flutter_serial_communication 0.1.0

This library aims to ease Flutter Developers to do serial communcation with their peripherals without too much hassle. Currently supports Android USB (OTG) to communicate with Arduinos and other USB s [...]

example/lib/main.dart

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_serial_communication/flutter_serial_communication.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _flutterSerialCommunicationPlugin = FlutterSerialCommunication();
  bool isConnected = false;
  List<String> connectedDevices = [];

  @override
  void initState() {
    super.initState();

    _flutterSerialCommunicationPlugin
        .getSerialMessageListener()
        .receiveBroadcastStream()
        .listen((event) {
      debugPrint("Received From Native:  $event");
    });

    _flutterSerialCommunicationPlugin
        .getDeviceConnectionListener()
        .receiveBroadcastStream()
        .listen((event) {
      setState(() {
        isConnected = event;
      });
    });
  }

  _getAllConnectedDevicedButtonPressed() async {
    List<String> newConnectedDevices =
        await _flutterSerialCommunicationPlugin.getAvailableDevices() ?? [];
    setState(() {
      connectedDevices = newConnectedDevices;
    });
  }

  _connectButtonPressed(int index) async {
    bool isConnectionSuccess =
        await _flutterSerialCommunicationPlugin.connect(index, 115200);
    debugPrint("Is Connection Success:  $isConnectionSuccess");
  }

  _disconnectButtonPressed() async {
    await _flutterSerialCommunicationPlugin.disconnect();
  }

  _sendMessageButtonPressed() async {
    bool isMessageSent = await _flutterSerialCommunicationPlugin
        .write(Uint8List.fromList([0xBB, 0x00, 0x22, 0x00, 0x00, 0x22, 0x7E]));
    debugPrint("Is Message Sent:  $isMessageSent");
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Flutter Serial Communication Example App'),
        ),
        body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            children: [
              Text("Is Connected: $isConnected"),
              const SizedBox(height: 16.0),
              FilledButton(
                onPressed: _getAllConnectedDevicedButtonPressed,
                child: const Text("Get All Connected Devices"),
              ),
              const SizedBox(height: 16.0),
              ...connectedDevices.asMap().entries.map((entry) {
                return Row(
                  children: [
                    Flexible(child: Text(entry.value)),
                    const SizedBox(width: 16.0),
                    FilledButton(
                      onPressed: () {
                        _connectButtonPressed(entry.key);
                      },
                      child: const Text("Connect"),
                    ),
                  ],
                );
              }).toList(),
              const SizedBox(height: 16.0),
              FilledButton(
                onPressed: isConnected ? _disconnectButtonPressed : null,
                child: const Text("Disconnect"),
              ),
              const SizedBox(height: 16.0),
              FilledButton(
                onPressed: isConnected ? _sendMessageButtonPressed : null,
                child: const Text("Send Message To Connected Device"),
              ),
            ],
          ),
        ),
      ),
    );
  }
}