diff --git a/cd_utils/cdutils_core.cpp b/cd_utils/cdutils_core.cpp
index 938247b..0abcb74 100644
--- a/cd_utils/cdutils_core.cpp
+++ b/cd_utils/cdutils_core.cpp
@@ -68,6 +68,7 @@ CDCore::CDCore() {
 	CONNECTU(&datatr, sendRequest, this, dtSendRequest)
 	CONNECTU(&datatr, receiveFinished, this, dtReceiveFinished)
 	CONNECTU(&sendt, started, this, sendThread)
+	CONNECTU(&x_timer, tickEvent, this, xTimerTick)
 
 	/*k_[1] = KType(1, "123", "120+3", "comment");
 	k_[2] = KType(2, "1", "2", "comm");
@@ -77,22 +78,16 @@ CDCore::CDCore() {
 	k_.section(11)[3] = KType(3, "1", "1", "88");
 	k_.section(11)[4] = KType(4, "0", "0", "88");
 	k_.section(11)[6] = KType(6, "0", "0", "88");*/
-	//piCout << s;
+			//piCout << s;
 }
 
 
-void CDCore::k_rec(const PIByteArray & data) {
-
-}
-
-
-void CDCore::x_rec(const PIByteArray & data) {
-
-}
-
-
-void CDCore::c_rec(const PIByteArray & data) {
-
+CDCore::~CDCore() {
+	datatr.stop();
+	x_timer.stop();
+	sendt.stop();
+	sendt.waitForFinish(10);
+	connection.stop();
 }
 
 
@@ -142,11 +137,29 @@ void CDCore::reinitConnection(const PIString &configuration) {
 }
 
 
+void CDCore::startPing() {
+	x_timer.start(1);
+}
+
+
 void CDUtils::CDCore::dataReceived(const PIString & from, const PIByteArray & data) {
 //	piCoutObj << "dataReceived" << from << data.size();
 	PIIODevice * d = connection.deviceByName("cd");
 	if (d && d == connection.deviceByFullPath(from)) {
-		datatr.received(data);
+		if (data.size() >= sizeof(4)) {
+			const uint sig = *((const uint*)(data.data()));
+			if (sig == 0x54424950) datatr.received(data);
+			else {
+				CDPacketType pt = (CDPacketType)sig;
+				switch(pt) {
+					case CD_Ping:
+						piCoutObj << "ping";
+						break;
+					default: break;
+				}
+			}
+		}
+
 	}
 }
 
@@ -209,6 +222,15 @@ void CDCore::sendThread() {
 }
 
 
+void CDCore::xTimerTick() {
+	PacketHeader ph;
+	ph.type = CD_Ping;
+	PIByteArray ba;
+	ba << ph;
+	connection.writeByName("cd", ba);
+}
+
+
 void CDCore::dtSendRequest(PIByteArray &data) {
 	connection.writeByName("cd", data);
 //	piCoutObj << "send" << data.size() << ret;
diff --git a/cd_utils/cdutils_core.h b/cd_utils/cdutils_core.h
index a08c49a..07f89fd 100644
--- a/cd_utils/cdutils_core.h
+++ b/cd_utils/cdutils_core.h
@@ -45,17 +45,17 @@ public:
 	PIString pultConfig() {return PIString(pult_config);}
 	PIString appConfig() {return PIString(app_config);}
 	void reinitConnection(const PIString & configuration);
+	void startPing();
 	bool inProgress() {return sendt.isRunning();}
 
 private:
 	CDCore();
+	~CDCore();
 	EVENT_HANDLER2(void, dataReceived, const PIString &, from, const PIByteArray &, data);
 	EVENT_HANDLER1(void, dtSendRequest, PIByteArray &, data);
 	EVENT_HANDLER1(void, dtReceiveFinished, bool, ok);
 	EVENT_HANDLER(void, sendThread);
-	void k_rec(const PIByteArray & data);
-	void x_rec(const PIByteArray & data);
-	void c_rec(const PIByteArray & data);
+	EVENT_HANDLER(void, xTimerTick);
 
 	static const char app_config[], pult_config[];
 	PIConnection connection;
@@ -63,6 +63,7 @@ private:
 	PacketHeader wheader;
 	PIByteArray send_data;
 	PIThread sendt;
+	PITimer x_timer;
 
 };
 
diff --git a/cd_utils/cdutils_k.cpp b/cd_utils/cdutils_k.cpp
index 987129e..1c5d07f 100644
--- a/cd_utils/cdutils_k.cpp
+++ b/cd_utils/cdutils_k.cpp
@@ -93,6 +93,11 @@ void KInterface::reinitConnection(const PIString &configuration) {
 }
 
 
+void KInterface::startPing() {
+	core->startPing();
+}
+
+
 void KInterface::write(PIIODevice * d) {
 	core->k_write(d);
 }
diff --git a/cd_utils/cdutils_k.h b/cd_utils/cdutils_k.h
index 74b9212..54de25a 100644
--- a/cd_utils/cdutils_k.h
+++ b/cd_utils/cdutils_k.h
@@ -39,6 +39,7 @@ public:
 	void setFileName(const PIString & file) {k_file = file;}
 	bool configure(const PIString & config, const PIString & sect = PIStringAscii("k"));
 	void reinitConnection(const PIString & configuration);
+	void startPing();
 	void write(PIIODevice * d);
 	void read(PIIODevice * d);
 	void parse(PIIODevice * d);
diff --git a/cd_utils/cdutils_protocol.h b/cd_utils/cdutils_protocol.h
index a99de68..4c674bf 100644
--- a/cd_utils/cdutils_protocol.h
+++ b/cd_utils/cdutils_protocol.h
@@ -9,15 +9,15 @@ enum CDPacketType {CD_Ping, CD_Pong, CD_KQuery, CD_KSend, CD_Command, CD_XData,
 
 # pragma pack(push,1)
 	struct PacketHeader {
-		int session_id;
 		int type; // CDPacketType
+		int session_id;
 	};
 
 # pragma pack(pop)
 
 
-	inline PIByteArray & operator <<(PIByteArray & s, const PacketHeader & v) {s << v.session_id << v.type; return s;}
-	inline PIByteArray & operator >>(PIByteArray & s, PacketHeader & v) {s >> v.session_id >> v.type; return s;}
+inline PIByteArray & operator <<(PIByteArray & s, const PacketHeader & v) {s << v.type << v.session_id; return s;}
+inline PIByteArray & operator >>(PIByteArray & s, PacketHeader & v) {s >> v.type >> v.session_id; return s;}
 
 }
 
diff --git a/cd_utils/pult/cdkview.cpp b/cd_utils/pult/cdkview.cpp
index 5e7e48c..7b7a6f3 100644
--- a/cd_utils/pult/cdkview.cpp
+++ b/cd_utils/pult/cdkview.cpp
@@ -44,6 +44,11 @@ void CDKView::setKFile(const QString &filename) {
 }
 
 
+void CDKView::startPing() {
+	K.startPing();
+}
+
+
 void CDKView::sendK() {
 	bisyStatusChanged(true);
 	K.send();
diff --git a/cd_utils/pult/cdkview.h b/cd_utils/pult/cdkview.h
index 836bba0..8405102 100644
--- a/cd_utils/pult/cdkview.h
+++ b/cd_utils/pult/cdkview.h
@@ -15,6 +15,7 @@ public:
 	~CDKView();
 	void refresh();
 	void setKFile(const QString & filename);
+	void startPing();
 
 	CDKItemModel * CDKModel() {return kmodel;}
 
diff --git a/cd_utils/pult/form.cpp b/cd_utils/pult/form.cpp
index 7735655..7b1ebb0 100644
--- a/cd_utils/pult/form.cpp
+++ b/cd_utils/pult/form.cpp
@@ -6,6 +6,7 @@ Form::Form(QWidget *parent) : QWidget(parent), ui(new Ui::Form) {
 	ui->setupUi(this);
 	ui->treeView->setKFile("");
 	ui->treeView->refresh();
+	ui->treeView->startPing();
 }