Backward compatible with Qt 5.12

Author: wh201906

README.md

@@ -50,7 +50,7 @@ You can download pre-built binaries in [release](https://github.com/wh201906/Ser
 ### 1. Install depencencies
 ```
 sudo apt-get update
-sudo apt-get install qt5-default libqt5serialport5 libqt5serialport5-dev 
+sudo apt-get install qt5-default libqt5serialport5 libqt5serialport5-dev qtconnectivity5-dev 
 ```
 ### 2. Get the source code
 ```

src/connection.cpp

@@ -272,7 +272,13 @@ void Connection::open()
             m_BLERxTxMode = BLE_2S2C;
         else
             m_BLERxTxMode = m_currBTArgument.RxCharacteristicUUID == m_currBTArgument.TxCharacteristicUUID ? BLE_1S1C : BLE_1S2C;
+        if(m_BLEController != nullptr)
+            m_BLEController->deleteLater();
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+        m_BLEController = new QLowEnergyController(m_currBTArgument.deviceAddress, m_currBTArgument.localAdapterAddress);
+#else
         m_BLEController = QLowEnergyController::createCentral(m_currBTArgument.deviceAddress, m_currBTArgument.localAdapterAddress);
+#endif
         connect(m_BLEController, &QLowEnergyController::connected, m_BLEController, &QLowEnergyController::discoverServices);
         connect(m_BLEController, QOverload<QLowEnergyController::Error>::of(&QLowEnergyController::error), this, &Connection::onErrorOccurred);
         connect(m_BLEController, &QLowEnergyController::serviceDiscovered, this, &Connection::BLEC_onServiceDiscovered);
@@ -459,7 +465,11 @@ void Connection::updateSignalSlot()
     else if(m_type == TCP_Client)
     {
         m_lastReadyReadConn = connect(m_TCPSocket, &QIODevice::readyRead, this, &Connection::onReadyRead);
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+        m_lastOnErrorConn = connect(m_TCPSocket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), this, &Connection::onErrorOccurred);
+#else
         m_lastOnErrorConn = connect(m_TCPSocket, &QAbstractSocket::errorOccurred, this, &Connection::onErrorOccurred);
+#endif
         m_lastOnConnectedConn = connect(m_TCPSocket, &QAbstractSocket::connected, this, &Connection::onConnected);
         m_lastOnDisconnectedConn = connect(m_TCPSocket, &QAbstractSocket::disconnected, this, &Connection::onDisconnected);
     }
@@ -472,7 +482,11 @@ void Connection::updateSignalSlot()
     else if(m_type == UDP)
     {
         m_lastReadyReadConn = connect(m_UDPSocket, &QIODevice::readyRead, this, &Connection::onReadyRead);
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+        m_lastOnErrorConn = connect(m_UDPSocket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), this, &Connection::onErrorOccurred);
+#else
         m_lastOnErrorConn = connect(m_UDPSocket, &QAbstractSocket::errorOccurred, this, &Connection::onErrorOccurred);
+#endif
         m_lastOnConnectedConn = connect(m_UDPSocket, &QAbstractSocket::connected, this, &Connection::onConnected);
         m_lastOnDisconnectedConn = connect(m_UDPSocket, &QAbstractSocket::disconnected, this, &Connection::onDisconnected);
     }
@@ -849,7 +863,11 @@ void Connection::Server_onClientConnected()
         changeState(Connected);
         connect(socket, &QTcpSocket::readyRead, this, &Connection::onReadyRead);
         connect(socket, &QTcpSocket::disconnected, this, &Connection::Server_onClientDisconnected);
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+        connect(socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), this, &Connection::onErrorOccurred);
+#else
         connect(socket, &QAbstractSocket::errorOccurred, this, &Connection::onErrorOccurred);
+#endif
         m_TCPConnectedClients.append(socket);
         m_TCPTxClients.append(socket);
         emit TCP_clientConnected();

src/devicetab.cpp

@@ -1230,7 +1230,11 @@ void DeviceTab::on_BLEC_connectButton_clicked()
         ui->BLEC_UUIDList->clear();
         ui->BLEC_connectButton->setText(tr("Disconnect"));
         ui->BLEC_currAddrLabel->setText(ui->BLEC_currAddrBox->currentText());
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+        m_BLEController = new QLowEnergyController(QBluetoothAddress(ui->BLEC_currAddrBox->currentText()), QBluetoothAddress(ui->BLEC_adapterBox->currentData().toString()));
+#else
         m_BLEController = QLowEnergyController::createCentral(QBluetoothAddress(ui->BLEC_currAddrBox->currentText()), QBluetoothAddress(ui->BLEC_adapterBox->currentData().toString()));
+#endif
         connect(m_BLEController, &QLowEnergyController::connected, m_BLEController, &QLowEnergyController::discoverServices);
         connect(m_BLEController, QOverload<QLowEnergyController::Error>::of(&QLowEnergyController::error), [ = ](QLowEnergyController::Error newError)
         {