openiothub_gateway_service 是一个用于 Flutter 的插件，主要用于与物联网（IoT）网关进行通信。它提供了一种简单的方式来管理和控制连接到网关的设备，以及处理来自这些设备的数据。

安装插件

首先，你需要在 pubspec.yaml 文件中添加 openiothub_gateway_service 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  openiothub_gateway_service: ^0.0.1  # 请使用最新版本

然后运行 flutter pub get 来安装插件。

基本使用

1. 初始化插件

在使用插件之前，你需要初始化它。通常，你可以在 main.dart 中进行初始化：

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await OpenIoTHubGatewayService.initialize();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter IoT Gateway',
      home: HomeScreen(),
    );
  }
}

2. 连接到物联网网关

你可以使用 OpenIoTHubGatewayService 来连接到物联网网关。通常，你需要提供网关的 IP 地址和端口号：

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

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  bool _isConnected = false;

  Future<void> _connectToGateway() async {
    try {
      await OpenIoTHubGatewayService.connect('192.168.1.100', 8080);
      setState(() {
        _isConnected = true;
      });
    } catch (e) {
      print('Failed to connect to gateway: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('IoT Gateway'),
      ),
      body: Center(
        child: _isConnected
            ? Text('Connected to Gateway')
            : ElevatedButton(
                onPressed: _connectToGateway,
                child: Text('Connect to Gateway'),
              ),
      ),
    );
  }
}

3. 发送和接收数据

一旦连接到网关，你可以使用 sendData 和 receiveData 方法来发送和接收数据：

Future<void> _sendData() async {
  try {
    await OpenIoTHubGatewayService.sendData('Hello Gateway');
    print('Data sent successfully');
  } catch (e) {
    print('Failed to send data: $e');
  }
}

Future<void> _receiveData() async {
  try {
    String data = await OpenIoTHubGatewayService.receiveData();
    print('Received data: $data');
  } catch (e) {
    print('Failed to receive data: $e');
  }
}

4. 断开连接

当你不再需要连接到网关时，可以调用 disconnect 方法来断开连接：

Future<void> _disconnectFromGateway() async {
  try {
    await OpenIoTHubGatewayService.disconnect();
    setState(() {
      _isConnected = false;
    });
  } catch (e) {
    print('Failed to disconnect from gateway: $e');
  }
}

处理设备管理

openiothub_gateway_service 插件还提供了管理连接到网关的设备的功能。你可以获取设备列表、添加或删除设备等。

获取设备列表

Future<void> _getDeviceList() async {
  try {
    List<Device> devices = await OpenIoTHubGatewayService.getDeviceList();
    for (var device in devices) {
      print('Device ID: ${device.id}, Name: ${device.name}');
    }
  } catch (e) {
    print('Failed to get device list: $e');
  }
}

添加设备

Future<void> _addDevice() async {
  try {
    Device newDevice = Device(id: '123', name: 'New Device');
    await OpenIoTHubGatewayService.addDevice(newDevice);
    print('Device added successfully');
  } catch (e) {
    print('Failed to add device: $e');
  }
}

删除设备

Future<void> _removeDevice(String deviceId) async {
  try {
    await OpenIoTHubGatewayService.removeDevice(deviceId);
    print('Device removed successfully');
  } catch (e) {
    print('Failed to remove device: $e');
  }
}