Azure IoT Hub Connection

Onur Coşkun 20

Hello,
I am using Azure IoT Hub for my sensor project. Since .net 8 release i wanted to update my code from .net 6 to .net 8 but after updating my code it takes about solid 1 minute to connect to IoT Hub it was 2-3 seconds in .net 6.

Sander van de Velde 29,456 Reputation points MVP

2024-02-16T18:28:25.91+00:00

Hello @Onur Coşkun, welcome to this moderated Azure community forum. Better questions with more information lead to better answers from our community members. Please provide information about which SDK you are using, the steps you have taken, the guide you follow, and any other information that could be helpful.

Onur Coşkun 20

Okay i have wrote a simple code for example using 8.0.101 sdk. Only using Microsoft.Azure.Devices.Client version 1.42.2 library. It tooks so long to connect to iot hub. On the other than the same code connects to iot hub within a second using 6.0.419 sdk.

using Microsoft.Azure.Devices.Client;

namespace azuretest;

public class Service : BackgroundService
{
    private DeviceClient deviceClient;
    private readonly string connectionString = "hubconnectionstring";

    public Service()
    {
    }
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        List<Task> tasks = [StartHub(stoppingToken)];
        await Task.WhenAll(tasks);
        while (!stoppingToken.IsCancellationRequested)
        {
            await Console.Out.WriteLineAsync("hello");
            await Task.Delay(TimeSpan.FromSeconds(5), stoppingToken);
        }
    }

    private async Task StartHub(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            deviceClient = DeviceClient.CreateFromConnectionString(connectionString, TransportType.Mqtt);
            await deviceClient.OpenAsync(stoppingToken);
            await Console.Out.WriteLineAsync("Connectted.");
            break;
        }
    }
}

using azuretest;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddHostedService<Service>();

var app = builder.Build();

app.MapGet("/", () => "Hello World!");

app.Run();

Accepted answer

Sander van de Velde 29,456 Reputation points MVP

2024-02-17T16:23:18.4+00:00

Hello @Onur Coşkun,

welcome to this moderated Azure community forum.

Based on your code example, I reduced it to just a console app:

It's based on .Net 8 LTS:

This way, the device clients connects within a fraction of a second.

It seems the Azure IoT Device SDK is not the root cause of your issue.

Please check first how your BackgroundService performs without the Device client connection.

If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.
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Onur Coşkun 20 Reputation points

2024-02-17T16:27:11.2866667+00:00

Thank you for your answer. I think the problem is TransportType.Mqtt beacuse that is how i created my DeviceClient as you can see in my code.

Sander van de Velde 29,456 Reputation points MVP

2024-02-17T19:39:29.1933333+00:00

Yes, that could be the challenge. It will try to connect both over TCP and over Websockets. I recommend MQTT over Websockets because this means less discussion with the person monitoring with the outbound firewall.
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