Добавил загрузку модели, добавил рыбу делегата

LightsModel.qml

@@ -0,0 +1,39 @@
+import QtQml.Models 2.1
+
+ListModel {
+    id: root
+
+    property string serviceUrl: undefined
+
+    signal error(string text)
+
+    onServiceUrlChanged: reload()
+
+    function reload() {
+        var request = new XMLHttpRequest()
+
+        request.open('GET', root.serviceUrl + '/static/channels.js')
+        request.onreadystatechange = function () {
+            if (request.readyState !== XMLHttpRequest.DONE) {
+                return
+            }
+
+            if (request.status === 200) {
+                populateModel(JSON.parse(request.responseText))
+                return
+            }
+
+            root.error(qsTr("[%1] Request error: %2").
+                      arg(request.status).
+                      arg(request.statusText))
+        }
+
+        request.send()
+    }
+
+    function populateModel(data) {
+        data.groups.forEach(function (group) {
+            root.append(group)
+        })
+    }
+}