Sending message to IoTHub fails - azure

Question

I have been working on a device which is sending some data to an Azure IoT hub
The device is doing this on two different locations in the code. On one side it works perfectly and I can connect to the Hub via Connection String and transport type MQTT_WebSocket_Only.
public static class Mqtt2IoTNew
{
private static string _DeviceConnectionString = Properties.Settings.Default.MqttUri;
private static TransportType _TransportType = TransportType.Mqtt_WebSocket_Only;
public static void Send(object argEntry, bool argIsList)
{
var deviceClient = DeviceClient.CreateFromConnectionString(_DeviceConnectionString, _TransportType);
deviceClient.ReceiveAsync(TimeSpan.FromSeconds(2)).Wait();
var message = new Message(deviceClient, argEntry, argIsList);
message.RunAsync().GetAwaiter().GetResult();
}
}
internal class Message
{
private DeviceClient _DeviceClient;
private readonly string _Message;
public Message(DeviceClient argDeviceClient, object argEntry, bool isList)
{
_DeviceClient = argDeviceClient;
StringBuilder stb = new StringBuilder();
if (isList)
{
foreach (var entity in (List<object>) argEntry)
{
stb.Append("<entity>").Append(JsonConvert.SerializeObject(entity)).Append("</entity>\n");
}
}
else
{
stb.Append(JsonConvert.SerializeObject(argEntry));
}
_Message = stb.ToString();
}
public async Task RunAsync()
{
await SendEvent().ConfigureAwait(false);
}
private async Task SendEvent()
{
Microsoft.Azure.Devices.Client.Message eventMessage = new Microsoft.Azure.Devices.Client.Message(Encoding.UTF8.GetBytes(_Message));
await _DeviceClient.SendEventAsync(eventMessage).ConfigureAwait(false);
}
}
//Call of method that does not work
protected override void DoOnCompleted(IRepository argRepository)
{
if (_CurrentlySendingTreadId.HasValue)
{
if (_CurrentlySendingTreadId.Value == Thread.CurrentThread.ManagedThreadId)
{
return;
}
}
TaskFactoryProvider.GetFactory().StartNew(()=>SendBatchProtocols());
}
public bool SendBatchProtocols()
{
using (var repository = RepositoryProviderHolder.RepositoryProvider.GetRepository(Constants.CONTAINERCONTRACT_PRODUCTIONREPOSITORY))
{
IQueryable<BatchProtocol> batchProtocolQuery = repository.GetQuery<BatchProtocol>().OrderBy(bp => bp.InternalNoInteger);
batchProtocolQuery = batchProtocolQuery.Where(bp => !bp.IsArchived).Take(1);
if (!batchProtocolQuery.Any()) return false;
var batchProtocols = batchProtocolQuery.ToList();
IsBatchProtocolSend = false;
try
{
foreach (var bps in batchProtocols)
{
Mqtt2IoTNew.Send(bps,false);
}
IsBatchProtocolSend = true;
}
catch (Exception ex)
{
throw;
}
}
return IsBatchProtocolSend;
}
//Call of Method that does work
private void AddEntitiesAndSaveChanges(IEnumerable argEntities)
{
if (argEntities == null)
{
return;
}
lock (_UnderlyingRepositoryAccessLockObject)
{
#region Log2DornerIoT
if (Properties.Settings.Default.Log2DornerIoT)
{
List<object> entities = new List<object>();
int i = 0;
foreach (var entity in argEntities)
{
if (i < 100)
{
entities.Add(entity);
i++;
}
else
{
try
{
Mqtt2IoTNew.Send(entities, true);
}
catch (Exception e)
{
throw;
}
entities.Clear();
i = 0;
}
}
}
}
on the other part of the code, I am only colling the same class to use to send method in the same way but here I get an exception which says "TLS authentication error" and the inner exception "Unable to connect to the remote server", "The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel".
But: I never used any kind of authorization not in the first part which works perfectly neither in the second.
I would be very happy if someone could help me. I have found nothing so fare regarding this issue.
Thanks for your time.
Michael

Answer 1

I found the reason why it didn't work. There was a Persmissice Certificate Policy applied that blocked the certificate at one side of the project. I disabled it and now it works perfectly fine.
Thanks for the help anyway.