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FinlyticAssets/Services/MqttConnectionService.cs

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+using FinlyticAssets.Util;
+using FinlyticCore.Models;
+
+namespace FinlyticAssets.Services;
+
+/// <summary>
+/// A hosted service responsible for managing the lifecycle of the MQTT client connection
+/// when the application starts up and shuts down.
+/// </summary>
+public class MqttConnectionService : IHostedService
+{
+    private readonly AssetsMqttClient _mqttClient;
+    private readonly IConfiguration _configuration;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="MqttConnectionService"/> class.
+    /// </summary>
+    /// <param name="mqttClient">The MQTT client wrapper instance.</param>
+    /// <param name="configuration">The application configuration provider.</param>
+    public MqttConnectionService(AssetsMqttClient mqttClient, IConfiguration configuration)
+    {
+        _mqttClient = mqttClient;
+        _configuration = configuration;
+    }
+
+    /// <summary>
+    /// Starts the MQTT client connection using settings resolved from configuration.
+    /// </summary>
+    /// <param name="cancellationToken">A token to monitor for cancellation requests.</param>
+    /// <returns>A task representing the asynchronous start operation.</returns>
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        var config = new MqttConfiguration()
+        {
+            Host = _configuration["MQTT__Host"]!,
+            Port = Convert.ToInt32(_configuration["MQTT__Port"]!),
+            ClientId = $"{_configuration["MQTT__ClientId"]!}_{Guid.NewGuid()}"
+        };
+
+        await _mqttClient.ConnectAsync(config);
+    }
+
+    /// <summary>
+    /// Stops and disconnects the MQTT client connection.
+    /// </summary>
+    /// <param name="cancellationToken">A token to monitor for cancellation requests.</param>
+    /// <returns>A task representing the asynchronous stop operation.</returns>
+    public async Task StopAsync(CancellationToken cancellationToken)
+    {
+        await _mqttClient.DisconnectAsync();
+    }
+}