Добавьте файлы проекта.

App.xaml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:SG_Net_Switcher"
+             x:Class="SG_Net_Switcher.App">
+    <Application.Resources>
+        <ResourceDictionary>
+
+            <Color x:Key="PageBackgroundColor">#512bdf</Color>
+            <Color x:Key="PrimaryTextColor">White</Color>
+
+            <Style TargetType="Label">
+                <Setter Property="TextColor" Value="{DynamicResource PrimaryTextColor}" />
+                <Setter Property="FontFamily" Value="OpenSansRegular" />
+            </Style>
+
+            <Style TargetType="Button">
+                <Setter Property="TextColor" Value="{DynamicResource PrimaryTextColor}" />
+                <Setter Property="FontFamily" Value="OpenSansRegular" />
+                <Setter Property="BackgroundColor" Value="#2b0b98" />
+                <Setter Property="Padding" Value="14,10" />
+            </Style>
+
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

App.xaml.cs

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+namespace SG_Net_Switcher
+{
+    public partial class App : Application
+    {
+        public App()
+        {
+            InitializeComponent();
+
+            MainPage = new MainPage();
+        }
+    }
+}

Components/Layout/MainLayout.razor

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+@inherits LayoutComponentBase
+<style>
+     .container-bottom {
+         min-height: 100vh;
+         display: flex;
+         flex-direction: column;
+         justify-content: space-between;
+     }
+</style>
+
+<div class="page container-bottom">
+    <main>
+        <article class="content p-4">
+            @Body
+        </article>
+    </main>
+</div>

Components/Layout/MainLayout.razor.css

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+.page {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+main {
+    flex: 1;
+}
+
+.sidebar {
+    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+}
+
+.top-row {
+    background-color: #f7f7f7;
+    border-bottom: 1px solid #d6d5d5;
+    justify-content: flex-end;
+    height: 3.5rem;
+    display: flex;
+    align-items: center;
+}
+
+    .top-row ::deep a, .top-row ::deep .btn-link {
+        white-space: nowrap;
+        margin-left: 1.5rem;
+        text-decoration: none;
+    }
+
+        .top-row ::deep a:hover, .top-row ::deep .btn-link:hover {
+            text-decoration: underline;
+        }
+
+        .top-row ::deep a:first-child {
+            overflow: hidden;
+            text-overflow: ellipsis;
+        }
+
+@media (max-width: 640.98px) {
+    .top-row {
+        justify-content: space-between;
+    }
+
+        .top-row ::deep a, .top-row ::deep .btn-link {
+            margin-left: 0;
+        }
+}
+
+@media (min-width: 641px) {
+    .page {
+        flex-direction: row;
+    }
+
+    .sidebar {
+        width: 250px;
+        height: 100vh;
+        position: sticky;
+        top: 0;
+    }
+
+    .top-row {
+        position: sticky;
+        top: 0;
+        z-index: 1;
+    }
+
+        .top-row.auth ::deep a:first-child {
+            flex: 1;
+            text-align: right;
+            width: 0;
+        }
+
+    .top-row, article {
+        padding-left: 2rem !important;
+        padding-right: 1.5rem !important;
+    }
+}

Components/Pages/Home.razor

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+@page "/"
+@using SG_Net_Switcher.Services
+@inject NetworkService _networkService
+
+<div class="row m-0 p-0">
+    <div class="col m-0 p-o">
+        <p class="my-1 mx-0">Статус WiFi: @{
+                if (_networkService.IsWifiConnected())
+                {
+                    <span class="text-success">Подключен</span>
+                }
+
+                else
+                {
+                    <span class="text-danger">Не подключен</span>}
+                }
+        </p>
+        <p class="my-1 mx-0">Router IP: @_networkService.GetRouterIp()</p>
+        <p class="my-1 mx-0">My IP: @_networkService.GetMyIp()</p>
+    </div>
+    <div class="col-auto m-0 p-0">
+        <button class="btn btn-link" @onclick="UpdatePage">Обновить</button>
+    </div>
+</div>
+<br />
+<h3 class="display-3 text-center">Переключение интернета</h3>
+<br class="m-2" />
+
+
+<h5 class="display-5 ms-1">Элина</h5>
+<div class="d-grid gap-2">
+    <button class="btn btn-lg btn-success" type="button" disabled="@DisableButtonCheck()" @onclick=@(x=>Sent("inet_elina_on"))>Включить</button>
+    <button class="btn btn-lg btn-danger" type="button" disabled="@DisableButtonCheck()" @onclick=@(x=>Sent("inet_elina_off"))>Отключить</button>
+</div>
+
+<br />
+<br />
+
+<h5 class="display-5 ms-1">Елисей</h5>
+<div class="d-grid gap-2">
+    <button class="btn btn-lg btn-success" type="button" disabled="@DisableButtonCheck()" @onclick=@(x=>Sent("inet_seka_on"))>Включить</button>
+    <button class="btn btn-lg btn-danger" type="button" disabled="@DisableButtonCheck()" @onclick=@(x=>Sent("inet_seka_off"))>Отключить</button>
+</div>
+
+<br class="m-2" />
+@if (!string.IsNullOrEmpty(Result))
+{   
+    <figure class="text-center">
+        <blockquote class="blockquote">
+            @Result
+        </blockquote>
+        <figcaption class="blockquote-footer">
+            Результат
+        </figcaption>
+    </figure>
+}
+
+
+@code {
+    public bool DisableButtonCheck() => !_networkService.IsWifiConnected();
+    public string Result = "";
+
+    public void UpdatePage()
+    {
+        StateHasChanged();
+    }
+
+    public void Sent(string ScriptName)
+    {
+        Result = _networkService.SendCommand(ScriptName);
+    }
+}

MainPage.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:SG_Net_Switcher"
+             x:Class="SG_Net_Switcher.MainPage"
+             BackgroundColor="{DynamicResource PageBackgroundColor}">
+
+    <BlazorWebView x:Name="blazorWebView" HostPage="wwwroot/index.html">
+        <BlazorWebView.RootComponents>
+            <RootComponent Selector="#app" ComponentType="{x:Type local:Routes}" />
+        </BlazorWebView.RootComponents>
+    </BlazorWebView>
+
+</ContentPage>

MainPage.xaml.cs

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+namespace SG_Net_Switcher
+{
+    public partial class MainPage : ContentPage
+    {
+        public MainPage()
+        {
+            InitializeComponent();
+        }
+    }
+}

MauiProgram.cs

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+using Microsoft.Extensions.Logging;
+using SG_Net_Switcher.Services;
+
+namespace SG_Net_Switcher
+{
+    public static class MauiProgram
+    {
+        public static MauiApp CreateMauiApp()
+        {
+            var builder = MauiApp.CreateBuilder();
+            builder
+                .UseMauiApp<App>()
+                .ConfigureFonts(fonts =>
+                {
+                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                });
+
+            builder.Services.AddMauiBlazorWebView();
+
+#if DEBUG
+    		builder.Services.AddBlazorWebViewDeveloperTools();
+    		builder.Logging.AddDebug();
+#endif
+            builder.Services.AddSingleton<NetworkService>();
+
+            return builder.Build();
+        }
+    }
+}

Platforms/Android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="2" android:versionName="PerUserSwitch">
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:supportsRtl="true" android:label="NetSwitcher"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+	<uses-sdk />
+</manifest>

Platforms/Android/DHCP_Service.cs

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+using Android.Content;
+using Android.Net;
+using Android.Net.Wifi;
+using Android.SE.Omapi;
+using Android.Text.Format;
+using SG_Net_Switcher.Platforms.Android;
+using SG_Net_Switcher.Services;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+[assembly: Dependency(typeof(DHCP_Service))]
+namespace SG_Net_Switcher.Platforms.Android
+{
+    public class DHCP_Service : IDHCP_Service
+    {
+        public string GetGatewayIP()
+        {
+            var dhcpInfo = GetDhcpInfo();
+            int gateway = dhcpInfo.Gateway;
+            string gatewayIP = Formatter.FormatIpAddress(gateway);
+            return gatewayIP;
+        }
+
+        public string GetMyIP()
+        {
+            var dhcpInfo = GetDhcpInfo();
+            int MyIp = dhcpInfo.IpAddress;
+            string MyIP = Formatter.FormatIpAddress(MyIp);
+            return MyIP;
+        }
+
+        private DhcpInfo GetDhcpInfo()
+        {
+            WifiManager wifiManager = (WifiManager)global::Android.App.Application.Context.GetSystemService(Context.WifiService);
+            var dhcpInfo = wifiManager.DhcpInfo;
+            return dhcpInfo;
+        }
+    }
+}

Platforms/Android/MainActivity.cs

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+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+
+namespace SG_Net_Switcher
+{
+    [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
+    public class MainActivity : MauiAppCompatActivity
+    {
+    }
+}

Platforms/Android/MainApplication.cs

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+using Android.App;
+using Android.Runtime;
+
+namespace SG_Net_Switcher
+{
+    [Application]
+    public class MainApplication : MauiApplication
+    {
+        public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+            : base(handle, ownership)
+        {
+        }
+
+        protected override MauiApp CreateMauiApp()
+        {
+            var builder = MauiApp.CreateBuilder();
+            builder
+                .UseMauiApp<App>()
+                .ConfigureFonts(fonts =>
+                {
+                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                });
+            builder.Services.AddMauiBlazorWebView();
+
+            // Регистрация сервисов
+            builder.Services.AddSingleton<Services.NetworkService>();
+            builder.Services.AddSingleton<Services.IDHCP_Service, Platforms.Android.DHCP_Service>();
+            return builder.Build();
+        }
+    }
+}

Platforms/Android/Resources/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#512BD4</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

Platforms/MacCatalyst/AppDelegate.cs

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+using Foundation;
+
+namespace SG_Net_Switcher
+{
+    [Register("AppDelegate")]
+    public class AppDelegate : MauiUIApplicationDelegate
+    {
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

Platforms/MacCatalyst/Entitlements.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <!-- See https://aka.ms/maui-publish-app-store#add-entitlements for more information about adding entitlements.-->
+    <dict>
+        <!-- App Sandbox must be enabled to distribute a MacCatalyst app through the Mac App Store. -->
+        <key>com.apple.security.app-sandbox</key>
+        <true/>
+        <!-- When App Sandbox is enabled, this value is required to open outgoing network connections. -->
+        <key>com.apple.security.network.client</key>
+        <true/>
+    </dict>
+</plist>
+