diff --git a/plugins/feature/remotecontrol/remotecontroldevicedialog.cpp b/plugins/feature/remotecontrol/remotecontroldevicedialog.cpp
index ee737ba51..446306df0 100644
--- a/plugins/feature/remotecontrol/remotecontroldevicedialog.cpp
+++ b/plugins/feature/remotecontrol/remotecontroldevicedialog.cpp
@@ -162,6 +162,7 @@ void RemoteControlDeviceDialog::enableWidgets()
 
 void RemoteControlDeviceDialog::controlSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
 {
+    (void)deselected;
     bool arrowsEnabled = (selected.indexes().size() > 0);
     bool editEnabled = arrowsEnabled && (ui->protocol->currentText() == "VISA");
 
@@ -173,6 +174,7 @@ void RemoteControlDeviceDialog::controlSelectionChanged(const QItemSelection &se
 
 void RemoteControlDeviceDialog::sensorSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
 {
+    (void)deselected;
     bool arrowsEnabled = (selected.indexes().size() > 0);
     bool editEnabled = arrowsEnabled && (ui->protocol->currentText() == "VISA");
 
@@ -419,8 +421,6 @@ void RemoteControlDeviceDialog::on_controlEdit_clicked()
         RemoteControlVISAControlDialog dialog(m_settings, m_rcDevice, control, false);
         if (dialog.exec() == QDialog::Accepted)
         {
-            DeviceDiscoverer::DeviceInfo *info = &m_deviceInfo[ui->device->currentIndex()];
-
             ui->controls->item(row, COL_NAME)->setText(control->m_name);
             ui->controls->item(row, COL_UNITS)->setText(control->m_units);
             ui->controls->item(row, COL_ID)->setText(control->m_id);
@@ -430,6 +430,7 @@ void RemoteControlDeviceDialog::on_controlEdit_clicked()
 
 void RemoteControlDeviceDialog::on_controls_cellDoubleClicked(int row, int column)
 {
+    (void)row;
     if ((ui->protocol->currentText() == "VISA") && (column <= COL_ID)) {
         on_controlEdit_clicked();
     }
@@ -547,8 +548,6 @@ void RemoteControlDeviceDialog::on_sensorEdit_clicked()
         RemoteControlVISASensorDialog dialog(m_settings, m_rcDevice, sensor, false);
         if (dialog.exec() == QDialog::Accepted)
         {
-            DeviceDiscoverer::DeviceInfo *info = &m_deviceInfo[ui->device->currentIndex()];
-
             ui->sensors->item(row, COL_NAME)->setText(sensor->m_name);
             ui->sensors->item(row, COL_ID)->setText(sensor->m_id);
             ui->sensors->item(row, COL_UNITS)->setText(sensor->m_units);
@@ -558,6 +557,7 @@ void RemoteControlDeviceDialog::on_sensorEdit_clicked()
 
 void RemoteControlDeviceDialog::on_sensors_cellDoubleClicked(int row, int column)
 {
+    (void)row;
     if ((ui->protocol->currentText() == "VISA") && (column <= COL_ID)) {
         on_sensorEdit_clicked();
     }
diff --git a/plugins/feature/remotecontrol/remotecontrolgui.cpp b/plugins/feature/remotecontrol/remotecontrolgui.cpp
index 02ecdb314..648505f15 100644
--- a/plugins/feature/remotecontrol/remotecontrolgui.cpp
+++ b/plugins/feature/remotecontrol/remotecontrolgui.cpp
@@ -471,6 +471,7 @@ void RemoteControlGUI::createControls(RemoteControlDeviceGUI *gui, QBoxLayout *v
                 connect(button, &QToolButton::clicked,
                     [=] (bool checked)
                     {
+                        (void) checked;
                         RemoteControl::MsgDeviceSetState *message = RemoteControl::MsgDeviceSetState::create(gui->m_rcDevice->m_protocol,
                                                                                                  gui->m_rcDevice->m_info.m_id,
                                                                                                  control.m_id,
@@ -483,6 +484,9 @@ void RemoteControlGUI::createControls(RemoteControlDeviceGUI *gui, QBoxLayout *v
             }
             break;
 
+        default:
+            qDebug() << "RemoteControlGUI::createControls: Unexpected type for control.";
+            break;
 
         }
         gui->m_controls.insert(control.m_id, widgets);
@@ -824,7 +828,7 @@ void RemoteControlGUI::updateControl(QWidget *widget, const DeviceDiscoverer::Co
 {
     if (ButtonSwitch *button = qobject_cast<ButtonSwitch *>(widget))
     {
-        if (value.type() == QMetaType::QString)
+        if ((QMetaType::Type)value.type() == QMetaType::QString)
         {
             if (value.toString() == "unavailable")
             {
@@ -1007,7 +1011,7 @@ void RemoteControlGUI::updateChart(RemoteControlDeviceGUI *deviceGUI, const QStr
     {
         formattedValue = QString::asprintf(format.toUtf8(), value.toInt());
     }
-    else if ((value.type() == QMetaType::Double) || (value.type() == QMetaType::Float))
+    else if (((QMetaType::Type)value.type() == QMetaType::Double) || ((QMetaType::Type)value.type() == QMetaType::Float))
     {
         if (format.isEmpty()) {
             format = "%.1f";
diff --git a/plugins/feature/remotecontrol/remotecontrolsettingsdialog.cpp b/plugins/feature/remotecontrol/remotecontrolsettingsdialog.cpp
index 68040e6f4..5d19b6b61 100644
--- a/plugins/feature/remotecontrol/remotecontrolsettingsdialog.cpp
+++ b/plugins/feature/remotecontrol/remotecontrolsettingsdialog.cpp
@@ -23,8 +23,8 @@
 
 RemoteControlSettingsDialog::RemoteControlSettingsDialog(RemoteControlSettings *settings, QWidget* parent) :
     QDialog(parent),
-    m_settings(settings),
-    ui(new Ui::RemoteControlSettingsDialog)
+    ui(new Ui::RemoteControlSettingsDialog),
+    m_settings(settings)
 {
     ui->setupUi(this);
     resizeTable();
@@ -121,11 +121,14 @@ void RemoteControlSettingsDialog::accept()
 
 void RemoteControlSettingsDialog::on_devices_cellDoubleClicked(int row, int column)
 {
+    (void)row;
+    (void)column;
     on_edit_clicked();
 }
 
 void RemoteControlSettingsDialog::devicesSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
 {
+    (void)deselected;
     bool enabled = selected.indexes().size() > 0;
     ui->remove->setEnabled(enabled);
     ui->edit->setEnabled(enabled);
diff --git a/plugins/feature/remotecontrol/remotecontrolvisacontroldialog.cpp b/plugins/feature/remotecontrol/remotecontrolvisacontroldialog.cpp
index 289a7b511..4bf8a2d7b 100644
--- a/plugins/feature/remotecontrol/remotecontrolvisacontroldialog.cpp
+++ b/plugins/feature/remotecontrol/remotecontrolvisacontroldialog.cpp
@@ -155,11 +155,13 @@ void RemoteControlVISAControlDialog::on_name_textChanged(const QString &text)
 
 void RemoteControlVISAControlDialog::on_id_textChanged(const QString &text)
 {
+    (void)text;
     validate();
 }
 
 void RemoteControlVISAControlDialog::on_id_textEdited(const QString &text)
 {
+    (void)text;
     m_userHasEditedId = true;
 }
 
diff --git a/plugins/feature/remotecontrol/remotecontrolvisasensordialog.cpp b/plugins/feature/remotecontrol/remotecontrolvisasensordialog.cpp
index 38792db11..d701521b5 100644
--- a/plugins/feature/remotecontrol/remotecontrolvisasensordialog.cpp
+++ b/plugins/feature/remotecontrol/remotecontrolvisasensordialog.cpp
@@ -65,11 +65,13 @@ void RemoteControlVISASensorDialog::on_name_textChanged(const QString &text)
 
 void RemoteControlVISASensorDialog::on_id_textChanged(const QString &text)
 {
+    (void)text;
     validate();
 }
 
 void RemoteControlVISASensorDialog::on_id_textEdited(const QString &text)
 {
+    (void)text;
     m_userHasEditedId = true;
 }
 
diff --git a/plugins/feature/remotecontrol/remotecontrolworker.cpp b/plugins/feature/remotecontrol/remotecontrolworker.cpp
index 405f85bb9..981d94084 100644
--- a/plugins/feature/remotecontrol/remotecontrolworker.cpp
+++ b/plugins/feature/remotecontrol/remotecontrolworker.cpp
@@ -102,22 +102,22 @@ bool RemoteControlWorker::handleMessage(const Message& cmd)
             QString id = msg.getId();
             QVariant variant = msg.getValue();
 
-            if (variant.type() == QMetaType::Bool)
+            if ((QMetaType::Type)variant.type() == QMetaType::Bool)
             {
                 bool b = variant.toBool();
                 device->setState(id, b);
             }
-            else if (variant.type() == QMetaType::Int)
+            else if ((QMetaType::Type)variant.type() == QMetaType::Int)
             {
                 int i = variant.toInt();
                 device->setState(id, i);
             }
-            else if (variant.type() == QMetaType::Float)
+            else if ((QMetaType::Type)variant.type() == QMetaType::Float)
             {
                 float f = variant.toFloat();
                 device->setState(id, f);
             }
-            else if (variant.type() == QMetaType::QString)
+            else if ((QMetaType::Type)variant.type() == QMetaType::QString)
             {
                 QString s = variant.toString();
                 device->setState(id, s);
diff --git a/sdrbase/util/iot/device.cpp b/sdrbase/util/iot/device.cpp
index bca6ed126..d34c8f868 100644
--- a/sdrbase/util/iot/device.cpp
+++ b/sdrbase/util/iot/device.cpp
@@ -52,42 +52,41 @@ Device* Device::create(const QHash<QString, QVariant>& settings, const QString&
             else
             {
                 qDebug() << "Device::create: A deviceId is required for: " << protocol;
-                return nullptr;
             }
         }
         else if (protocol == "HomeAssistant")
         {
-            if (checkSettings(settings, protocol))
+            if (settings.contains("deviceId"))
             {
-                if (settings.contains("deviceId"))
-                {
-                    return new HomeAssistantDevice(settings.value("apiKey").toString(),
-                                                   settings.value("url").toString(),
-                                                   settings.value("deviceId").toString(),
-                                                   settings.value("controlIds").toStringList(),
-                                                   settings.value("sensorIds").toStringList(),
-                                                   info);
-                }
-                else
-                {
-                    qDebug() << "Device::create: A deviceId is required for: " << protocol;
-                    return nullptr;
-                }
+                return new HomeAssistantDevice(settings.value("apiKey").toString(),
+                                               settings.value("url").toString(),
+                                               settings.value("deviceId").toString(),
+                                               settings.value("controlIds").toStringList(),
+                                               settings.value("sensorIds").toStringList(),
+                                               info);
+            }
+            else
+            {
+                qDebug() << "Device::create: A deviceId is required for: " << protocol;
             }
         }
         else if (protocol == "VISA")
         {
-            return new VISADevice(settings,
-                                  settings.value("deviceId").toString(),
-                                  settings.value("controlIds").toStringList(),
-                                  settings.value("sensorIds").toStringList(),
-                                  info);
+            if (settings.contains("deviceId"))
+            {
+                return new VISADevice(settings,
+                                      settings.value("deviceId").toString(),
+                                      settings.value("controlIds").toStringList(),
+                                      settings.value("sensorIds").toStringList(),
+                                      info);
+            }
+            else
+            {
+                qDebug() << "Device::create: A deviceId is required for: " << protocol;
+            }
         }
     }
-    else
-    {
-        return nullptr;
-    }
+    return nullptr;
 }
 
 bool Device::checkSettings(const QHash<QString, QVariant>& settings, const QString& protocol)
@@ -135,6 +134,26 @@ bool Device::checkSettings(const QHash<QString, QVariant>& settings, const QStri
     }
 }
 
+void Device::setState(const QString &controlId, bool state)
+{
+    qDebug() << "Device::setState: " << getProtocol() << " doesn't support bool. Can't set " << controlId << " to " << state;
+}
+
+void Device::setState(const QString &controlId, int state)
+{
+    qDebug() << "Device::setState: " << getProtocol() << " doesn't support int. Can't set " << controlId << " to " << state;
+}
+
+void Device::setState(const QString &controlId, float state)
+{
+    qDebug() << "Device::setState: " << getProtocol() << " doesn't support float. Can't set " << controlId << " to " << state;
+}
+
+void Device::setState(const QString &controlId, const QString &state)
+{
+    qDebug() << "Device::setState: " << getProtocol() << " doesn't support QString. Can't set " << controlId << " to " << state;
+}
+
 const QStringList DeviceDiscoverer::m_typeStrings = {
     "Auto",
     "Boolean",
@@ -446,7 +465,7 @@ void DeviceDiscoverer::DeviceInfo::deleteSensor(const QString &id)
 QDataStream& operator<<(QDataStream& out, const DeviceDiscoverer::ControlInfo* control)
 {
     int typeId;
-    if (const VISADevice::VISAControl* c = dynamic_cast<const VISADevice::VISAControl *>(control)) {
+    if (dynamic_cast<const VISADevice::VISAControl *>(control)) {
         typeId = 1;
     } else {
         typeId = 0;
@@ -474,7 +493,7 @@ QDataStream& operator>>(QDataStream& in, DeviceDiscoverer::ControlInfo*& control
 QDataStream& operator<<(QDataStream& out, const DeviceDiscoverer::SensorInfo* sensor)
 {
     int typeId;
-    if (const VISADevice::VISASensor* s = dynamic_cast<const VISADevice::VISASensor *>(sensor)) {
+    if (dynamic_cast<const VISADevice::VISASensor *>(sensor)) {
         typeId = 1;
     } else {
         typeId = 0;
diff --git a/sdrbase/util/iot/device.h b/sdrbase/util/iot/device.h
index 802e4687e..11d8bdb39 100644
--- a/sdrbase/util/iot/device.h
+++ b/sdrbase/util/iot/device.h
@@ -57,6 +57,7 @@ public:
         QString m_units;
 
         ControlInfo();
+        virtual ~ControlInfo() {}
         operator QString() const;
         virtual ControlInfo *clone() const;
         virtual QByteArray serialize() const;
@@ -69,6 +70,7 @@ public:
         Type m_type;
         QString m_units;        // W/Watts etc
 
+	virtual ~SensorInfo() {}
         operator QString() const;
         virtual SensorInfo *clone() const;
         virtual QByteArray serialize() const;
@@ -122,10 +124,10 @@ public:
     static bool checkSettings(const QHash<QString, QVariant>& settings, const QString& protocol);
 
     virtual void getState() = 0;
-    virtual void setState(const QString &controlId, bool state) {}
-    virtual void setState(const QString &controlId, int state) {}
-    virtual void setState(const QString &controlId, float state) {}
-    virtual void setState(const QString &controlId, const QString &state) {}
+    virtual void setState(const QString &controlId, bool state);
+    virtual void setState(const QString &controlId, int state);
+    virtual void setState(const QString &controlId, float state);
+    virtual void setState(const QString &controlId, const QString &state);
     virtual QString getProtocol() const = 0;
     virtual QString getDeviceId() const = 0;
 
diff --git a/sdrbase/util/iot/homeassistant.cpp b/sdrbase/util/iot/homeassistant.cpp
index df07ed4f5..b53c7df71 100644
--- a/sdrbase/util/iot/homeassistant.cpp
+++ b/sdrbase/util/iot/homeassistant.cpp
@@ -30,9 +30,9 @@ HomeAssistantDevice::HomeAssistantDevice(const QString& apiKey, const QString& u
                                         const QStringList &controls, const QStringList &sensors,
                                         DeviceDiscoverer::DeviceInfo *info) :
     Device(info),
+    m_deviceId(deviceId),
     m_apiKey(apiKey),
-    m_url(url),
-    m_deviceId(deviceId)
+    m_url(url)
 {
     m_entities = controls;
     m_entities.append(sensors);
diff --git a/sdrbase/util/iot/homeassistant.h b/sdrbase/util/iot/homeassistant.h
index 7fc8ea54a..1380229a5 100644
--- a/sdrbase/util/iot/homeassistant.h
+++ b/sdrbase/util/iot/homeassistant.h
@@ -30,6 +30,7 @@ public:
                         DeviceDiscoverer::DeviceInfo *info=nullptr);
     ~HomeAssistantDevice();
     virtual void getState() override;
+    using Device::setState;
     virtual void setState(const QString &controlId, bool state) override;
     virtual QString getProtocol() const override { return "HomeAssistant"; }
     virtual QString getDeviceId() const override { return m_deviceId; }
diff --git a/sdrbase/util/iot/tplink.cpp b/sdrbase/util/iot/tplink.cpp
index 119becfda..6caf9bdda 100644
--- a/sdrbase/util/iot/tplink.cpp
+++ b/sdrbase/util/iot/tplink.cpp
@@ -285,7 +285,6 @@ void TPLinkDevice::handleReply(QNetworkReply* reply)
                                 QJsonObject sysInfoObj = systemObj.value(QStringLiteral("get_sysinfo")).toObject();
                                 if (sysInfoObj.contains(QStringLiteral("child_num")))
                                 {
-                                    int childNum = sysInfoObj.value(QStringLiteral("child_num")).toInt();
                                     QJsonArray children = sysInfoObj.value(QStringLiteral("children")).toArray();
                                     for (auto childRef : children)
                                     {
@@ -495,7 +494,6 @@ void TPLinkDeviceDiscoverer::handleReply(QNetworkReply* reply)
                                 }
                                 if (sysInfoObj.contains(QStringLiteral("child_num")))
                                 {
-                                    int childNum = sysInfoObj.value(QStringLiteral("child_num")).toInt();
                                     QJsonArray children = sysInfoObj.value(QStringLiteral("children")).toArray();
                                     int child = 1;
                                     for (auto childRef : children)
diff --git a/sdrbase/util/iot/tplink.h b/sdrbase/util/iot/tplink.h
index 3ffd4a37d..ebea2bd39 100644
--- a/sdrbase/util/iot/tplink.h
+++ b/sdrbase/util/iot/tplink.h
@@ -44,6 +44,7 @@ public:
     TPLinkDevice(const QString& username, const QString &password, const QString &deviceId, DeviceDiscoverer::DeviceInfo *info=nullptr);
     ~TPLinkDevice();
     virtual void getState() override;
+    using Device::setState;
     virtual void setState(const QString &controlId, bool state) override;
     virtual QString getProtocol() const override { return "TPLink"; }
     virtual QString getDeviceId() const override { return m_deviceId; }
diff --git a/sdrbase/util/iot/visa.h b/sdrbase/util/iot/visa.h
index e147c1f07..f8dabe00d 100644
--- a/sdrbase/util/iot/visa.h
+++ b/sdrbase/util/iot/visa.h
@@ -47,6 +47,7 @@ public:
                DeviceDiscoverer::DeviceInfo *info=nullptr);
     ~VISADevice();
     virtual void getState() override;
+    using Device::setState;
     virtual void setState(const QString &controlId, bool state) override;
     virtual void setState(const QString &controlId, int state) override;
     virtual void setState(const QString &controlId, float state) override;
diff --git a/sdrbase/util/simpleserializer.h b/sdrbase/util/simpleserializer.h
index 2920cf4e7..fc63d9907 100644
--- a/sdrbase/util/simpleserializer.h
+++ b/sdrbase/util/simpleserializer.h
@@ -3,6 +3,7 @@
 
 #include <QString>
 #include <QMap>
+#include <QDataStream>
 #include "dsp/dsptypes.h"
 #include "export.h"