diff --git a/src/io/piconfig.cpp b/src/io/piconfig.cpp
index 5aa64160..1e749c94 100755
--- a/src/io/piconfig.cpp
+++ b/src/io/piconfig.cpp
@@ -706,7 +706,7 @@ void PIConfig::parse() {
 	if (!isOpened()) return;
 	_seekToBeginDev();
 	other.clear();
-	lines = centry = 0;
+	lines = 0;
 	while (!_isEndDev()) {
 		other.push_back(PIString());
 		src = str = parseLine(_readLineDev());
diff --git a/src/io/piconfig.h b/src/io/piconfig.h
index 30e3daab..84f70b80 100755
--- a/src/io/piconfig.h
+++ b/src/io/piconfig.h
@@ -487,7 +487,6 @@ private:
 	PIString parseLine(PIString v);
 	void parse();
 	
-	int centry;
 	bool own_dev, internal;
 	PIVector<PIConfig * > includes, inc_devs;
 	Branch all_includes;
diff --git a/src/io/piconnection.cpp b/src/io/piconnection.cpp
index b65261a0..5cc23bde 100755
--- a/src/io/piconnection.cpp
+++ b/src/io/piconnection.cpp
@@ -790,6 +790,12 @@ void PIConnection::stopAllSenders() {
 }
 
 
+void PIConnection::destroy() {
+	stop();
+	removeAllDevices();
+}
+
+
 PIDiagnostics * PIConnection::diagnostic(const PIString & full_path_name) const {
 	PIIODevice * dev = deviceByFullPath(full_path_name);
 	if (dev == 0) dev = device_names.value(full_path_name, 0);
@@ -1010,6 +1016,7 @@ PIConnection::DevicePool::DeviceData::~DeviceData() {
 		rthread = 0;
 	}
 	if (dev != 0) {
+		dev->close();
 		delete dev;
 		dev = 0;
 	}
diff --git a/src/io/piconnection.h b/src/io/piconnection.h
index d2c2e2d3..6606cc0d 100755
--- a/src/io/piconnection.h
+++ b/src/io/piconnection.h
@@ -240,6 +240,7 @@ public:
 	//! Stop all read threads and senders
 	void stop() {stopAllThreadedReads(); stopAllSenders();}
 	
+	void destroy();
 	
 	//! Returns if there are no devices in this connection
 	bool isEmpty() const {return device_modes.isEmpty();}
diff --git a/src/io/piethernet.cpp b/src/io/piethernet.cpp
index 3b69256c..2d288f83 100755
--- a/src/io/piethernet.cpp
+++ b/src/io/piethernet.cpp
@@ -134,9 +134,9 @@ PIEthernet::PIEthernet(int sock_, PIString ip_port): PIIODevice("", ReadWrite) {
 
 PIEthernet::~PIEthernet() {
 	//piCoutObj << "~PIEthernet ...";
-	piMonitor.ethernets--;
 	stop();
 	closeDevice();
+	piMonitor.ethernets--;
 	//piCoutObj << "~PIEthernet done";
 }
 
diff --git a/src/io/piethernet.h b/src/io/piethernet.h
index 0f4392ff..0f2fbee4 100755
--- a/src/io/piethernet.h
+++ b/src/io/piethernet.h
@@ -399,10 +399,10 @@ protected:
 	void applyOptInt(int level, int opt, int val);
 	
 	PRIVATE_DECLARATION
-	int sock, sock_s, wrote;
-	mutable int port_, port_s, port_c, port_r;
+	int sock, sock_s;
+	mutable int port_, port_s, port_r;
 	bool connected_, connecting_, listen_threaded, server_bounded;
-	mutable PIString ip_, ip_s, ip_c, ip_r;
+	mutable PIString ip_, ip_s, ip_r;
 	PIThread server_thread_;
 	PIMutex clients_mutex;
 	PIVector<PIEthernet * > clients_;
diff --git a/src/io/pifile.h b/src/io/pifile.h
index a3125ca6..5a414d61 100755
--- a/src/io/pifile.h
+++ b/src/io/pifile.h
@@ -88,7 +88,7 @@ public:
 	
 	PIFile(const PIFile & other);
 	
-	~PIFile() {close();}
+	~PIFile() {closeDevice();}
 	
 	//PIFile & operator =(const PIFile & f) {path_ = f.path_; type_ = f.type_; return *this;}
 	
diff --git a/src/io/pifiletransfer.cpp b/src/io/pifiletransfer.cpp
index 5decdd1e..1803bc2a 100644
--- a/src/io/pifiletransfer.cpp
+++ b/src/io/pifiletransfer.cpp
@@ -49,15 +49,15 @@ bool PIFileTransfer::send(PIVector<PIFile::FileInfo> entries) {
 		allEntries.back().dest_path = entries[i].name();
 		if (entries[i].isDir()) {
 			cur_file_string = "scanning ... ";
-			d.setDir(entries[i].path);
+			scan_dir.setDir(entries[i].path);
 			scanning = true;
-			PIVector<PIFile::FileInfo> fls = d.allEntries();
+			PIVector<PIFile::FileInfo> fls = scan_dir.allEntries();
 			scanning = false;
-			d.up();
+			scan_dir.up();
 			//piCout << "files rel to" << d.absolutePath();
 			for (int j = 0; j < fls.size(); j++) {
 				allEntries << PFTFileInfo(fls[j]);
-				allEntries.back().dest_path = d.relative(fls[j].path);
+				allEntries.back().dest_path = scan_dir.relative(fls[j].path);
 				//piCout << "  abs path" << fls[j].path;
 				//piCout << "  rel path" << allEntries.back().dest_path;
 			}
@@ -249,7 +249,7 @@ void PIFileTransfer::receivePart(PIBaseTransfer::Part fi, PIByteArray ba, PIByte
 
 PIString PIFileTransfer::curFile() const {
 	if (scanning)
-		return cur_file_string + d.scanDir();
+		return cur_file_string + scan_dir.scanDir();
 	return cur_file_string;
 }
 
diff --git a/src/io/pifiletransfer.h b/src/io/pifiletransfer.h
index f2429588..d2c5e26d 100644
--- a/src/io/pifiletransfer.h
+++ b/src/io/pifiletransfer.h
@@ -93,7 +93,7 @@ private:
 	PIDir dir;
 	PIFile work_file;
 	PIByteArray desc;
-	PIDir d;
+	PIDir scan_dir;
 	bool started_, scanning;
 
 	bool sendFiles(const PIVector<PFTFileInfo> &files);
diff --git a/src/io/piiostring.cpp b/src/io/piiostring.cpp
index daf994a8..1c13b37b 100644
--- a/src/io/piiostring.cpp
+++ b/src/io/piiostring.cpp
@@ -40,10 +40,6 @@ PIIOString::PIIOString(const PIString & string) {
 }
 
 
-PIIOString::~PIIOString() {
-}
-
-
 bool PIIOString::open(PIString * string, PIIODevice::DeviceMode mode_) {
 	str = string;
 	return PIIODevice::open(mode_);
diff --git a/src/io/piiostring.h b/src/io/piiostring.h
index 7110721a..7181d595 100644
--- a/src/io/piiostring.h
+++ b/src/io/piiostring.h
@@ -37,8 +37,7 @@ public:
 	//! Contructs %PIIOString with \"string\" content only for read
 	PIIOString(const PIString & string);
 	
-	~PIIOString();
-	
+	~PIIOString() {closeDevice();}
 	
 	//! Returns content
 	PIString * string() const {return str;}
diff --git a/src/io/pipacketextractor.cpp b/src/io/pipacketextractor.cpp
index e4af3329..ae75ff3d 100755
--- a/src/io/pipacketextractor.cpp
+++ b/src/io/pipacketextractor.cpp
@@ -99,7 +99,7 @@ void PIPacketExtractor::construct() {
 	setDevice(0);
 	setPacketSize(0);
 	setSplitMode(None);
-	allReaded = addSize = curInd = missed = missed_packets = footerInd = 0;
+	missed = missed_packets = footerInd = 0;
 	header_found = false;
 }
 
diff --git a/src/io/pipacketextractor.h b/src/io/pipacketextractor.h
index 7f599672..306161a8 100755
--- a/src/io/pipacketextractor.h
+++ b/src/io/pipacketextractor.h
@@ -118,11 +118,6 @@ public:
 	
 	// //! Returns pointer to \a missedPackets() count. Useful for output to PIConsole
 	const ullong * missedPackets_ptr() const {return &missed_packets;}
-
-	
-	// //! Returns last successfully validated header as byte array
-	PIByteArray lastHeader() {return mheader;}
-
 	
 	//! Directly call \a read() function of child %device
 	int read(void * read_to, int max_size) {if (dev == 0) return -1; return dev->read(read_to, max_size);}
@@ -172,11 +167,11 @@ private:
 	bool openDevice() {if (dev == 0) return false; return dev->open();}
 
 	PIIODevice * dev;
-	PIByteArray mheader, buffer, sbuffer, tmpbuf, src_header, src_footer, trbuf;
+	PIByteArray buffer, sbuffer, tmpbuf, src_header, src_footer, trbuf;
 	PacketExtractorCheckFunc ret_func_header, ret_func_footer;
 	SplitMode mode_;
 	void * data;
-	int buffer_size, dataSize, packetSize_hf, allReaded, addSize, curInd, footerInd, packetSize_;
+	int buffer_size, dataSize, packetSize_hf, footerInd, packetSize_;
 	double time_;
 	bool header_found;
 	ullong missed, missed_packets;
diff --git a/src/io/pipeer.cpp b/src/io/pipeer.cpp
index b7605bff..49e9b313 100755
--- a/src/io/pipeer.cpp
+++ b/src/io/pipeer.cpp
@@ -143,13 +143,13 @@ PIPeer::PIPeer(const PIString & n): PIIODevice() {
 	//joinMulticastGroup("239.240.241.242");
 	srand(uint(PISystemTime::current(true).toMicroseconds()));
 	//id_ = self_info.name + "_" + PIString::fromNumber(rand());
-	CONNECTU(&timer, tickEvent, this, timerEvent);
+	CONNECTU(&sync_timer, tickEvent, this, timerEvent);
 	prev_ifaces = PIEthernet::interfaces();
 	no_timer = false;
 //	initNetwork();
 	sendSelfInfo();
-	timer.addDelimiter(5);
-	timer.start(1000);
+	sync_timer.addDelimiter(5);
+	sync_timer.start(1000);
 }
 
 
@@ -162,7 +162,7 @@ PIPeer::~PIPeer() {
 			p._data->dt_out.stop();
 			p._data->t.stop(true);
 		}
-	timer.stop();
+	sync_timer.stop();
 	diag_s.stop();
 	diag_d.stop();
 	destroyEths();
diff --git a/src/io/pipeer.h b/src/io/pipeer.h
index 725ef5d5..e9b5ed83 100755
--- a/src/io/pipeer.h
+++ b/src/io/pipeer.h
@@ -92,7 +92,6 @@ public:
 		void init();
 		void destroy();
 		
-		PIString nearest_address;
 		int sync, cnt, trace;
 		bool was_update;
 		PISystemTime time;
@@ -200,7 +199,7 @@ private:
 	PIVector<PIEthernet * > eths_traffic, eths_mcast, eths_bcast;
 	PIEthernet::InterfaceList prev_ifaces;
 	PIEthernet eth_send, eth_lo;
-	PITimer timer;
+	PITimer sync_timer;
 	PeerInfo self_info;
 	PIVector<PeerInfo> peers;
 	PIMap<PIString, PeerInfo * > peers_map;
@@ -208,7 +207,6 @@ private:
 	PIMap<PIString, PIPair<int, PISystemTime> > removed;
 	PIDiagnostics diag_s, diag_d;
 	bool destroyed, no_timer;
-	PIString id_;
 	PIString trust_peer;
 	PIMutex read_buffer_mutex;
 	PIQueue<PIByteArray> read_buffer;
diff --git a/src/io/piprotocol.h b/src/io/piprotocol.h
index 138fc672..1ddab2bd 100755
--- a/src/io/piprotocol.h
+++ b/src/io/piprotocol.h
@@ -176,7 +176,7 @@ public:
 	void * sendData() {return sendDataPtr;}
 
 	PIPacketExtractor * packetExtractor() {return packet_ext;}
-	PIByteArray lastHeader() {return packet_ext->lastHeader();}
+//	PIByteArray lastHeader() {return packet_ext->lastHeader();}
 
 	EVENT0(receiverStarted)
 	EVENT0(receiverStopped)
diff --git a/src/io/piserial.cpp b/src/io/piserial.cpp
index 172006c5..7c9675d9 100755
--- a/src/io/piserial.cpp
+++ b/src/io/piserial.cpp
@@ -153,6 +153,7 @@ PISerial::PISerial(const PIString & device_, PISerial::Speed speed_, PIFlags<PIS
 
 
 PISerial::~PISerial() {
+	closeDevice();
 	piMonitor.serials--;
 }
 
@@ -523,8 +524,8 @@ void PISerial::applySettings() {
 	times.ReadIntervalTimeout = block_read ? vtime : MAXDWORD;
 	times.ReadTotalTimeoutConstant = block_read ? 0 : 1;
 	times.ReadTotalTimeoutMultiplier = block_read ? 0 : MAXDWORD;
-	times.WriteTotalTimeoutConstant = 0;
-	times.WriteTotalTimeoutMultiplier = block_write ? 0 : 1;
+	times.WriteTotalTimeoutConstant = 10;
+	times.WriteTotalTimeoutMultiplier = 1;// block_write ? 0 : 1;
 	if (SetCommTimeouts(PRIVATE->hCom, &times) == -1)
 		piCoutObj << "Unable to set timeouts for \"" << path() << "\"";
 	GetCommMask(PRIVATE->hCom, &PRIVATE->mask);
@@ -591,8 +592,8 @@ void PISerial::setReadIsBlocking(bool yes) {
 	times.ReadIntervalTimeout = block_read ? vtime : MAXDWORD;
 	times.ReadTotalTimeoutConstant = block_read ? 0 : 1;
 	times.ReadTotalTimeoutMultiplier = block_read ? 0 : MAXDWORD;
-	times.WriteTotalTimeoutConstant = 0;
-	times.WriteTotalTimeoutMultiplier = block_write ? 0 : 1;
+	times.WriteTotalTimeoutConstant = 10;
+	times.WriteTotalTimeoutMultiplier = 1;//block_write ? 0 : 1;
 	if (isOpened()) SetCommTimeouts(PRIVATE->hCom, &times);
 #else
 	if (isOpened()) fcntl(fd, F_SETFL, yes ? 0 : O_NONBLOCK);
@@ -619,7 +620,7 @@ int PISerial::read(void * read_to, int max_size) {
 
 
 int PISerial::write(const void * data, int max_size, bool wait) {
-//	piCoutObj << "send " << max_size;// << ": " << PIString((char*)data, max_size);
+	piCoutObj << "send " << max_size;// << ": " << PIString((char*)data, max_size);
 	if (fd == -1 || !canWrite()) {
 		//piCoutObj << "Can`t write to uninitialized COM";
 		return -1;
@@ -636,9 +637,9 @@ int PISerial::write(const void * data, int max_size, bool wait) {
 	wrote = ::write(fd, data, max_size);
 	if (wait) tcdrain(fd);
 #endif
+	piCoutObj << "Wrote " << wrote << " bytes in " << path();
 	return (int)wrote;
 	//piCoutObj << "Error while sending";
-	//piCoutObj << "Wrote " << wrote << " bytes in " << path_;
 }
 
 
diff --git a/src/io/piusb.cpp b/src/io/piusb.cpp
index f80d4987..0caf8941 100755
--- a/src/io/piusb.cpp
+++ b/src/io/piusb.cpp
@@ -17,6 +17,7 @@ PIUSB::PIUSB(ushort vid, ushort pid): PIIODevice("", ReadWrite) {
 	pid_ = pid;
 	intefrace_ = 0;
 	hdev = 0;
+	timeout_r = timeout_w = 0;
 	interface_claimed = -1;
 	setPath(PIString::fromNumber(vid_, 16).expandLeftTo(4, "0") + ":" + PIString::fromNumber(pid_, 16).expandLeftTo(4, "0"));
 	setDeviceNumber(1);
diff --git a/src/io/piusb.h b/src/io/piusb.h
index 4e7095be..e9dc5f93 100755
--- a/src/io/piusb.h
+++ b/src/io/piusb.h
@@ -32,6 +32,7 @@ class PIP_EXPORT PIUSB: public PIIODevice
 	PIIODEVICE(PIUSB)
 public:
 	PIUSB(ushort vid = 0, ushort pid = 0);
+	~PIUSB() {closeDevice();}
 	
 	struct Endpoint {
 		Endpoint(uchar a = 0, uchar at = 0, ushort mps = 0) {address = a; attributes = at; max_packet_size = mps; parse();}