/// <summary>
/// This method is called whenever the module is sent a message from the EdgeHub.
/// It just pipe the messages without any change.
/// It prints all the incoming messages.
/// </summary>
static async Task <MessageResponse> PipeMessage(Message message, object userContext)
{
var moduleClient = userContext as ModuleClient;
if (moduleClient == null)
{
throw new InvalidOperationException("UserContext doesn't contain " + "expected values");
}
// Handle messages from leaf devices
if (message.Properties.Keys.Contains(LeafDeviceIdPropertyName))
{
DeviceInfo leafDevice;
string leafDeviceId = message.Properties[LeafDeviceIdPropertyName];
// Register the leaf device if not already registered
if (!_leafDevices.Contains(leafDeviceId))
{
// Not registered yet, so start new registration
leafDevice = _leafDevices.GetOrAdd(leafDeviceId);
if (leafDevice.Status == DeviceInfoStatus.New)
{
await RegisterLeafDevice(moduleClient, leafDevice, message.Properties[LeafDeviceModuleIdPropertyName]);
}
}
// Add message from leaf device to cache if not yet registered, otherwise pipe to IoTHub
leafDevice = _leafDevices.Get(leafDeviceId);
var leafDeviceMessage = CloneMessage(message);
if (_cacheMessagesDuringRegistration && leafDevice.TryAddToWaitingList(leafDeviceMessage))
{
Console.WriteLine($"Adding message from leaf device '{leafDeviceId}' on waiting list while waiting for registration completion.");
}
else if (leafDevice.Status == DeviceInfoStatus.Registered)
{
try {
Console.WriteLine($"Sending message from leaf device '{leafDeviceId}' to IoTHub.");
await leafDevice.DeviceClient.SendEventAsync(leafDeviceMessage);
}
catch (Microsoft.Azure.Devices.Client.Exceptions.UnauthorizedException ex) {
Console.WriteLine($"ERROR: Leaf defice '{leafDeviceId}' unauthorized while sending event to IoTHub: {ex.Message}.");
}
finally {
leafDeviceMessage.Dispose();
}
}
}
else
{
// Not a leaf device message so just pipe message to output
using (var pipeMessage = CloneMessage(message))
{
Console.WriteLine($"Pipe message from (non-leaf) device.");
await moduleClient.SendEventAsync("itmoutput", pipeMessage);
}
}
return(MessageResponse.Completed);
}