diff --git a/src/bluetooth-extension/index.ts b/src/bluetooth-extension/index.ts
index dc3170f..684a774 100644
--- a/src/bluetooth-extension/index.ts
+++ b/src/bluetooth-extension/index.ts
@@ -16,7 +16,7 @@ import {
 export namespace CommandIDs {
   export const openDeviceRegistryDialog =
     'bluetooth-manager:open-dialog-for-devices-registry';
-  export const disconnectDevice = 'bluetooth-manager:disconnect-device';
+  export const disconnect = 'bluetooth-manager:disconnect-device';
 }
 
 export function buildCompleteIdentifier(native: BluetoothDevice): string {
@@ -67,13 +67,13 @@ const BluetoothSidebarPlugin: JupyterFrontEndPlugin<void> = {
     const openDeviceRegistryDialogLabel = trans.__('Add a Device');
     let runningItemsList: Array<IRunningSessions.IRunningItem>;
 
-    app.commands.addCommand(CommandIDs.disconnectDevice, {
+    app.commands.addCommand(CommandIDs.disconnect, {
       execute: args => {
         const selectedDevice = bluetoothManager.deviceList.find(
           device => device.native.id === (args.deviceID as string)
         );
         if (selectedDevice) {
-          bluetoothManager.disconnectDevice(selectedDevice);
+          bluetoothManager.disconnect(selectedDevice);
           return selectedDevice;
         } else {
           throw new Error('No device provided or device is invalid');
@@ -87,20 +87,24 @@ const BluetoothSidebarPlugin: JupyterFrontEndPlugin<void> = {
       execute: async () => {
         showDialog({
           title: 'Select device type',
-          body: new DropDownRegistry(bluetoothManager.registry),
+          body: new DropDownRegistry(bluetoothManager.deviceTypeRegistry),
           buttons: [
             Dialog.okButton({ label: 'Select' }),
             Dialog.cancelButton({ label: 'Cancel' })
           ]
         }).then(async result => {
           if (result.button.accept) {
-            bluetoothManager.registry.itemsList.forEach(async item => {
-              if (item.deviceType === result.value) {
-                await bluetoothManager.connectDevice(item);
-              } else {
-                console.warn('There is no corresponding item in the registry!');
+            bluetoothManager.deviceTypeRegistry.deviceTypes.forEach(
+              async item => {
+                if (item.deviceType === result.value) {
+                  await bluetoothManager.connect(item);
+                } else {
+                  console.warn(
+                    'There is no corresponding item in the registry!'
+                  );
+                }
               }
-            });
+            );
           }
         });
       }
@@ -151,12 +155,12 @@ export class DropDownRegistry
   extends Widget
   implements Dialog.IBodyWidget<string>
 {
-  constructor(registry: BluetoothManager.DeviceRegistry) {
+  constructor(registry: BluetoothManager.DeviceTypeRegistry) {
     super();
     this._selectList = document.createElement('select');
     this.node.appendChild(this._selectList);
     this.registry = registry;
-    registry.itemsList.forEach(item => {
+    registry.deviceTypes.forEach(item => {
       const option = document.createElement('option');
       option.value = item.deviceType;
       option.text = item.deviceType;
@@ -169,7 +173,7 @@ export class DropDownRegistry
   }
 
   private _selectList: HTMLSelectElement;
-  public registry: BluetoothManager.DeviceRegistry;
+  public registry: BluetoothManager.DeviceTypeRegistry;
 }
 
 const BluetoothExtensionPlugins: JupyterFrontEndPlugin<any>[] = [
diff --git a/src/bluetooth/BluetoothDeviceRunningItem.ts b/src/bluetooth/BluetoothDeviceRunningItem.ts
index 158794c..3d4373f 100644
--- a/src/bluetooth/BluetoothDeviceRunningItem.ts
+++ b/src/bluetooth/BluetoothDeviceRunningItem.ts
@@ -5,7 +5,7 @@ import { buildCompleteIdentifier } from '../bluetooth-extension';
 import { Menu } from '@lumino/widgets';
 import { CommandRegistry } from '@lumino/commands';
 
-export const disconnectDevice = 'bluetooth-manager:disconnect-device';
+export const disconnect = 'bluetooth-manager:disconnect-device';
 
 export class BluetoothDeviceRunningItem
   implements IRunningSessions.IRunningItem
@@ -58,7 +58,7 @@ export class BluetoothDeviceRunningItem
   }
 
   shutdown() {
-    this.bluetoothManager.disconnectDevice(this._device);
+    this.bluetoothManager.disconnect(this._device);
   }
 
   private _device: BluetoothManager.Device;
diff --git a/src/bluetooth/BluetoothManager.ts b/src/bluetooth/BluetoothManager.ts
index c08376d..3022656 100644
--- a/src/bluetooth/BluetoothManager.ts
+++ b/src/bluetooth/BluetoothManager.ts
@@ -13,11 +13,7 @@ export class BluetoothManager implements IBluetoothManager {
     this.deviceListChanged = new Signal<this, Array<BluetoothManager.Device>>(
       this
     );
-    this.registeredByAPlugin = new Signal<
-      this,
-      BluetoothManager.DeviceRegistry
-    >(this);
-    this._registry = new BluetoothManager.DeviceRegistry();
+    this._deviceTypeRegistry = new BluetoothManager.DeviceTypeRegistry();
     this._deviceList = [];
     this._identifierRegistry = [];
   }
@@ -26,54 +22,50 @@ export class BluetoothManager implements IBluetoothManager {
     return this._deviceList;
   }
 
-  get registry(): BluetoothManager.DeviceRegistry {
-    return this._registry;
+  get deviceTypeRegistry(): BluetoothManager.DeviceTypeRegistry {
+    return this._deviceTypeRegistry;
   }
 
-  get identifierRegistry(): Array<string> {
-    return this._identifierRegistry;
-  }
-
-  async connectDevice(
-    registryItem: IDeviceRegistryItem
+  async connect(
+    registryItem: IDeviceTypeRegistryItem
   ): Promise<BluetoothManager.Device | undefined> {
     const native = await this.requestDevice(registryItem);
     if (native) {
       const device = await registryItem.factory(native);
       if (device && device.isConnected) {
-        this.addDeviceToList(device);
+        this._addDeviceToList(device);
         device.disconnected.connect(async () => {
-          this.removeDeviceFromList(device);
+          this._removeDeviceFromList(device);
         });
         return device;
       }
     }
   }
 
-  async disconnectDevice(device: BluetoothManager.Device) {
+  async disconnect(device: BluetoothManager.Device) {
     await device.disconnect();
     device.dispose();
   }
 
   // Method to add a device to the list
-  addDeviceToList(device: BluetoothManager.Device): void {
+  private _addDeviceToList(device: BluetoothManager.Device): void {
     const identifier = buildCompleteIdentifier(device.native);
-    if (this.identifierRegistry.includes(identifier) === false) {
+    if (this._identifierRegistry.includes(identifier) === false) {
       this._deviceList.push(device);
-      this.identifierRegistry.push(identifier);
+      this._identifierRegistry.push(identifier);
     } else {
-      console.warn('The device is already in the identifierRegistry');
+      console.warn('The device is already in the registry of identifiers');
     }
     // Emit the signal when the list changes
     this.deviceListChanged.emit(this._deviceList);
   }
 
   // Method to remove a device from the list
-  removeDeviceFromList(device: BluetoothManager.Device): void {
+  private _removeDeviceFromList(device: BluetoothManager.Device): void {
     const index = this._deviceList.indexOf(device);
     if (index > -1) {
       this._deviceList.splice(index, 1);
-      this.identifierRegistry.splice(index, 1);
+      this._identifierRegistry.splice(index, 1);
       // Emit the signal when the list changes
       this.deviceListChanged.emit(this._deviceList);
     }
@@ -82,20 +74,11 @@ export class BluetoothManager implements IBluetoothManager {
 
   removeAllDevices() {
     this._deviceList.forEach((device, index) => {
-      this.removeDeviceFromList(device);
+      this._removeDeviceFromList(device);
       this.deviceListChanged.emit(this._deviceList);
     });
   }
 
-  register(registryItem: IDeviceRegistryItem) {
-    this._registry.add(registryItem);
-    this.registeredByAPlugin.emit(this._registry);
-    console.warn(
-      `New item from category ${registryItem.deviceType} is added to the registry.`
-    );
-    return this._registry;
-  }
-
   async checkWebBluetoothSupport(): Promise<boolean> {
     const isWebBluetoothSupported: boolean = navigator.bluetooth ? true : false;
     if (isWebBluetoothSupported === false) {
@@ -109,7 +92,7 @@ export class BluetoothManager implements IBluetoothManager {
   }
 
   async requestDevice(
-    registryItem: IDeviceRegistryItem
+    registryItem: IDeviceTypeRegistryItem
   ): Promise<BluetoothDevice | undefined> {
     const isWebBluetoothSupported = await this.checkWebBluetoothSupport();
     if (isWebBluetoothSupported) {
@@ -124,11 +107,7 @@ export class BluetoothManager implements IBluetoothManager {
 
   private _deviceList: Array<BluetoothManager.Device>;
   public deviceListChanged: Signal<this, Array<BluetoothManager.Device>>;
-  public registeredByAPlugin: Signal<
-    BluetoothManager,
-    BluetoothManager.DeviceRegistry
-  >;
-  private _registry: BluetoothManager.DeviceRegistry;
+  private _deviceTypeRegistry: BluetoothManager.DeviceTypeRegistry;
   private _identifierRegistry: Array<string>;
 }
 
@@ -204,32 +183,6 @@ export namespace BluetoothManager {
       }
     }
 
-    /*async connectAndGetAllServices(): Promise<
-      Array<BluetoothRemoteGATTService> | undefined
-    > {
-      this.native.addEventListener('gattserverdisconnected', event => {
-        this.isConnected = false;
-        this.disconnected.emit(true);
-      });
-      const server = this.native.gatt
-      if (server) {
-        server.connect();
-        if (server.connected === true) {
-          const services = await server.getPrimaryServices();
-          this.isConnected = true;
-          if (!services || services.length === 0) {
-            throw new Error('Server exists but no service found on the device.');
-          } else { return services; }
-        }
-        else {
-          throw new Error('There is no connection to server. No attempt to get a service.')
-        }
-      }
-      else {
-        throw new Error('Server is not defined.');
-      }
-    }*/
-
     async disconnect(): Promise<void> {
       if (this.native) {
         this.native.gatt?.disconnect();
@@ -283,19 +236,27 @@ export namespace BluetoothManager {
     }
   }
 
-  export class DeviceRegistry implements IDeviceRegistry {
-    private _registry: Array<IDeviceRegistryItem>;
-    public registryItem: IDeviceRegistryItem;
+  export class DeviceTypeRegistry implements IDeviceTypeRegistry {
     constructor() {
-      this._registry = [];
+      this._deviceTypes = [];
+      this._added = new Signal<this, IDeviceTypeRegistryItem>(this);
+    }
+
+    add(registryItem: IDeviceTypeRegistryItem) {
+      this._deviceTypes.push(registryItem);
+      this._added.emit(registryItem);
     }
 
-    add(registryItem: IDeviceRegistryItem) {
-      this._registry.push(registryItem);
+    get deviceTypes(): IDeviceTypeRegistryItem[] {
+      return this._deviceTypes;
     }
-    get itemsList(): Array<IDeviceRegistryItem> {
-      return this._registry;
+
+    get added(): Signal<this, IDeviceTypeRegistryItem> {
+      return this._added;
     }
+
+    private _deviceTypes: Array<IDeviceTypeRegistryItem>;
+    private _added: Signal<this, IDeviceTypeRegistryItem>;
   }
 }
 
@@ -303,23 +264,15 @@ export namespace BluetoothManager {
  * Interface for the bluetooth manager.
  */
 export interface IBluetoothManager {
-  addDeviceToList(Device: BluetoothManager.Device): void;
-  removeDeviceFromList(Device: BluetoothManager.Device): void;
   removeAllDevices(Devices: Array<BluetoothManager.Device>): void;
-  register(registryItem: IDeviceRegistryItem): BluetoothManager.DeviceRegistry;
-  connectDevice(registryItem: IDeviceRegistryItem): any;
-  disconnectDevice(device: BluetoothManager.Device): void;
+  connect(registryItem: IDeviceTypeRegistryItem): any;
+  disconnect(device: BluetoothManager.Device): void;
   deviceListChanged: Signal<BluetoothManager, Array<BluetoothManager.Device>>;
-  registeredByAPlugin: Signal<
-    BluetoothManager,
-    BluetoothManager.DeviceRegistry
-  >;
   get deviceList(): Array<BluetoothManager.Device>;
-  get registry(): BluetoothManager.DeviceRegistry;
-  get identifierRegistry(): Array<string>;
+  get deviceTypeRegistry(): BluetoothManager.DeviceTypeRegistry;
 }
 
-export interface IDeviceRegistryItem {
+export interface IDeviceTypeRegistryItem {
   deviceType: string;
   factory: (
     native: BluetoothDevice
@@ -327,9 +280,9 @@ export interface IDeviceRegistryItem {
   options: IDeviceOptions;
 }
 
-export interface IDeviceRegistry {
-  add: (registryItem: IDeviceRegistryItem) => void;
-  get itemsList(): Array<IDeviceRegistryItem>;
+export interface IDeviceTypeRegistry {
+  add: (registryItem: IDeviceTypeRegistryItem) => void;
+  get deviceTypes(): IDeviceTypeRegistryItem[];
 }
 
 export const IBluetoothManager = new Token<IBluetoothManager>(
diff --git a/src/movehub-extension/index.ts b/src/movehub-extension/index.ts
index 19b2505..147d40b 100644
--- a/src/movehub-extension/index.ts
+++ b/src/movehub-extension/index.ts
@@ -6,7 +6,7 @@ import { ITranslator } from '@jupyterlab/translation';
 import { IThemeManager, MainAreaWidget } from '@jupyterlab/apputils';
 import { Toolbar } from '@jupyterlab/ui-components';
 import {
-  IDeviceRegistryItem,
+  IDeviceTypeRegistryItem,
   IBluetoothManager,
   BluetoothManager
 } from '../bluetooth/BluetoothManager';
@@ -27,7 +27,7 @@ export const connectMoveHub = 'bluetooth-manager:connect-movehub';
 export const disconnectMoveHub = 'bluetooth-manager:disconnect-movehub';
 export const moveHubServiceUUID = '00001623-1212-efde-1623-785feabcd123';
 export const moveHubCharacteristicUUID = '00001624-1212-efde-1623-785feabcd123';
-export const movehubRegistryItem: IDeviceRegistryItem = {
+export const movehubRegistryItem: IDeviceTypeRegistryItem = {
   deviceType: 'LEGO® Move Hub',
   options: {
     acceptAllDevices: false,
@@ -56,7 +56,14 @@ const MoveHubRegisterPlugin: JupyterFrontEndPlugin<void> = {
     bluetoothManager: BluetoothManager
   ): void => {
     console.log('JupyterLab move-hub-register plugin is activated!');
-    bluetoothManager.register(movehubRegistryItem);
+    bluetoothManager.deviceTypeRegistry.added.connect(
+      async (sender, movehubRegistryItem) => {
+        console.warn(
+          `New item from category ${movehubRegistryItem.deviceType} is added to the deviceType registry.`
+        );
+      }
+    );
+    bluetoothManager.deviceTypeRegistry.add(movehubRegistryItem);
   }
 };
 
@@ -125,7 +132,7 @@ const LEGOMoveHubControlPanelPlugin: JupyterFrontEndPlugin<void> = {
           device => device.native.id === (args.deviceID as string)
         );
         if (selectedDevice && selectedDevice instanceof MoveHub) {
-          bluetoothManager.disconnectDevice(selectedDevice);
+          bluetoothManager.disconnect(selectedDevice);
           return selectedDevice;
         } else {
           throw new Error('No device provided or device is invalid');
@@ -151,7 +158,7 @@ const LEGOMoveHubControlPanelPlugin: JupyterFrontEndPlugin<void> = {
 
     app.commands.addCommand(connectMoveHub, {
       execute: args => {
-        const newDevice = bluetoothManager.connectDevice(movehubRegistryItem);
+        const newDevice = bluetoothManager.connect(movehubRegistryItem);
         return newDevice;
       },
       caption: 'Connect MoveHub',
diff --git a/src/movehub-extension/widget.tsx b/src/movehub-extension/widget.tsx
index f5d7dd1..789ca4b 100644
--- a/src/movehub-extension/widget.tsx
+++ b/src/movehub-extension/widget.tsx
@@ -174,7 +174,7 @@ export class MoveHubModel extends DOMWidgetModel {
       console.log('not connected yet');*/
     if (identifier === '') {
       this.movehub =
-        await MoveHubModel.bluetoothManager.connectDevice(movehubRegistryItem);
+        await MoveHubModel.bluetoothManager.connect(movehubRegistryItem);
     } else {
       const selectedDevice = MoveHubModel.bluetoothManager.deviceList.find(
         device => device.native.id === identifier