File indexing completed on 2024-05-19 15:01:37

 /***************************************************************************
 File        : MQTTClient.cpp
 Project     : LabPlot
 Description : Represents a MQTT Client
 --------------------------------------------------------------------
 Copyright   : (C) 2018 Kovacs Ferencz (kferike98@gmail.com)
 
 ***************************************************************************/
 
 /***************************************************************************
 *                                                                         *
 *  This program is free software; you can redistribute it and/or modify   *
 *  it under the terms of the GNU General Public License as published by   *
 *  the Free Software Foundation; either version 2 of the License, or      *
 *  (at your option) any later version.                                    *
 *                                                                         *
 *  This program is distributed in the hope that it will be useful,        *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *  GNU General Public License for more details.                           *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
 *   Boston, MA  02110-1301  USA                                           *
 *                                                                         *
 ***************************************************************************/
 #include "backend/datasources/MQTTClient.h"
 #include "backend/datasources/MQTTSubscription.h"
 #include "backend/datasources/MQTTTopic.h"
 #include "backend/datasources/filters/AsciiFilter.h"
 #include "kdefrontend/datasources/MQTTErrorWidget.h"
 
 #include <QTimer>
 
 /*!
   \class MQTTClient
   \brief The MQTT Client connects to the broker set in ImportFileWidget.
 It manages the MQTTSubscriptions, and the MQTTTopics.
 
   \ingroup datasources
 */
 MQTTClient::MQTTClient(const QString& name) : Folder(name, AspectType::MQTTClient),
     m_updateTimer(new QTimer(this)),
     m_client(new QMqttClient(this)),
     m_willTimer(new QTimer(this)) {
 
     connect(m_updateTimer, &QTimer::timeout, this, &MQTTClient::read);
     connect(m_client, &QMqttClient::connected, this, &MQTTClient::onMQTTConnect);
     connect(m_willTimer, &QTimer::timeout, this, &MQTTClient::updateWillMessage);
     connect(m_client, &QMqttClient::errorChanged, this, &MQTTClient::MQTTErrorChanged);
 }
 
 MQTTClient::~MQTTClient() {
     emit clientAboutToBeDeleted(m_client->hostname(), m_client->port());
     //stop reading before deleting the objects
     pauseReading();
     qDebug() << "Delete MQTTClient: " << m_client->hostname() << m_client->port();
 
     delete m_filter;
     delete m_updateTimer;
     delete m_willTimer;
     m_client->disconnectFromHost();
     delete m_client;
 }
 
 /*!
  * depending on the update type, periodically or on data changes, starts the timer.
  */
 void MQTTClient::ready() {
     if (m_updateType == UpdateType::TimeInterval)
         m_updateTimer->start(m_updateInterval);
 }
 
 /*!
  * \brief Updates the MQTTTopics of the client
  */
 void MQTTClient::updateNow() {
     m_updateTimer->stop();
     read();
     if ((m_updateType == UpdateType::TimeInterval) && !m_paused)
         m_updateTimer->start(m_updateInterval);
 }
 
 /*!
  * \brief Continue reading from messages after it was paused.
  */
 void MQTTClient::continueReading() {
     m_paused = false;
     if (m_updateType == UpdateType::TimeInterval)
         m_updateTimer->start(m_updateInterval);
 }
 
 /*!
  * \brief Pause the reading from messages.
  */
 void MQTTClient::pauseReading() {
     m_paused = true;
     if (m_updateType == UpdateType::TimeInterval)
         m_updateTimer->stop();
 }
 
 /*!
  * \brief Sets the filter of the MQTTClient.
  * The ownership of the filter is passed to MQTTClient.
  *
  * \param f a pointer to the new filter
  */
 void MQTTClient::setFilter(AsciiFilter* f) {
     delete m_filter;
     m_filter = f;
 }
 
 /*!
  * \brief Returns the filter of the MQTTClient.
  */
 AsciiFilter* MQTTClient::filter() const {
     return m_filter;
 }
 
 /*!
  * \brief Sets the MQTTclient's update interval to \c interval
  * \param interval
  */
 void MQTTClient::setUpdateInterval(int interval) {
     m_updateInterval = interval;
     if (!m_paused)
         m_updateTimer->start(m_updateInterval);
 }
 
 /*!
  * \brief Returns the MQTTClient's update interval to \c interval
  * \param interval
  */
 int MQTTClient::updateInterval() const {
     return m_updateInterval;
 }
 
 /*!
  * \brief Sets how many values we should store
  * \param keepNValues
  */
 void MQTTClient::setKeepNValues(int keepNValues) {
     m_keepNValues = keepNValues;
 }
 
 /*!
  * \brief Returns how many values we should store
  */
 int MQTTClient::keepNValues() const {
     return m_keepNValues;
 }
 
 /*!
  * \brief Provides information about whether the reading is paused or not
  *
  * \return true if the reading is paused
  * \return false otherwise
  */
 bool MQTTClient::isPaused() const {
     return m_paused;
 }
 
 /*!
  * \brief Sets the size rate to sampleSize
  * \param sampleSize
  */
 void MQTTClient::setSampleSize(int sampleSize) {
     m_sampleSize = sampleSize;
 }
 
 /*!
  * \brief Returns the size rate
  */
 int MQTTClient::sampleSize() const {
     return m_sampleSize;
 }
 
 /*!
  * \brief Sets the MQTTClient's reading type to readingType
  * \param readingType
  */
 void MQTTClient::setReadingType(ReadingType readingType) {
     m_readingType = readingType;
 }
 
 /*!
  * \brief Returns the MQTTClient's reading type
  */
 MQTTClient::ReadingType MQTTClient::readingType() const {
     return m_readingType;
 }
 
 /*!
  * \brief Sets the MQTTClient's update type to updatetype and handles this change
  * \param updatetype
  */
 void MQTTClient::setUpdateType(UpdateType updateType) {
     if (updateType == UpdateType::NewData)
         m_updateTimer->stop();
 
     m_updateType = updateType;
 }
 
 /*!
  * \brief Returns the MQTTClient's update type
  */
 MQTTClient::UpdateType MQTTClient::updateType() const {
     return m_updateType;
 }
 
 /*!
  * \brief Returns the MQTTClient's icon
  */
 QIcon MQTTClient::icon() const {
     return QIcon::fromTheme("network-server-database");
 }
 
 /*!
  * \brief Sets the host and port for the client.
  *
  * \param host the hostname of the broker we want to connect to
  * \param port the port used by the broker
  */
 void MQTTClient::setMQTTClientHostPort(const QString& host, quint16 port) {
     m_client->setHostname(host);
     m_client->setPort(port);
 }
 
 /*!
  * \brief Returns hostname of the broker the client is connected to.
  */
 QString MQTTClient::clientHostName() const {
     return m_client->hostname();
 }
 
 /*!
  * \brief Returns the port used by the broker.
  */
 quint16 MQTTClient::clientPort() const {
     return m_client->port();
 }
 
 /*!
  * \brief Sets the flag on the given value.
  * If set true it means that the broker requires authentication, otherwise it doesn't.
  *
  * \param use
  */
 void MQTTClient::setMQTTUseAuthentication(bool use) {
     m_MQTTUseAuthentication = use;
 }
 
 /*!
  * \brief Returns whether the broker requires authentication or not.
  */
 bool MQTTClient::MQTTUseAuthentication() const {
     return m_MQTTUseAuthentication;
 }
 
 /*!
  * \brief Sets the username and password for the client.
  *
  * \param username the username used for authentication
  * \param password the password used for authentication
  */
 void MQTTClient::setMQTTClientAuthentication(const QString& username, const QString& password) {
     m_client->setUsername(username);
     m_client->setPassword(password);
 }
 
 /*!
  * \brief Returns the username used for authentication.
  */
 QString MQTTClient::clientUserName() const {
     return m_client->username();
 }
 
 /*!
  * \brief Returns the password used for authentication.
  */
 QString MQTTClient::clientPassword() const {
     return m_client->password();
 }
 
 /*!
  * \brief Sets the flag on the given value.
  * If set true it means that user wants to set the client ID, otherwise it's not the case.
  *
  * \param use
  */
 void MQTTClient::setMQTTUseID(bool use) {
     m_MQTTUseID = use;
 }
 
 /*!
  * \brief Returns whether the user wants to set the client ID or not.
  */
 bool MQTTClient::MQTTUseID() const {
     return m_MQTTUseID;
 }
 
 /*!
  * \brief Sets the ID of the client
  *
  * \param id
  */
 void MQTTClient::setMQTTClientId(const QString& clientId) {
     m_client->setClientId(clientId);
 }
 
 /*!
  * \brief Returns the ID of the client
  */
 QString MQTTClient::clientID () const {
     return m_client->clientId();
 }
 
 /*!
  * \brief Sets the flag on the given value.
  * If retain is true we interpret retain messages, otherwise we do not
  *
  * \param retain
  */
 void MQTTClient::setMQTTRetain(bool retain) {
     m_MQTTRetain = retain;
 }
 
 /*!
  * \brief Returns the flag, which set to true means that interpret retain messages, otherwise we do not
  */
 bool MQTTClient::MQTTRetain() const {
     return m_MQTTRetain;
 }
 
 /*!
  * \brief Returns the name of every MQTTTopics which already received a message, and is child of the MQTTClient
  */
 QVector<QString> MQTTClient::topicNames() const {
     return m_topicNames;
 }
 
 /*!
  * \brief Adds the initial subscriptions that were set in ImportFileWidget
  *
  * \param filter the name of the subscribed topic
  * \param qos the qos level of the subscription
  */
 void MQTTClient::addInitialMQTTSubscriptions(const QMqttTopicFilter& filter, quint8 qos) {
     m_subscribedTopicNameQoS[filter] = qos;
 }
 
 /*!
  * \brief Returns the name of every MQTTSubscription of the MQTTClient
  */
 QVector<QString> MQTTClient::MQTTSubscriptions() const {
     return m_subscriptions;
 }
 
 /*!
  * \brief Adds a new MQTTSubscription to the MQTTClient
  *
  * \param topic, the name of the topic
  * \param QoS
  */
 void MQTTClient::addMQTTSubscription(const QString& topicName, quint8 QoS) {
     //Check whether the subscription already exists, if it doesn't, we can add it
     if (!m_subscriptions.contains(topicName)) {
         const QMqttTopicFilter filter {topicName};
         QMqttSubscription* temp = m_client->subscribe(filter, QoS);
 
         if (temp) {
 //          qDebug()<<"Subscribe to: "<< temp->topic() << "  " << temp->qos();
             m_subscriptions.push_back(temp->topic().filter());
             m_subscribedTopicNameQoS[temp->topic().filter()] = temp->qos();
 
             auto* newSubscription = new MQTTSubscription(temp->topic().filter());
             newSubscription->setMQTTClient(this);
 
             addChildFast(newSubscription);
             m_MQTTSubscriptions.push_back(newSubscription);
 
             //Search for inferior subscriptions, that the new subscription contains
             bool found = false;
             QVector<MQTTSubscription*> inferiorSubscriptions;
             for (auto* subscription : m_MQTTSubscriptions) {
                 if (checkTopicContains(topicName, subscription->subscriptionName())
                         && topicName != subscription->subscriptionName()) {
                     found = true;
                     inferiorSubscriptions.push_back(subscription);
                 }
             }
 
             //If there are some inferior subscriptions, we have to deal with them
             if (found) {
                 for (auto* inferiorSubscription : inferiorSubscriptions) {
 //                  qDebug()<<"Reparent topics of inferior subscription: "<< inferiorSubscription->subscriptionName();
 
                     //We have to reparent every topic of the inferior subscription, so no data is lost
                     QVector<MQTTTopic*> topics = inferiorSubscription->topics();
                     for (auto* topic : topics) {
                         topic->reparent(newSubscription);
                     }
 
                     //Then remove the subscription and every connected information
                     QMqttTopicFilter unsubscribeFilter {inferiorSubscription->subscriptionName()};
                     m_client->unsubscribe(unsubscribeFilter);
 
                     for (int j = 0; j < m_MQTTSubscriptions.size(); ++j) {
                         if (m_MQTTSubscriptions[j]->subscriptionName() ==
                                 inferiorSubscription->subscriptionName()) {
                             m_MQTTSubscriptions.remove(j);
                         }
                     }
                     m_subscriptions.removeAll(inferiorSubscription->subscriptionName());
                     m_subscribedTopicNameQoS.remove(inferiorSubscription->subscriptionName());
 
                     removeChild(inferiorSubscription);
                 }
             }
 
             connect(temp, &QMqttSubscription::messageReceived, this, &MQTTClient::MQTTSubscriptionMessageReceived);
 
             emit MQTTTopicsChanged();
         }
     }
 }
 
 /*!
  * \brief Removes a MQTTSubscription from the MQTTClient
  *
  * \param name, the name of the subscription to remove
  */
 void MQTTClient::removeMQTTSubscription(const QString& subscriptionName) {
     //We can only remove the subscription if it exists
     if (m_subscriptions.contains(subscriptionName)) {
         //unsubscribe from the topic
         const QMqttTopicFilter filter{subscriptionName};
         m_client->unsubscribe(filter);
 //      qDebug()<<"Unsubscribe from: " << subscriptionName;
 
         //Remove every connected information
         m_subscriptions.removeAll(subscriptionName);
 
         for (int i = 0; i < m_MQTTSubscriptions.size(); ++i) {
             if (m_MQTTSubscriptions[i]->subscriptionName() == subscriptionName) {
                 MQTTSubscription* removeSubscription = m_MQTTSubscriptions[i];
                 m_MQTTSubscriptions.remove(i);
                 //Remove every topic of the subscription as well
                 QVector<MQTTTopic*> topics = removeSubscription->topics();
                 for (const auto& topic : topics)
                     m_topicNames.removeAll(topic->topicName());
 
                 //Remove the MQTTSubscription
                 removeChild(removeSubscription);
                 break;
             }
         }
 
         QMapIterator<QMqttTopicFilter, quint8> j(m_subscribedTopicNameQoS);
         while (j.hasNext()) {
             j.next();
             if (j.key().filter() == subscriptionName) {
                 m_subscribedTopicNameQoS.remove(j.key());
                 break;
             }
         }
         emit MQTTTopicsChanged();
     }
 }
 
 /*!
  * \brief Adds a MQTTSubscription to the MQTTClient
  *Used when the user unsubscribes from a topic of a MQTTSubscription
  *
  * \param topic, the name of the topic
  * \param QoS
  */
 void MQTTClient::addBeforeRemoveSubscription(const QString& topicName, quint8 QoS) {
     //We can't add the subscription if it already exists
     if (!m_subscriptions.contains(topicName)) {
         //Subscribe to the topic
         QMqttTopicFilter filter {topicName};
         QMqttSubscription* temp = m_client->subscribe(filter, QoS);
         if (temp) {
             //Add the MQTTSubscription and other connected data
 //          qDebug()<<"Add subscription before remove: " << temp->topic() << "  " << temp->qos();
             m_subscriptions.push_back(temp->topic().filter());
             m_subscribedTopicNameQoS[temp->topic().filter()] = temp->qos();
 
             auto* newSubscription = new MQTTSubscription(temp->topic().filter());
             newSubscription->setMQTTClient(this);
 
             addChildFast(newSubscription);
             m_MQTTSubscriptions.push_back(newSubscription);
 
             //Search for the subscription the topic belonged to
             bool found = false;
             MQTTSubscription* superiorSubscription = nullptr;
             for (auto* subscription : m_MQTTSubscriptions) {
                 if (checkTopicContains(subscription->subscriptionName(), topicName)
                         && topicName != subscription->subscriptionName()) {
                     found = true;
                     superiorSubscription = subscription;
                     break;
                 }
             }
 
             if (found) {
                 //Search for topics belonging to the superior(old) subscription
                 //which are also contained by the new subscription
                 QVector<MQTTTopic*> topics = superiorSubscription->topics();
 //              qDebug()<< topics.size();
 
                 QVector<MQTTTopic*> inferiorTopics;
                 for (auto* topic : topics) {
                     if (checkTopicContains(topicName, topic->topicName())) {
                         inferiorTopics.push_back(topic);
                     }
                 }
 
                 //Reparent these topics, in order to avoid data loss
                 for (auto* inferiorTopic : inferiorTopics) {
                     inferiorTopic->reparent(newSubscription);
                 }
             }
             connect(temp, &QMqttSubscription::messageReceived, this, &MQTTClient::MQTTSubscriptionMessageReceived);
         }
     }
 }
 
 /*!
  * \brief Reparents the given MQTTTopic to the given MQTTSubscription
  *
  * \param topic, the name of the MQTTTopic
  * \param parent, the name of the MQTTSubscription
  */
 void MQTTClient::reparentTopic(const QString& topicName, const QString& parentTopicName) {
     //We can only reparent if the parent containd the topic
     if (m_subscriptions.contains(parentTopicName) && m_topicNames.contains(topicName)) {
 //      qDebug() << "Reparent " << topicName << " to " << parentTopicName;
         //search for the parent MQTTSubscription
         bool found = false;
         MQTTSubscription* superiorSubscription = nullptr;
         for (auto* subscription : m_MQTTSubscriptions) {
             if (subscription->subscriptionName() == parentTopicName) {
                 found = true;
                 superiorSubscription = subscription;
                 break;
             }
         }
 
         if (found) {
             //get every topic of the MQTTClient
             QVector<MQTTTopic*> topics = children<MQTTTopic>(AbstractAspect::ChildIndexFlag::Recursive);
             //Search for the given topic among the MQTTTopics
             for (auto* topic : topics) {
                 if (topicName == topic->topicName()) {
                     //if found, it is reparented to the parent MQTTSubscription
                     topic->reparent(superiorSubscription);
                     break;
                 }
             }
         }
     }
 }
 
 /*!
  *\brief Checks if a topic contains another one
  *
  * \param superior the name of a topic
  * \param inferior the name of a topic
  * \return  true if superior is equal to or contains(if superior contains wildcards) inferior,
  *          false otherwise
  */
 bool MQTTClient::checkTopicContains(const QString& superior, const QString& inferior) {
     if (superior == inferior)
         return true;
     else {
         if (superior.contains(QLatin1String("/"))) {
             QStringList superiorList = superior.split('/', QString::SkipEmptyParts);
             QStringList inferiorList = inferior.split('/', QString::SkipEmptyParts);
 
             //a longer topic can't contain a shorter one
             if (superiorList.size() > inferiorList.size())
                 return false;
 
             bool ok = true;
             for (int i = 0; i < superiorList.size(); ++i) {
                 if (superiorList.at(i) != inferiorList.at(i)) {
                     if ((superiorList.at(i) != '+') &&
                             !(superiorList.at(i) == '#' && i == superiorList.size() - 1)) {
                         //if the two topics differ, and the superior's current level isn't + or #(which can be only in the last position)
                         //then superior can't contain inferior
                         ok = false;
                         break;
                     } else if (i == superiorList.size() - 1 && (superiorList.at(i) == '+' && inferiorList.at(i) == '#') ) {
                         //if the two topics differ at the last level
                         //and the superior's current level is + while the inferior's is #(which can be only in the last position)
                         //then superior can't contain inferior
                         ok = false;
                         break;
                     }
                 }
             }
             return ok;
         }
         return false;
     }
 }
 
 /*!
  *\brief Returns the '+' wildcard containing topic name, which includes the given topic names
  *
  * \param first the name of a topic
  * \param second the name of a topic
  * \return The name of the common topic, if it exists, otherwise an empty string
  */
 QString MQTTClient::checkCommonLevel(const QString& first, const QString& second) {
     QStringList firstList = first.split('/', QString::SkipEmptyParts);
     QStringList secondtList = second.split('/', QString::SkipEmptyParts);
     QString commonTopic;
 
     if (!firstList.isEmpty()) {
         //the two topics have to be the same size and can't be identic
         if ((firstList.size() == secondtList.size()) && (first != second)) {
 
             //the index where they differ
             int differIndex = -1;
             for (int i = 0; i < firstList.size(); ++i) {
                 if (firstList.at(i) != secondtList.at(i)) {
                     differIndex = i;
                     break;
                 }
             }
 
             //they can differ at only one level and that can't be the first
             bool differ = false;
             if (differIndex > 0) {
                 for (int j = differIndex +1; j < firstList.size(); ++j) {
                     if (firstList.at(j) != secondtList.at(j)) {
                         differ = true;
                         break;
                     }
                 }
             }
             else
                 differ = true;
 
             if (!differ) {
                 for (int i = 0; i < firstList.size(); ++i) {
                     if (i != differIndex) {
                         commonTopic.append(firstList.at(i));
                     } else {
                         //we put '+' wildcard at the level where they differ
                         commonTopic.append('+');
                     }
 
                     if (i != firstList.size() - 1)
                         commonTopic.append("/");
                 }
             }
         }
     }
 //  qDebug() << first << " " << second << " common topic: "<<commonTopic;
     return commonTopic;
 }
 
 void MQTTClient::setWillSettings(const MQTTWill& settings) {
     m_MQTTWill = settings;
 }
 
 MQTTClient::MQTTWill MQTTClient::willSettings() const {
     return m_MQTTWill;
 }
 
 /*!
  * \brief Sets whether the user wants to use will message or not
  *
  * \param use
  */
 void MQTTClient::setMQTTWillUse(bool use) {
     m_MQTTWill.enabled = use;
     if (use == false)
         m_willTimer->stop();
 }
 
 /*!
  * \brief Returns whether the user wants to use will message or not
  */
 bool MQTTClient::MQTTWillUse() const {
     return m_MQTTWill.enabled;
 }
 
 /*!
  * \brief Sets the will topic of the client
  *
  * \param topic
  */
 void  MQTTClient::setWillTopic(const QString& topic) {
 //  qDebug() << "Set will topic:" << topic;
     m_MQTTWill.willTopic = topic;
 }
 
 /*!
  * \brief Returns the will topic of the client
  */
 QString MQTTClient::willTopic() const {
     return m_MQTTWill.willTopic;
 }
 
 /*!
  * \brief Sets the retain flag of the client's will message
  *
  * \param retain
  */
 void MQTTClient::setWillRetain(bool retain) {
     m_MQTTWill.willRetain = retain;
 }
 
 /*!
  * \brief Returns the retain flag of the client's will message
  */
 bool MQTTClient::willRetain() const {
     return m_MQTTWill.willRetain;
 }
 
 /*!
  * \brief Sets the QoS level of the client's will message
  *
  * \param QoS
  */
 void MQTTClient::setWillQoS(quint8 QoS) {
     m_MQTTWill.willQoS = QoS;
 }
 
 /*!
  * \brief Returns the QoS level of the client's will message
  */
 quint8 MQTTClient::willQoS() const {
     return m_MQTTWill.willQoS;
 }
 
 /*!
  * \brief Sets the will message type of the client
  *
  * \param messageType
  */
 void MQTTClient::setWillMessageType(WillMessageType messageType) {
     m_MQTTWill.willMessageType = messageType;
 }
 
 /*!
  * \brief Returns the will message type of the client
  */
 MQTTClient::WillMessageType MQTTClient::willMessageType() const {
     return m_MQTTWill.willMessageType;
 }
 
 /*!
  * \brief Sets the own will message of the user
  *
  * \param ownMessage
  */
 void MQTTClient::setWillOwnMessage(const QString& ownMessage) {
     m_MQTTWill.willOwnMessage = ownMessage;
 }
 
 /*!
  * \brief Returns the own will message of the user
  */
 QString MQTTClient::willOwnMessage() const {
     return m_MQTTWill.willOwnMessage;
 }
 
 /*!
  * \brief Updates the will message of the client
  */
 void MQTTClient::updateWillMessage() {
     QVector<const MQTTTopic*> topics = children<const MQTTTopic>(AbstractAspect::ChildIndexFlag::Recursive);
     const MQTTTopic* willTopic = nullptr;
 
     //Search for the will topic
     for (const auto* topic : topics) {
         if (topic->topicName() == m_MQTTWill.willTopic) {
             willTopic = topic;
             break;
         }
     }
 
     //if the will topic is found we can update the will message
     if (willTopic != nullptr) {
         //To update the will message we have to disconnect first, then after setting everything connect again
         if (m_MQTTWill.enabled && (m_client->state() == QMqttClient::ClientState::Connected) ) {
             //Disconnect only once (disconnecting may take a while)
             if (!m_disconnectForWill) {
 //              qDebug() << "Disconnecting from host in order to update will message";
                 m_client->disconnectFromHost();
                 m_disconnectForWill = true;
             }
             //Try to update again
             updateWillMessage();
         }
         //If client is disconnected we can update the settings
         else if (m_MQTTWill.enabled && (m_client->state() == QMqttClient::ClientState::Disconnected) && m_disconnectForWill) {
             m_client->setWillQoS(m_MQTTWill.willQoS);
             m_client->setWillRetain(m_MQTTWill.willRetain);
             m_client->setWillTopic(m_MQTTWill.willTopic);
 
             //Set the will message according to m_willMessageType
             switch (m_MQTTWill.willMessageType) {
             case WillMessageType::OwnMessage:
                 m_client->setWillMessage(m_MQTTWill.willOwnMessage.toUtf8());
 //              qDebug()<<"Will own message" << m_MQTTWill.willOwnMessage;
                 break;
             case WillMessageType::Statistics: {
                 //Statistics is only possible if the data stored in the MQTTTopic is of type integer or numeric
                 //check the column mode of the last column in the topic for this.
                 //TODO: check this logic again - why last column only?
                 const auto* col = willTopic->child<Column>(willTopic->childCount<Column>() - 1);
                 auto mode = col->columnMode();
                 if (mode == AbstractColumn::ColumnMode::Integer || mode == AbstractColumn::ColumnMode::Numeric)
                     m_client->setWillMessage(this->statistics(willTopic).toUtf8());
                 else
                     m_client->setWillMessage(QByteArray()); //empty message
 //                  qDebug() << "Will statistics message: "<< QString(m_client->willMessage());
                 break;
             }
             case WillMessageType::LastMessage:
                 m_client->setWillMessage(m_MQTTWill.willLastMessage.toUtf8());
 //              qDebug()<<"Will last message:\n" << m_MQTTWill.willLastMessage;
                 break;
             default:
                 break;
             }
             m_disconnectForWill = false;
             //Reconnect with the updated message
             m_client->connectToHost();
 //          qDebug()<< "Reconnect to host after updating will message";
         }
     }
 }
 
 /*!
  * \brief Returns the statistical data that is needed by the topic for its MQTTClient's will message
  * \param topic
  */
 QString MQTTClient::statistics(const MQTTTopic* topic) const {
     const auto* col = topic->child<Column>(topic->childCount<Column>() - 1);
     QString statistics;
 
     QVector<bool> willStatistics = topic->mqttClient()->willStatistics();
     //Add every statistical data to the string, the flag of which is set true
     for (int i = 0; i <= willStatistics.size(); i++) {
         if (willStatistics[i]) {
             switch (static_cast<MQTTClient::WillStatisticsType>(i) ) {
             case MQTTClient::WillStatisticsType::ArithmeticMean:
                 statistics += QLatin1String("Arithmetic mean: ") + QString::number(col->statistics().arithmeticMean) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::ContraharmonicMean:
                 statistics += QLatin1String("Contraharmonic mean: ") + QString::number(col->statistics().contraharmonicMean) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::Entropy:
                 statistics += QLatin1String("Entropy: ") + QString::number(col->statistics().entropy) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::GeometricMean:
                 statistics += QLatin1String("Geometric mean: ") + QString::number(col->statistics().geometricMean) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::HarmonicMean:
                 statistics += QLatin1String("Harmonic mean: ") + QString::number(col->statistics().harmonicMean) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::Kurtosis:
                 statistics += QLatin1String("Kurtosis: ") + QString::number(col->statistics().kurtosis) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::Maximum:
                 statistics += QLatin1String("Maximum: ") + QString::number(col->statistics().maximum) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::MeanDeviation:
                 statistics += QLatin1String("Mean deviation: ") + QString::number(col->statistics().meanDeviation) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::MeanDeviationAroundMedian:
                 statistics += QLatin1String("Mean deviation around median: ") + QString::number(col->statistics().meanDeviationAroundMedian) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::Median:
                 statistics += QLatin1String("Median: ") + QString::number(col->statistics().median) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::MedianDeviation:
                 statistics += QLatin1String("Median deviation: ") + QString::number(col->statistics().medianDeviation) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::Minimum:
                 statistics += QLatin1String("Minimum: ") + QString::number(col->statistics().minimum) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::Skewness:
                 statistics += QLatin1String("Skewness: ") + QString::number(col->statistics().skewness) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::StandardDeviation:
                 statistics += QLatin1String("Standard deviation: ") + QString::number(col->statistics().standardDeviation) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::Variance:
                 statistics += QLatin1String("Variance: ") + QString::number(col->statistics().variance) + "\n";
                 break;
             case MQTTClient::WillStatisticsType::NoStatistics:
             default:
                 break;
             }
         }
     }
     return statistics;
 }
 
 /*!
  * \brief Returns the MQTTClient's will update type
  */
 MQTTClient::WillUpdateType MQTTClient::willUpdateType() const {
     return m_MQTTWill.willUpdateType;
 }
 
 /*!
  * \brief Sets the MQTTClient's will update type
  *
  * \param willUpdateType
  */
 void MQTTClient::setWillUpdateType(WillUpdateType willUpdateType) {
     m_MQTTWill.willUpdateType = willUpdateType;
 }
 
 /*!
  * \brief Returns the time interval of updating the MQTTClient's will message
  */
 int MQTTClient::willTimeInterval() const {
     return m_MQTTWill.willTimeInterval;
 }
 
 /*!
  * \brief Sets the time interval of updating the MQTTClient's will message, if update type is TimePeriod
  *
  * \param interval
  */
 void MQTTClient::setWillTimeInterval(int interval) {
     m_MQTTWill.willTimeInterval = interval;
 }
 
 /*!
  * \brief Clear the lastly received message by the will topic
  * Called when the will topic is changed
  */
 void MQTTClient::clearLastMessage() {
     m_MQTTWill.willLastMessage.clear();
 }
 
 /*!
  * \brief Sets true the corresponding flag of the statistic type,
  *  what means that the given statistic type will be added to the will message
  *
  * \param statistics
  */
 void MQTTClient::addWillStatistics(WillStatisticsType statistic) {
     m_MQTTWill.willStatistics[static_cast<int>(statistic)] = true;
 }
 
 /*!
  * \brief Sets false the corresponding flag of the statistic type,
  * what means that the given statistic will no longer be added to the will message
  *
  * \param statistics
  */
 void MQTTClient::removeWillStatistics(WillStatisticsType statistic) {
     m_MQTTWill.willStatistics[static_cast<int>(statistic)] = false;
 }
 
 /*!
  * \brief Returns a bool vector, meaning which statistic types are included in the will message
  * If the corresponding value is true, the statistic type is included, otherwise it isn't
  */
 QVector<bool> MQTTClient::willStatistics() const {
     return m_MQTTWill.willStatistics;
 }
 
 /*!
  * \brief Starts the will timer, which will update the will message
  */
 void MQTTClient::startWillTimer() const {
     if (m_MQTTWill.willUpdateType == WillUpdateType::TimePeriod)
         m_willTimer->start(m_MQTTWill.willTimeInterval);
 }
 
 /*!
  * \brief Stops the will timer
  */
 void MQTTClient::stopWillTimer() const {
     m_willTimer->stop();
 }
 
 //##############################################################################
 //#################################  SLOTS  ####################################
 //##############################################################################
 
 /*!
  *\brief called periodically when update type is TimeInterval
  */
 void MQTTClient::read() {
     if (!m_filter)
         return;
 
     if (!m_prepared) {
 //      qDebug()<<"Connect";
         //connect to the broker
         m_client->connectToHost();
         m_prepared = true;
     }
 
     if ((m_client->state() == QMqttClient::ClientState::Connected) && m_MQTTFirstConnectEstablished) {
 //      qDebug()<<"Read";
         //Signal for every MQTTTopic that they can read
         emit readFromTopics();
     }
 }
 
 /*!
  *\brief called when the client successfully connected to the broker
  */
 void MQTTClient::onMQTTConnect() {
     if (m_client->error() == QMqttClient::NoError) {
         //if this is the first connection (after setting the options in ImportFileWidget or loading saved project)
         if (!m_MQTTFirstConnectEstablished) {
 //          qDebug()<<"connection made in MQTTClient";
 
             //Subscribe to initial or loaded topics
             QMapIterator<QMqttTopicFilter, quint8> i(m_subscribedTopicNameQoS);
             while (i.hasNext()) {
                 i.next();
 //              qDebug()<<i.key();
                 QMqttSubscription *temp = m_client->subscribe(i.key(), i.value());
                 if (temp) {
                     //If we didn't load the MQTTClient from xml we have to add the MQTTSubscriptions
                     if (!m_loaded) {
                         m_subscriptions.push_back(temp->topic().filter());
 
                         auto* newSubscription = new MQTTSubscription(temp->topic().filter());
                         newSubscription->setMQTTClient(this);
 
                         addChildFast(newSubscription);
 
                         m_MQTTSubscriptions.push_back(newSubscription);
                     }
 
                     connect(temp, &QMqttSubscription::messageReceived, this, &MQTTClient::MQTTSubscriptionMessageReceived);
                 }
             }
             m_MQTTFirstConnectEstablished = true;
             //Signal that the initial subscriptions were made
             emit MQTTSubscribed();
         }
         //if there was already a connection made(happens after updating will message)
         else {
 //          qDebug() << "Start resubscribing after will message update";
             //Only the client has to make the subscriptions again, every other connected data is still available
             QMapIterator<QMqttTopicFilter, quint8> i(m_subscribedTopicNameQoS);
             while (i.hasNext()) {
                 i.next();
                 QMqttSubscription* temp = m_client->subscribe(i.key(), i.value());
                 if (temp) {
 //                  qDebug()<<temp->topic()<<"  "<<temp->qos();
                     connect(temp, &QMqttSubscription::messageReceived, this, &MQTTClient::MQTTSubscriptionMessageReceived);
                 }
 //              else
 //                  qDebug()<<"Couldn't subscribe after will update";
             }
         }
     }
 }
 
 /*!
  *\brief called when a message is received by a topic belonging to one of subscriptions of the client.
  * It passes the message to the appropriate MQTTSubscription which will pass it to the appropriate MQTTTopic
  */
 void MQTTClient::MQTTSubscriptionMessageReceived(const QMqttMessage& msg) {
     //Decide to interpret retain message or not
     if (!msg.retain() || m_MQTTRetain) {
         //If this is the first message from the topic, save its name
         if (!m_topicNames.contains(msg.topic().name()))
             m_topicNames.push_back(msg.topic().name());
 
         //Pass the message and the topic name to the MQTTSubscription which contains the topic
         for (auto* subscription : m_MQTTSubscriptions) {
             if (checkTopicContains(subscription->subscriptionName(), msg.topic().name())) {
                 subscription->messageArrived(msg.payload(), msg.topic().name());
                 break;
             }
         }
 
         //if the message was received by the will topic, update the last message received by it
         if (msg.topic().name() == m_MQTTWill.willTopic) {
             m_MQTTWill.willLastMessage = QString(msg.payload());
 
             emit MQTTTopicsChanged();
         }
     }
 }
 
 /*!
  *\brief Handles some of the possible errors of the client, using MQTTErrorWidget
  */
 void MQTTClient::MQTTErrorChanged(QMqttClient::ClientError clientError) {
     if (clientError != QMqttClient::ClientError::NoError) {
         auto* errorWidget = new MQTTErrorWidget(clientError, this);
         errorWidget->show();
     }
 }
 
 /*!
  *\brief Called when a subscription is loaded.
  * Checks whether every saved subscription was loaded or not.
  * If everything is loaded, it makes the connection and starts the reading
  *
  * \param name, the name of the subscription
  */
 void MQTTClient::subscriptionLoaded(const QString &name) {
     if (!name.isEmpty()) {
 //      qDebug() << "Finished loading: " << name;
         //Save information about the subscription
         m_subscriptionsLoaded++;
         m_subscriptions.push_back(name);
         QMqttTopicFilter filter {name};
         m_subscribedTopicNameQoS[filter] = 0;
 
         //Save the topics belonging to the subscription
         for (const auto* subscription : m_MQTTSubscriptions) {
             if (subscription->subscriptionName() == name) {
                 const auto& topics = subscription->topics();
                 for (auto* topic : topics) {
                     m_topicNames.push_back(topic->topicName());
                 }
                 break;
             }
         }
 
         //Check whether every subscription was loaded or not
         if (m_subscriptionsLoaded == m_subscriptionCountToLoad) {
             //if everything was loaded we can start reading
             m_loaded = true;
             read();
         }
     }
 }
 
 //##############################################################################
 //##################  Serialization/Deserialization  ###########################
 //##############################################################################
 /*!
   Saves as XML.
  */
 void MQTTClient::save(QXmlStreamWriter* writer) const {
     writer->writeStartElement("MQTTClient");
     writeBasicAttributes(writer);
     writeCommentElement(writer);
 
     //general
     writer->writeStartElement("general");
     writer->writeAttribute("subscriptionCount", QString::number(m_MQTTSubscriptions.size()));
     writer->writeAttribute("updateType", QString::number(static_cast<int>(m_updateType)));
     writer->writeAttribute("readingType", QString::number(static_cast<int>(m_readingType)));
     writer->writeAttribute("keepValues", QString::number(m_keepNValues));
 
     if (m_updateType == UpdateType::TimeInterval)
         writer->writeAttribute("updateInterval", QString::number(m_updateInterval));
 
     if (m_readingType != ReadingType::TillEnd)
         writer->writeAttribute("sampleSize", QString::number(m_sampleSize));
 
     writer->writeAttribute("host", m_client->hostname());
     writer->writeAttribute("port", QString::number(m_client->port()));
     writer->writeAttribute("username", m_client->username());
     writer->writeAttribute("password", m_client->password());
     writer->writeAttribute("clientId", m_client->clientId());
     writer->writeAttribute("useRetain", QString::number(m_MQTTRetain));
     writer->writeAttribute("useWill", QString::number(m_MQTTWill.enabled));
     writer->writeAttribute("willTopic", m_MQTTWill.willTopic);
     writer->writeAttribute("willOwnMessage", m_MQTTWill.willOwnMessage);
     writer->writeAttribute("willQoS", QString::number(m_MQTTWill.willQoS));
     writer->writeAttribute("willRetain", QString::number(m_MQTTWill.willRetain));
     writer->writeAttribute("willMessageType", QString::number(static_cast<int>(m_MQTTWill.willMessageType)));
     writer->writeAttribute("willUpdateType", QString::number(static_cast<int>(m_MQTTWill.willUpdateType)));
     writer->writeAttribute("willTimeInterval", QString::number(m_MQTTWill.willTimeInterval));
 
     for (int i = 0; i < m_MQTTWill.willStatistics.count(); ++i)
         writer->writeAttribute("willStatistics"+QString::number(i), QString::number(m_MQTTWill.willStatistics[i]));
     writer->writeAttribute("useID", QString::number(m_MQTTUseID));
     writer->writeAttribute("useAuthentication", QString::number(m_MQTTUseAuthentication));
 
     writer->writeEndElement();
 
     //filter
     m_filter->save(writer);
 
     //MQTTSubscription
     for (auto* sub : children<MQTTSubscription>(AbstractAspect::ChildIndexFlag::IncludeHidden))
         sub->save(writer);
 
     writer->writeEndElement(); // "MQTTClient"
 }
 
 /*!
   Loads from XML.
 */
 bool MQTTClient::load(XmlStreamReader* reader, bool preview) {
     if (!readBasicAttributes(reader))
         return false;
 
     QString attributeWarning = i18n("Attribute '%1' missing or empty, default value is used");
     QXmlStreamAttributes attribs;
     QString str;
 
     while (!reader->atEnd()) {
         reader->readNext();
         if (reader->isEndElement() && reader->name() == "MQTTClient")
             break;
 
         if (!reader->isStartElement())
             continue;
 
         if (reader->name() == "comment") {
             if (!readCommentElement(reader))
                 return false;
         } else if (reader->name() == "general") {
             attribs = reader->attributes();
 
             str = attribs.value("subscriptionCount").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'subscriptionCount'"));
             else
                 m_subscriptionCountToLoad =  str.toInt();
 
             str = attribs.value("keepValues").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'keepValues'"));
             else
                 m_keepNValues =  str.toInt();
 
             str = attribs.value("updateType").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'updateType'"));
             else
                 m_updateType =  static_cast<UpdateType>(str.toInt());
 
             str = attribs.value("readingType").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'readingType'"));
             else
                 m_readingType =  static_cast<ReadingType>(str.toInt());
 
             if (m_updateType == UpdateType::TimeInterval) {
                 str = attribs.value("updateInterval").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'updateInterval'"));
                 else
                     m_updateInterval = str.toInt();
             }
 
             if (m_readingType != ReadingType::TillEnd) {
                 str = attribs.value("sampleSize").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'sampleSize'"));
                 else
                     m_sampleSize = str.toInt();
             }
 
             str = attribs.value("host").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'host'"));
             else
                 m_client->setHostname(str);
 
             str = attribs.value("port").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'port'"));
             else
                 m_client->setPort(str.toUInt());
 
             str = attribs.value("useAuthentication").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'useAuthentication'"));
             else
                 m_MQTTUseAuthentication = str.toInt();
 
             if (m_MQTTUseAuthentication) {
                 str = attribs.value("username").toString();
                 if (!str.isEmpty())
                     m_client->setUsername(str);
 
                 str = attribs.value("password").toString();
                 if (!str.isEmpty())
                     m_client->setPassword(str);
             }
 
             str = attribs.value("useID").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'useID'"));
             else
                 m_MQTTUseID = str.toInt();
 
             if (m_MQTTUseID) {
                 str = attribs.value("clientId").toString();
                 if (!str.isEmpty())
                     m_client->setClientId(str);
             }
 
             str = attribs.value("useRetain").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'useRetain'"));
             else
                 m_MQTTRetain = str.toInt();
 
             str = attribs.value("useWill").toString();
             if (str.isEmpty())
                 reader->raiseWarning(attributeWarning.arg("'useWill'"));
             else
                 m_MQTTWill.enabled = str.toInt();
 
             if (m_MQTTWill.enabled) {
                 str = attribs.value("willTopic").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'willTopic'"));
                 else
                     m_MQTTWill.willTopic = str;
 
                 str = attribs.value("willOwnMessage").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'willOwnMessage'"));
                 else
                     m_MQTTWill.willOwnMessage = str;
 
                 str = attribs.value("willQoS").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'willQoS'"));
                 else
                     m_MQTTWill.willQoS = str.toUInt();
 
                 str = attribs.value("willRetain").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'willRetain'"));
                 else
                     m_MQTTWill.willRetain = str.toInt();
 
                 str = attribs.value("willMessageType").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'willMessageType'"));
                 else
                     m_MQTTWill.willMessageType = static_cast<MQTTClient::WillMessageType>(str.toInt());
 
                 str = attribs.value("willUpdateType").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'willUpdateType'"));
                 else
                     m_MQTTWill.willUpdateType = static_cast<MQTTClient::WillUpdateType>(str.toInt());
 
                 str = attribs.value("willTimeInterval").toString();
                 if (str.isEmpty())
                     reader->raiseWarning(attributeWarning.arg("'willTimeInterval'"));
                 else
                     m_MQTTWill.willTimeInterval = str.toInt();
 
                 for (int i = 0; i < m_MQTTWill.willStatistics.count(); ++i) {
                     str = attribs.value("willStatistics"+QString::number(i)).toString();
                     if (str.isEmpty())
                         reader->raiseWarning(attributeWarning.arg("'willTimeInterval'"));
                     else
                         m_MQTTWill.willStatistics[i] = str.toInt();
                 }
             }
         } else if (reader->name() == "asciiFilter") {
             setFilter(new AsciiFilter);
             if (!m_filter->load(reader))
                 return false;
         } else if (reader->name() == "MQTTSubscription") {
             auto* subscription = new MQTTSubscription(QString());
             subscription->setMQTTClient(this);
             m_MQTTSubscriptions.push_back(subscription);
             connect(subscription, &MQTTSubscription::loaded, this, &MQTTClient::subscriptionLoaded);
             if (!subscription->load(reader, preview)) {
                 delete subscription;
                 return false;
             }
             addChildFast(subscription);
         } else {// unknown element
             reader->raiseWarning(i18n("unknown element '%1'", reader->name().toString()));
             if (!reader->skipToEndElement()) return false;
         }
     }
 
     return !reader->hasError();
 }