// 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)
{
ContinueLooping = true;
// 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));
System.Diagnostics.Debug.WriteLine("Telemetry: Create receiver on partition: " + partition);
OnSvcStatusUpdate?.Invoke("Telemetry: Create receiver on partition: " + partition);
while (ContinueLooping)
{
if (ct.IsCancellationRequested)
{
break;
}
System.Diagnostics.Debug.WriteLine("Telemetry: Listening for messages on: " + partition);
OnSvcStatusUpdate?.Invoke("Telemetry: 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);
System.Diagnostics.Debug.WriteLine("Message received on partition {0}:", partition);
System.Diagnostics.Debug.WriteLine(" {0}:", data);
if (eventData.Properties != null)
{
if (eventData.Properties.Count != 0)
{
System.Diagnostics.Debug.WriteLine("Application properties (set by device):");
foreach (var prop in eventData.Properties)
{
System.Diagnostics.Debug.WriteLine(" {0}: {1}", prop.Key, prop.Value);
}
}
else
{
System.Diagnostics.Debug.WriteLine("No Application Properties (set by device)");
}
}
else
{
System.Diagnostics.Debug.WriteLine("No Application Properties (set by device");
}
if (eventData.SystemProperties != null)
{
if (eventData.SystemProperties.Count != 0)
{
System.Diagnostics.Debug.WriteLine("System properties (set by IoT Hub):");
foreach (var prop in eventData.SystemProperties)
{
System.Diagnostics.Debug.WriteLine(" {0}: {1}", prop.Key, prop.Value);
}
}
else
{
System.Diagnostics.Debug.WriteLine("No System properties from IoT Hub");
}
}
else
{
System.Diagnostics.Debug.WriteLine("No System properties from IoT Hub");
}
OnSvcRecvText?.Invoke(Azure_IoTHub_Telemetry.SyntheticIoTMessage.EventData_ToString(eventData));
}
}
OnSvcStatusUpdate?.Invoke("Telemetry: Exiting - Wait for \"All Threads Done\"");
}
public static void Cancel()
{
OnSvcStatusUpdate?.Invoke("Telemetry - Cancelling");
cts?.Cancel();
ContinueLooping = false;
}
