add structure

lib/vo/device.dart

@@ -0,0 +1,24 @@
+class PhoneDevice {
+  String id;
+  String name;
+  bool deviceOn;
+  bool primaryDevice;
+  PhoneDevice({this.id, this.name, this.deviceOn, this.primaryDevice});
+
+  factory PhoneDevice.fromMap(Map<String, dynamic> map, String id) {
+    return PhoneDevice(
+        id: id,
+        name: map['name'],
+        deviceOn: map['device_on'],
+        primaryDevice: map['primary_device']);
+  }
+
+   bool isDeviceOn() {
+    return this.deviceOn == true;
+  }
+
+  @override
+  String toString() {
+    return 'PhoneDevice{id:$id, name:$name,deviceOn:$deviceOn,primaryDevice:$primaryDevice}';
+  }
+}