diff --git a/libsrc/leddevice/LedDevice.cpp b/libsrc/leddevice/LedDevice.cpp
index 8da0ba5a..ea144b99 100644
--- a/libsrc/leddevice/LedDevice.cpp
+++ b/libsrc/leddevice/LedDevice.cpp
@@ -40,8 +40,19 @@ LedDevice::~LedDevice()
 
 int LedDevice::open()
 {
-	setEnable (true);
-	return 0;
+	int retval = -1;
+	QString errortext;
+	_deviceReady = false;
+
+	// General initialisation and configuration of LedDevice
+	if ( init(_devConfig) )
+	{
+			// Everything is OK -> enable device
+			_deviceReady = true;
+			setEnable(true);
+			retval = 0;
+	}
+	return retval;
 }
 
 void LedDevice::setInError(const QString& errorMsg)
@@ -71,6 +82,11 @@ void LedDevice::setEnable(bool enable)
 			Error(_log, "Device '%s' cannot be enabled, as it is not ready!", QSTRING_CSTR(_activeDeviceType));
 			return;
 		}
+		else
+		{
+			// Open worked
+			_deviceInError = false;
+		}
 	}
 
 	// emit signal when state changed
@@ -101,6 +117,8 @@ void LedDevice::setActiveDeviceType(const QString& deviceType)
 
 bool LedDevice::init(const QJsonObject &deviceConfig)
 {
+	//Debug(_log, "deviceConfig: [%s]", QString(QJsonDocument(_devConfig).toJson(QJsonDocument::Compact)).toUtf8().constData() );
+
 	_colorOrder = deviceConfig["colorOrder"].toString("RGB");
 	_activeDeviceType = deviceConfig["type"].toString("file").toLower();
 	setLedCount(static_cast<unsigned int>( deviceConfig["currentLedCount"].toInt(1) )); // property injected to reflect real led count
@@ -146,7 +164,7 @@ void LedDevice::stopRefreshTimer()
 int LedDevice::updateLeds(const std::vector<ColorRgb>& ledValues)
 {
 	int retval = 0;
-	if ( !_deviceReady )
+	if ( !_deviceReady || _deviceInError)
 	{
 		std::cout << "LedDevice::updateLeds(), LedDevice NOT ready!" <<  std::endl;
 		return -1;
diff --git a/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.cpp b/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.cpp
index ca93aa76..add73c98 100644
--- a/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.cpp
+++ b/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.cpp
@@ -11,6 +11,11 @@ LedDeviceWS281x::~LedDeviceWS281x()
 {
 }
 
+LedDevice* LedDeviceWS281x::construct(const QJsonObject &deviceConfig)
+{
+	return new LedDeviceWS281x(deviceConfig);
+}
+
 bool LedDeviceWS281x::init(const QJsonObject &deviceConfig)
 {
 	QString errortext;
@@ -84,11 +89,6 @@ void LedDeviceWS281x::close()
 	}
 }
 
-LedDevice* LedDeviceWS281x::construct(const QJsonObject &deviceConfig)
-{
-	return new LedDeviceWS281x(deviceConfig);
-}
-
 // Send new values down the LED chain
 int LedDeviceWS281x::write(const std::vector<ColorRgb> &ledValues)
 {
diff --git a/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.h b/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.h
index 2af413f4..a6dc6c4e 100644
--- a/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.h
+++ b/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.h
@@ -15,12 +15,12 @@ public:
 	///
 	/// @param deviceConfig json device config
 	///
-	LedDeviceWS281x(const QJsonObject &deviceConfig);
+	explicit LedDeviceWS281x(const QJsonObject &deviceConfig);
 
 	///
 	/// Destructor of the LedDevice, waits for DMA to complete and then cleans up
 	///
-	~LedDeviceWS281x() override;
+	virtual ~LedDeviceWS281x() override;
 
 	/// constructs leddevice
 	static LedDevice* construct(const QJsonObject &deviceConfig);
@@ -30,7 +30,7 @@ public:
 	///
 	/// @param deviceConfig the json device config
 	/// @return true if success
-	bool init(const QJsonObject &deviceConfig) override;
+	virtual bool init(const QJsonObject &deviceConfig) override;
 
 public slots:
 	///
@@ -39,7 +39,7 @@ public slots:
 	///
 	virtual void close() override;
 
-private:
+protected:
 	///
 	/// Writes the led color values to the led-device
 	///
@@ -48,6 +48,8 @@ private:
 	///
 	virtual int write(const std::vector<ColorRgb> &ledValues) override;
 
+private:
+
 	ws2811_t    _led_string;
 	int         _channel;
 	RGBW::WhiteAlgorithm _whiteAlgorithm;
diff --git a/libsrc/leddevice/dev_serial/LedDeviceKarate.cpp b/libsrc/leddevice/dev_serial/LedDeviceKarate.cpp
index 44b20af5..647ac221 100644
--- a/libsrc/leddevice/dev_serial/LedDeviceKarate.cpp
+++ b/libsrc/leddevice/dev_serial/LedDeviceKarate.cpp
@@ -46,7 +46,7 @@ bool LedDeviceKarate::init(const QJsonObject &deviceConfig)
 
 int LedDeviceKarate::write(const std::vector<ColorRgb> &ledValues)
 {
-	for (signed iLed=0; iLed<_ledCount; iLed++)
+	for (signed iLed=0; iLed< static_cast<int>(_ledCount); iLed++)
         {
 		
        		const ColorRgb& rgb = ledValues[iLed];