQTTProvider) OnDeviceOffline(deviceid string, vendorId string) error
 	if err = server.RPCCallByName(nil, rpcs.ControllerName, "Controller.Offline", &cArgs, &cReply); err != nil {
 		return err
 	}
-	deviceOnlineCount.Dec()
+
 	return err
 }
 func (mp *MQTTProvider) OnDeviceHeartBeat(deviceid string) error {