Change icon of an object

• Using data and shell model when creating diagrams. The shell.js. is standard one, taken from Cisco NeXt UI examples. The data is comming from topologyData dictionary. 
• How to change the icon of a network device inside shell.js.
• i.e. how to interact with it withing nx.define. 

(function (nx) {
    /**
     * define application
     */
    var Shell = nx.define(nx.ui.Application, {
        methods: {
            start: function () {
                //your application main entry

                // initialize a topology
                var topo = new nx.graphic.Topology({
                    // set the topology view's with and height
                    width: 1500,
                    height: 850,
                    // node config
                    nodeConfig: {
                        // label display name from of node's model, could change to 'model.id' to show id
                        label: 'model.name'
                    },
                    // link config
                    linkConfig: {
                        // multiple link type is curve, could change to 'parallel' to use parallel link
                        linkType: 'curve'
                    },
                    // show node's icon, could change to false to show dot
                    showIcon: true
                });

                //set data to topology
                topo.data(topologyData);
                //attach topology to document
                topo.attach(this);
            }
        }
    });

    /**
     * create application instance
     */
    var shell = new Shell();

    /**
     * invoke start method
     */
    shell.start();
})(nx);

Cisco DevNet: NeXt UI - Demo 

Base - Set node's label and icon

 `data.js` has:

    nodes: [
        {"id": 0, "x": -250, "y": 350, "name": "RTR01", "icon": "router"},
        {"id": 1, "x": -250, "y": 1100, "name": "RTR02", "icon": "router"},
        {"id": 2, "x": -1000, "y": 700, "name": "RTR03", "icon": "router"},

 then, in `shell.js`have:

                    nodeConfig: {
                        // label display name from of node's model, could change to 'model.id' to show id
                        label: 'model.name',
                        iconType: 'model.icon' 
                    },

 Community/60024 - JSFiddle