ESP32 | FLUTER | BLE | Data --* Server (feat. JoyPad)

ESP32_Flutter_JoyPad/flutter_app_joypad_ble/lib/main.dart

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+import 'dart:async';
+import 'dart:convert' show utf8;
+
+import 'package:control_pad/control_pad.dart';
+import 'package:control_pad/models/gestures.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_blue/flutter_blue.dart';
+
+Future<void> main() async {
+  await SystemChrome.setPreferredOrientations(
+      [DeviceOrientation.landscapeRight, DeviceOrientation.landscapeLeft]);
+
+  runApp(MainScreen());
+}
+
+class MainScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Joypad with BLE',
+      debugShowCheckedModeBanner: false,
+      home: JoyPad(),
+      theme: ThemeData.dark(),
+    );
+  }
+}
+
+class JoyPad extends StatefulWidget {
+  @override
+  _JoyPadState createState() => _JoyPadState();
+}
+
+class _JoyPadState extends State<JoyPad> {
+  final String SERVICE_UUID = "4fafc201-1fb5-459e-8fcc-c5c9c331914b";
+  final String CHARACTERISTIC_UUID = "beb5483e-36e1-4688-b7f5-ea07361b26a8";
+  final String TARGET_DEVICE_NAME = "ESP32 GET NOTI FROM DEVICE";
+
+  FlutterBlue flutterBlue = FlutterBlue.instance;
+  StreamSubscription<ScanResult> scanSubScription;
+
+  BluetoothDevice targetDevice;
+  BluetoothCharacteristic targetCharacteristic;
+
+  String connectionText = "";
+
+  @override
+  void initState() {
+    super.initState();
+    startScan();
+  }
+
+  startScan() {
+    setState(() {
+      connectionText = "Start Scanning";
+    });
+
+    scanSubScription = flutterBlue.scan().listen((scanResult) {
+      if (scanResult.device.name == TARGET_DEVICE_NAME) {
+        print('DEVICE found');
+        stopScan();
+        setState(() {
+          connectionText = "Found Target Device";
+        });
+
+        targetDevice = scanResult.device;
+        connectToDevice();
+      }
+    }, onDone: () => stopScan());
+  }
+
+  stopScan() {
+    scanSubScription?.cancel();
+    scanSubScription = null;
+  }
+
+  connectToDevice() async {
+    if (targetDevice == null) return;
+
+    setState(() {
+      connectionText = "Device Connecting";
+    });
+
+    await targetDevice.connect();
+    print('DEVICE CONNECTED');
+    setState(() {
+      connectionText = "Device Connected";
+    });
+
+    discoverServices();
+  }
+
+  disconnectFromDevice() {
+    if (targetDevice == null) return;
+
+    targetDevice.disconnect();
+
+    setState(() {
+      connectionText = "Device Disconnected";
+    });
+  }
+
+  discoverServices() async {
+    if (targetDevice == null) return;
+
+    List<BluetoothService> services = await targetDevice.discoverServices();
+    services.forEach((service) {
+      // do something with service
+      if (service.uuid.toString() == SERVICE_UUID) {
+        service.characteristics.forEach((characteristic) {
+          if (characteristic.uuid.toString() == CHARACTERISTIC_UUID) {
+            targetCharacteristic = characteristic;
+            writeData("Hi there, ESP32!!");
+            setState(() {
+              connectionText = "All Ready with ${targetDevice.name}";
+            });
+          }
+        });
+      }
+    });
+  }
+
+  writeData(String data) {
+    if (targetCharacteristic == null) return;
+
+    List<int> bytes = utf8.encode(data);
+    targetCharacteristic.write(bytes);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    JoystickDirectionCallback onDirectionChanged(
+        double degrees, double distance) {
+      String data =
+          "Degree : ${degrees.toStringAsFixed(2)}, distance : ${distance.toStringAsFixed(2)}";
+      print(data);
+      writeData(data);
+    }
+
+    PadButtonPressedCallback padBUttonPressedCallback(
+        int buttonIndex, Gestures gesture) {
+      String data = "buttonIndex : ${buttonIndex}";
+      print(data);
+      writeData(data);
+    }
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(connectionText),
+      ),
+      body: Container(
+        child: targetCharacteristic == null
+            ? Center(
+                child: Text(
+                  "Waiting...",
+                  style: TextStyle(fontSize: 24, color: Colors.red),
+                ),
+              )
+            : Row(
+                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                children: <Widget>[
+                  JoystickView(
+                    onDirectionChanged: onDirectionChanged,
+                  ),
+                  PadButtonsView(
+                    padButtonPressedCallback: padBUttonPressedCallback,
+                  ),
+                ],
+              ),
+      ),
+    );
+  }
+}