public async Task <MqttClientSubscribeResult> SubscribeAsync(SubscriptionInfo subscriptionInfo, CancellationToken cancellationToken = default)
{
string topic = subscriptionInfo?.Topic;
_logger.LogInformation($"Subscribing to topic {topic} with {subscriptionInfo?.ConsumerType?.Name}");
var containsKey = _subsManager.HasSubscriptionsForEvent(topic);
if (!containsKey)
{
if (await _mqttPersisterConnection.TryRegisterMessageHandlerAsync(MessageReceivedAsync, cancellationToken))
{
_subsManager.TryAddSubscription(subscriptionInfo);
return(await OnSubscribesAsync(topic, cancellationToken));
}
}
return(null);
}
