// TODO: decide how to call this
public void ackReceived(long messageID) {
// Remove if received acknowledgment message id contains in retained message list.
retainedMessageList.remove(messageID);
}
// TODO: decide how to call this
public void ackReceived(long messageID) {
// Remove if received acknowledgment message id contains in retained message list.
retainedMessageList.remove(messageID);
}