add SignalR client service

app/home/home.component.ts

@@ -1,11 +1,37 @@
 import { Component, OnInit } from '@angular/core';
 
+import { FeedService, ConnectionState } from '../shared/feed.service';
+
 @Component({
     selector: 'home',
     templateUrl: 'app/home/home.component.html'
 })
 export class HomeComponent implements OnInit {
-    constructor() { }
 
-    ngOnInit() { }
+    error: any;
+
+    constructor(private service: FeedService) { }
+
+    ngOnInit() {
+        this.service.connectionState
+            .subscribe(
+            connectionState => {
+                if (connectionState == ConnectionState.Connected) {
+                    console.log('Connected!');
+                } else {
+                    console.log(connectionState.toString());
+                }
+            },
+            error => {
+                this.error = error;
+                console.log(error);
+            });
+
+        if (this.service.currentState === ConnectionState.Connected) {
+            console.log(' connected....');
+        }
+        else {
+            console.log('not connected');
+        }
+    }
 }