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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| import 'dart:async'; | ||
| import 'dart:typed_data'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_blue_plus/flutter_blue_plus.dart'; | ||
| import 'package:fluttertoast/fluttertoast.dart'; | ||
|
|
||
| class HomePage extends StatefulWidget { | ||
| const HomePage({Key? key}) : super(key: key); | ||
|
|
||
| @override | ||
| State<HomePage> createState() => _HomePageState(); | ||
| } | ||
|
|
||
| class _HomePageState extends State<HomePage> { | ||
| FlutterBluePlus flutterBlue = FlutterBluePlus.instance; | ||
| final availableDevices = <BluetoothDevice>[]; | ||
| BluetoothDevice? anemometer = null; | ||
| BluetoothService? windSpeedService = null; | ||
| BluetoothCharacteristic? windSpeedCharcteristic = null; | ||
| Timer? periodicTimerHandle = null; | ||
| double windSpeed = 0; | ||
|
|
||
| @override | ||
| void initState() { | ||
| // TODO: implement initState | ||
| super.initState(); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| appBar: AppBar( | ||
| title: Text("Anemometer"), | ||
| ), | ||
| body: FutureBuilder( | ||
| future: bodyWidget(), | ||
| builder: (context, AsyncSnapshot<Widget> snapshot) { | ||
| if (snapshot.hasData) { | ||
| return snapshot.data!; | ||
| } | ||
| return const Center(child: Text("Shomething went wrong")); | ||
| })); | ||
| } | ||
|
|
||
| Widget connectToADeviceWidget() { | ||
| return Center( | ||
| child: RefreshIndicator( | ||
| onRefresh: startDiscovery, | ||
| child: ListView.builder( | ||
| itemBuilder: ((context, index) => ListTile( | ||
| title: Text(availableDevices[index].name), | ||
| onTap: () => connectToDevice(index), | ||
| )), | ||
| itemCount: availableDevices.length, | ||
| ))); | ||
| } | ||
|
|
||
| Future<void> connectToDevice(int deviceIndex) async { | ||
| await availableDevices[deviceIndex].connect(); | ||
| List<BluetoothDevice> connectedDevices = await flutterBlue.connectedDevices; | ||
| if (connectedDevices.contains(availableDevices[deviceIndex])) { | ||
| List<BluetoothService> services = | ||
| await availableDevices[deviceIndex].discoverServices(); | ||
| services.forEach((service) { | ||
| if (service.isPrimary) { | ||
| windSpeedService = service; | ||
| for (BluetoothCharacteristic characteristic | ||
| in service.characteristics) { | ||
| print("UUID: ${characteristic.serviceUuid}"); | ||
| if (characteristic.serviceUuid.toString() == | ||
| "00000000-0000-0000-0000-00000000702a") { | ||
| windSpeedCharcteristic = characteristic; | ||
| } | ||
| } | ||
| } | ||
| }); | ||
| setState(() { | ||
| anemometer = availableDevices[deviceIndex]; | ||
| }); | ||
| } | ||
| Fluttertoast.showToast( | ||
| msg: "Connection successful!", | ||
| toastLength: Toast.LENGTH_SHORT, | ||
| backgroundColor: Colors.green); | ||
| if (periodicTimerHandle == null) { | ||
| periodicTimerHandle = Timer.periodic(Duration(seconds: 1), (timer) async { | ||
| await fetchWindSpeed(); | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| Future<void> startDiscovery() async { | ||
| setState(() => availableDevices.removeWhere((element) => true)); | ||
| await flutterBlue.startScan(timeout: Duration(seconds: 4)); | ||
| flutterBlue.scanResults.listen((result) { | ||
| for (var r in result) { | ||
| if (!availableDevices.contains(r.device) && | ||
| r.device.name == "Anemometer V1") { | ||
| print("FOUND Anemometer: ${r.device.name}"); | ||
| setState(() => availableDevices.add(r.device)); | ||
| } | ||
| } | ||
| }); | ||
| flutterBlue.stopScan(); | ||
| } | ||
|
|
||
| Widget turnOnBtWidget() { | ||
| return RefreshIndicator( | ||
| child: Center(child: Text("Turn on bluetooth")), | ||
| onRefresh: () async => (await flutterBlue.isOn) ? setState(() {}) : null, | ||
| ); | ||
| } | ||
|
|
||
| Widget windSpeedWidget() { | ||
| return Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| crossAxisAlignment: CrossAxisAlignment.center, | ||
| children: [ | ||
| Text("Wind Speed", style: TextStyle( | ||
| fontSize: 26, fontWeight: FontWeight.w300 | ||
| )), | ||
| Text("${windSpeed.toStringAsFixed(2)} m/s", | ||
| style: TextStyle(fontSize: 21, fontWeight: FontWeight.bold)) | ||
| ])); | ||
| } | ||
|
|
||
| Future<void> fetchWindSpeed() async { | ||
| List<int> readData = await windSpeedCharcteristic!.read(); | ||
| setState(() { | ||
| windSpeed = | ||
| ByteData.sublistView(Uint8List.fromList(readData.reversed.toList())) | ||
| .getFloat32(0); | ||
| }); | ||
| } | ||
|
|
||
| Future<Widget> bodyWidget() async { | ||
| if (await flutterBlue.isOn) { | ||
| try { | ||
| List<BluetoothDevice> connectedDevices = | ||
| await flutterBlue.connectedDevices; | ||
|
|
||
| if (anemometer == null) { | ||
| connectedDevices | ||
| .firstWhere((element) => element.name == "Anemometer V1") | ||
| .disconnect(); | ||
| return connectToADeviceWidget(); | ||
| } | ||
| } on StateError catch (_, e) { | ||
| return connectToADeviceWidget(); | ||
| } | ||
| if (windSpeedCharcteristic == null) { | ||
| Fluttertoast.showToast( | ||
| msg: "Connection failed", | ||
| toastLength: Toast.LENGTH_SHORT, | ||
| backgroundColor: Colors.red); | ||
| setState(() async { | ||
| await anemometer!.disconnect(); | ||
| anemometer = null; | ||
| windSpeedCharcteristic = null; | ||
| windSpeedService = null; | ||
| }); | ||
| } | ||
| return windSpeedWidget(); | ||
| } else { | ||
| return turnOnBtWidget(); | ||
| } | ||
| } | ||
| } |
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