public override async Task <MqttMessage> ProcessAsync()
{
if (!Session.IsConnected)
{
Session.Disconnect(Message);
return(null);
}
Session.IncrementKeepAlive();
List <QualityOfServiceLevelType> list = new List <QualityOfServiceLevelType>();
SubscribeMessage msg = Message as SubscribeMessage;
List <string> validSubs = Session.Subscribe(Message);
IEnumerator <KeyValuePair <string, QualityOfServiceLevelType> > en = msg.Topics.GetEnumerator();
while (en.MoveNext())
{
MqttUri uri = new MqttUri(en.Current.Key);
QualityOfServiceLevelType qos = validSubs.Contains(uri.ToString())
? en.Current.Value
: QualityOfServiceLevelType.Failure;
list.Add(qos);
Session.AddQosLevel(uri.Resource, qos);
}
return(await Task.FromResult <MqttMessage>(new SubscriptionAckMessage(Message.MessageId, list)));
}
private void Session_OnUnsubscribe(object sender, MqttMessageEventArgs args)
{
try
{
UnsubscribeMessage msg = (UnsubscribeMessage)args.Message;
foreach (var item in msg.Topics)
{
MqttUri uri = new MqttUri(item.ToLowerInvariant());
if (EventValidator.Validate(false, uri.Resource, Channel, graphManager, context).Validated)
{
adapter.UnsubscribeAsync(uri.Resource).GetAwaiter();
logger?.LogInformationAsync($"MQTT adapter unsubscribed {uri.ToString()}");
}
}
}
catch (Exception ex)
{
logger?.LogErrorAsync(ex, $"MQTT adapter Session_OnUnsubscribe error on channel '{Channel.Id}'.").GetAwaiter();
OnError?.Invoke(this, new ProtocolAdapterErrorEventArgs(Channel.Id, ex));
}
}