How to solve Unhandle Exception:System.Net Socket.SocketException in azure iot readmessage device? - azure

Question

Hi i have the following code, that reads the message to the device. I have azure portal running. But i get the following exception when running on a command prompt;
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using Microsoft.Azure.EventHubs;
using System.Threading.Tasks;
using System.Threading;
using System.Text;
using System.Collections.Generic;
namespace read_d2c_messages
{
class ReadDeviceToCloudMessages
{
// Event Hub-compatible endpoint
// az iot hub show --query properties.eventHubEndpoints.events.endpoint --name {your IoT Hub name}
private readonly static string s_eventHubsCompatibleEndpoint ="sb://iothub-ns-mydeviceco......";
// Event Hub-compatible name
// az iot hub show --query properties.eventHubEndpoints.events.path --name {your IoT Hub name}
private readonly static string s_eventHubsCompatiblePath = "mydeviceconnection";
// az iot hub policy show --name service --query primaryKey --hub-name {your IoT Hub name}
private readonly static string s_iotHubSasKey = "";
private readonly static string s_iotHubSasKeyName = "service";
private static EventHubClient s_eventHubClient;
// Asynchronously create a PartitionReceiver for a partition and then start
// reading any messages sent from the simulated client.
private static async Task ReceiveMessagesFromDeviceAsync(string partition, CancellationToken ct)
{
// Create the receiver using the default consumer group.
// For the purposes of this sample, read only messages sent since
// the time the receiver is created. Typically, you don't want to skip any messages.
var eventHubReceiver = s_eventHubClient.CreateReceiver("$Default", partition, EventPosition.FromEnqueuedTime(DateTime.Now));
Console.WriteLine("Create receiver on partition: " + partition);
while (true)
{
if (ct.IsCancellationRequested) break;
Console.WriteLine("Listening for messages on: " + partition);
// Check for EventData - this methods times out if there is nothing to retrieve.
var events = await eventHubReceiver.ReceiveAsync(100);
// If there is data in the batch, process it.
if (events == null) continue;
foreach(EventData eventData in events)
{
string data = Encoding.UTF8.GetString(eventData.Body.Array);
Console.WriteLine("Message received on partition {0}:", partition);
Console.WriteLine(" {0}:", data);
Console.WriteLine("Application properties (set by device):");
foreach (var prop in eventData.Properties)
{
Console.WriteLine(" {0}: {1}", prop.Key, prop.Value);
}
Console.WriteLine("System properties (set by IoT Hub):");
foreach (var prop in eventData.SystemProperties)
{
Console.WriteLine(" {0}: {1}", prop.Key, prop.Value);
}
}
}
}
private static async Task Main(string[] args)
{
Console.WriteLine("IoT Hub Quickstarts - Read device to cloud messages. Ctrl-C to exit.\n");
// Create an EventHubClient instance to connect to the
// IoT Hub Event Hubs-compatible endpoint.
var connectionString = new EventHubsConnectionStringBuilder(new Uri(s_eventHubsCompatibleEndpoint), s_eventHubsCompatiblePath, s_iotHubSasKeyName, s_iotHubSasKey);
s_eventHubClient = EventHubClient.CreateFromConnectionString(connectionString.ToString());
// Create a PartitionReciever for each partition on the hub.
var runtimeInfo = await s_eventHubClient.GetRuntimeInformationAsync();
var d2cPartitions = runtimeInfo.PartitionIds;
CancellationTokenSource cts = new CancellationTokenSource();
Console.CancelKeyPress += (s, e) =>
{
e.Cancel = true;
cts.Cancel();
Console.WriteLine("Exiting...");
};
var tasks = new List<Task>();
foreach (string partition in d2cPartitions)
{
tasks.Add(ReceiveMessagesFromDeviceAsync(partition, cts.Token));
}
// Wait for all the PartitionReceivers to finsih.
Task.WaitAll(tasks.ToArray());
}
}
}
On my command prompt, the exception is System.Net.Sockets.SocketException:A connection attempt failed because the connected party did not properly respond after a period of time, or established failed because host has failed to respond at Microsoft.Azure.EventHub.Amqp.AmqpHubClient.CreateConnectionAsync(TimeSpan, Timeout); What kind of error is this? Is had to do with firewall connectivity issue on my connection string not to receive message? Or hence i am using Free Trail cant be able to create Service-Bus-Messsage on my EndPoint?

Answer 1

I think the way you construct your connection string is not quite correct. When you copy the connection string from your IoT Hub in the full format, this should already work:
s_eventHubClient = EventHubClient.CreateFromConnectionString("Endpoint=sb://iothub-xxxxxx-1180347-e18a7c8824.servicebus.windows.net/;SharedAccessKeyName=iothubowner;SharedAccessKey=qya62bOiN0********gIyEQ=;EntityPath=myiothubname");