Minor refactoring for merge with PE

@@ -1342,7 +1342,7 @@ export class EntityService {
     return entitiesObservable;
   }
 
-  public getEdgeEventContentByEntityType(entity: any): Observable<any> {
+  public getEdgeEventContent(entity: any): Observable<any> {
     let entityObservable: Observable<any>;
     const entityId: string = entity.entityId;
     const entityType: any = entity.type;

@@ -47,8 +47,8 @@ import { AttributeService } from '@core/http/attribute.service';
 import { AttributeScope } from '@shared/models/telemetry/telemetry.models';
 import { EdgeDownlinkTableHeaderComponent } from '@home/components/edge/edge-downlink-table-header.component';
 import { EdgeService } from '@core/http/edge.service';
-import { map } from 'rxjs/operators';
-import { EntityService } from "@core/http/entity.service";
+import { map, mergeMap } from 'rxjs/operators';
+import { EntityService } from '@core/http/entity.service';
 
 export class EdgeDownlinkTableConfig extends EntityTableConfig<EdgeEvent, TimePageLink> {
 
@@ -85,26 +85,13 @@ export class EdgeDownlinkTableConfig extends EntityTableConfig<EdgeEvent, TimePa
   }
 
   fetchEvents(pageLink: TimePageLink): Observable<PageData<EdgeEvent>> {
-    this.loadEdgeInfo();
-    return this.edgeService.getEdgeEvents(this.entityId, pageLink);
-  }
-
-  loadEdgeInfo(): void {
-    this.attributeService.getEntityAttributes(this.entityId, AttributeScope.SERVER_SCOPE, ['queueStartTs'])
-      .subscribe(
-        attributes => this.onUpdate(attributes)
-      );
-  }
-
-  onUpdate(attributes) {
-    this.queueStartTs = 0;
-    let edge = attributes.reduce(function (map, attribute) {
-      map[attribute.key] = attribute;
-      return map;
-    }, {});
-    if (edge.queueStartTs) {
-      this.queueStartTs = edge.queueStartTs.lastUpdateTs;
-    }
+    return this.attributeService.getEntityAttributes(this.entityId, AttributeScope.SERVER_SCOPE, ['queueStartTs']).pipe(
+      map((attributes) => {
+          const queueStartTs = attributes[0];
+          this.queueStartTs = queueStartTs ? queueStartTs.lastUpdateTs : 0;
+      }),
+      mergeMap(() => this.edgeService.getEdgeEvents(this.entityId, pageLink))
+    );
   }
 
   updateColumns(updateTableColumns: boolean = false): void {
@@ -129,7 +116,8 @@ export class EdgeDownlinkTableConfig extends EntityTableConfig<EdgeEvent, TimePa
           isEnabled: (entity) => this.isEdgeEventHasData(entity.type),
           onAction: ($event, entity) =>
             {
-              this.prepareEdgeEventContent(entity).subscribe((content) => {
+              this.prepareEdgeEventContent(entity).subscribe(
+                (content) => {
                 this.showEdgeEventContent($event, content,'event.data');
               });
             }
@@ -142,7 +130,7 @@ export class EdgeDownlinkTableConfig extends EntityTableConfig<EdgeEvent, TimePa
   }
 
   updateEdgeEventStatus(createdTime): string {
-    if (this.queueStartTs && createdTime < this.queueStartTs) {
+    if (createdTime < this.queueStartTs) {
       return this.translate.instant('edge.deployed');
     } else {
       return this.translate.instant('edge.pending');
@@ -163,7 +151,7 @@ export class EdgeDownlinkTableConfig extends EntityTableConfig<EdgeEvent, TimePa
   }
 
   prepareEdgeEventContent(entity: any): Observable<string> {
-    return this.entityService.getEdgeEventContentByEntityType(entity).pipe(
+    return this.entityService.getEdgeEventContent(entity).pipe(
       map((result) => JSON.stringify(result))
     );
   }

@@ -40,12 +40,6 @@
     </fieldset>
   </div>
   <div mat-dialog-actions fxLayoutAlign="end center">
-    <button mat-raised-button color="primary"
-            type="submit"
-            [disabled]="(isLoading$ | async) || addEntitiesToEdgeFormGroup.invalid
-            || !addEntitiesToEdgeFormGroup.dirty">
-      {{ 'action.assign' | translate }}
-    </button>
     <button mat-button color="primary"
             style="margin-right: 20px;"
             type="button"
@@ -53,5 +47,11 @@
             (click)="cancel()">
       {{ 'action.cancel' | translate }}
     </button>
+    <button mat-raised-button color="primary"
+            type="submit"
+            [disabled]="(isLoading$ | async) || addEntitiesToEdgeFormGroup.invalid
+            || !addEntitiesToEdgeFormGroup.dirty">
+      {{ 'action.assign' | translate }}
+    </button>
   </div>
 </form>

@@ -69,7 +69,7 @@ export class AddEntitiesToEdgeDialogComponent extends
               public dialogRef: MatDialogRef<AddEntitiesToEdgeDialogComponent, boolean>,
               public fb: FormBuilder) {
     super(store, router, dialogRef);
-    this.entityType = data.entityType;
+    this.entityType = this.data.entityType;
   }
 
   ngOnInit(): void {
@@ -77,7 +77,7 @@ export class AddEntitiesToEdgeDialogComponent extends
       entityIds: [null, [Validators.required]]
     });
     this.subType = '';
-    switch (this.data.entityType) {
+    switch (this.entityType) {
       case EntityType.DEVICE:
         this.assignToEdgeTitle = 'device.assign-device-to-edge-title';
         this.assignToEdgeText = 'device.assign-device-to-edge-text';
@@ -118,7 +118,7 @@ export class AddEntitiesToEdgeDialogComponent extends
     const tasks: Observable<any>[] = [];
     entityIds.forEach(
       (entityId) => {
-        tasks.push(this.getAssignToEdgeTask(this.data.edgeId, entityId));
+        tasks.push(this.getAssignToEdgeTask(this.data.edgeId, entityId, this.entityType));
       }
     );
     forkJoin(tasks).subscribe(
@@ -128,8 +128,8 @@ export class AddEntitiesToEdgeDialogComponent extends
     );
   }
 
-  private getAssignToEdgeTask(edgeId: string, entityId: string): Observable<any> {
-    switch (this.data.entityType) {
+  private getAssignToEdgeTask(edgeId: string, entityId: string, entityType: EntityType): Observable<any> {
+    switch (entityType) {
       case EntityType.DEVICE:
         return this.deviceService.assignDeviceToEdge(edgeId, entityId);
       case EntityType.ASSET: