BLE Blood Pressure implemented
parent
336c0f17b6
commit
ee5f90aba1
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import 'dart:async';
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import 'dart:io';
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import 'package:diplomaticquarterapp/theme/colors.dart';
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import 'package:diplomaticquarterapp/uitl/ble_utils.dart';
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import 'package:diplomaticquarterapp/uitl/translations_delegate_base.dart';
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import 'package:diplomaticquarterapp/widgets/buttons/defaultButton.dart';
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import 'package:diplomaticquarterapp/widgets/others/app_scaffold_widget.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_blue_plus/flutter_blue_plus.dart';
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import 'package:permission_handler/permission_handler.dart';
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class BloodPressureBLE extends StatefulWidget {
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@override
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State<BloodPressureBLE> createState() => _BloodPressureBLEState();
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}
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class _BloodPressureBLEState extends State<BloodPressureBLE> {
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String connectionStatus = "disconnected";
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String currentBPmmHG = "0/0 mmHG";
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String currentPulse = "0 PPM";
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BluetoothDevice currentConnectedDevice;
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StreamSubscription bloodPressureReadingStream;
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Timer _timer;
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@override
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void dispose() {
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super.dispose();
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if (bloodPressureReadingStream != null) bloodPressureReadingStream.cancel();
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if (currentConnectedDevice != null) currentConnectedDevice.disconnect();
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if (_timer != null && _timer.isActive) _timer.cancel();
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}
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@override
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Widget build(BuildContext context) {
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return AppScaffold(
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appBarTitle: TranslationBase.of(context).bloodPressure,
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showNewAppBar: true,
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isShowDecPage: true,
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showNewAppBarTitle: true,
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backgroundColor: Color(0xffF8F8F8),
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body: SingleChildScrollView(
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child: StreamBuilder<BluetoothAdapterState>(
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stream: FlutterBluePlus.adapterState,
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initialData: BluetoothAdapterState.unknown,
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builder: (c, snapshot) {
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final adapterState = snapshot.data;
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if (adapterState == BluetoothAdapterState.on) {
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return Container(
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margin: EdgeInsets.only(top: 200.0, left: 50.0, right: 50.0),
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child: Column(
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children: [
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Center(
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child: DefaultButton(
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TranslationBase.of(context).start.toUpperCase(),
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() {
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checkBLEPermissions();
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},
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color: CustomColors.green,
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),
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),
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SizedBox(
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height: 50.0,
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),
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Text("Connection state: $connectionStatus"),
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SizedBox(
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height: 50.0,
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),
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Text("Current BP Level: $currentBPmmHG"),
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SizedBox(
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height: 20.0,
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),
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Text("Current Pulse: $currentPulse"),
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],
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),
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);
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} else {
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FlutterBluePlus.stopScan();
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return SizedBox(height: 300.0, child: BluetoothOffScreen(adapterState: adapterState));
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}
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}),
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),
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);
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}
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void checkBLEPermissions() {
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[Permission.location, Permission.storage, Permission.bluetooth, Permission.bluetoothConnect, Permission.bluetoothScan].request().then((status) {
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startBLEConnection();
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});
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}
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void startBLEConnection() {
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if (FlutterBluePlus.isScanningNow == false) {
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setState(() {
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connectionStatus = "Connecting...";
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});
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FlutterBluePlus.startScan(timeout: const Duration(seconds: 5), androidUsesFineLocation: false).then((value) {
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List<ScanResult> blueToothDevices = value;
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blueToothDevices.forEach((element) async {
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if (element.device.localName.isNotEmpty) {
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if (element.device.localName.toLowerCase() == "bpm") {
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element.device.connectionState.listen((BluetoothConnectionState state) async {
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setState(() {
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connectionStatus = state.toString();
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});
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if (state == BluetoothConnectionState.disconnected) {
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// typically, start a periodic timer that tries to periodically reconnect.
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// Note: you must always re-discover services after disconnection!
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// _timer = Timer.periodic(Duration(seconds: 2), (Timer timer) {
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// startBLEConnection();
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// });
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}
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if (state == BluetoothConnectionState.connected) {
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currentConnectedDevice = element.device;
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// _timer.cancel();
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List<BluetoothService> services = await element.device.discoverServices();
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services.forEach((service) {
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if (service.serviceUuid.toString().toLowerCase() == BLEUtils.BLOOD_PRESSURE_SERVICE) {
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print(service.serviceUuid);
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service.characteristics.forEach((characteristic) async {
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if (characteristic.characteristicUuid.toString().toLowerCase() == BLEUtils.BLOOD_PRESSURE_CHARACTERISTIC) {
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print(characteristic.characteristicUuid);
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bloodPressureReadingStream = characteristic.onValueReceived.listen((event) {
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print("onValueReceived Stream");
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print(event);
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setState(() {
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if (event.length < 12) {
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currentBPmmHG = "Measuring...";
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} else {
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currentBPmmHG = "Measurement complete!";
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Map<String, dynamic> results = handleBPResult(event, characteristic);
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currentBPmmHG = results["systolic"] + "/" + results["diastolic"] + " - " + (results["isBPHigh"] == "true" ? "High BP" : "Normal BP");
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currentPulse = results["pulse"] + " - " + (results["isPulseHigh"] == "true" ? "High pulse" : "Normal Pulse");
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}
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});
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});
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await characteristic.setNotifyValue(true);
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}
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});
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return true;
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}
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});
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}
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});
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await element.device.connect(timeout: Duration(seconds: 35));
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return true;
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}
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}
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});
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});
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}
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}
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}
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Map<String, dynamic> handleBPResult(List<int> byteArray, BluetoothCharacteristic characteristic) {
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// [28, 0, 148, 0, 118, 0, 0, 0, 106, 0, 0, 0]
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// {isBPHigh: true, systolic: 145, diastolic: 111, pulse: 109, isPulseHigh: true}
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Map<String, dynamic> results = Map();
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if (byteArray[1] != 0 && byteArray[3] != 0) {
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results["isBPHigh"] = "false";
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results["systolic"] = byteArray[1].toString();
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results["diastolic"] = byteArray[3].toString();
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} else {
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results["isBPHigh"] = "true";
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results["systolic"] = byteArray[2].toString();
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results["diastolic"] = byteArray[4].toString();
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}
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if (byteArray[8] != 0) {
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results["pulse"] = byteArray[8].toString();
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results["isPulseHigh"] = "true";
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} else {
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results["pulse"] = byteArray[9].toString();
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results["isPulseHigh"] = "false";
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}
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if (characteristic.isNotifying) characteristic.setNotifyValue(false);
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print(results);
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return results;
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}
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class BluetoothOffScreen extends StatelessWidget {
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const BluetoothOffScreen({Key key, this.adapterState}) : super(key: key);
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final BluetoothAdapterState adapterState;
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@override
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Widget build(BuildContext context) {
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return ScaffoldMessenger(
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child: Scaffold(
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backgroundColor: Colors.lightBlue,
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body: Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: <Widget>[
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const Icon(
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Icons.bluetooth_disabled,
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size: 200.0,
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color: Colors.white54,
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),
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Text(
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'Bluetooth Adapter is ${adapterState != null ? adapterState.toString().split(".").last + ", Please turn on your bluetooth to continue." : 'not available'}.',
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textAlign: TextAlign.center,
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style: Theme.of(context).primaryTextTheme.titleSmall?.copyWith(color: Colors.white),
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),
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if (Platform.isAndroid)
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ElevatedButton(
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child: const Text('TURN ON'),
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onPressed: () async {
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try {
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if (Platform.isAndroid) {
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await FlutterBluePlus.turnOn();
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}
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} catch (e) {}
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},
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),
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],
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),
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),
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),
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);
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}
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}
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@ -0,0 +1,9 @@
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class BLEUtils {
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//Blood Pressure
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static const String BLOOD_PRESSURE_SERVICE = "0000fff0-0000-1000-8000-00805f9b34fb";
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static const String BLOOD_PRESSURE_CHARACTERISTIC = "0000fff4-0000-1000-8000-00805f9b34fb";
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//Temperature
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static const String TEMPERATURE_SERVICE = "00001809-0000-1000-8000-00805f9b34fb";
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static const String TEMPERATURE_CHARACTERISTIC = "00002a1c-0000-1000-8000-00805f9b34fb";
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}
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