services.js

function MyService () {
  var sharableData = [];

  return {
    data: sharableData,
    doSomething: function () {
      webSocket.on('gettinData', function (data) {
        sharableData.push(data);
      });
    }
  };
}

function MyController (MyService) {
  $scope.packetData = MyService.data;
  // maybe fire of some initializing to the service..
  // MyService.startFetchingData(); // etc...
}