public void OnMqttMsgSubscribeReceived(MqttClientConnection clientConnection, ushort messageId, string[] topics, byte[] qosLevels)
{
var wasSubscribed = false;
for (var i = 0; i < topics.Length; i++)
{
if (uacManager.AuthenticateSubscriber(clientConnection, topics[i]))
{
// TODO : business logic to grant QoS levels based on some conditions ?
// now the broker granted the QoS levels requested by client
// subscribe client for each topic and QoS level requested
MqttSubscriberManager.Subscribe(topics[i], qosLevels[i], clientConnection);
wasSubscribed = true;
}
}
if (wasSubscribed)
{
// send SUBACK message to the client
MqttOutgoingMessageManager.Suback(clientConnection, messageId, qosLevels);
foreach (var topic in topics)
{
// publish retained message on the current subscription
RetainedMessageManager.PublishRetaind(topic, clientConnection);
}
}
}