Updated from reviewer feedback

src/comm/UDPLink.cc

@@ -291,21 +291,16 @@ bool UDPLink::_hardwareConnect()
     if (_connectState) {
         _socket->joinMulticastGroup(QHostAddress("224.0.0.1"));
         //-- Make sure we have a large enough IO buffers
+
 #ifdef __mobile__
-        _socket->setSocketOption(QAbstractSocket::SendBufferSizeSocketOption,     64 * 1024);
-        if (_udpConfig->isTransmitOnly()) {
-            _socket->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption, 0);
-        } else {
-            _socket->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption, 128 * 1024);
-        }
+        int bufferSizeMultiplier = 1;
 #else
-        _socket->setSocketOption(QAbstractSocket::SendBufferSizeSocketOption,    256 * 1024);
-        if (_udpConfig->isTransmitOnly()) {
-            _socket->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption, 0);;
-        } else {
-            _socket->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption, 512 * 1024);;
-        }
+        int bufferSizeMultiplier = 4;
 #endif
+        int receiveBufferSize = _udpConfig->isTransmitOnly() ? 0 : 512 * 1024;
+        _socket->setSocketOption(QAbstractSocket::SendBufferSizeSocketOption,     bufferSizeMultiplier * 64 * 1024);
+        _socket->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption, bufferSizeMultiplier * receiveBufferSize);
+
         _registerZeroconf(_udpConfig->localPort(), kZeroconfRegistration);
         QObject::connect(_socket, &QUdpSocket::readyRead, this, &UDPLink::readBytes);
         emit connected();

src/ui/preferences/MavlinkSettings.qml

@@ -166,24 +166,22 @@ Rectangle {
                         QGCLabel {
                             width:              _labelWidth
                             anchors.baseline:   mavlinkForwardingHostNameField.baseline
-                            visible:            QGroundControl.settingsManager.appSettings.forwardMavlink.rawValue &&
-                                                QGroundControl.settingsManager.appSettings.forwardMavlink.visible
+                            visible:            QGroundControl.settingsManager.appSettings.forwardMavlink.visible
                             text:               qsTr("Host name:")
                         }
                         FactTextField {
                             id:                     mavlinkForwardingHostNameField
                             fact:                   QGroundControl.settingsManager.appSettings.forwardMavlinkHostName
                             width:                  _valueWidth
-                            visible:                QGroundControl.settingsManager.appSettings.forwardMavlink.rawValue &&
-                                                    QGroundControl.settingsManager.appSettings.forwardMavlink.visible
+                            visible:                QGroundControl.settingsManager.appSettings.forwardMavlink.visible
+                            enabled:                QGroundControl.settingsManager.appSettings.forwardMavlink.rawValue
                             anchors.verticalCenter: parent.verticalCenter
                         }
 
                     }
                    QGCLabel {
                         text:       qsTr("<i> Changing the host name requires restart of application. </i>")
-                        visible:    QGroundControl.settingsManager.appSettings.forwardMavlink.rawValue &&
-                                    QGroundControl.settingsManager.appSettings.forwardMavlink.visible
+                        visible:    QGroundControl.settingsManager.appSettings.forwardMavlink.visible
                     }
                 }
             }