Communication impossible between controllers

PRELIMINARIES

I am developing a web app using angularjs. At some point, my main controller connects to a web service which sends data continuously. To capture and process the stream I am using (http://ajaxpatterns.org/HTTP_Streaming). Everything works like a charm. I would like to share these streaming data with another controller that will process and display them via a jquery chart library (not yet decided which one I gonna use but it is out of the scope of this question). To share these data I have followed this jsfiddle (http://jsfiddle.net/eshepelyuk/vhKfq/).

Please find below some relevant parts of my code.

Module, routes and service definitions:

var platform = angular.module('platform', ['ui']);

platform.config(['$routeProvider',function($routeProvider){
    $routeProvider.
        when('/home',{templateUrl:'partials/home.html',controller:PlatformCtrl}).
        when('/visu/:idVisu', {templateUrl: 'partials/visuTimeSeries.html',controller:VisuCtrl}).
        otherwise({redirectTo:'/home',templateUrl:'partials/home.html'})
}]);

platform.factory('mySharedService', function($rootScope) {
    return {
        broadcast: function(msg) {
            $rootScope.$broadcast('handleBroadcast', msg); 
        }
    };
});

PlatformCtrl definition:

function PlatformCtrl($scope,$http,$q,$routeParams, sharedService) {

  ...

  $scope.listDataVisu ={};

  ...

  $scope.listXhrReq[idVisu] = createXMLHttpRequest();
  $scope.listXhrReq[idVisu].open("get", urlConnect, true);
  $scope.listXhrReq[idVisu].onreadystatechange = function() {
     $scope.$apply(function () {
       var serverResponse = $scope.listXhrReq[idVisu].responseText;
       $scope.listDataVisu[idVisu] = serverResponse.split("\n");
       sharedService.broadcast($scope.listDataVisu);
    });
  };
  $scope.listXhrReq[idVisu].send(null);
  var w = window.open("#/visu/"+idVisu);

  $scope.$on('handleBroadcast', function(){
    console.log("handleBroadcast (platform)");
  });

}

VisuCtrl definition:

function VisuCtrl($scope,$routeParams,sharedService) {

    $scope.idVisu = $routeParams.idVisu;
    $scope.data = [];

    /* ***************************************
     *   LISTENER FOR THE HANDLEBROADCAST EVENT
     *****************************************/ 

    $scope.$on('handleBroadcast', function(event,data){
        console.log("handleBroadcast (visu)");
        $scope.data = data[$scope.idVisu];
    });


}

Injection:

PlatformCtrl.$inject = ['$scope','$http','$q','$routeParams','mySharedService'];
VisuCtrl.$inject = ['$scope','$routeParams','mySharedService'];

PROBLEM DEFINITION

When running this code, it looks like only the PlatformCtrl controller listens for the handleBroadcast event. Indeed, having a look to the console all what is displayed is only handleBroadcast (platform) every time new data arrive. I am very surprised because I have read in the official documentation that the $broadcast function

dispatches an event name downwards to all child scopes (and their children) notifying the registered ng.$rootScope.Scope#$on listeners.

Since all the scopes in a given app inherits from $rootScope, I do not get why the $on function in VisuCtrl is not launched every time new data are broadcasted.