diff --git a/libguh/devicemanager.cpp b/libguh/devicemanager.cpp
index dfe24574..829c702e 100644
--- a/libguh/devicemanager.cpp
+++ b/libguh/devicemanager.cpp
@@ -167,7 +167,7 @@ DeviceManager::DeviceError DeviceManager::discoverDevices(const DeviceClassId &d
     Optionally you can supply an id yourself if you must keep track of the added device. If you don't supply it, a new one will
     be generated.
 */
-DeviceManager::DeviceError DeviceManager::addConfiguredDevice(const DeviceClassId &deviceClassId, const QVariantMap &params, const DeviceId id)
+DeviceManager::DeviceError DeviceManager::addConfiguredDevice(const DeviceClassId &deviceClassId, const QList<Param> &params, const DeviceId id)
 {
     DeviceClass deviceClass = findDeviceClass(deviceClassId);
     if (!deviceClass.isValid()) {
@@ -198,7 +198,7 @@ DeviceManager::DeviceError DeviceManager::addConfiguredDevice(const DeviceClassI
     return addConfiguredDeviceInternal(deviceClassId, descriptor.params(), deviceId);
 }
 
-DeviceManager::DeviceError DeviceManager::addConfiguredDeviceInternal(const DeviceClassId &deviceClassId, const QVariantMap &params, const DeviceId id)
+DeviceManager::DeviceError DeviceManager::addConfiguredDeviceInternal(const DeviceClassId &deviceClassId, const QList<Param> &params, const DeviceId id)
 {
     DeviceClass deviceClass = findDeviceClass(deviceClassId);
     if (deviceClass.id().isNull()) {
@@ -207,18 +207,24 @@ DeviceManager::DeviceError DeviceManager::addConfiguredDeviceInternal(const Devi
     }
 
     // Make sure we have all required params
-    foreach (const QVariant &param, deviceClass.params()) {
-        if (!params.contains(param.toMap().value("name").toString())) {
-            qWarning() << "Missing parameter when creating device:" << param.toMap().value("name").toString();
+    foreach (const ParamType &paramType, deviceClass.params()) {
+        bool found = false;
+        foreach (const Param &param, params) {
+            if (param.name() == paramType.name()) {
+                found = true;
+            }
+        }
+
+        if (!found) {
+            qWarning() << "Missing parameter when creating device:" << paramType.name();
             return DeviceErrorMissingParameter;
         }
     }
     // Make sure we don't have unused params
-    foreach (const QString &paramId, params.keys()) {
-        qDebug() << "searching" << paramId << "in" << deviceClass.params();
+    foreach (const Param &param, params) {
         bool found = false;
-        foreach (const QVariant &param, deviceClass.params()) {
-            if (param.toMap().value("name").toString() == paramId) {
+        foreach (const ParamType &paramType, deviceClass.params()) {
+            if (paramType.name() == param.name()) {
                 found = true;
                 continue;
             }
@@ -399,7 +405,17 @@ void DeviceManager::loadConfiguredDevices()
         settings.beginGroup(idString);
         Device *device = new Device(PluginId(settings.value("pluginid").toString()), DeviceId(idString), DeviceClassId(settings.value("deviceClassId").toString()), this);
         device->setName(settings.value("devicename").toString());
-        device->setParams(settings.value("params").toMap());
+
+        QList<Param> params;
+        foreach (QString paramNameString, settings.childGroups()) {
+            settings.beginGroup(paramNameString);
+            Param param(paramNameString.remove(QRegExp("^Param-")));
+            param.setValue(settings.value("value"));
+            param.setOperand((Param::OperandType)settings.value("operand").toInt());
+            settings.endGroup();
+        }
+        device->setParams(params);
+
         settings.endGroup();
 
         setupDevice(device);
@@ -417,7 +433,12 @@ void DeviceManager::storeConfiguredDevices()
         settings.setValue("devicename", device->name());
         settings.setValue("deviceClassId", device->deviceClassId().toString());
         settings.setValue("pluginid", device->pluginId());
-        settings.setValue("params", device->params());
+        foreach (const Param &param, device->params()) {
+            settings.beginGroup("Param-" + param.name());
+            settings.setValue("value", param.value());
+            settings.setValue("operand", param.operand());
+            settings.endGroup();
+        }
         settings.endGroup();
     }
 }
diff --git a/libguh/devicemanager.h b/libguh/devicemanager.h
index f0aea7f4..68cfd97e 100644
--- a/libguh/devicemanager.h
+++ b/libguh/devicemanager.h
@@ -72,7 +72,7 @@ public:
     DeviceError discoverDevices(const DeviceClassId &deviceClassId, const QVariantMap &params) const;
 
     QList<Device*> configuredDevices() const;
-    DeviceError addConfiguredDevice(const DeviceClassId &deviceClassId, const QVariantMap &params, const DeviceId id = DeviceId::createDeviceId());
+    DeviceError addConfiguredDevice(const DeviceClassId &deviceClassId, const QList<Param> &params, const DeviceId id = DeviceId::createDeviceId());
     DeviceError addConfiguredDevice(const DeviceClassId &deviceClassId, const DeviceDescriptorId &deviceDescriptorId, const DeviceId &id = DeviceId::createDeviceId());
     DeviceError removeConfiguredDevice(const DeviceId &deviceId);
 
@@ -103,7 +103,7 @@ private slots:
     void timerEvent();
 
 private:
-    DeviceError addConfiguredDeviceInternal(const DeviceClassId &deviceClassId, const QVariantMap &params, const DeviceId id = DeviceId::createDeviceId());
+    DeviceError addConfiguredDeviceInternal(const DeviceClassId &deviceClassId, const QList<Param> &params, const DeviceId id = DeviceId::createDeviceId());
     bool setupDevice(Device *device);
 
     QHash<VendorId, Vendor> m_supportedVendors;
diff --git a/libguh/libguh.pro b/libguh/libguh.pro
index 241fb8ab..bd873d29 100644
--- a/libguh/libguh.pro
+++ b/libguh/libguh.pro
@@ -20,6 +20,8 @@ SOURCES += plugin/device.cpp \
            types/eventtype.cpp \
            types/event.cpp \
            types/vendor.cpp \
+           types/paramtype.cpp \
+    types/param.cpp
 
 HEADERS += plugin/device.h \
            plugin/deviceclass.h \
@@ -36,4 +38,6 @@ HEADERS += plugin/device.h \
            types/event.h \
            types/vendor.h \
            types/typeutils.h \
+           types/paramtype.h \
+    types/param.h
 
diff --git a/libguh/plugin/device.cpp b/libguh/plugin/device.cpp
index 03695ce2..6b9d7319 100644
--- a/libguh/plugin/device.cpp
+++ b/libguh/plugin/device.cpp
@@ -82,23 +82,43 @@ void Device::setName(const QString &name)
 }
 
 /*! Returns the parameter of this Device. It must match the parameter description in the associated \l{DeviceClass}. */
-QVariantMap Device::params() const
+QList<Param> Device::params() const
 {
     return m_params;
 }
 
 /*! Sets the \a params of this Device. It must match the parameter description in the associated \l{DeviceClass}. */
-void Device::setParams(const QVariantMap &params)
+void Device::setParams(const QList<Param> &params)
 {
     m_params = params;
 }
 
+QVariant Device::paramValue(const QString &paramName) const
+{
+    foreach (const Param &param, m_params) {
+        if (param.name() == paramName) {
+            return param.value();
+        }
+    }
+    return QVariant();
+}
+
 /*! Returns the states of this Device. It must match the \l{StateType} description in the associated \l{DeviceClass}. */
 QList<State> Device::states() const
 {
     return m_states;
 }
 
+bool Device::hasParam(const QString &paramName) const
+{
+    foreach (const Param &param, m_params) {
+        if (param.name() == paramName) {
+            return true;
+        }
+    }
+    return false;
+}
+
 /*! Sets the \a states of this Device. It must match the \l{StateType} description in the associated \l{DeviceClass}. */
 void Device::setStates(const QList<State> &states)
 {
diff --git a/libguh/plugin/device.h b/libguh/plugin/device.h
index 68779fa6..02aa6d29 100644
--- a/libguh/plugin/device.h
+++ b/libguh/plugin/device.h
@@ -23,6 +23,7 @@
 
 #include "plugin/deviceclass.h"
 #include "types/state.h"
+#include "types/param.h"
 
 #include <QObject>
 #include <QUuid>
@@ -43,10 +44,13 @@ public:
     QString name() const;
     void setName(const QString &name);
 
-    QVariantMap params() const;
-    void setParams(const QVariantMap &params);
+    QList<Param> params() const;
+    void setParams(const QList<Param> &params);
+
+    QVariant paramValue(const QString &paramName) const;
 
     QList<State> states() const;
+    bool hasParam(const QString &paramName) const;
     void setStates(const QList<State> &states);
 
     bool hasState(const StateTypeId &stateTypeId) const;
@@ -65,7 +69,7 @@ private:
     DeviceClassId m_deviceClassId;
     PluginId m_pluginId;
     QString m_name;
-    QVariantMap m_params;
+    QList<Param> m_params;
     QList<State> m_states;
 };
 
diff --git a/libguh/plugin/deviceclass.cpp b/libguh/plugin/deviceclass.cpp
index 0f591d04..a558cf4a 100644
--- a/libguh/plugin/deviceclass.cpp
+++ b/libguh/plugin/deviceclass.cpp
@@ -129,14 +129,14 @@ void DeviceClass::setActions(const QList<ActionType> &actionTypes)
 
 /*! Returns the params description of this DeviceClass. \{Device}{Devices} created
     from this DeviceClass must have their params matching to this template. */
-QVariantList DeviceClass::params() const
+QList<ParamType> DeviceClass::params() const
 {
     return m_params;
 }
 
 /*! Set the \a params of this DeviceClass. \{Device}{Devices} created
     from this DeviceClass must have their actions matching to this template. */
-void DeviceClass::setParams(const QVariantList &params)
+void DeviceClass::setParams(const QList<ParamType> &params)
 {
     m_params = params;
 }
diff --git a/libguh/plugin/deviceclass.h b/libguh/plugin/deviceclass.h
index 11fccfc5..b74b81c1 100644
--- a/libguh/plugin/deviceclass.h
+++ b/libguh/plugin/deviceclass.h
@@ -24,6 +24,7 @@
 #include "types/eventtype.h"
 #include "types/actiontype.h"
 #include "types/statetype.h"
+#include "types/paramtype.h"
 
 #include <QList>
 #include <QUuid>
@@ -62,8 +63,8 @@ public:
     QList<ActionType> actions() const;
     void setActions(const QList<ActionType> &actionTypes);
 
-    QVariantList params() const;
-    void setParams(const QVariantList &params);
+    QList<ParamType> params() const;
+    void setParams(const QList<ParamType> &params);
 
     CreateMethod createMethod() const;
     void setCreateMethod(CreateMethod createMethod);
@@ -80,7 +81,7 @@ private:
     QList<StateType> m_states;
     QList<EventType> m_events;
     QList<ActionType> m_actions;
-    QVariantList m_params;
+    QList<ParamType> m_params;
     CreateMethod m_createMethod;
     SetupMethod m_setupMethod;
 };
diff --git a/libguh/plugin/devicedescriptor.cpp b/libguh/plugin/devicedescriptor.cpp
index 34bd3a86..b65de7a0 100644
--- a/libguh/plugin/devicedescriptor.cpp
+++ b/libguh/plugin/devicedescriptor.cpp
@@ -58,12 +58,12 @@ void DeviceDescriptor::setDescription(const QString &description)
     m_description = description;
 }
 
-QVariantMap DeviceDescriptor::params() const
+QList<Param> DeviceDescriptor::params() const
 {
     return m_params;
 }
 
-void DeviceDescriptor::setParams(const QVariantMap &params)
+void DeviceDescriptor::setParams(const QList<Param> &params)
 {
     m_params = params;
 }
diff --git a/libguh/plugin/devicedescriptor.h b/libguh/plugin/devicedescriptor.h
index ab239d7b..3aa8ef7b 100644
--- a/libguh/plugin/devicedescriptor.h
+++ b/libguh/plugin/devicedescriptor.h
@@ -2,6 +2,7 @@
 #define DEVICEDESCRIPTION_H
 
 #include <typeutils.h>
+#include <types/param.h>
 
 #include <QVariantMap>
 
@@ -23,15 +24,15 @@ public:
     QString description() const;
     void setDescription(const QString &description);
 
-    QVariantMap params() const;
-    void setParams(const QVariantMap &params);
+    QList<Param> params() const;
+    void setParams(const QList<Param> &params);
 
 private:
     DeviceDescriptorId m_id;
     DeviceClassId m_deviceClassId;
     QString m_title;
     QString m_description;
-    QVariantMap m_params;
+    QList<Param> m_params;
 };
 
 #endif // DEVICEDESCRIPTION_H
diff --git a/libguh/plugin/deviceplugin.cpp b/libguh/plugin/deviceplugin.cpp
index 92fea89f..4c4829f1 100644
--- a/libguh/plugin/deviceplugin.cpp
+++ b/libguh/plugin/deviceplugin.cpp
@@ -216,12 +216,12 @@ QList<Device *> DevicePlugin::myDevices() const
  Find a certain device from myDevices() by its params. All parameters must
  match or the device will not be found. Be prepared for nullptrs.
  */
-Device *DevicePlugin::findDeviceByParams(const QVariantMap &params) const
+Device *DevicePlugin::findDeviceByParams(const QList<Param> &params) const
 {
     foreach (Device *device, myDevices()) {
         bool matching = true;
-        foreach (const QString &paramName, device->params().keys()) {
-            if (device->params().value(paramName) == params.value(paramName)) {
+        foreach (const Param &param, params) {
+            if (device->paramValue(param.name()) == param.value()) {
                 return device;
             }
         }
diff --git a/libguh/plugin/deviceplugin.h b/libguh/plugin/deviceplugin.h
index 1890e125..a001aaba 100644
--- a/libguh/plugin/deviceplugin.h
+++ b/libguh/plugin/deviceplugin.h
@@ -74,7 +74,7 @@ signals:
 protected:
     DeviceManager *deviceManager() const;
     QList<Device*> myDevices() const;
-    Device* findDeviceByParams(const QVariantMap &params) const;
+    Device* findDeviceByParams(const QList<Param> &params) const;
 
     void transmitData(QList<int> rawData);
 
diff --git a/libguh/types/action.cpp b/libguh/types/action.cpp
index 89816918..68744958 100644
--- a/libguh/types/action.cpp
+++ b/libguh/types/action.cpp
@@ -58,13 +58,23 @@ DeviceId Action::deviceId() const
 }
 
 /*! Returns the parameters for this Action.*/
-QVariantMap Action::params() const
+QList<Param> Action::params() const
 {
     return m_params;
 }
 
 /*! Set the the parameters for this Action. \a params must match the template in the \l{ActionType} referred by \l{Action::actionTypeId()}*/
-void Action::setParams(const QVariantMap &params)
+void Action::setParams(const QList<Param> &params)
 {
     m_params = params;
 }
+
+Param Action::param(const QString &paramName) const
+{
+    foreach (const Param &param, m_params) {
+        if (param.name() == paramName) {
+            return param;
+        }
+    }
+    return Param(QString());
+}
diff --git a/libguh/types/action.h b/libguh/types/action.h
index 28a0cd4c..cfed1194 100644
--- a/libguh/types/action.h
+++ b/libguh/types/action.h
@@ -20,6 +20,7 @@
 #define ACTION_H
 
 #include "typeutils.h"
+#include "param.h"
 
 #include <QVariantList>
 
@@ -33,13 +34,14 @@ public:
     ActionTypeId actionTypeId() const;
     DeviceId deviceId() const;
 
-    QVariantMap params() const;
-    void setParams(const QVariantMap &params);
+    QList<Param> params() const;
+    void setParams(const QList<Param> &params);
+    Param param(const QString &paramName) const;
 
 private:
     ActionTypeId m_actionTypeId;
     DeviceId m_deviceId;
-    QVariantMap m_params;
+    QList<Param> m_params;
 };
 
 #endif // ACTION_H
diff --git a/libguh/types/event.cpp b/libguh/types/event.cpp
index 76a68914..f7031bb0 100644
--- a/libguh/types/event.cpp
+++ b/libguh/types/event.cpp
@@ -36,7 +36,7 @@
 /*! Constructs a Event reflecting the \l{Event} given by \a EventTypeId, associated with
     the \l{Device} given by \a deviceId and the parameters given by \a params. The parameters must
     match the description in the reflecting \l{Event}.*/
-Event::Event(const EventTypeId &eventTypeId, const DeviceId &deviceId, const QVariantMap &params):
+Event::Event(const EventTypeId &eventTypeId, const DeviceId &deviceId, const QList<Param> &params):
     m_eventTypeId(eventTypeId),
     m_deviceId(deviceId),
     m_params(params)
@@ -56,31 +56,43 @@ DeviceId Event::deviceId() const
 }
 
 /*! Returns the parameters of this Event.*/
-QVariantMap Event::params() const
+QList<Param> Event::params() const
 {
     return m_params;
 }
 
 /*! Set the parameters of this Event to \a params.*/
-void Event::setParams(const QVariantMap &params)
+void Event::setParams(const QList<Param> &params)
 {
     m_params = params;
 }
 
+Param Event::param(const QString &paramName) const
+{
+    foreach (const Param &param, m_params) {
+        if (param.name() == paramName) {
+            return param;
+        }
+    }
+    return Param(QString());
+}
+
 /*! Compare this Event to the Event given by \a other.
     Events are equal (returns true) if eventTypeId, deviceId and params match. */
 bool Event::operator ==(const Event &other) const
 {
-
-    bool result =m_eventTypeId == other.eventTypeId()
-            && m_deviceId == other.deviceId()
-            && m_params == other.params();
-
-    qDebug() << "comparing event" << *this << "with" << other << "result is" << result << "params" << m_params << "other" << other.params();
+    bool paramsMatch = true;
+    foreach (const Param &otherParam, other.params()) {
+        Param param = this->param(otherParam.name());
+        if (!param.isValid() || param.value() != otherParam.value()) {
+            paramsMatch = false;
+            break;
+        }
+    }
 
     return m_eventTypeId == other.eventTypeId()
             && m_deviceId == other.deviceId()
-            && m_params == other.params();
+            && paramsMatch;
 }
 
 QDebug operator<<(QDebug dbg, const Event &event)
diff --git a/libguh/types/event.h b/libguh/types/event.h
index ac79a953..c85fc775 100644
--- a/libguh/types/event.h
+++ b/libguh/types/event.h
@@ -20,6 +20,7 @@
 #define EVENT_H
 
 #include "typeutils.h"
+#include "types/param.h"
 
 #include <QString>
 #include <QVariantList>
@@ -28,20 +29,21 @@
 class Event
 {
 public:
-    Event(const EventTypeId &eventTypeId, const DeviceId &deviceId, const QVariantMap &params);
+    Event(const EventTypeId &eventTypeId, const DeviceId &deviceId, const QList<Param> &params = QList<Param>());
 
     EventTypeId eventTypeId() const;
     DeviceId deviceId() const;
 
-    QVariantMap params() const;
-    void setParams(const QVariantMap &params);
+    QList<Param> params() const;
+    void setParams(const QList<Param> &params);
+    Param param(const QString &paramName) const;
 
     bool operator ==(const Event &other) const;
 
 private:
     EventTypeId m_eventTypeId;
     DeviceId m_deviceId;
-    QVariantMap m_params;
+    QList<Param> m_params;
 };
 QDebug operator<<(QDebug dbg, const Event &event);
 QDebug operator<<(QDebug dbg, const QList<Event> &events);
diff --git a/libguh/types/param.cpp b/libguh/types/param.cpp
new file mode 100644
index 00000000..41318cde
--- /dev/null
+++ b/libguh/types/param.cpp
@@ -0,0 +1,62 @@
+#include "param.h"
+
+#include <QDebug>
+
+Param::Param(const QString &name, const QVariant &value):
+    m_name (name),
+    m_value(value),
+    m_operand(OperandTypeEquals)
+{
+}
+
+QString Param::name() const
+{
+    return m_name;
+}
+
+void Param::setName(const QString &name)
+{
+    m_name = name;
+}
+
+QVariant Param::value() const
+{
+    return m_value;
+}
+
+void Param::setValue(const QVariant &value)
+{
+    m_value = value;
+}
+
+Param::OperandType Param::operand() const
+{
+    return m_operand;
+}
+
+void Param::setOperand(Param::OperandType operand)
+{
+    m_operand = operand;
+}
+
+bool Param::isValid() const
+{
+    return !m_name.isEmpty() && m_value.isValid();
+}
+
+QDebug operator<<(QDebug dbg, const Param &param)
+{
+    dbg.nospace() << "Param(Name: " << param.name() << ", Value:" << param.value() << ")";
+
+    return dbg.space();
+}
+
+QDebug operator<<(QDebug dbg, const QList<Param> &params)
+{
+    dbg.nospace() << "ParamList (count:" << params.count() << ")";
+    for (int i = 0; i < params.count(); i++ ) {
+        dbg.nospace() << "     " << i << ": " << params.at(i);
+    }
+
+    return dbg.space();
+}
diff --git a/libguh/types/param.h b/libguh/types/param.h
new file mode 100644
index 00000000..743c7a20
--- /dev/null
+++ b/libguh/types/param.h
@@ -0,0 +1,41 @@
+#ifndef PARAM_H
+#define PARAM_H
+
+#include <QString>
+#include <QVariant>
+
+class Param
+{
+public:
+    enum OperandType {
+        OperandTypeEquals,
+        OperandTypeNotEquals,
+        OperandTypeLess,
+        OperandTypeGreater,
+        OperandTypeLessThan,
+        OperandTypeGreaterThan
+    };
+
+    Param(const QString &name, const QVariant &value = QVariant());
+
+    QString name() const;
+    void setName(const QString &name);
+
+    QVariant value() const;
+    void setValue(const QVariant &value);
+
+    OperandType operand() const;
+    void setOperand(OperandType operand);
+
+    bool isValid() const;
+
+private:
+    QString m_name;
+    QVariant m_value;
+    OperandType m_operand;
+};
+
+QDebug operator<<(QDebug dbg, const Param &param);
+QDebug operator<<(QDebug dbg, const QList<Param> &params);
+
+#endif // PARAM_H
diff --git a/libguh/types/paramtype.cpp b/libguh/types/paramtype.cpp
new file mode 100644
index 00000000..bee8493a
--- /dev/null
+++ b/libguh/types/paramtype.cpp
@@ -0,0 +1,58 @@
+#include "paramtype.h"
+
+ParamType::ParamType(const QString &name, const QVariant::Type type, const QVariant &defaultValue):
+    m_name(name),
+    m_type(type),
+    m_defaultValue(defaultValue)
+{
+}
+
+QString ParamType::name() const
+{
+    return m_name;
+}
+
+void ParamType::setName(const QString &name)
+{
+    m_name = name;
+}
+
+QVariant::Type ParamType::type() const
+{
+    return m_type;
+}
+
+void ParamType::setType(QVariant::Type type)
+{
+    m_type = type;
+}
+
+QVariant ParamType::defaultValue() const
+{
+    return m_defaultValue;
+}
+
+void ParamType::setDefaultValue(const QVariant &defaultValue)
+{
+    m_defaultValue = defaultValue;
+}
+
+QVariant ParamType::minValue() const
+{
+    return m_minValue;
+}
+
+void ParamType::setMinValue(const QVariant &minValue)
+{
+    m_minValue = minValue;
+}
+
+QVariant ParamType::maxValue() const
+{
+    return m_maxValue;
+}
+
+void ParamType::setMaxValue(const QVariant &maxValue)
+{
+    m_maxValue = maxValue;
+}
diff --git a/libguh/types/paramtype.h b/libguh/types/paramtype.h
new file mode 100644
index 00000000..a15b1482
--- /dev/null
+++ b/libguh/types/paramtype.h
@@ -0,0 +1,34 @@
+#ifndef PARAMTYPE_H
+#define PARAMTYPE_H
+
+#include <QVariant>
+
+class ParamType
+{
+public:
+    ParamType(const QString &name, const QVariant::Type type, const QVariant &defaultValue = QVariant());
+
+    QString name() const;
+    void setName(const QString &name);
+
+    QVariant::Type type() const;
+    void setType(QVariant::Type type);
+
+    QVariant defaultValue() const;
+    void setDefaultValue(const QVariant &defaultValue);
+
+    QVariant minValue() const;
+    void setMinValue(const QVariant &minValue);
+
+    QVariant maxValue() const;
+    void setMaxValue(const QVariant &maxValue);
+
+private:
+    QString m_name;
+    QVariant::Type m_type;
+    QVariant m_defaultValue;
+    QVariant m_minValue;
+    QVariant m_maxValue;
+};
+
+#endif // PARAMTYPE_H
diff --git a/libguh/typeutils.h b/libguh/typeutils.h
index fd24dace..1e559128 100644
--- a/libguh/typeutils.h
+++ b/libguh/typeutils.h
@@ -28,14 +28,4 @@ DECLARE_TYPE_ID(StateType)
 DECLARE_TYPE_ID(ActionType)
 DECLARE_TYPE_ID(Plugin)
 
-
-enum ParamOperand {
-    ParamOperandEquals,
-    ParamOperandNotEquals,
-    ParamOperandLess,
-    ParamOperandGreater,
-    ParamOperandLessThan,
-    ParamOperandGreaterThan
-};
-
 #endif // TYPEUTILS_H
diff --git a/plugins/deviceplugins/boblight/devicepluginboblight.cpp b/plugins/deviceplugins/boblight/devicepluginboblight.cpp
index 9a897918..efb38730 100644
--- a/plugins/deviceplugins/boblight/devicepluginboblight.cpp
+++ b/plugins/deviceplugins/boblight/devicepluginboblight.cpp
@@ -85,8 +85,10 @@ bool DevicePluginBoblight::configureAutoDevice(QList<Device *> loadedDevices, De
     if (loadedDevices.count() < m_bobClient->lightsCount()) {
         int index = loadedDevices.count();
         device->setName("Boblight Channel " + QString::number(index));
-        QVariantMap params;
-        params.insert("channel", index);
+        QList<Param> params;
+        Param param("channel");
+        param.setValue(index);
+        params.append(param);
         device->setParams(params);
         device->setStateValue(colorStateTypeId, m_bobClient->currentColor(index));
         return true;
@@ -120,12 +122,12 @@ DeviceManager::DeviceError DevicePluginBoblight::executeAction(Device *device, c
     if (!m_bobClient->connected()) {
         return DeviceManager::DeviceErrorSetupFailed;
     }
-    QColor newColor = action.params().first().value<QColor>();
+    QColor newColor = action.param("color").value().value<QColor>();
     if (!newColor.isValid()) {
         return DeviceManager::DeviceErrorActionParameterError;
     }
     qDebug() << "executing boblight action" << newColor;
-    m_bobClient->setColor(device->params().value("channel").toInt(), newColor);
+    m_bobClient->setColor(device->paramValue("channel").toInt(), newColor);
     m_bobClient->sync();
 
     device->setStateValue(colorStateTypeId, newColor);
diff --git a/plugins/deviceplugins/elro/devicepluginelro.cpp b/plugins/deviceplugins/elro/devicepluginelro.cpp
index 27af620d..eab97e14 100644
--- a/plugins/deviceplugins/elro/devicepluginelro.cpp
+++ b/plugins/deviceplugins/elro/devicepluginelro.cpp
@@ -91,22 +91,16 @@ QList<DeviceClass> DevicePluginElro::supportedDevices() const
     DeviceClass deviceClassElroRemote(pluginId(), elroVendorId, elroRemoteId);
     deviceClassElroRemote.setName("Elro Remote");
     
-    QVariantList deviceParamsRemote;
-    QVariantMap channelParam;
-    channelParam.insert("name", "channel1");
-    channelParam.insert("type", "bool");
+    QList<ParamType> deviceParamsRemote;
+    ParamType channelParam = ParamType("channel1", QVariant::Bool);
     deviceParamsRemote.append(channelParam);
-    channelParam.insert("name", "channel2");
-    channelParam.insert("type", "bool");
+    channelParam = ParamType("channel2", QVariant::Bool);
     deviceParamsRemote.append(channelParam);
-    channelParam.insert("name", "channel3");
-    channelParam.insert("type", "bool");
+    channelParam = ParamType("channel3", QVariant::Bool);
     deviceParamsRemote.append(channelParam);
-    channelParam.insert("name", "channel4");
-    channelParam.insert("type", "bool");
+    channelParam = ParamType("channel4", QVariant::Bool);
     deviceParamsRemote.append(channelParam);
-    channelParam.insert("name", "channel5");
-    channelParam.insert("type", "bool");
+    channelParam = ParamType("channel5", QVariant::Bool);
     deviceParamsRemote.append(channelParam);
     
     deviceClassElroRemote.setParams(deviceParamsRemote);
@@ -152,37 +146,26 @@ QList<DeviceClass> DevicePluginElro::supportedDevices() const
     DeviceClass deviceClassElroSwitch(pluginId(), elroVendorId, elroSwitchId);
     deviceClassElroSwitch.setName("Elro Power Switch");
     
-    QVariantList deviceParamsSwitch;
-    QVariantMap paramSwitch;
-    paramSwitch.insert("name", "channel1");
-    paramSwitch.insert("type", "bool");
+    QList<ParamType> deviceParamsSwitch;
+    ParamType paramSwitch = ParamType("channel1", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "channel2");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel2", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "channel3");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel3", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "channel4");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel4", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "channel5");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel5", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "A");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel6", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "B");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel7", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "C");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel8", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "D");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel9", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
-    paramSwitch.insert("name", "E");
-    paramSwitch.insert("type", "bool");
+    paramSwitch = ParamType("channel10", QVariant::Bool);
     deviceParamsSwitch.append(paramSwitch);
 
     deviceClassElroSwitch.setParams(deviceParamsSwitch);
@@ -230,27 +213,27 @@ DeviceManager::DeviceError DevicePluginElro::executeAction(Device *device, const
     // =======================================
     // create the bincode
     // channels
-    if(device->params().value("channel1").toBool()){
+    if(device->paramValue("channel1").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("channel2").toBool()){
+    if(device->paramValue("channel2").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("channel3").toBool()){
+    if(device->paramValue("channel3").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("channel4").toBool()){
+    if(device->paramValue("channel4").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("channel5").toBool()){
+    if(device->paramValue("channel5").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
@@ -258,33 +241,33 @@ DeviceManager::DeviceError DevicePluginElro::executeAction(Device *device, const
 
     // =======================================
     // Buttons
-    if(device->params().value("A").toBool()){
+    if(device->paramValue("A").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("B").toBool()){
+    if(device->paramValue("B").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("C").toBool()){
+    if(device->paramValue("C").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("D").toBool()){
+    if(device->paramValue("D").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
-    if(device->params().value("E").toBool()){
+    if(device->paramValue("E").toBool()){
         binCode.append("00");
     }else{
         binCode.append("01");
     }
     // Power
-    if(action.params().value("power").toBool()){
+    if(action.param("power").value().toBool()){
         binCode.append("0001");
     }else{
         binCode.append("0100");
@@ -312,7 +295,7 @@ DeviceManager::DeviceError DevicePluginElro::executeAction(Device *device, const
     // =======================================
     // send data to driver
     //qDebug() << "rawData" << rawData;
-    qDebug() << "transmit" << pluginName() << action.params().value("power").toBool();
+    qDebug() << "transmit" << pluginName() << action.param("power").value().toBool();
     transmitData(rawData);
     return DeviceManager::DeviceErrorNoError;
 }
@@ -409,11 +392,11 @@ void DevicePluginElro::radioData(QList<int> rawData)
     Device *device = 0;
     QList<Device*> deviceList = deviceManager()->findConfiguredDevices(elroRemoteId);
     foreach (Device *dev, deviceList) {
-        if (dev->params().contains("channel1") && dev->params().value("channel1").toBool() == group.at(0) &&
-                dev->params().contains("channel2") && dev->params().value("channel2").toBool() == group.at(1) &&
-                dev->params().contains("channel3") && dev->params().value("channel3").toBool() == group.at(2) &&
-                dev->params().contains("channel4") && dev->params().value("channel4").toBool() == group.at(3) &&
-                dev->params().contains("channel5") && dev->params().value("channel5").toBool() == group.at(4)
+        if (dev->hasParam("channel1") && dev->paramValue("channel1").toBool() == group.at(0) &&
+                dev->hasParam("channel2") && dev->paramValue("channel2").toBool() == group.at(1) &&
+                dev->hasParam("channel3") && dev->paramValue("channel3").toBool() == group.at(2) &&
+                dev->hasParam("channel4") && dev->paramValue("channel4").toBool() == group.at(3) &&
+                dev->hasParam("channel5") && dev->paramValue("channel5").toBool() == group.at(4)
                 ) {
             // Yippie! We found the device.
             device = dev;
@@ -425,8 +408,9 @@ void DevicePluginElro::radioData(QList<int> rawData)
         return;
     }
 
-    QVariantMap params;
-    params.insert("power", power);
+    QList<Param> params;
+    Param powerParam("power", power);
+    params.append(powerParam);
 
     // FIXME: find a better way to get to the remote DeviceClass
     DeviceClass deviceClass = supportedDevices().first();
diff --git a/plugins/deviceplugins/intertechno/devicepluginintertechno.cpp b/plugins/deviceplugins/intertechno/devicepluginintertechno.cpp
index 8d7dff2b..bff211a0 100644
--- a/plugins/deviceplugins/intertechno/devicepluginintertechno.cpp
+++ b/plugins/deviceplugins/intertechno/devicepluginintertechno.cpp
@@ -189,11 +189,9 @@ QList<DeviceClass> DevicePluginIntertechno::supportedDevices() const
     DeviceClass deviceClassIntertechnoRemote(pluginId(), intertechnoVendorId, intertechnoRemote);
     deviceClassIntertechnoRemote.setName("Intertechno Remote");
     
-    QVariantList remoteParams;
-    QVariantMap familyParam;
+    QList<ParamType> remoteParams;
     // family code = A-P
-    familyParam.insert("name", "familyCode");
-    familyParam.insert("type", "string");
+    ParamType familyParam("familyCode", QVariant::String);
     remoteParams.append(familyParam);
 
     deviceClassIntertechnoRemote.setParams(remoteParams);
@@ -309,11 +307,9 @@ QList<DeviceClass> DevicePluginIntertechno::supportedDevices() const
     DeviceClass deviceClassIntertechnoSwitch(pluginId(), intertechnoVendorId, intertechnoSwitch);
     deviceClassIntertechnoSwitch.setName("Intertechno Switch");
 
-    QVariantList switchDeviceParams;
-    QVariantMap buttonParam;
+    QList<ParamType> switchDeviceParams;
     // button code = 1-16
-    buttonParam.insert("name", "buttonCode");
-    buttonParam.insert("type", "int");
+    ParamType buttonParam("buttonCode", QVariant::Int);
 
     switchDeviceParams.append(familyParam);
     switchDeviceParams.append(buttonParam);
@@ -363,7 +359,7 @@ DeviceManager::DeviceError DevicePluginIntertechno::executeAction(Device *device
     QList<int> rawData;
     QByteArray binCode;
 
-    QString familyCode = device->params().value("familyCode").toString();
+    QString familyCode = device->paramValue("familyCode").toString();
 
     // =======================================
     // generate bin from family code
@@ -403,7 +399,7 @@ DeviceManager::DeviceError DevicePluginIntertechno::executeAction(Device *device
         return DeviceManager::DeviceErrorDeviceParameterError;
     }
 
-    QString buttonCode = device->params().value("buttonCode").toString();
+    QString buttonCode = device->paramValue("buttonCode").toString();
 
     // =======================================
     // generate bin from button code
@@ -449,7 +445,7 @@ DeviceManager::DeviceError DevicePluginIntertechno::executeAction(Device *device
 
     // =======================================
     // add power nibble
-    if(action.params().value("power").toBool()){
+    if(action.param("power").value().toBool()){
         binCode.append("0101");
     }else{
         binCode.append("0100");
@@ -476,7 +472,7 @@ DeviceManager::DeviceError DevicePluginIntertechno::executeAction(Device *device
 
     // =======================================
     // send data to driver
-    qDebug() << "transmit" << pluginName() << familyCode << buttonCode << action.params().value("power").toBool();
+    qDebug() << "transmit" << pluginName() << familyCode << buttonCode << action.param("power").value().toBool();
     transmitData(rawData);
 
     return DeviceManager::DeviceErrorNoError;
@@ -687,7 +683,7 @@ void DevicePluginIntertechno::radioData(QList<int> rawData)
     // ===================================================
     Device *device = 0;
     foreach (Device *dev, deviceList) {
-        if (dev->params().contains("familyCode") && dev->params().value("familyCode").toString() == familyCode) {
+        if (dev->paramValue("familyCode").toString() == familyCode) {
             // Yippie! We found the device.
             device = dev;
             break;
@@ -698,8 +694,9 @@ void DevicePluginIntertechno::radioData(QList<int> rawData)
         return;
     }
 
-    QVariantMap params;
-    params.insert("power", power);
+    QList<Param> params;
+    Param powerParam("power", power);
+    params.append(powerParam);
 
     // FIXME: find a better way to get to the remote DeviceClass
     DeviceClass deviceClass = supportedDevices().first();
diff --git a/plugins/deviceplugins/lircd/devicepluginlircd.cpp b/plugins/deviceplugins/lircd/devicepluginlircd.cpp
index 20cf462c..a9f6d5ad 100644
--- a/plugins/deviceplugins/lircd/devicepluginlircd.cpp
+++ b/plugins/deviceplugins/lircd/devicepluginlircd.cpp
@@ -37,10 +37,8 @@ QList<DeviceClass> DevicePluginLircd::supportedDevices() const
     DeviceClass deviceClassLircd(pluginId(), lircdVendorId, lircdDeviceClassId);
     deviceClassLircd.setName("IR Receiver");
 
-    QVariantList params;
-    QVariantMap remoteNameParam;
-    remoteNameParam.insert("name", "remoteName");
-    remoteNameParam.insert("type", "string");
+    QList<ParamType> params;
+    ParamType remoteNameParam("remoteName", QVariant::String);
     params.append(remoteNameParam);
     deviceClassLircd.setParams(params);
     
@@ -102,7 +100,7 @@ void DevicePluginLircd::buttonPressed(const QString &remoteName, const QString &
     Device *remote = nullptr;
     QList<Device*> configuredRemotes = deviceManager()->findConfiguredDevices(lircdDeviceClassId);
     foreach (Device *device, configuredRemotes) {
-        if (device->params().value("remoteName").toString() == remoteName) {
+        if (device->paramValue("remoteName").toString() == remoteName) {
             remote = device;
             break;
         }
@@ -115,9 +113,10 @@ void DevicePluginLircd::buttonPressed(const QString &remoteName, const QString &
     qDebug() << "found remote" << remoteName << supportedDevices().first().events().count();
     foreach (const EventType &eventType, supportedDevices().first().events()) {
         if (eventType.name() == buttonName) {
-            QVariantMap param;
-            param.insert("repeat", repeat);
-            Event event(eventType.id(), remote->id(), param);
+            QList<Param> params;
+            Param param("repeat", repeat);
+            params.append(param);
+            Event event(eventType.id(), remote->id(), params);
             emitEvent(event);
         }
     }
diff --git a/plugins/deviceplugins/mock/devicepluginmock.cpp b/plugins/deviceplugins/mock/devicepluginmock.cpp
index 0401833e..33501d99 100644
--- a/plugins/deviceplugins/mock/devicepluginmock.cpp
+++ b/plugins/deviceplugins/mock/devicepluginmock.cpp
@@ -54,10 +54,8 @@ QList<DeviceClass> DevicePluginMock::supportedDevices() const
     DeviceClass deviceClassMock(pluginId(), guhVendorId, mockDeviceClassId);
     deviceClassMock.setName("Mock Device");
 
-    QVariantList mockParams;
-    QVariantMap portParam;
-    portParam.insert("name", "httpport");
-    portParam.insert("type", "int");
+    QList<ParamType> mockParams;
+    ParamType portParam("httpport", QVariant::Int);
     mockParams.append(portParam);
 
     deviceClassMock.setParams(mockParams);
@@ -137,7 +135,7 @@ PluginId DevicePluginMock::pluginId() const
 
 bool DevicePluginMock::deviceCreated(Device *device)
 {
-    qDebug() << "Mockdevice created returning true" << device->params().value("httpport").toInt();
+    qDebug() << "Mockdevice created returning true" << device->paramValue("httpport").toInt();
 
     HttpDaemon *daemon = new HttpDaemon(device, this);
     m_daemons.insert(device, daemon);
@@ -169,8 +167,9 @@ bool DevicePluginMock::configureAutoDevice(QList<Device *> loadedDevices, Device
     }
 
     device->setName("Mock Device (Auto created)");
-    QVariantMap params;
-    params.insert("httpport", 4242);
+    QList<Param> params;
+    Param param("httpport", 4242);
+    params.append(param);
     device->setParams(params);
     return true;
 }
@@ -202,7 +201,7 @@ void DevicePluginMock::triggerEvent(const EventTypeId &id)
 
     Device *device = m_daemons.key(daemon);
 
-    Event event(id, device->id(), QVariantMap());
+    Event event(id, device->id());
 
     qDebug() << "Emitting event " << event.eventTypeId();
     emit emitEvent(event);
diff --git a/plugins/deviceplugins/mock/httpdaemon.cpp b/plugins/deviceplugins/mock/httpdaemon.cpp
index eef0c26d..388fd674 100644
--- a/plugins/deviceplugins/mock/httpdaemon.cpp
+++ b/plugins/deviceplugins/mock/httpdaemon.cpp
@@ -15,7 +15,7 @@
 HttpDaemon::HttpDaemon(Device *device, DevicePlugin *parent):
     QTcpServer(parent), disabled(false), m_plugin(parent), m_device(device)
 {
-    listen(QHostAddress::Any, device->params().value("httpport").toInt());
+    listen(QHostAddress::Any, device->paramValue("httpport").toInt());
 }
 
 void HttpDaemon::incomingConnection(qintptr socket)
diff --git a/plugins/deviceplugins/openweathermap/devicepluginopenweathermap.cpp b/plugins/deviceplugins/openweathermap/devicepluginopenweathermap.cpp
index 9f3c91b5..c63437a5 100644
--- a/plugins/deviceplugins/openweathermap/devicepluginopenweathermap.cpp
+++ b/plugins/deviceplugins/openweathermap/devicepluginopenweathermap.cpp
@@ -192,20 +192,14 @@ QList<DeviceClass> DevicePluginOpenweathermap::supportedDevices() const
     deviceClassOpenweathermap.setCreateMethod(DeviceClass::CreateMethodDiscovery);
 
     // Params
-    QVariantList params;
-    QVariantMap locationParam;
-    locationParam.insert("name", "location");
-    locationParam.insert("type", "string");
+    QList<ParamType> params;
+    ParamType locationParam("location", QVariant::String);
     params.append(locationParam);
 
-    QVariantMap countryParam;
-    countryParam.insert("name", "country");
-    countryParam.insert("type", "string");
+    ParamType countryParam("country", QVariant::String);
     params.append(countryParam);
 
-    QVariantMap idParam;
-    idParam.insert("name", "id");
-    idParam.insert("type", "string");
+    ParamType idParam("id", QVariant::String);
     params.append(idParam);
 
     deviceClassOpenweathermap.setParams(params);
@@ -310,7 +304,7 @@ DeviceManager::DeviceError DevicePluginOpenweathermap::discoverDevices(const Dev
 
 bool DevicePluginOpenweathermap::deviceCreated(Device *device)
 {
-    m_openweaher->update(device->params().value("id").toString());
+    m_openweaher->update(device->paramValue("id").toString());
     return true;
 }
 
@@ -323,7 +317,7 @@ DeviceManager::DeviceError DevicePluginOpenweathermap::executeAction(Device *dev
 {
     qDebug() << "execute action " << updateWeatherActionTypeId.toString();
     if(action.actionTypeId() == updateWeatherActionTypeId){
-        m_openweaher->update(device->params().value("id").toString());
+        m_openweaher->update(device->paramValue("id").toString());
     }
     return DeviceManager::DeviceErrorNoError;
 }
@@ -341,7 +335,7 @@ PluginId DevicePluginOpenweathermap::pluginId() const
 void DevicePluginOpenweathermap::guhTimer()
 {
     foreach (Device *device, deviceManager()->findConfiguredDevices(openweathermapDeviceClassId)) {
-        m_openweaher->update(device->params().value("id").toString());
+        m_openweaher->update(device->paramValue("id").toString());
     }
 }
 
@@ -350,10 +344,13 @@ void DevicePluginOpenweathermap::searchResultsReady(const QList<QVariantMap> &ci
     QList<DeviceDescriptor> retList;
     foreach (QVariantMap elemant, cityList) {
         DeviceDescriptor descriptor(openweathermapDeviceClassId, elemant.value("name").toString(),elemant.value("country").toString());
-        QVariantMap params;
-        params.insert("location", elemant.value("name"));
-        params.insert("country", elemant.value("country"));
-        params.insert("id", elemant.value("id"));
+        QList<Param> params;
+        Param locationParam("location", elemant.value("name"));
+        params.append(locationParam);
+        Param countryParam("country", elemant.value("country"));
+        params.append(countryParam);
+        Param idParam("id", elemant.value("id"));
+        params.append(idParam);
         descriptor.setParams(params);
         retList.append(descriptor);
     }
@@ -373,7 +370,7 @@ void DevicePluginOpenweathermap::weatherDataReady(const QByteArray &data)
     QVariantMap dataMap = jsonDoc.toVariant().toMap();
 
     foreach (Device *device, deviceManager()->findConfiguredDevices(openweathermapDeviceClassId)) {
-        if(device->params().value("id").toString() == dataMap.value("id").toString()){
+        if(device->paramValue("id").toString() == dataMap.value("id").toString()){
 
             if(dataMap.contains("clouds")){
                 int cloudiness = dataMap.value("clouds").toMap().value("all").toInt();
diff --git a/plugins/deviceplugins/wifidetector/devicepluginwifidetector.cpp b/plugins/deviceplugins/wifidetector/devicepluginwifidetector.cpp
index c71f4da2..192a8649 100644
--- a/plugins/deviceplugins/wifidetector/devicepluginwifidetector.cpp
+++ b/plugins/deviceplugins/wifidetector/devicepluginwifidetector.cpp
@@ -48,10 +48,8 @@ QList<DeviceClass> DevicePluginWifiDetector::supportedDevices() const
     DeviceClass deviceClassWifiDetector(pluginId(), guhVendorId, detectorId);
     deviceClassWifiDetector.setName("WiFi Device");
     
-    QVariantList detectorParams;
-    QVariantMap macParam;
-    macParam.insert("name", "mac");
-    macParam.insert("type", "string");
+    QList<ParamType> detectorParams;
+    ParamType macParam("mac", QVariant::String);
     detectorParams.append(macParam);
 
     deviceClassWifiDetector.setParams(detectorParams);
@@ -123,7 +121,7 @@ void DevicePluginWifiDetector::processFinished(int exitCode, QProcess::ExitStatu
 
     foreach (Device *device, watchedDevices) {
         bool wasInRange = device->stateValue(inRangeStateTypeId).toBool();
-        bool wasFound = foundDevices.contains(device->params().value("mac").toString().toLower());
+        bool wasFound = foundDevices.contains(device->paramValue("mac").toString().toLower());
         if (wasInRange != wasFound) {
             device->setStateValue(inRangeStateTypeId, wasFound);
         }
diff --git a/server/jsonrpc/actionhandler.cpp b/server/jsonrpc/actionhandler.cpp
index 7db2f734..e3dfab3a 100644
--- a/server/jsonrpc/actionhandler.cpp
+++ b/server/jsonrpc/actionhandler.cpp
@@ -48,7 +48,7 @@ JsonReply* ActionHandler::ExecuteAction(const QVariantMap &params)
 
     DeviceId deviceId(params.value("deviceId").toString());
     ActionTypeId actionTypeId(params.value("actionTypeId").toString());
-    QVariantMap actionParams = params.value("params").toMap();
+    QList<Param> actionParams = JsonTypes::unpackParams(params.value("params").toList());
 
     Action action(deviceId, actionTypeId);
     action.setParams(actionParams);
diff --git a/server/jsonrpc/devicehandler.cpp b/server/jsonrpc/devicehandler.cpp
index 3fbcaf10..1a4def26 100644
--- a/server/jsonrpc/devicehandler.cpp
+++ b/server/jsonrpc/devicehandler.cpp
@@ -250,7 +250,12 @@ JsonReply* DeviceHandler::SetPluginConfiguration(const QVariantMap &params)
 JsonReply* DeviceHandler::AddConfiguredDevice(const QVariantMap &params)
 {
     DeviceClassId deviceClass(params.value("deviceClassId").toString());
-    QVariantMap deviceParams = params.value("deviceParams").toMap();
+    QList<Param> deviceParams;
+    foreach (const QString &paramName, params.value("deviceParams").toMap().keys()) {
+         Param param(paramName);
+         param.setValue(params.value("deviceParams").toMap().value(paramName));
+         deviceParams.append(param);
+    }
     DeviceDescriptorId deviceDescriptorId(params.value("deviceDescriptorId").toString());
     DeviceId newDeviceId = DeviceId::createDeviceId();
     DeviceManager::DeviceError status;
diff --git a/server/jsonrpc/jsontypes.cpp b/server/jsonrpc/jsontypes.cpp
index b9373f85..2b81f1da 100644
--- a/server/jsonrpc/jsontypes.cpp
+++ b/server/jsonrpc/jsontypes.cpp
@@ -31,6 +31,7 @@ QVariantList JsonTypes::s_basicTypes;
 QVariantList JsonTypes::s_ruleTypes;
 QVariantList JsonTypes::s_createMethodTypes;
 QVariantList JsonTypes::s_setupMethodTypes;
+QVariantList JsonTypes::s_operandTypes;
 
 QVariantMap JsonTypes::s_paramType;
 QVariantMap JsonTypes::s_param;
@@ -54,16 +55,19 @@ void JsonTypes::init()
     s_ruleTypes << "RuleTypeMatchAll" << "RuleTypeMatchAny";
     s_createMethodTypes << "CreateMethodUser" << "CreateMethodAuto" << "CreateMethodDiscovery";
     s_setupMethodTypes << "SetupMethodJustAdd" << "SetupMethodDisplayPin" << "SetupMethodEnterPin" << "SetupMethodPushButton";
+    s_operandTypes << "OperandTypeEquals" << "OperandTypeNotEquals" << "OperandTypeLess" << "OperandTypeGreater" << "OperandTypeLessThan" << "OperandTypeGreaterThan";
 
     // ParamType
     s_paramType.insert("name", "string");
     s_paramType.insert("type", basicTypesRef());
-//    s_paramType.insert("default", "value");
-//    s_paramType.insert("value", "value");
+    s_paramType.insert("o:defaultValue", "value");
+    s_paramType.insert("o:minValue", "value");
+    s_paramType.insert("o:maxValue", "value");
 
     // Param
     s_param.insert("name", "string");
     s_param.insert("value", basicTypesRef());
+    s_param.insert("operand", operandTypesRef());
 
     // StateType
     s_stateType.insert("id", "uuid");
@@ -147,6 +151,7 @@ QVariantMap JsonTypes::allTypes()
     allTypes.insert("ParamType", paramTypeDescription());
     allTypes.insert("CreateMethodType", createMethodTypes());
     allTypes.insert("SetupMethodType", setupMethodTypes());
+    allTypes.insert("OperandType", operandTypes());
     allTypes.insert("StateType", stateTypeDescription());
     allTypes.insert("EventType", eventTypeDescription());
     allTypes.insert("ActionType", actionTypeDescription());
@@ -178,7 +183,11 @@ QVariantMap JsonTypes::packEvent(const Event &event)
     QVariantMap variant;
     variant.insert("eventTypeId", event.eventTypeId());
     variant.insert("deviceId", event.deviceId());
-    variant.insert("params", event.params());
+    QVariantList params;
+    foreach (const Param &param, event.params()) {
+        params.append(packParam(param));
+    }
+    variant.insert("params", params);
     return variant;
 }
 
@@ -196,7 +205,11 @@ QVariantMap JsonTypes::packAction(const Action &action)
     QVariantMap variant;
     variant.insert("actionTypeId", action.actionTypeId());
     variant.insert("deviceId", action.deviceId());
-    variant.insert("params", action.params());
+    QVariantList params;
+    foreach (const Param &param, action.params()) {
+        params.append(packParam(param));
+    }
+    variant.insert("params", params);
     return variant;
 }
 
@@ -210,6 +223,32 @@ QVariantMap JsonTypes::packStateType(const StateType &stateType)
     return variantMap;
 }
 
+QVariantMap JsonTypes::packParam(const Param &param)
+{
+    QVariantMap variantMap;
+    variantMap.insert("name", param.name());
+    variantMap.insert("value", param.value());
+    variantMap.insert("operand", s_operandTypes.at(param.operand()));
+    return variantMap;
+}
+
+QVariantMap JsonTypes::packParamType(const ParamType &paramType)
+{
+    QVariantMap variantMap;
+    variantMap.insert("name", paramType.name());
+    variantMap.insert("type", QVariant::typeToName(paramType.type()));
+    if (paramType.defaultValue().isValid()) {
+        variantMap.insert("defaultValue", paramType.defaultValue());
+    }
+    if (paramType.minValue().isValid()) {
+        variantMap.insert("minValue", paramType.minValue());
+    }
+    if (paramType.maxValue().isValid()) {
+        variantMap.insert("maxValue", paramType.maxValue());
+    }
+    return variantMap;
+}
+
 QVariantMap JsonTypes::packVendor(const Vendor &vendor)
 {
     QVariantMap variantMap;
@@ -235,7 +274,12 @@ QVariantMap JsonTypes::packDeviceClass(const DeviceClass &deviceClass)
     foreach (const ActionType &actionType, deviceClass.actions()) {
         actionTypes.append(packActionType(actionType));
     }
-    variant.insert("params", deviceClass.params());
+    QVariantList paramTypes;
+    foreach (const ParamType &paramType, deviceClass.params()) {
+        paramTypes.append(packParamType(paramType));
+    }
+
+    variant.insert("params", paramTypes);
     variant.insert("states", stateTypes);
     variant.insert("events", eventTypes);
     variant.insert("actions", actionTypes);
@@ -257,7 +301,11 @@ QVariantMap JsonTypes::packDevice(Device *device)
     variant.insert("id", device->id());
     variant.insert("deviceClassId", device->deviceClassId());
     variant.insert("name", device->name());
-    variant.insert("params", device->params());
+    QVariantList params;
+    foreach (const Param &param, device->params()) {
+        params.append(packParam(param));
+    }
+    variant.insert("params", params);
     return variant;
 }
 
@@ -293,6 +341,35 @@ QVariantMap JsonTypes::packRule(const Rule &rule)
     return ruleMap;
 }
 
+Param JsonTypes::unpackParam(const QVariantMap &paramMap)
+{
+    Param param(paramMap.value("name").toString(), paramMap.value("value"));
+    QString operandString = paramMap.value("operand").toString();
+    if (operandString == "OperandTypeEquals") {
+        param.setOperand(Param::OperandTypeEquals);
+    } else if (operandString == "OperandTypeNotEquals") {
+        param.setOperand(Param::OperandTypeNotEquals);
+    } else if (operandString == "OperandTypeLess") {
+        param.setOperand(Param::OperandTypeLess);
+    } else if (operandString == "OperandTypeGreater") {
+        param.setOperand(Param::OperandTypeGreater);
+    } else if (operandString == "OperandTypeLessThan") {
+        param.setOperand(Param::OperandTypeLessThan);
+    } else if (operandString == "OperandTypeGreaterThan") {
+        param.setOperand(Param::OperandTypeGreaterThan);
+    }
+    return param;
+}
+
+QList<Param> JsonTypes::unpackParams(const QVariantList &paramList)
+{
+    QList<Param> params;
+    foreach (const QVariant &paramVariant, paramList) {
+        params.append(unpackParam(paramVariant.toMap()));
+    }
+    return params;
+}
+
 QPair<bool, QString> JsonTypes::validateMap(const QVariantMap &templateMap, const QVariantMap &map)
 {
     s_lastError.clear();
@@ -333,6 +410,7 @@ QPair<bool, QString> JsonTypes::validateMap(const QVariantMap &templateMap, cons
 
 QPair<bool, QString> JsonTypes::validateProperty(const QVariant &templateValue, const QVariant &value)
 {
+    qDebug() << "validating property. template:" << templateValue << "got:" << value;
     QString strippedTemplateValue = templateValue.toString();
 
     if (strippedTemplateValue == "variant") {
@@ -378,20 +456,26 @@ QPair<bool, QString> JsonTypes::validateVariant(const QVariant &templateVariant,
     case QVariant::String:
         if (templateVariant.toString().startsWith("$ref:")) {
             QString refName = templateVariant.toString();
-            if (refName == JsonTypes::actionRef()) {
+            if (refName == actionRef()) {
                 qDebug() << "validating action";
                 QPair<bool, QString> result = validateMap(actionDescription(), variant.toMap());
                 if (!result.first) {
                     qDebug() << "Error validating action";
                     return result;
                 }
-            } else if (refName == JsonTypes::eventRef()) {
+            } else if (refName == eventRef()) {
                 qDebug() << "validating event";
                 QPair<bool, QString> result = validateMap(eventDescription(), variant.toMap());
                 if (!result.first) {
                     qDebug() << "event not valid";
                     return result;
                 }
+            } else if (refName == paramRef()) {
+                QPair<bool, QString> result = validateMap(paramDescription(), variant.toMap());
+                if (!result.first) {
+                    qDebug() << "Param not valid";
+                    return result;
+                }
             } else if (refName == deviceRef()) {
                 QPair<bool, QString> result = validateMap(deviceDescription(), variant.toMap());
                 if (!result.first) {
@@ -475,6 +559,12 @@ QPair<bool, QString> JsonTypes::validateVariant(const QVariant &templateVariant,
                     qDebug() << "value not allowed in" << createMethodTypesRef();
                     return result;
                 }
+            } else if (refName == operandTypesRef()) {
+                QPair<bool, QString> result = validateOperandType(variant);
+                if (!result.first) {
+                    qDebug() << QString("value %1 not allowed in %2").arg(variant.toString()).arg(operandTypesRef());
+                    return result;
+                }
             } else {
                 qDebug() << "unhandled ref:" << refName;
                 return report(false, QString("Unhandled ref %1. Server implementation incomplete.").arg(refName));
@@ -543,3 +633,8 @@ QPair<bool, QString> JsonTypes::validateSetupMethodType(const QVariant &variant)
 {
     return report(s_setupMethodTypes.contains(variant.toString()), QString("Unknwon setupMethod type %1").arg(variant.toString()));
 }
+
+QPair<bool, QString> JsonTypes::validateOperandType(const QVariant &variant)
+{
+    return report(s_operandTypes.contains(variant.toString()), QString("Unknown operand type %1").arg(variant.toString()));
+}
diff --git a/server/jsonrpc/jsontypes.h b/server/jsonrpc/jsontypes.h
index 5a701147..30e1eb72 100644
--- a/server/jsonrpc/jsontypes.h
+++ b/server/jsonrpc/jsontypes.h
@@ -26,6 +26,7 @@
 #include "types/event.h"
 #include "types/action.h"
 #include "types/actiontype.h"
+#include "types/paramtype.h"
 
 #include <QObject>
 
@@ -66,6 +67,7 @@ public:
     DECLARE_TYPE(ruleTypes, "RuleType")
     DECLARE_TYPE(createMethodTypes, "CreateMethodType")
     DECLARE_TYPE(setupMethodTypes, "SetupMethodType")
+    DECLARE_TYPE(operandTypes, "OperandType")
     DECLARE_OBJECT(paramType, "ParamType")
     DECLARE_OBJECT(param, "Param")
     DECLARE_OBJECT(stateType, "StateType")
@@ -86,6 +88,8 @@ public:
     static QVariantMap packActionType(const ActionType &actionType);
     static QVariantMap packAction(const Action &action);
     static QVariantMap packStateType(const StateType &stateType);
+    static QVariantMap packParam(const Param &param);
+    static QVariantMap packParamType(const ParamType &paramType);
     static QVariantMap packVendor(const Vendor &vendor);
     static QVariantMap packDeviceClass(const DeviceClass &deviceClass);
     static QVariantMap packPlugin(DevicePlugin *plugin);
@@ -93,6 +97,9 @@ public:
     static QVariantMap packDeviceDescriptor(const DeviceDescriptor &descriptor);
     static QVariantMap packRule(const Rule &rule);
 
+    static Param unpackParam(const QVariantMap &paramMap);
+    static QList<Param> unpackParams(const QVariantList &paramList);
+
     static QPair<bool, QString> validateMap(const QVariantMap &templateMap, const QVariantMap &map);
     static QPair<bool, QString> validateProperty(const QVariant &templateValue, const QVariant &value);
     static QPair<bool, QString> validateList(const QVariantList &templateList, const QVariantList &list);
@@ -101,6 +108,7 @@ public:
     static QPair<bool, QString> validateRuleType(const QVariant &variant);
     static QPair<bool, QString> validateCreateMethodType(const QVariant &variant);
     static QPair<bool, QString> validateSetupMethodType(const QVariant &variant);
+    static QPair<bool, QString> validateOperandType(const QVariant &variant);
 
 private:
     static bool s_initialized;
diff --git a/server/jsonrpc/ruleshandler.cpp b/server/jsonrpc/ruleshandler.cpp
index 5a9964c6..f651a5f4 100644
--- a/server/jsonrpc/ruleshandler.cpp
+++ b/server/jsonrpc/ruleshandler.cpp
@@ -82,7 +82,7 @@ JsonReply* RulesHandler::AddRule(const QVariantMap &params)
 
     EventTypeId eventTypeId(eventMap.value("eventTypeId").toString());
     DeviceId eventDeviceId(eventMap.value("deviceId").toString());
-    QVariantMap eventParams = eventMap.value("params").toMap();
+    QList<Param> eventParams = JsonTypes::unpackParams(eventMap.value("params").toList());
     Event event(eventTypeId, eventDeviceId, eventParams);
 
     QList<Action> actions;
@@ -91,7 +91,7 @@ JsonReply* RulesHandler::AddRule(const QVariantMap &params)
     foreach (const QVariant &actionVariant, actionList) {
         QVariantMap actionMap = actionVariant.toMap();
         Action action(DeviceId(actionMap.value("deviceId").toString()), ActionTypeId(actionMap.value("actionTypeId").toString()));
-        action.setParams(actionMap.value("params").toMap());
+        action.setParams(JsonTypes::unpackParams(actionMap.value("params").toList()));
         actions.append(action);
     }
 
diff --git a/server/ruleengine.cpp b/server/ruleengine.cpp
index 60684302..57f220b1 100644
--- a/server/ruleengine.cpp
+++ b/server/ruleengine.cpp
@@ -80,7 +80,17 @@ RuleEngine::RuleEngine(QObject *parent) :
         settings.beginGroup("event");
         EventTypeId eventTypeId(settings.value("eventTypeId").toString());
         DeviceId deviceId(settings.value("deviceId").toString());
-        Event event(eventTypeId, deviceId, settings.value("params").toMap());
+        QList<Param> params;
+        foreach (QString groupName, settings.childGroups()) {
+            if (groupName.startsWith("Param-")) {
+                settings.beginGroup(groupName);
+                Param param(groupName.remove(QRegExp("^Param-")), settings.value("value"));
+                param.setOperand((Param::OperandType)settings.value("operand").toInt());
+                params.append(param);
+                settings.endGroup();
+            }
+        }
+        Event event(eventTypeId, deviceId, params);
         settings.endGroup();
 
         settings.beginGroup("states");
@@ -99,7 +109,18 @@ RuleEngine::RuleEngine(QObject *parent) :
         foreach (const QString &actionIdString, settings.childGroups()) {
             settings.beginGroup(actionIdString);
             Action action = Action(DeviceId(settings.value("deviceId").toString()), ActionTypeId(settings.value("actionTypeId").toString()));
-            action.setParams(settings.value("params").toMap());
+            QList<Param> params;
+            foreach (QString paramNameString, settings.childGroups()) {
+                if (paramNameString.startsWith("Param-")) {
+                    settings.beginGroup(paramNameString);
+                    Param param(paramNameString.remove(QRegExp("^Param-")), settings.value("value"));
+                    param.setOperand((Param::OperandType)settings.value("operand").toInt());
+                    params.append(param);
+                    settings.endGroup();
+                }
+            }
+            action.setParams(params);
+
             settings.endGroup();
             actions.append(action);
         }
@@ -187,7 +208,13 @@ RuleEngine::RuleError RuleEngine::addRule(const Event &event, const QList<State>
     settings.beginGroup("event");
     settings.setValue("eventTypeId", event.eventTypeId());
     settings.setValue("deviceId", event.deviceId());
-    settings.setValue("params", event.params());
+    foreach (const Param &param, event.params()) {
+        settings.beginGroup("Param-" + param.name());
+        settings.setValue("value", param.value());
+        settings.setValue("operand", param.operand());
+        settings.endGroup();
+    }
+
     settings.endGroup();
 
     settings.beginGroup("states");
@@ -205,7 +232,12 @@ RuleEngine::RuleError RuleEngine::addRule(const Event &event, const QList<State>
         settings.beginGroup(action.actionTypeId().toString());
         settings.setValue("deviceId", action.deviceId());
         settings.setValue("actionTypeId", action.actionTypeId());
-        settings.setValue("params", action.params());
+        foreach (const Param &param, action.params()) {
+            settings.beginGroup("Param-" + param.name());
+            settings.setValue("value", param.value());
+            settings.endGroup();
+        }
+
         settings.endGroup();
     }
 
diff --git a/tests/auto/testjsonrpc.cpp b/tests/auto/testjsonrpc.cpp
index 78282ae9..f4b31f51 100644
--- a/tests/auto/testjsonrpc.cpp
+++ b/tests/auto/testjsonrpc.cpp
@@ -315,6 +315,7 @@ void TestJSONRPC::getConfiguredDevices()
     QVariant response = injectAndWait("Devices.GetConfiguredDevices");
 
     QVariantList devices = response.toMap().value("params").toMap().value("devices").toList();
+    qDebug() << "got devices" << devices;
     QCOMPARE(devices.count(), 2); // There should be one auto created mock device and the one created in initTestcase()
 }