Program.cs

using Microsoft.EntityFrameworkCore;
using Smart_Sensor_Hub.Hubs;
using Smart_Sensor_Hub.Models;
using Smart_Sensor_Hub.Services;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllersWithViews();
builder.Services.AddDbContext<AppDbContext>(options =>
    options.UseSqlite("Data Source=smartshub.db"));
builder.Services.AddSignalR();
builder.Services.AddHostedService<MqttListenerService>();

var app = builder.Build();

using (var scope = app.Services.CreateScope())
{
    var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
    db.Database.EnsureCreated();
}

if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.MapHub<SensorHub>("/sensorHub");

app.Run();