diff --git a/doc/examples/piiodevice.cpp b/doc/examples/piiodevice.cpp
index 0946dc16..c8ea515f 100644
--- a/doc/examples/piiodevice.cpp
+++ b/doc/examples/piiodevice.cpp
@@ -7,19 +7,19 @@ class SomeIO: public PIIODevice {
 public:
 	SomeIO(): PIIODevice() {}
 protected:
-	bool openDevice() {
+	bool openDevice() override {
 		// open your device here
 		return if_success;
 	}
-	int read(void * read_to, int max_size) {
+	int readDevice(void * read_to, int max_size) override {
 		// read from your device here
 		return readed_bytes;
 	}
-	int write(const void * data, int max_size) {
+	int writeDevice(const void * data, int max_size) override {
 		// write to your device here
 		return written_bytes;
 	}
-	void configureFromFullPath(const PIString & full_path) {
+	void configureFromFullPathDevice(const PIString & full_path) override {
 		// parse full_path and configure device here
 	}
 };
@@ -38,7 +38,7 @@ ser.configure("example.conf", "dev");
 //! [configureDevice]
 class SomeIO: public PIIODevice {
 	...
-	bool configureDevice(const void * e_main, const void * e_parent) {
+	bool configureDevice(const void * e_main, const void * e_parent) override {
 		PIConfig::Entry * em = (PIConfig::Entry * )e_main;
 		PIConfig::Entry * ep = (PIConfig::Entry * )e_parent;
 		setStringParam(readDeviceSetting<PIString>("stringParam", stringParam(), em, ep));
diff --git a/libs/main/cloud/picloudclient.h b/libs/main/cloud/picloudclient.h
index 4d21cb1d..4bd1276d 100644
--- a/libs/main/cloud/picloudclient.h
+++ b/libs/main/cloud/picloudclient.h
@@ -42,16 +42,17 @@ public:
 	void setServerName(const PIString & server_name);
 	void setKeepConnection(bool on);
 	bool isConnected() const {return is_connected;}
+	ssize_t bytesAvailible() const override {return buff.size();}
 
 	EVENT(connected);
 	EVENT(disconnected);
 
 protected:
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int size) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+	bool openDevice() override;
+	bool closeDevice() override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int size) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
 
 private:
 	EVENT_HANDLER1(void, _readed, PIByteArray &, data);
diff --git a/libs/main/cloud/picloudserver.h b/libs/main/cloud/picloudserver.h
index 3936f0d3..4e3b7fd7 100644
--- a/libs/main/cloud/picloudserver.h
+++ b/libs/main/cloud/picloudserver.h
@@ -45,11 +45,12 @@ public:
 		Client(PICloudServer * srv = nullptr, uint id = 0);
 		virtual ~Client();
 	protected:
-		virtual bool openDevice() override;
-		virtual bool closeDevice() override;
-		virtual int readDevice(void * read_to, int max_size) override;
-		virtual int writeDevice(const void * data, int size) override;
-		virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+		bool openDevice() override;
+		bool closeDevice() override;
+		int readDevice(void * read_to, int max_size) override;
+		int writeDevice(const void * data, int size) override;
+		DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+		ssize_t bytesAvailible() const override {return buff.size();}
 
 	private:
 		void pushBuffer(const PIByteArray & ba);
@@ -68,10 +69,10 @@ public:
 	EVENT1(newConnection, PICloudServer::Client * , client);
 
 protected:
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
+	bool openDevice() override;
+	bool closeDevice() override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
 
 private:
 	EVENT_HANDLER1(void, _readed, PIByteArray &, ba);
diff --git a/libs/main/console/pikbdlistener.h b/libs/main/console/pikbdlistener.h
index 9dcfca87..3dc32283 100644
--- a/libs/main/console/pikbdlistener.h
+++ b/libs/main/console/pikbdlistener.h
@@ -205,9 +205,9 @@ public:
 	static PIKbdListener * instance() {return _object;}
 
 private:
-	void begin();
-	void run() {readKeyboard();}
-	void end();
+	void begin() override;
+	void run() override {readKeyboard();}
+	void end() override;
 
 #ifndef WINDOWS
 	struct PIP_EXPORT EscSeq {
diff --git a/libs/main/console/piscreen.h b/libs/main/console/piscreen.h
index d590c56f..576cf232 100644
--- a/libs/main/console/piscreen.h
+++ b/libs/main/console/piscreen.h
@@ -134,9 +134,9 @@ private:
 		PIVector<PIVector<PIScreenTypes::Cell> > cells, pcells;
 	};
 
-	void begin();
-	void run();
-	void end();
+	void begin() override;
+	void run() override;
+	void end() override;
 	void key_event(PIKbdListener::KeyEvent key);
 	EVENT_HANDLER1(void, mouse_event, PIKbdListener::MouseEvent, me);
 	EVENT_HANDLER1(void, wheel_event, PIKbdListener::WheelEvent, we);
@@ -145,9 +145,9 @@ private:
 	PIVector<PIScreenTile*> prepareMouse(PIKbdListener::MouseEvent * e);
 	PIVector<PIScreenTile*> tilesUnderMouse(int x, int y);
 	bool nextFocus(PIScreenTile * rt, PIKbdListener::KeyEvent key = PIKbdListener::KeyEvent());
-	void tileEventInternal(PIScreenTile * t, PIScreenTypes::TileEvent e);
-	void tileRemovedInternal(PIScreenTile * t);
-	void tileSetFocusInternal(PIScreenTile * t);
+	void tileEventInternal(PIScreenTile * t, PIScreenTypes::TileEvent e) override;
+	void tileRemovedInternal(PIScreenTile * t) override;
+	void tileSetFocusInternal(PIScreenTile * t) override;
 
 	bool mouse_;
 	SystemConsole console;
diff --git a/libs/main/console/piscreenconsole.h b/libs/main/console/piscreenconsole.h
index c650358d..60ddf9dc 100644
--- a/libs/main/console/piscreenconsole.h
+++ b/libs/main/console/piscreenconsole.h
@@ -64,8 +64,8 @@ protected:
 	};
 	PIVector<Variable> variables;
 	PIScreenTypes::Alignment alignment;
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
 };
 
 
diff --git a/libs/main/console/piscreentiles.h b/libs/main/console/piscreentiles.h
index 5a03f58c..62f83929 100644
--- a/libs/main/console/piscreentiles.h
+++ b/libs/main/console/piscreentiles.h
@@ -40,8 +40,8 @@ public:
 	PIVector<Row> content;
 	PIScreenTypes::Alignment alignment;
 protected:
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
 };
 
 
@@ -62,9 +62,9 @@ public:
 	int thickness;
 protected:
 	void _check();
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
-	bool mouseEvent(PIKbdListener::MouseEvent me);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
+	bool mouseEvent(PIKbdListener::MouseEvent me) override;
 	int minimum_, maximum_, value_;
 	PIChar line_char;
 };
@@ -93,12 +93,12 @@ public:
 	PISet<int> selected;
 	int lhei, cur, offset;
 protected:
-	void sizeHint(int & w, int & h) const;
-	void resizeEvent(int w, int h);
-	void drawEvent(PIScreenDrawer * d);
-	bool keyEvent(PIKbdListener::KeyEvent key);
-	bool mouseEvent(PIKbdListener::MouseEvent me);
-	bool wheelEvent(PIKbdListener::WheelEvent we);
+	void sizeHint(int & w, int & h) const override;
+	void resizeEvent(int w, int h) override;
+	void drawEvent(PIScreenDrawer * d) override;
+	bool keyEvent(PIKbdListener::KeyEvent key) override;
+	bool mouseEvent(PIKbdListener::MouseEvent me) override;
+	bool wheelEvent(PIKbdListener::WheelEvent we) override;
 	TileScrollBar * scroll;
 	bool mouse_sel;
 };
@@ -115,10 +115,10 @@ public:
 	PIScreenTypes::CellFormat format;
 	PIString text;
 protected:
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
-	bool keyEvent(PIKbdListener::KeyEvent key);
-	bool mouseEvent(PIKbdListener::MouseEvent me);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
+	bool keyEvent(PIKbdListener::KeyEvent key) override;
+	bool mouseEvent(PIKbdListener::MouseEvent me) override;
 };
 
 
@@ -137,10 +137,10 @@ public:
 	PIVector<Button> content;
 	int cur;
 protected:
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
-	bool keyEvent(PIKbdListener::KeyEvent key);
-	bool mouseEvent(PIKbdListener::MouseEvent me);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
+	bool keyEvent(PIKbdListener::KeyEvent key) override;
+	bool mouseEvent(PIKbdListener::MouseEvent me) override;
 	struct Rect {
 		Rect(int _x0 = 0, int _y0 = 0, int _x1 = 0, int _y1 = 0): x0(_x0),y0(_y0),x1(_x1),y1(_y1) {}
 		int x0,y0,x1,y1;
@@ -161,10 +161,10 @@ public:
 	PIString text;
 	bool toggled;
 protected:
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
-	bool keyEvent(PIKbdListener::KeyEvent key);
-	bool mouseEvent(PIKbdListener::MouseEvent me);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
+	bool keyEvent(PIKbdListener::KeyEvent key) override;
+	bool mouseEvent(PIKbdListener::MouseEvent me) override;
 };
 
 
@@ -179,8 +179,8 @@ public:
 	double maximum;
 	double value;
 protected:
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
 };
 
 
@@ -192,8 +192,8 @@ public:
 	PIScreenTypes::CellFormat format;
 	int max_lines;
 protected:
-	void drawEvent(PIScreenDrawer * d);
-	bool keyEvent(PIKbdListener::KeyEvent key);
+	void drawEvent(PIScreenDrawer * d) override;
+	bool keyEvent(PIKbdListener::KeyEvent key) override;
 };
 
 
@@ -206,9 +206,9 @@ public:
 	PIString text;
 	int max_length;
 protected:
-	void sizeHint(int & w, int & h) const;
-	void drawEvent(PIScreenDrawer * d);
-	bool keyEvent(PIKbdListener::KeyEvent key);
+	void sizeHint(int & w, int & h) const override;
+	void drawEvent(PIScreenDrawer * d) override;
+	bool keyEvent(PIKbdListener::KeyEvent key) override;
 	void reserCursor();
 	int cur, offset;
 	bool inv;
diff --git a/libs/main/console/piterminal.h b/libs/main/console/piterminal.h
index 65bd94a3..27efd41b 100644
--- a/libs/main/console/piterminal.h
+++ b/libs/main/console/piterminal.h
@@ -58,7 +58,7 @@ private:
 	void readConsole();
 	void getCursor(int & x, int & y);
 	uchar invertColor(uchar c);
-	void run();
+	void run() override;
 #ifndef WINDOWS
 	void parseInput(const PIString & s);
 	bool isCompleteEscSeq(const PIString & es);
diff --git a/libs/main/core/pibinarystream.h b/libs/main/core/pibinarystream.h
index c58a53f9..878d4d89 100644
--- a/libs/main/core/pibinarystream.h
+++ b/libs/main/core/pibinarystream.h
@@ -51,8 +51,9 @@ class PIBinaryStream {
 public:
 	// one should implement next methods:
 	//
-	// bool binaryStreamAppendImp(const void * d, size_t s);
-	// bool binaryStreamTakeImp  (      void * d, size_t s);
+	// bool binaryStreamAppendImp  (const void * d, size_t s);
+	// bool binaryStreamTakeImp    (void * d, size_t s);
+	// ssize_t binaryStreamSizeImp () const;
 
 	bool binaryStreamAppend(const void * d, size_t s) {
 		if (!static_cast<P*>(this)->binaryStreamAppendImp(d, s)) {
@@ -68,24 +69,16 @@ public:
 		}
 		return true;
 	}
+
+	ssize_t binaryStreamSize() const {
+		return static_cast<P*>(this)->binaryStreamSizeImp();
+	}
+
 	template<typename T>
 	void binaryStreamAppend(T v) {binaryStreamAppend(&v, sizeof(v));}
-	uchar binaryStreamTakeByte(bool * ok = nullptr) {
-		uchar r = 0;
-		if (binaryStreamTake(&r, sizeof(r))) {
-			if (ok) *ok = true;
-		} else {
-			if (ok) *ok = false;
-		}
-		return r;
-	}
-	int binaryStreamTakeInt(bool * ok = nullptr) {
+	int binaryStreamTakeInt() {
 		int r = 0;
-		if (binaryStreamTake(&r, sizeof(r))) {
-			if (ok) *ok = true;
-		} else {
-			if (ok) *ok = false;
-		}
+		binaryStreamTake(&r, sizeof(r));
 		return r;
 	}
 };
@@ -100,13 +93,27 @@ public:
 };
 
 
-template<typename P, typename T> inline PIBinaryStream<P> & operator <<(PIBinaryStreamTrivialRef<P> s, const T & v) {s.p << v; return s.p;}
-template<typename P, typename T> inline PIBinaryStream<P> & operator >>(PIBinaryStreamTrivialRef<P> s,       T & v) {s.p >> v; return s.p;}
+template<typename P, typename T> inline PIBinaryStream<P> & operator <<(PIBinaryStreamTrivialRef<P> s, const T & v) {
+	s.p << v;
+	return s.p;
+}
+template<typename P, typename T> inline PIBinaryStream<P> & operator >>(PIBinaryStreamTrivialRef<P> s,       T & v) {
+	s.p >> v;
+	return s.p;
+}
 
 
 // specify types
-template<typename P> inline PIBinaryStream<P> & operator <<(PIBinaryStream<P> & s, const bool    v) {s.binaryStreamAppend((uchar)v); return s;}
-template<typename P> inline PIBinaryStream<P> & operator >>(PIBinaryStream<P> & s,       bool  & v) {v = s.binaryStreamTakeByte();   return s;}
+template<typename P> inline PIBinaryStream<P> & operator <<(PIBinaryStream<P> & s, const bool    v) {
+	s.binaryStreamAppend((uchar)v);
+	return s;
+}
+template<typename P> inline PIBinaryStream<P> & operator >>(PIBinaryStream<P> & s,       bool  & v) {
+	uchar c;
+	s.binaryStreamTake(&c, sizeof(c));
+	v = c;
+	return s;
+}
 
 template<typename P> inline PIBinaryStream<P> & operator <<(PIBinaryStream<P> & s, const PIMemoryBlock v) {
 	s.binaryStreamAppend(v.data(), v.size());
diff --git a/libs/main/core/pibytearray.h b/libs/main/core/pibytearray.h
index 44acc974..b1262ca8 100644
--- a/libs/main/core/pibytearray.h
+++ b/libs/main/core/pibytearray.h
@@ -1136,13 +1136,15 @@ public:
 		return true;
 	}
 	bool binaryStreamTakeImp(void * d_, size_t s) {
-		if (size() < s)
-			return false;
-		memcpy(d_, data(), s);
-		remove(0, s);
-		return true;
+		size_t rs = size();
+		if (rs > s) rs = s;
+		memcpy(d_, data(), rs);
+		remove(0, rs);
+		return rs == s;
 	}
 
+	ssize_t binaryStreamSizeImp() const {return size();}
+
 private:
 	PIDeque<uchar> d;
 
diff --git a/libs/main/core/pistring.h b/libs/main/core/pistring.h
index 513794cc..aea019c8 100644
--- a/libs/main/core/pistring.h
+++ b/libs/main/core/pistring.h
@@ -1511,7 +1511,7 @@ BINARY_STREAM_WRITE(PIString) {s << v.d; return s;}
 //! \relatesalso PIByteArray
 //! \~english Restore operator.
 //! \~russian Оператор извлечения.
-BINARY_STREAM_READ(PIString) {v.d.clear(); s >> v.d; return s;}
+BINARY_STREAM_READ(PIString) {s >> v.d; return s;}
 
 
 //! \~english Returns concatenated string.
diff --git a/libs/main/core/pistringlist.h b/libs/main/core/pistringlist.h
index 66d4a047..53b3a1b7 100644
--- a/libs/main/core/pistringlist.h
+++ b/libs/main/core/pistringlist.h
@@ -127,15 +127,11 @@ public:
 
 
 BINARY_STREAM_WRITE(PIStringList) {
-	s.binaryStreamAppend(v.size());
-	for (int i = 0; i < v.size_s(); ++i)
-		s << v[i];
+	s << static_cast<const PIDeque<PIString> &>(v);
 	return s;
 }
 BINARY_STREAM_READ(PIStringList) {
-	v.resize(s.binaryStreamTakeInt());
-	for (int i = 0; i < v.size_s(); ++i)
-		s >> v[i];
+	s >> static_cast<PIDeque<PIString> &>(v);
 	return s;
 }
 
diff --git a/libs/main/core/pitextstream.h b/libs/main/core/pitextstream.h
index 4a8ab8cc..c5f7bbc3 100644
--- a/libs/main/core/pitextstream.h
+++ b/libs/main/core/pitextstream.h
@@ -147,8 +147,8 @@ public:
 	//! \~english Read character
 	//! \~russian Читает символ
 	char takeChar(bool * rok) {
-		bool ok = true;
-		char ret = (char)s->binaryStreamTakeByte(&ok);
+		char ret;
+		bool ok = s->binaryStreamTake(&ret, sizeof(ret));
 		if (!ok) is_end = true;
 		if (rok) *rok = ok;
 		return ret;
diff --git a/libs/main/io_devices/pibinarylog.cpp b/libs/main/io_devices/pibinarylog.cpp
index 217abecf..199210c0 100644
--- a/libs/main/io_devices/pibinarylog.cpp
+++ b/libs/main/io_devices/pibinarylog.cpp
@@ -409,8 +409,9 @@ int PIBinaryLog::readDevice(void *read_to, int max_size) {
 	if (max_size <= 0 || read_to == 0) return -1;
 	BinLogRecord br;
 	br.id = 0;
-	if (filterID.isEmpty()) br = readRecord();
-	else {
+	if (filterID.isEmpty()) {
+		br = readRecord();
+	} else {
 		while (!filterID.contains(br.id) && !isEnd()) br = readRecord();
 	}
 	if (br.id == -1) {
diff --git a/libs/main/io_devices/pibinarylog.h b/libs/main/io_devices/pibinarylog.h
index a88b1345..034088c1 100644
--- a/libs/main/io_devices/pibinarylog.h
+++ b/libs/main/io_devices/pibinarylog.h
@@ -301,18 +301,18 @@ public:
 	static bool joinBinLogsSerial(const PIStringList & src, const PIString & dst);
 
 protected:
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual int readDevice(void *read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int size) override;
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual void propertyChanged(const char * s) override;
-	virtual bool threadedRead(const uchar *readed, int size) override;
-	virtual void threadedReadTerminated() override {pausemutex.unlock();}
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	int readDevice(void *read_to, int max_size) override;
+	int writeDevice(const void * data, int size) override;
+	bool openDevice() override;
+	bool closeDevice() override;
+	void propertyChanged(const char * s) override;
+	bool threadedRead(const uchar *readed, int size) override;
+	void threadedReadTerminated() override {pausemutex.unlock();}
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
 
 private:
 	struct PIP_EXPORT BinLogRecord {
diff --git a/libs/main/io_devices/pican.h b/libs/main/io_devices/pican.h
index 65ae405d..c3c22e62 100644
--- a/libs/main/io_devices/pican.h
+++ b/libs/main/io_devices/pican.h
@@ -41,15 +41,15 @@ public:
 	int readedCANID() const;
 
 protected:
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+	bool openDevice() override;
+	bool closeDevice() override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
 
 private:
 	int sock;
diff --git a/libs/main/io_devices/piethernet.h b/libs/main/io_devices/piethernet.h
index 9cfe25f7..0cbed2eb 100644
--- a/libs/main/io_devices/piethernet.h
+++ b/libs/main/io_devices/piethernet.h
@@ -462,24 +462,24 @@ public:
 protected:
 	explicit PIEthernet(int sock, PIString ip_port);
 
-	virtual void propertyChanged(const char * name) override;
+	void propertyChanged(const char * name) override;
 	
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual bool configureDevice(const void * e_main, const void * e_parent = 0) override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override;
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	bool configureDevice(const void * e_main, const void * e_parent = 0) override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
+	DeviceInfoFlags deviceInfoFlags() const override;
 
 	//! Executes when any read function was successful. Default implementation does nothing
 	virtual void received(const void * data, int size) {;}
 
 	void construct();
-	virtual bool init() override;
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
+	bool init() override;
+	bool openDevice() override;
+	bool closeDevice() override;
 	void closeSocket(int & sd);
 	void applyTimeouts();
 	void applyTimeout(int fd, int opt, double ms);
diff --git a/libs/main/io_devices/pifile.h b/libs/main/io_devices/pifile.h
index 0ff74748..88e7a313 100644
--- a/libs/main/io_devices/pifile.h
+++ b/libs/main/io_devices/pifile.h
@@ -180,7 +180,7 @@ public:
 	
 	//! \~english Immediate write all buffered data to disk
 	//! \~russian Немедленно записывает все буферизированные данные на диск
-	virtual void flush() override;
+	void flush() override;
 	
 	//! \~english Move read/write position to "position"
 	//! \~russian Перемещает позицию чтения/записи на "position"
@@ -226,6 +226,8 @@ public:
 	//! \~english Returns file size in bytes
 	//! \~russian Возвращает размер файла в байтах
 	llong size() const;
+
+	ssize_t bytesAvailible() const override {return size() - pos();}
 	
 	//! \~english Returns read/write position
 	//! \~russian Возвращает позицию чтения/записи
@@ -324,15 +326,15 @@ public:
 //! \}
 
 protected:
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential | PIIODevice::Reliable;}
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
+	bool openDevice() override;
+	bool closeDevice() override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential | PIIODevice::Reliable;}
 
 private:
 	PIString strType(const PIIODevice::DeviceMode type);
diff --git a/libs/main/io_devices/pigpio.h b/libs/main/io_devices/pigpio.h
index cff041bb..26c6e2b3 100644
--- a/libs/main/io_devices/pigpio.h
+++ b/libs/main/io_devices/pigpio.h
@@ -112,9 +112,9 @@ private:
 	void exportGPIO(int gpio_num);
 	void openGPIO(GPIOData & g);
 	bool getPinState(int gpio_num);
-	void begin();
-	void run();
-	void end();
+	void begin() override;
+	void run() override;
+	void end() override;
 
 	static PIString GPIOName(int gpio_num);
 
diff --git a/libs/main/io_devices/piiobytearray.h b/libs/main/io_devices/piiobytearray.h
index 38abb64d..99be18ca 100644
--- a/libs/main/io_devices/piiobytearray.h
+++ b/libs/main/io_devices/piiobytearray.h
@@ -83,12 +83,17 @@ public:
 	//! \~english Insert data "ba" into content at current position
 	//! \~russian Вставляет данные "ba" в содержимое буфера в текущую позицию
 	int writeByteArray(const PIByteArray & ba);
+
+	ssize_t bytesAvailible() const override {
+		if (data_) return data_->size();
+		else return 0;
+	}
 	
 protected:
-	virtual bool openDevice() override;
-	virtual int readDevice(void * read_to, int size) override;
-	virtual int writeDevice(const void * data_, int size) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential | PIIODevice::Reliable;}
+	bool openDevice() override;
+	int readDevice(void * read_to, int size) override;
+	int writeDevice(const void * data_, int size) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential | PIIODevice::Reliable;}
 
 	ssize_t pos;
 	PIByteArray * data_;
diff --git a/libs/main/io_devices/piiodevice.cpp b/libs/main/io_devices/piiodevice.cpp
index 08dde643..daae327c 100644
--- a/libs/main/io_devices/piiodevice.cpp
+++ b/libs/main/io_devices/piiodevice.cpp
@@ -230,8 +230,7 @@ void PIIODevice::stop(bool hard) {
 PIByteArray PIIODevice::read(int max_size) {
 	buffer_in.resize(max_size);
 	int ret = readDevice(buffer_in.data(), max_size);
-	if (ret < 0)
-		return PIByteArray();
+	if (ret < 0) return PIByteArray();
 	return buffer_in.resized(ret);
 }
 
diff --git a/libs/main/io_devices/piiodevice.h b/libs/main/io_devices/piiodevice.h
index 604c2374..fa1063fb 100644
--- a/libs/main/io_devices/piiodevice.h
+++ b/libs/main/io_devices/piiodevice.h
@@ -66,7 +66,7 @@ typedef bool (*ReadRetFunc)(const uchar *, int, void *);
 		PIOBJECT_SUBCLASS(name, PIIODevice) \
 		PIIODevice * copy() const override {return new name();} \
 	public: \
-		virtual PIConstChars fullPathPrefix() const override {return prefix;} \
+		PIConstChars fullPathPrefix() const override {return prefix;} \
 		static PIConstChars fullPathPrefixS() {return prefix;} \
 	private:
 
@@ -284,6 +284,17 @@ public:
 	//! \~russian Читает из устройства не более "max_size" байт и возвращает данные как PIByteArray
 	PIByteArray read(int max_size);
 
+	//! \~english Returns the number of bytes that are available for reading.
+	//! \~russian Возвращает количество байт
+	//! \~\details
+	//! \~english This function is commonly used with sequential devices
+	//! to determine the number of bytes to allocate in a buffer before reading.
+	//! If function returns -1 it mean that number of bytes undefined.
+	//! \~russian Эта функция как правило используется чтобы знать какой
+	//! размер буфера нужен в памяти для чтения.
+	//! Если функция возвращает -1 это значит что количество байт для чтения не известно.
+	virtual ssize_t bytesAvailible() const {return -1;}
+
 	//! \~english Write maximum "max_size" bytes of "data" to device
 	//! \~russian Пишет в устройство не более "max_size" байт из "data"
 	int write(const void * data, int max_size) {return writeDevice(data, max_size);}
@@ -536,7 +547,7 @@ private:
 	EVENT_HANDLER2(void, check_start, void * , data, int, delim);
 	EVENT_HANDLER(void, write_func);
 
-	virtual PIIODevice * copy() const {return 0;}
+	virtual PIIODevice * copy() const {return nullptr;}
 	PIString fullPathOptions() const;
 	void _init();
 	void begin() override;
diff --git a/libs/main/io_devices/piiostream.h b/libs/main/io_devices/piiostream.h
index 6f038aba..42221bca 100644
--- a/libs/main/io_devices/piiostream.h
+++ b/libs/main/io_devices/piiostream.h
@@ -47,12 +47,17 @@ public:
 
 	bool binaryStreamAppendImp(const void * d, size_t s) {
 		if (!dev) return false;
-		return dev->write(d, s);
+		return (dev->write(d, s) == (int)s);
 	}
 
 	bool binaryStreamTakeImp(void * d, size_t s) {
 		if (!dev) return false;
-		return dev->read(d, s);
+		return (dev->read(d, s) == (int)s);
+	}
+
+	ssize_t binaryStreamSizeImp() const {
+		if (!dev) return 0;
+		return dev->bytesAvailible();
 	}
 
 private:
diff --git a/libs/main/io_devices/piiostring.cpp b/libs/main/io_devices/piiostring.cpp
index 78549b5b..19ee5c18 100644
--- a/libs/main/io_devices/piiostring.cpp
+++ b/libs/main/io_devices/piiostring.cpp
@@ -56,9 +56,9 @@ bool PIIOString::open(const PIString & string) {
 PIString PIIOString::readLine() {
 	if (!canRead() || !str) return PIString();
 	int np = pos;
-	while (++np < str->size_s())
-		if ((*str)[np] == '\n')
-			break;
+	while (++np < str->size_s()) {
+		if ((*str)[np] == '\n') break;
+	}
 	PIString ret = str->mid(pos, np - pos);
 	pos = piMini(np + 1, str->size_s());
 	return ret;
@@ -66,7 +66,7 @@ PIString PIIOString::readLine() {
 
 
 int PIIOString::readDevice(void * read_to, int max_size) {
-	if (!canRead() || !str) return -1;
+	if (!canRead() || !str || max_size <= 0) return -1;
 	PIString rs = str->mid(pos, max_size);
 	pos += max_size;
 	if (pos > str->size_s()) pos = str->size_s();
diff --git a/libs/main/io_devices/piiostring.h b/libs/main/io_devices/piiostring.h
index 098c6f2a..033ecfd3 100644
--- a/libs/main/io_devices/piiostring.h
+++ b/libs/main/io_devices/piiostring.h
@@ -88,11 +88,16 @@ public:
 	//! \~russian Вставляет строку "string" в содержимое буфера в текущую позицию
 	int writeString(const PIString & string);
 	
+	ssize_t bytesAvailible() const override {
+		if (str) return str->size() - pos;
+		else return 0;
+	}
+
 protected:
-	virtual bool openDevice() override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential | PIIODevice::Reliable;}
+	bool openDevice() override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential | PIIODevice::Reliable;}
 
 	ssize_t pos;
 	PIString * str;
diff --git a/libs/main/io_devices/pipeer.cpp b/libs/main/io_devices/pipeer.cpp
index e120c6e1..394b34b3 100644
--- a/libs/main/io_devices/pipeer.cpp
+++ b/libs/main/io_devices/pipeer.cpp
@@ -924,6 +924,15 @@ void PIPeer::changeName(const PIString &new_name) {
 }
 
 
+ssize_t PIPeer::bytesAvailible() const {
+	ssize_t ret = 0;
+	read_buffer_mutex.lock();
+	if (!read_buffer.isEmpty()) ret = read_buffer.back().size();
+	read_buffer_mutex.unlock();
+	return ret;
+}
+
+
 int PIPeer::readDevice(void *read_to, int max_size) {
 	read_buffer_mutex.lock();
 	bool empty = read_buffer.isEmpty();
diff --git a/libs/main/io_devices/pipeer.h b/libs/main/io_devices/pipeer.h
index fbd88558..9170ed7e 100644
--- a/libs/main/io_devices/pipeer.h
+++ b/libs/main/io_devices/pipeer.h
@@ -116,6 +116,8 @@ public:
 	void setTrustPeerName(const PIString & peer_name) {trust_peer = peer_name;}
 	void setTcpServerIP(const PIString & ip) {server_ip = ip; tcpClientReconnect();}
 
+	ssize_t bytesAvailible() const override;
+
 	
 	EVENT2(dataReceivedEvent, const PIString &, from, const PIByteArray &, data);
 	EVENT1(peerConnectedEvent, const PIString &, name);
@@ -164,15 +166,15 @@ private:
 	void addToRemoved(const PeerInfo & pi) {removed[pi.name] = PIPair<int, PISystemTime>(pi.cnt, pi.time);}
 	bool isRemoved(const PeerInfo & pi) const {return (removed.value(pi.name) == PIPair<int, PISystemTime>(pi.cnt, pi.time));}
 
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString &full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int size) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+	bool openDevice() override;
+	bool closeDevice() override;
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString &full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int size) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
 
 	PeerInfo * quickestPeer(const PIString & to);
 	bool sendToNeighbour(PeerInfo * peer, const PIByteArray & ba);
@@ -198,7 +200,7 @@ private:
 	bool destroyed, no_timer;
 	PIString trust_peer;
 	PIString server_ip;
-	PIMutex read_buffer_mutex;
+	mutable PIMutex read_buffer_mutex;
 	PIQueue<PIByteArray> read_buffer;
 	int read_buffer_size;
 	PIMutex mc_mutex, eth_mutex, peers_mutex, send_mutex, send_mc_mutex;
diff --git a/libs/main/io_devices/piserial.h b/libs/main/io_devices/piserial.h
index 96c12dac..192cd6ef 100644
--- a/libs/main/io_devices/piserial.h
+++ b/libs/main/io_devices/piserial.h
@@ -282,19 +282,19 @@ public:
 //! \}
 	
 protected:
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual bool configureDevice(const void * e_main, const void * e_parent = 0) override;
-	virtual void optionsChanged() override;
-	virtual void threadedReadBufferSizeChanged() override;
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	bool configureDevice(const void * e_main, const void * e_parent = 0) override;
+	void optionsChanged() override;
+	void threadedReadBufferSizeChanged() override;
 
 	//! \~english Basic read function
 	//! \~russian Базовое чтение
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential;}
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential;}
 
 	//! Executes when any read function was successful. Default implementation does nothing
 	virtual void received(const void * data, int size) {;}
@@ -306,8 +306,8 @@ protected:
 	bool setBit(int bit, bool on, const PIString & bname);
 	bool isBit(int bit, const PIString & bname) const;
 
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
+	bool openDevice() override;
+	bool closeDevice() override;
 
 	PRIVATE_DECLARATION(PIP_EXPORT)
 	int fd, vtime;
diff --git a/libs/main/io_devices/pisharedmemory.h b/libs/main/io_devices/pisharedmemory.h
index 3fe9db8b..112260c4 100644
--- a/libs/main/io_devices/pisharedmemory.h
+++ b/libs/main/io_devices/pisharedmemory.h
@@ -91,15 +91,15 @@ public:
 	
 
 protected:
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual int readDevice(void * read_to, int max_size) override {return read(read_to, max_size, 0);}
-	virtual int writeDevice(const void * data, int max_size) override {return write(data, max_size, 0);}
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+	bool openDevice() override;
+	bool closeDevice() override;
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	int readDevice(void * read_to, int max_size) override {return read(read_to, max_size, 0);}
+	int writeDevice(const void * data, int max_size) override {return write(data, max_size, 0);}
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
 
 private:
 	void initPrivate();
diff --git a/libs/main/io_devices/pispi.cpp b/libs/main/io_devices/pispi.cpp
index a9c74253..76f4b00d 100644
--- a/libs/main/io_devices/pispi.cpp
+++ b/libs/main/io_devices/pispi.cpp
@@ -88,6 +88,11 @@ bool PISPI::isParameterSet(PISPI::Parameters parameter) const {
 }
 
 
+ssize_t PISPI::bytesAvailible() const {
+	return recv_buf.size();
+}
+
+
 bool PISPI::openDevice() {
 #ifdef PIP_SPI
 	int ret = 0;
@@ -126,7 +131,7 @@ bool PISPI::closeDevice() {
 int PISPI::readDevice(void * read_to, int max_size) {
 	int sz = piMini(recv_buf.size_s(), max_size);
 	memcpy(read_to, recv_buf.data(), sz);
-	recv_buf.resize(recv_buf.size_s() - sz);
+	recv_buf.remove(0, sz);
 	return sz;
 }
 
diff --git a/libs/main/io_devices/pispi.h b/libs/main/io_devices/pispi.h
index ad50e8b2..d6aa69e5 100644
--- a/libs/main/io_devices/pispi.h
+++ b/libs/main/io_devices/pispi.h
@@ -60,18 +60,19 @@ public:
 	//! Returns parameters
 	PIFlags<PISPI::Parameters> parameters() const {return spi_mode;}
 
+	ssize_t bytesAvailible() const override;
 
 protected:
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
+	bool openDevice() override;
+	bool closeDevice() override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
 
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual PIPropertyStorage constructVariantDevice() const override;
-	virtual void configureFromVariantDevice(const PIPropertyStorage & d) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential;}
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	PIPropertyStorage constructVariantDevice() const override;
+	void configureFromVariantDevice(const PIPropertyStorage & d) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Sequential;}
 
 private:
 	uint spi_speed;
diff --git a/libs/main/io_devices/pitransparentdevice.cpp b/libs/main/io_devices/pitransparentdevice.cpp
index dc9cb353..2e9a42e1 100644
--- a/libs/main/io_devices/pitransparentdevice.cpp
+++ b/libs/main/io_devices/pitransparentdevice.cpp
@@ -49,6 +49,15 @@ PITransparentDevice::~PITransparentDevice() {
 }
 
 
+ssize_t PITransparentDevice::bytesAvailible() const {
+	ssize_t ret = 0;
+	que_mutex.lock();
+	if (que.isNotEmpty()) ret = que.back().size();
+	que_mutex.unlock();
+	return ret;
+}
+
+
 int PITransparentDevice::readDevice(void * read_to, int max_size) {
 	if (!canRead()) return -1;
 	que_mutex.lock();
diff --git a/libs/main/io_devices/pitransparentdevice.h b/libs/main/io_devices/pitransparentdevice.h
index b3080996..194f0975 100644
--- a/libs/main/io_devices/pitransparentdevice.h
+++ b/libs/main/io_devices/pitransparentdevice.h
@@ -44,14 +44,16 @@ public:
 	
 	virtual ~PITransparentDevice();
 	
-protected:
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+	ssize_t bytesAvailible() const override;
 
-	PIMutex que_mutex;
+protected:
+	bool openDevice() override;
+	bool closeDevice() override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
+	DeviceInfoFlags deviceInfoFlags() const override {return PIIODevice::Reliable;}
+
+	mutable PIMutex que_mutex;
 	PIQueue<PIByteArray> que;
 
 };
diff --git a/libs/main/io_devices/piusb.h b/libs/main/io_devices/piusb.h
index 3e7650c1..9e13218e 100644
--- a/libs/main/io_devices/piusb.h
+++ b/libs/main/io_devices/piusb.h
@@ -160,14 +160,14 @@ public:
 	virtual void flush() override;
 
 protected:
-	virtual bool configureDevice(const void * e_main, const void * e_parent = 0) override;
-	virtual PIString constructFullPathDevice() const override;
-	virtual void configureFromFullPathDevice(const PIString & full_path) override;
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size) override;
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual DeviceInfoFlags deviceInfoFlags() const {return PIIODevice::Reliable;}
+	bool configureDevice(const void * e_main, const void * e_parent = 0) override;
+	PIString constructFullPathDevice() const override;
+	void configureFromFullPathDevice(const PIString & full_path) override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size) override;
+	bool openDevice() override;
+	bool closeDevice() override;
+	DeviceInfoFlags deviceInfoFlags() const {return PIIODevice::Reliable;}
 
 	PIVector<PIUSB::Endpoint> eps;
 	ushort vid_, pid_;
diff --git a/libs/main/io_utils/pibroadcast.h b/libs/main/io_utils/pibroadcast.h
index 32777b8a..a6b99311 100644
--- a/libs/main/io_utils/pibroadcast.h
+++ b/libs/main/io_utils/pibroadcast.h
@@ -136,7 +136,7 @@ private:
 	EVENT_HANDLER2(void, mcastRead, const uchar * , data, int, size);
 	void destroyAll();
 	void initAll(PIVector<PIEthernet::Address> al);
-	void run();
+	void run() override;
 
 	Channels _channels;
 	PIEthernet::Address mcast_address;
diff --git a/libs/main/io_utils/piconnection.h b/libs/main/io_utils/piconnection.h
index f176be21..b42a6d5e 100644
--- a/libs/main/io_utils/piconnection.h
+++ b/libs/main/io_utils/piconnection.h
@@ -308,7 +308,7 @@ public:
 			PIVector<PIConnection * > listeners;
 		};
 		
-		void run();
+		void run() override;
 		
 		void deviceReaded(DeviceData * dd, const PIByteArray & data);
 		
@@ -372,7 +372,7 @@ private:
 		PIVector<PIIODevice * > devices;
 		PIByteArray sdata;
 		float int_;
-		void tick(void * , int);
+		void tick(void * , int) override;
 	};
 	
 	PIMap<PIString, Extractor * > extractors;
diff --git a/libs/main/io_utils/pidiagnostics.h b/libs/main/io_utils/pidiagnostics.h
index d014b26c..6fc30f32 100644
--- a/libs/main/io_utils/pidiagnostics.h
+++ b/libs/main/io_utils/pidiagnostics.h
@@ -138,9 +138,9 @@ private:
 	friend bool operator !=(const PIDiagnostics::Entry & f, const PIDiagnostics::Entry & s);
 	friend bool operator <(const PIDiagnostics::Entry & f, const PIDiagnostics::Entry & s);
 
-	void tick(void *, int);
+	void tick(void *, int) override;
 	Entry calcHistory(PIQueue<Entry> & hist, int & cnt);
-	void propertyChanged(const char *);
+	void propertyChanged(const char *) override;
 	void changeDisconnectTimeout(float disct);
 
 	PIQueue<Entry> history_rec, history_send;
diff --git a/libs/main/io_utils/pipacketextractor.cpp b/libs/main/io_utils/pipacketextractor.cpp
index ac43501a..ee015af4 100644
--- a/libs/main/io_utils/pipacketextractor.cpp
+++ b/libs/main/io_utils/pipacketextractor.cpp
@@ -137,6 +137,12 @@ void PIPacketExtractor::setDevice(PIIODevice * device_) {
 }
 
 
+ssize_t PIPacketExtractor::bytesAvailible() const {
+	if (dev) return dev->bytesAvailible();
+	else return 0;
+}
+
+
 void PIPacketExtractor::setBufferSize(int new_size) {
 	buffer_size = new_size;
 	buffer.resize(buffer_size);
diff --git a/libs/main/io_utils/pipacketextractor.h b/libs/main/io_utils/pipacketextractor.h
index 6c5cfa34..9f64009d 100644
--- a/libs/main/io_utils/pipacketextractor.h
+++ b/libs/main/io_utils/pipacketextractor.h
@@ -62,6 +62,7 @@ public:
 	//! Set child %device to "device_"
 	void setDevice(PIIODevice * device_);
 
+	ssize_t bytesAvailible() const override;
 
 	//! Returns buffer size
 	int bufferSize() const {return buffer_size;}
@@ -164,14 +165,14 @@ protected:
 
 private:
 	void construct();
-	void propertyChanged(const char *);
-	virtual int readDevice(void * read_to, int max_size) override;
-	virtual int writeDevice(const void * data, int max_size)  override;
-	virtual bool threadedRead(const uchar * readed, int size) override;
-	virtual PIString constructFullPathDevice() const override;
-	virtual bool openDevice() override;
-	virtual bool closeDevice() override;
-	virtual DeviceInfoFlags deviceInfoFlags() const override;
+	void propertyChanged(const char *) override;
+	int readDevice(void * read_to, int max_size) override;
+	int writeDevice(const void * data, int max_size)  override;
+	bool threadedRead(const uchar * readed, int size) override;
+	PIString constructFullPathDevice() const override;
+	bool openDevice() override;
+	bool closeDevice() override;
+	DeviceInfoFlags deviceInfoFlags() const override;
 
 	PIIODevice * dev;
 	PIByteArray buffer, tmpbuf, src_header, src_footer, trbuf;
diff --git a/libs/main/system/piprocess.h b/libs/main/system/piprocess.h
index 9451d0be..d19d367e 100644
--- a/libs/main/system/piprocess.h
+++ b/libs/main/system/piprocess.h
@@ -207,7 +207,7 @@ public:
 //! \}
 
 private:
-	virtual void run();
+	void run() override;
 	void exec_();
 	void startProc(bool detached);
 
diff --git a/libs/main/system/pisingleapplication.h b/libs/main/system/pisingleapplication.h
index 86fbfae4..b4994b50 100644
--- a/libs/main/system/pisingleapplication.h
+++ b/libs/main/system/pisingleapplication.h
@@ -72,8 +72,8 @@ public:
 //! \}
 
 private:
-	void begin();
-	void run();
+	void begin() override;
+	void run() override;
 	void waitFirst() const;
 
 	PISharedMemory * shm;
diff --git a/libs/main/system/pisystemmonitor.h b/libs/main/system/pisystemmonitor.h
index f9812f99..4a323616 100644
--- a/libs/main/system/pisystemmonitor.h
+++ b/libs/main/system/pisystemmonitor.h
@@ -247,7 +247,7 @@ public:
 
 
 private:
-	void run();
+	void run() override;
 	void gatherThread(llong id);
 	float calcThreadUsage(PISystemTime & t_new, PISystemTime & t_old);
 
diff --git a/libs/main/thread/pigrabberbase.h b/libs/main/thread/pigrabberbase.h
index 4592e179..8d6b0860 100644
--- a/libs/main/thread/pigrabberbase.h
+++ b/libs/main/thread/pigrabberbase.h
@@ -147,10 +147,10 @@ protected:
 	mutable PIMutex rec_mutex;
 
 private:
-	void begin() {
+	void begin() override {
 		init();
 	}
-	void run() {
+	void run() override {
 		if (!isOpened()) {
 			open();
 			diag_.reset();
@@ -185,7 +185,7 @@ private:
 		}
 	}
 
-	void end() {
+	void end() override {
 		stopRecord();
 		close();
 	}
diff --git a/libs/main/thread/pipipelinethread.h b/libs/main/thread/pipipelinethread.h
index 63fbd847..4f7681df 100644
--- a/libs/main/thread/pipipelinethread.h
+++ b/libs/main/thread/pipipelinethread.h
@@ -135,8 +135,8 @@ protected:
 	uint max_size;
 
 private:
-	void begin() {cnt = 0;}
-	void run() {
+	void begin() override {cnt = 0;}
+	void run() override {
 		mutex.lock();
 		while (in.isEmpty()) {
 			cv.wait(mutex);
diff --git a/libs/main/thread/pitimer.cpp b/libs/main/thread/pitimer.cpp
index 2e3a925f..f629bb1e 100644
--- a/libs/main/thread/pitimer.cpp
+++ b/libs/main/thread/pitimer.cpp
@@ -220,7 +220,7 @@ private:
 		static Pool * instance();
 		void add(_PITimerImp_Pool * t);
 		void remove(_PITimerImp_Pool * t);
-		void run();
+		void run() override;
 		PIVector<_PITimerImp_Pool * > timers, to_remove;
 	private:
 		explicit Pool();
diff --git a/utils/system_daemon/daemon.h b/utils/system_daemon/daemon.h
index e469900c..eed782f1 100644
--- a/utils/system_daemon/daemon.h
+++ b/utils/system_daemon/daemon.h
@@ -114,7 +114,7 @@ private:
 		EVENT_HANDLER(void, termTimerTick);
 		
 		void startAction(PacketType a, const PIString & dir, const PIStringList & fl);
-		void run();
+		void run() override;
 		
 		PIDir dir_my;
 		PIVector<PIFile::FileInfo> my_filelist;
@@ -140,9 +140,9 @@ private:
 		TileButtons * buttons;
 		PIFileTransfer * ft;
 		PITimeMeasurer tm, tme;
-		void resizeEvent(int w, int h);
-		void sizeHint(int & w, int & h) const;
-		void drawEvent(PIScreenDrawer * d);
+		void resizeEvent(int w, int h) override;
+		void sizeHint(int & w, int & h) const override;
+		void drawEvent(PIScreenDrawer * d) override;
 		bool rec;
 		PIString conn_name;
 		EVENT_HANDLER2(void, tileEvent, PIScreenTile *, t, PIScreenTypes::TileEvent, e);
diff --git a/utils/system_daemon/file_manager.h b/utils/system_daemon/file_manager.h
index a4c6d495..6f3fd54f 100644
--- a/utils/system_daemon/file_manager.h
+++ b/utils/system_daemon/file_manager.h
@@ -43,9 +43,9 @@ private:
 		TileDir();
 		void updateDir();
 		void buildNames();
-		bool keyEvent(PIKbdListener::KeyEvent key);
-		void sizeHint(int & w, int & h) const;
-		void resizeEvent(int w, int h);
+		bool keyEvent(PIKbdListener::KeyEvent key) override;
+		void sizeHint(int & w, int & h) const override;
+		void resizeEvent(int w, int h) override;
 		void lock();
 		void unlock();
 		void showReading();
diff --git a/utils/system_daemon/main.cpp b/utils/system_daemon/main.cpp
index ba1f2ba8..ef8dfe04 100755
--- a/utils/system_daemon/main.cpp
+++ b/utils/system_daemon/main.cpp
@@ -232,7 +232,7 @@ public:
 		}
 		screen->unlock();
 	}
-	void tick(void* data_, int delimiter) {
+	void tick(void* data_, int delimiter) override {
 		if (tpeerdiag->visible || tpeer->visible)
 			updatePeerInfo();
 		if (tinfo->visible)
diff --git a/utils/system_daemon/terminal_tile.h b/utils/system_daemon/terminal_tile.h
index 0d97c497..65e348bc 100644
--- a/utils/system_daemon/terminal_tile.h
+++ b/utils/system_daemon/terminal_tile.h
@@ -17,9 +17,9 @@ public:
 	EVENT(closeRequest)
 
 private:
-	void drawEvent(PIScreenDrawer * d);
-	bool keyEvent(PIKbdListener::KeyEvent key);
-	void resizeEvent(int w, int h);
+	void drawEvent(PIScreenDrawer * d) override;
+	bool keyEvent(PIKbdListener::KeyEvent key) override;
+	void resizeEvent(int w, int h) override;
 
 	PIVector<PIVector<PIScreenTypes::Cell> > cells;
 	char lastp[3];
diff --git a/utils/udp_file_transfer/main.cpp b/utils/udp_file_transfer/main.cpp
index f06eecec..f048cafa 100644
--- a/utils/udp_file_transfer/main.cpp
+++ b/utils/udp_file_transfer/main.cpp
@@ -75,7 +75,7 @@ private:
 	PIEthernet eth;
 	bool quet_;
 
-	void tick(void *, int) {
+	void tick(void *, int) override {
 		if (ft.isStarted()) {
 			ftevent();
 			updatePMT();