feat(dfu-update): add DfuUpdate Plugin Wrapper (#3514)

* feat(dfu-update): add DfuUpdate Plugin Wrapper

* repo url changed

* updateFirmware options are now presented via Object

* import fixed

src/@ionic-native/plugins/dfu-update/index.ts

@@ -0,0 +1,66 @@
+import { Injectable } from '@angular/core';
+import { Plugin, Cordova, IonicNativePlugin } from '@ionic-native/core';
+import { Observable } from 'rxjs';
+
+export interface UpdateOptions {
+  /**
+   * A string that contains the identifier for the Bluetooth LE device to update. It will either be a MAC address (on Android) or a UUID (on iOS).
+   */
+  deviceId: string;
+
+  /**
+   * A string that is the path to the file to use in the update. It can be either in either `cdvfile://` or `file://` format.
+   */
+  fileUrl: string;
+
+  /**
+   * The PacketReceiptNotificationsValue (Default to 10)
+   */
+  packetReceiptNotificationsValue?: number;
+}
+
+/**
+ * @name Dfu Update
+ * @description
+ * This plugin is a Wrapper to use Nordic Semiconductor's Device Firmware Update (DFU) service to update a Bluetooth LE device.
+ *
+ * @usage
+ * ```typescript
+ * import { DfuUpdate } from '@ionic-native/dfu-update/ngx';
+ *
+ *
+ * constructor(private dfuUpdate: DfuUpdate) { }
+ *
+ * ...
+ *
+ *
+ * this.dfuUpdate.updateFirmware('fileURL', 'deviceIdentifier')
+ *   .then((res: any) => console.log(res))
+ *   .catch((error: any) => console.error(error));
+ *
+ * ```
+ */
+@Plugin({
+  pluginName: 'DfuUpdate',
+  plugin: 'cordova-plugin-dfu-update',
+  pluginRef: 'window.DfuUpdate',
+  repo: 'https://github.com/EinfachHans/cordova-plugin-dfu-update',
+  install: 'ionic cordova plugin add cordova-plugin-dfu-update --variable ANDROID_NORDIC_VERSION="1.11.0"',
+  installVariables: ['ANDROID_NORDIC_VERSION'],
+  platforms: ['Android', 'iOS'],
+})
+@Injectable()
+export class DfuUpdate extends IonicNativePlugin {
+  /**
+   * Start the Firmware-Update-Process
+   * @param options - Options for the process
+   * @return {Observable<any>} Returns a Observable that emits when something happens
+   */
+  @Cordova({
+    observable: true,
+    callbackOrder: 'reverse',
+  })
+  updateFirmware(options: UpdateOptions): Observable<any> {
+    return;
+  }
+}