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ESP32 | FLUTTER | BLE - Temperature & Humidity Check App
This commit is contained in:
Eric
@@ -0,0 +1,483 @@
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// Copyright 2017, Paul DeMarco.
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// All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:async';
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import 'dart:convert' show utf8;
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import 'package:flutter/material.dart';
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import 'package:flutter_ble/flutter_ble.dart';
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import 'package:flutter_ble_app/widgets.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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void main() {
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runApp(new FlutterBleApp());
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}
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class FlutterBleApp extends StatefulWidget {
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FlutterBleApp({Key key, this.title}) : super(key: key);
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final String title;
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@override
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_FlutterBleAppState createState() => new _FlutterBleAppState();
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}
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class _FlutterBleAppState extends State<FlutterBleApp> {
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Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
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FlutterBle _flutterBlue = FlutterBle.instance;
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/// Scanning
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StreamSubscription _scanSubscription;
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Map<DeviceIdentifier, ScanResult> scanResults = new Map();
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bool isScanning = false;
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/// State
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StreamSubscription _stateSubscription;
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BluetoothState state = BluetoothState.unknown;
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/// Device
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BluetoothDevice device;
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bool get isConnected => (device != null);
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StreamSubscription deviceConnection;
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StreamSubscription deviceStateSubscription;
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List<BluetoothService> services = new List();
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Map<Guid, StreamSubscription> valueChangedSubscriptions = {};
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BluetoothDeviceState deviceState = BluetoothDeviceState.disconnected;
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static const String CHARACTERISTIC_UUID =
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"beb5483e-36e1-4688-b7f5-ea07361b26a8";
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static const String kMYDEVICE = "myDevice";
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String _myDeviceId;
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String _temperature = "?";
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String _humidity = "?";
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@override
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void initState() {
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super.initState();
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// Immediately get the state of FlutterBle
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_flutterBlue.state.then((s) {
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setState(() {
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state = s;
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});
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});
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// Subscribe to state changes
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_stateSubscription = _flutterBlue.onStateChanged().listen((s) {
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setState(() {
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state = s;
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});
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});
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_loadMyDeviceId();
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}
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_loadMyDeviceId() async {
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SharedPreferences prefs = await _prefs;
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_myDeviceId = prefs.getString(kMYDEVICE) ?? "";
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print("_myDeviceId : " + _myDeviceId);
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if (_myDeviceId.isNotEmpty) {
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_startScan();
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}
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}
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@override
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void dispose() {
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_stateSubscription?.cancel();
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_stateSubscription = null;
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_scanSubscription?.cancel();
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_scanSubscription = null;
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deviceConnection?.cancel();
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deviceConnection = null;
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super.dispose();
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}
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_startScan() {
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_scanSubscription = _flutterBlue
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.scan(
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timeout: const Duration(seconds: 5),
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/*withServices: [
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new Guid('0000180F-0000-1000-8000-00805F9B34FB')
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]*/
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)
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.listen((scanResult) {
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// print('localName: ${scanResult.advertisementData.localName}');
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// print(
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// 'manufacturerData: ${scanResult.advertisementData.manufacturerData}');
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// print('serviceData: ${scanResult.advertisementData.serviceData}');
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if (_myDeviceId == scanResult.device.id.toString()) {
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_stopScan();
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_connect(scanResult.device);
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}
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setState(() {
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scanResults[scanResult.device.id] = scanResult;
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});
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}, onDone: _stopScan);
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setState(() {
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isScanning = true;
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});
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}
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_stopScan() {
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_scanSubscription?.cancel();
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_scanSubscription = null;
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setState(() {
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isScanning = false;
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});
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}
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_connect(BluetoothDevice d) async {
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device = d;
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// Connect to device
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deviceConnection = _flutterBlue
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.connect(device, timeout: const Duration(seconds: 4))
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.listen(
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null,
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onDone: _disconnect,
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);
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// Update the connection state immediately
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device.state.then((s) {
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setState(() {
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deviceState = s;
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});
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});
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// Subscribe to connection changes
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deviceStateSubscription = device.onStateChanged().listen((s) {
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setState(() {
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deviceState = s;
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});
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if (s == BluetoothDeviceState.connected) {
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device.discoverServices().then((s) {
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setState(() {
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services = s;
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print("*** device.id : ${device.id.toString()}");
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_restoreDeviceId(device.id.toString());
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_TurnOnCharacterService();
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});
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});
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}
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});
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}
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_disconnect() {
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// Remove all value changed listeners
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valueChangedSubscriptions.forEach((uuid, sub) => sub.cancel());
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valueChangedSubscriptions.clear();
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deviceStateSubscription?.cancel();
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deviceStateSubscription = null;
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deviceConnection?.cancel();
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deviceConnection = null;
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setState(() {
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device = null;
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});
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}
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_readCharacteristic(BluetoothCharacteristic c) async {
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await device.readCharacteristic(c);
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setState(() {});
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}
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_writeCharacteristic(BluetoothCharacteristic c) async {
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await device.writeCharacteristic(c, [0x12, 0x34],
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type: CharacteristicWriteType.withResponse);
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setState(() {});
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}
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_readDescriptor(BluetoothDescriptor d) async {
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await device.readDescriptor(d);
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setState(() {});
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}
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_writeDescriptor(BluetoothDescriptor d) async {
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await device.writeDescriptor(d, [0x12, 0x34]);
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setState(() {});
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}
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_setNotification(BluetoothCharacteristic c) async {
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if (c.isNotifying) {
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await device.setNotifyValue(c, false);
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// Cancel subscription
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valueChangedSubscriptions[c.uuid]?.cancel();
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valueChangedSubscriptions.remove(c.uuid);
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} else {
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await device.setNotifyValue(c, true);
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// ignore: cancel_subscriptions
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final sub = device.onValueChanged(c).listen((d) {
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final decoded = utf8.decode(d);
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_DataParser(decoded);
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// setState(() {
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// print('onValueChanged $d');
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// });
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});
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// Add to map
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valueChangedSubscriptions[c.uuid] = sub;
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}
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setState(() {});
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}
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_refreshDeviceState(BluetoothDevice d) async {
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var state = await d.state;
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setState(() {
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deviceState = state;
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print('State refreshed: $deviceState');
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});
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}
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_buildScanningButton() {
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if (isConnected || state != BluetoothState.on) {
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return null;
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}
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if (isScanning) {
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return new FloatingActionButton(
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child: new Icon(Icons.stop),
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onPressed: _stopScan,
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backgroundColor: Colors.red,
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);
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} else {
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return new FloatingActionButton(
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child: new Icon(Icons.search), onPressed: _startScan);
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}
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}
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_buildScanResultTiles() {
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return scanResults.values
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.map((r) => ScanResultTile(
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result: r,
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onTap: () => _connect(r.device),
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))
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.toList();
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}
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List<Widget> _buildServiceTiles() {
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return services
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.map(
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(s) => new ServiceTile(
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service: s,
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characteristicTiles: s.characteristics
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.map(
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(c) => new CharacteristicTile(
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characteristic: c,
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onReadPressed: () => _readCharacteristic(c),
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onWritePressed: () => _writeCharacteristic(c),
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onNotificationPressed: () => _setNotification(c),
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descriptorTiles: c.descriptors
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.map(
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(d) => new DescriptorTile(
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descriptor: d,
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onReadPressed: () => _readDescriptor(d),
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onWritePressed: () => _writeDescriptor(d),
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),
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)
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.toList(),
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),
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)
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.toList(),
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),
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)
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.toList();
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}
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_buildActionButtons() {
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if (isConnected) {
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return <Widget>[
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new IconButton(
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icon: const Icon(Icons.cancel),
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onPressed: () => _disconnect(),
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)
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];
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}
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}
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_buildAlertTile() {
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return new Container(
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color: Colors.redAccent,
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child: new ListTile(
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title: new Text(
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'Bluetooth adapter is ${state.toString().substring(15)}',
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style: Theme.of(context).primaryTextTheme.subhead,
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),
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trailing: new Icon(
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Icons.error,
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color: Theme.of(context).primaryTextTheme.subhead.color,
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),
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),
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);
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}
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_buildDeviceStateTile() {
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return new ListTile(
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leading: (deviceState == BluetoothDeviceState.connected)
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? const Icon(Icons.bluetooth_connected)
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: const Icon(Icons.bluetooth_disabled),
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title: new Text('Device is ${deviceState.toString().split('.')[1]}.'),
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subtitle: new Text('${device.id}'),
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trailing: new IconButton(
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icon: const Icon(Icons.refresh),
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onPressed: () => _refreshDeviceState(device),
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color: Theme.of(context).iconTheme.color.withOpacity(0.5),
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));
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}
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_buildProgressBarTile() {
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return new LinearProgressIndicator();
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}
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@override
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Widget build(BuildContext context) {
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var tiles = new List<Widget>();
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if (state != BluetoothState.on) {
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tiles.add(_buildAlertTile());
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}
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if (isConnected) {
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// tiles.add(_buildDeviceStateTile());
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// tiles.addAll(_buildServiceTiles());
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} else {
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tiles.addAll(_buildScanResultTiles());
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}
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return new MaterialApp(
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debugShowCheckedModeBanner: false,
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home: new Scaffold(
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appBar: new AppBar(
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title: const Text('ESP32 MY DHT APP'),
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actions: _buildActionButtons(),
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backgroundColor: Colors.blueGrey,
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centerTitle: true,
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),
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backgroundColor: Colors.red,
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floatingActionButton: _buildScanningButton(),
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body: new Stack(
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children: <Widget>[
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(isScanning) ? _buildProgressBarTile() : new Container(),
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isConnected
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? _bulldMyWidget()
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: new ListView(
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children: tiles,
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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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Future<void> _restoreDeviceId(String id) async {
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final SharedPreferences prefs = await _prefs;
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prefs.setString(kMYDEVICE, id);
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}
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_TurnOnCharacterService() {
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services.forEach((service) {
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service.characteristics.forEach((character) {
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if (character.uuid.toString() == CHARACTERISTIC_UUID) {
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_setNotification(character);
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}
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});
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});
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}
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_bulldMyWidget() {
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return Center(
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: <Widget>[
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Card(
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child: Container(
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width: 150,
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height: 200,
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||||
child: Column(
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||||
crossAxisAlignment: CrossAxisAlignment.center,
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children: <Widget>[
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SizedBox(
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height: 10,
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),
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Container(
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width: 100,
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height: 100,
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child: Image.asset('images/temperature.png'),
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),
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SizedBox(
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height: 10,
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),
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Text(
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"Temperature",
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style: TextStyle(fontWeight: FontWeight.bold),
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),
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Expanded(
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||||
child: Container(),
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||||
),
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Text(
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||||
_temperature,
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style: TextStyle(fontSize: 30),
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||||
),
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||||
SizedBox(
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||||
height: 10,
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||||
),
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||||
],
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||||
),
|
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),
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),
|
||||
Card(
|
||||
child: Container(
|
||||
width: 150,
|
||||
height: 200,
|
||||
child: Column(
|
||||
crossAxisAlignment: CrossAxisAlignment.center,
|
||||
children: <Widget>[
|
||||
SizedBox(
|
||||
height: 10,
|
||||
),
|
||||
Container(
|
||||
width: 100,
|
||||
height: 100,
|
||||
child: Image.asset('images/humidity.png'),
|
||||
),
|
||||
SizedBox(
|
||||
height: 10,
|
||||
),
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||||
Text(
|
||||
"Humidity",
|
||||
style: TextStyle(fontWeight: FontWeight.bold),
|
||||
),
|
||||
Expanded(
|
||||
child: Container(),
|
||||
),
|
||||
Text(
|
||||
_humidity,
|
||||
style: TextStyle(fontSize: 30),
|
||||
),
|
||||
SizedBox(
|
||||
height: 10,
|
||||
),
|
||||
],
|
||||
),
|
||||
),
|
||||
)
|
||||
],
|
||||
),
|
||||
);
|
||||
}
|
||||
|
||||
_DataParser(String data) {
|
||||
if (data.isNotEmpty) {
|
||||
var tempValue = data.split(",")[0];
|
||||
var humidityValue = data.split(",")[1];
|
||||
|
||||
print("tempValue: ${tempValue}");
|
||||
print("humidityValue: ${humidityValue}");
|
||||
|
||||
setState(() {
|
||||
_temperature = tempValue + "'C";
|
||||
_humidity = humidityValue + "%";
|
||||
});
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,280 @@
|
||||
// Copyright 2017, Paul DeMarco.
|
||||
// All rights reserved. Use of this source code is governed by a
|
||||
// BSD-style license that can be found in the LICENSE file.
|
||||
|
||||
import 'package:flutter/material.dart';
|
||||
import 'package:flutter_ble/flutter_ble.dart';
|
||||
|
||||
class ScanResultTile extends StatelessWidget {
|
||||
const ScanResultTile({Key key, this.result, this.onTap}) : super(key: key);
|
||||
|
||||
final ScanResult result;
|
||||
final VoidCallback onTap;
|
||||
|
||||
Widget _buildTitle(BuildContext context) {
|
||||
if (result.device.name.length > 0) {
|
||||
return Column(
|
||||
mainAxisAlignment: MainAxisAlignment.start,
|
||||
crossAxisAlignment: CrossAxisAlignment.start,
|
||||
children: <Widget>[
|
||||
Text(result.device.name),
|
||||
Text(
|
||||
result.device.id.toString(),
|
||||
style: Theme.of(context).textTheme.caption,
|
||||
)
|
||||
],
|
||||
);
|
||||
} else {
|
||||
return Text(result.device.id.toString());
|
||||
}
|
||||
}
|
||||
|
||||
Widget _buildAdvRow(BuildContext context, String title, String value) {
|
||||
return Padding(
|
||||
padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 4.0),
|
||||
child: Row(
|
||||
crossAxisAlignment: CrossAxisAlignment.start,
|
||||
children: <Widget>[
|
||||
Text(title, style: Theme.of(context).textTheme.caption),
|
||||
SizedBox(
|
||||
width: 12.0,
|
||||
),
|
||||
Expanded(
|
||||
child: Text(
|
||||
value,
|
||||
style: Theme.of(context)
|
||||
.textTheme
|
||||
.caption
|
||||
.apply(color: Colors.black),
|
||||
softWrap: true,
|
||||
),
|
||||
),
|
||||
],
|
||||
),
|
||||
);
|
||||
}
|
||||
|
||||
String getNiceHexArray(List<int> bytes) {
|
||||
return '[${bytes.map((i) => i.toRadixString(16).padLeft(2, '0')).join(', ')}]'
|
||||
.toUpperCase();
|
||||
}
|
||||
|
||||
String getNiceManufacturerData(Map<int, List<int>> data) {
|
||||
if (data.isEmpty) {
|
||||
return null;
|
||||
}
|
||||
List<String> res = [];
|
||||
data.forEach((id, bytes) {
|
||||
res.add(
|
||||
'${id.toRadixString(16).toUpperCase()}: ${getNiceHexArray(bytes)}');
|
||||
});
|
||||
return res.join(', ');
|
||||
}
|
||||
|
||||
String getNiceServiceData(Map<String, List<int>> data) {
|
||||
if (data.isEmpty) {
|
||||
return null;
|
||||
}
|
||||
List<String> res = [];
|
||||
data.forEach((id, bytes) {
|
||||
res.add('${id.toUpperCase()}: ${getNiceHexArray(bytes)}');
|
||||
});
|
||||
return res.join(', ');
|
||||
}
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
return ExpansionTile(
|
||||
title: _buildTitle(context),
|
||||
leading: Text(result.rssi.toString()),
|
||||
trailing: RaisedButton(
|
||||
child: Text('CONNECT'),
|
||||
color: Colors.black,
|
||||
textColor: Colors.white,
|
||||
onPressed: (result.advertisementData.connectable) ? onTap : null,
|
||||
),
|
||||
children: <Widget>[
|
||||
_buildAdvRow(
|
||||
context, 'Complete Local Name', result.advertisementData.localName),
|
||||
_buildAdvRow(context, 'Tx Power Level',
|
||||
'${result.advertisementData.txPowerLevel ?? 'N/A'}'),
|
||||
_buildAdvRow(
|
||||
context,
|
||||
'Manufacturer Data',
|
||||
getNiceManufacturerData(
|
||||
result.advertisementData.manufacturerData) ??
|
||||
'N/A'),
|
||||
_buildAdvRow(
|
||||
context,
|
||||
'Service UUIDs',
|
||||
(result.advertisementData.serviceUuids.isNotEmpty)
|
||||
? result.advertisementData.serviceUuids.join(', ').toUpperCase()
|
||||
: 'N/A'),
|
||||
_buildAdvRow(context, 'Service Data',
|
||||
getNiceServiceData(result.advertisementData.serviceData) ?? 'N/A'),
|
||||
],
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
class ServiceTile extends StatelessWidget {
|
||||
final BluetoothService service;
|
||||
final List<CharacteristicTile> characteristicTiles;
|
||||
|
||||
const ServiceTile({Key key, this.service, this.characteristicTiles})
|
||||
: super(key: key);
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
if (characteristicTiles.length > 0) {
|
||||
return new ExpansionTile(
|
||||
title: new Column(
|
||||
mainAxisAlignment: MainAxisAlignment.center,
|
||||
crossAxisAlignment: CrossAxisAlignment.start,
|
||||
children: <Widget>[
|
||||
const Text('Service'),
|
||||
new Text(
|
||||
'0x${service.uuid.toString().toUpperCase().substring(4, 8)}',
|
||||
style: Theme.of(context)
|
||||
.textTheme
|
||||
.body1
|
||||
.copyWith(color: Theme.of(context).textTheme.caption.color))
|
||||
],
|
||||
),
|
||||
children: characteristicTiles,
|
||||
);
|
||||
} else {
|
||||
return new ListTile(
|
||||
title: const Text('Service'),
|
||||
subtitle: new Text(
|
||||
'0x${service.uuid.toString().toUpperCase().substring(4, 8)}'),
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
class CharacteristicTile extends StatelessWidget {
|
||||
final BluetoothCharacteristic characteristic;
|
||||
final List<DescriptorTile> descriptorTiles;
|
||||
final VoidCallback onReadPressed;
|
||||
final VoidCallback onWritePressed;
|
||||
final VoidCallback onNotificationPressed;
|
||||
|
||||
const CharacteristicTile(
|
||||
{Key key,
|
||||
this.characteristic,
|
||||
this.descriptorTiles,
|
||||
this.onReadPressed,
|
||||
this.onWritePressed,
|
||||
this.onNotificationPressed})
|
||||
: super(key: key);
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
var actions = new Row(
|
||||
mainAxisSize: MainAxisSize.min,
|
||||
children: <Widget>[
|
||||
new IconButton(
|
||||
icon: new Icon(
|
||||
Icons.file_download,
|
||||
color: Theme.of(context).iconTheme.color.withOpacity(0.5),
|
||||
),
|
||||
onPressed: onReadPressed,
|
||||
),
|
||||
new IconButton(
|
||||
icon: new Icon(Icons.file_upload,
|
||||
color: Theme.of(context).iconTheme.color.withOpacity(0.5)),
|
||||
onPressed: onWritePressed,
|
||||
),
|
||||
new IconButton(
|
||||
icon: new Icon(
|
||||
characteristic.isNotifying ? Icons.sync_disabled : Icons.sync,
|
||||
color: Theme.of(context).iconTheme.color.withOpacity(0.5)),
|
||||
onPressed: onNotificationPressed,
|
||||
)
|
||||
],
|
||||
);
|
||||
|
||||
var title = new Column(
|
||||
mainAxisAlignment: MainAxisAlignment.center,
|
||||
crossAxisAlignment: CrossAxisAlignment.start,
|
||||
children: <Widget>[
|
||||
const Text('Characteristic'),
|
||||
new Text(
|
||||
'0x${characteristic.uuid.toString().toUpperCase().substring(4, 8)}',
|
||||
style: Theme.of(context)
|
||||
.textTheme
|
||||
.body1
|
||||
.copyWith(color: Theme.of(context).textTheme.caption.color))
|
||||
],
|
||||
);
|
||||
|
||||
if (descriptorTiles.length > 0) {
|
||||
return new ExpansionTile(
|
||||
title: new ListTile(
|
||||
title: title,
|
||||
subtitle: new Text(characteristic.value.toString()),
|
||||
contentPadding: EdgeInsets.all(0.0),
|
||||
),
|
||||
trailing: actions,
|
||||
children: descriptorTiles,
|
||||
);
|
||||
} else {
|
||||
return new ListTile(
|
||||
title: title,
|
||||
subtitle: new Text(characteristic.value.toString()),
|
||||
trailing: actions,
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
class DescriptorTile extends StatelessWidget {
|
||||
final BluetoothDescriptor descriptor;
|
||||
final VoidCallback onReadPressed;
|
||||
final VoidCallback onWritePressed;
|
||||
|
||||
const DescriptorTile(
|
||||
{Key key, this.descriptor, this.onReadPressed, this.onWritePressed})
|
||||
: super(key: key);
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
var title = new Column(
|
||||
mainAxisAlignment: MainAxisAlignment.center,
|
||||
crossAxisAlignment: CrossAxisAlignment.start,
|
||||
children: <Widget>[
|
||||
const Text('Descriptor'),
|
||||
new Text(
|
||||
'0x${descriptor.uuid.toString().toUpperCase().substring(4, 8)}',
|
||||
style: Theme.of(context)
|
||||
.textTheme
|
||||
.body1
|
||||
.copyWith(color: Theme.of(context).textTheme.caption.color))
|
||||
],
|
||||
);
|
||||
return new ListTile(
|
||||
title: title,
|
||||
subtitle: new Text(descriptor.value.toString()),
|
||||
trailing: new Row(
|
||||
mainAxisSize: MainAxisSize.min,
|
||||
children: <Widget>[
|
||||
new IconButton(
|
||||
icon: new Icon(
|
||||
Icons.file_download,
|
||||
color: Theme.of(context).iconTheme.color.withOpacity(0.5),
|
||||
),
|
||||
onPressed: onReadPressed,
|
||||
),
|
||||
new IconButton(
|
||||
icon: new Icon(
|
||||
Icons.file_upload,
|
||||
color: Theme.of(context).iconTheme.color.withOpacity(0.5),
|
||||
),
|
||||
onPressed: onWritePressed,
|
||||
)
|
||||
],
|
||||
),
|
||||
);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user