Let Broadcast class to generate HTTP response to pause, and resume.

src/main/java/altk/comm/engine/CommEngine.java

@@ -332,8 +332,7 @@ public abstract class CommEngine extends HttpServlet
 	        out.format("Broadcast %s does not exist", broadcastId);
 	        return;
 	    }
-	    broadcast.pause();
-	    out.write("OK");
+	    broadcast.pause(out);
     }
 
 
@@ -347,8 +346,7 @@ public abstract class CommEngine extends HttpServlet
             out.format("Broadcast %s does not exist", broadcastId);
             return;
         }
-        broadcast.resume();
-        out.write("OK");
+        broadcast.resume(out);
     }
 
     /**