diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3aac3296..90b2ed34 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.0)
 cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(pip)
 set(pip_MAJOR    2)
-set(pip_MINOR    37)
+set(pip_MINOR    38)
 set(pip_REVISION 0)
 set(pip_SUFFIX   )
 set(pip_COMPANY  SHS)
diff --git a/doc/examples/piiodevice.cpp b/doc/examples/piiodevice.cpp
index 1afd67d4..0946dc16 100644
--- a/doc/examples/piiodevice.cpp
+++ b/doc/examples/piiodevice.cpp
@@ -3,7 +3,7 @@ void _() {
 	
 //! [0]
 class SomeIO: public PIIODevice {
-	PIIODEVICE(SomeIO)
+	PIIODEVICE(SomeIO, "myio")
 public:
 	SomeIO(): PIIODevice() {}
 protected:
@@ -19,9 +19,8 @@ protected:
 		// write to your device here
 		return written_bytes;
 	}
-	PIString fullPathPrefix() const {return "myio";}
 	void configureFromFullPath(const PIString & full_path) {
-		// parse full_path and configure device there
+		// parse full_path and configure device here
 	}
 };
 REGISTER_DEVICE(SomeIO)
diff --git a/libs/main/cloud/picloudclient.h b/libs/main/cloud/picloudclient.h
index ba21e1b1..9ef77398 100644
--- a/libs/main/cloud/picloudclient.h
+++ b/libs/main/cloud/picloudclient.h
@@ -34,7 +34,7 @@
 
 class PIP_CLOUD_EXPORT PICloudClient: public PIIODevice, public PICloudBase
 {
-	PIIODEVICE(PICloudClient)
+	PIIODEVICE(PICloudClient, "")
 public:
 	explicit PICloudClient(const PIString & path = PIString(), PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
 	virtual ~PICloudClient();
diff --git a/libs/main/cloud/picloudserver.h b/libs/main/cloud/picloudserver.h
index 029177cf..a1c92759 100644
--- a/libs/main/cloud/picloudserver.h
+++ b/libs/main/cloud/picloudserver.h
@@ -32,14 +32,14 @@
 
 class PIP_CLOUD_EXPORT PICloudServer: public PIIODevice, public PICloudBase
 {
-	PIIODEVICE(PICloudServer)
+	PIIODEVICE(PICloudServer, "")
 public:
 	//! PICloudServer
 	explicit PICloudServer(const PIString & path = PIString(), PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
 	virtual ~PICloudServer();
 
 	class Client : public PIIODevice {
-		PIIODEVICE(PICloudServer::Client)
+		PIIODEVICE(PICloudServer::Client, "")
 		friend class PICloudServer;
 	public:
 		Client(PICloudServer * srv = nullptr, uint id = 0);
diff --git a/libs/main/core/piconstchars.cpp b/libs/main/core/piconstchars.cpp
index 0e253350..3edd1d4e 100644
--- a/libs/main/core/piconstchars.cpp
+++ b/libs/main/core/piconstchars.cpp
@@ -48,6 +48,18 @@
 //! \}
 
 
+bool PIConstChars::startsWith(const PIConstChars & str) const {
+	if (size() < str.size()) return false;
+	return str == left(str.size());
+}
+
+
+bool PIConstChars::endsWith(const PIConstChars & str) const {
+	if (size() < str.size()) return false;
+	return str == right(str.size());
+}
+
+
 PIConstChars PIConstChars::mid(const int start, const int len) const {
 	int s = start, l = len;
 	if (l == 0 || s >= (int)size() || isEmpty()) return PIConstChars("");
diff --git a/libs/main/core/piconstchars.h b/libs/main/core/piconstchars.h
index f2805c35..ca684443 100644
--- a/libs/main/core/piconstchars.h
+++ b/libs/main/core/piconstchars.h
@@ -94,6 +94,14 @@ public:
 	//! \~russian Возвращает длину строки в символах.
 	inline ssize_t size_s() const {return len;}
 
+	//! \~english Returns if string starts with "str".
+	//! \~russian Возвращает начинается ли строка со "str".
+	bool startsWith(const PIConstChars & str) const;
+
+	//! \~english Returns if string ends with "str".
+	//! \~russian Возвращает оканчивается ли строка на "str".
+	bool endsWith(const PIConstChars & str) const;
+
 	//! \~english Returns part of string from character at index "start" and maximum length "len".
 	//! \~russian Возвращает подстроку от символа "start" и максимальной длиной "len".
 	//! \~\sa \a left(), \a right()
diff --git a/libs/main/core/piobject.cpp b/libs/main/core/piobject.cpp
index b3a51b7f..ba25bd86 100644
--- a/libs/main/core/piobject.cpp
+++ b/libs/main/core/piobject.cpp
@@ -250,7 +250,7 @@ PIStringList PIObject::scopeList() const {
 	PIMutexLocker ml(__meta_mutex());
 	const PIVector<const char *> & scope(__meta_data()[classNameID()].scope_list);
 	for (const char * c: scope)
-		ret = PIStringAscii(c);
+		ret << PIStringAscii(c);
 	return ret;
 }
 
@@ -727,7 +727,7 @@ void PIObject::dump(const PIString & line_prefix) const {
 
 
 #ifndef MICRO_PIP
-void dumpApplication() {
+void dumpApplication(bool with_objects) {
 	PIMutexLocker _ml(PIObject::mutexObjects());
 	//printf("dump application ...\n");
 	PIDateTime cd = PIDateTime::current();
@@ -745,22 +745,24 @@ void dumpApplication() {
 	PICout(PICoutManipulators::AddNewLine) << "    uptime: " << PITime::fromSystemTime(cd.toSystemTime() - pi->execDateTime.toSystemTime()).toString();
 	PICout(PICoutManipulators::AddNewLine) << "    PIObjects {";
 	PICout(PICoutManipulators::AddNewLine) << "        count: " << PIObject::objects().size_s();
-	piForeachC (PIObject * o, PIObject::objects())
-		o->dump("        ");
+	if (with_objects) {
+		for (const PIObject * o: PIObject::objects())
+			o->dump("        ");
+	}
 	PICout(PICoutManipulators::AddNewLine) << "    }";
 	PICout(PICoutManipulators::AddNewLine) << "}";
 	//printf("dump application done\n");
 }
 
 
-bool dumpApplicationToFile(const PIString & path) {
+bool dumpApplicationToFile(const PIString & path, bool with_objects) {
 	PIFile f(path + "_tmp");
 	f.setName("__S__DumpFile");
 	f.clear();
 	if (!f.open(PIIODevice::WriteOnly)) return false;
 	bool ba = PICout::isBufferActive();
 	PICout::setBufferActive(true, true);
-	dumpApplication();
+	dumpApplication(with_objects);
 	f << PICout::buffer();
 	f.close();
 	PICout::setBufferActive(ba, true);
diff --git a/libs/main/core/piobject.h b/libs/main/core/piobject.h
index 047a32ef..1e63a453 100644
--- a/libs/main/core/piobject.h
+++ b/libs/main/core/piobject.h
@@ -39,7 +39,7 @@ typedef void (*Handler)(void * );
 class PIP_EXPORT PIObject {
 #ifndef MICRO_PIP
 	friend class PIObjectManager;
-	friend void dumpApplication();
+	friend void dumpApplication(bool);
 	friend class PIIntrospection;
 #endif
 	typedef PIObject __PIObject__;
@@ -587,8 +587,8 @@ private:
 };
 
 #ifndef MICRO_PIP
-PIP_EXPORT void dumpApplication();
-PIP_EXPORT bool dumpApplicationToFile(const PIString & path);
+PIP_EXPORT void dumpApplication(bool with_objects = true);
+PIP_EXPORT bool dumpApplicationToFile(const PIString & path, bool with_objects = true);
 #endif
 
 #endif // PIOBJECT_H
diff --git a/libs/main/io_devices/pibinarylog.cpp b/libs/main/io_devices/pibinarylog.cpp
index df1404d5..5d30d59f 100644
--- a/libs/main/io_devices/pibinarylog.cpp
+++ b/libs/main/io_devices/pibinarylog.cpp
@@ -791,7 +791,7 @@ void PIBinaryLog::configureFromVariantDevice(const PIPropertyStorage & d) {
 }
 
 
-void PIBinaryLog::propertyChanged(const PIString &s) {
+void PIBinaryLog::propertyChanged(const char * s) {
 	default_id = property("defaultID").toInt();
 	rapid_start = property("rapidStart").toBool();
 	play_mode = (PlayMode)property("playMode").toInt();
diff --git a/libs/main/io_devices/pibinarylog.h b/libs/main/io_devices/pibinarylog.h
index 3e799ab2..98db407f 100644
--- a/libs/main/io_devices/pibinarylog.h
+++ b/libs/main/io_devices/pibinarylog.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PIBinaryLog: public PIIODevice
 {
-	PIIODEVICE(PIBinaryLog)
+	PIIODEVICE(PIBinaryLog, "binlog")
 public:
 	explicit PIBinaryLog();
 	virtual ~PIBinaryLog();
@@ -288,7 +288,6 @@ public:
 	static bool cutBinLog(const BinLogInfo & src, const PIString & dst, int from, int to);
 
 protected:
-	PIString fullPathPrefix() const {return PIStringAscii("binlog");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;
@@ -297,7 +296,7 @@ protected:
 	int writeDevice(const void * data, int size) {return writeBinLog(default_id, data, size);}
 	bool openDevice();
 	bool closeDevice();
-	void propertyChanged(const PIString &);
+	void propertyChanged(const char * s);
 	bool threadedRead(uchar *readed, int size);
 	void threadedReadTerminated() {pausemutex.unlock();}
 	DeviceInfoFlags deviceInfoFlags() const {return PIIODevice::Reliable;}
diff --git a/libs/main/io_devices/pican.h b/libs/main/io_devices/pican.h
index 1b7d5a59..d9d6240c 100644
--- a/libs/main/io_devices/pican.h
+++ b/libs/main/io_devices/pican.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PICAN: public PIIODevice
 {
-	PIIODEVICE(PICAN)
+	PIIODEVICE(PICAN, "can")
 public:
 	explicit PICAN(const PIString & path = PIString(), PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
 	virtual ~PICAN();
@@ -45,7 +45,6 @@ protected:
 	bool closeDevice();
 	int readDevice(void * read_to, int max_size);
 	int writeDevice(const void * data, int max_size);
-	PIString fullPathPrefix() const {return PIStringAscii("can");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;
diff --git a/libs/main/io_devices/piethernet.cpp b/libs/main/io_devices/piethernet.cpp
index 77b7f7d4..1070f635 100644
--- a/libs/main/io_devices/piethernet.cpp
+++ b/libs/main/io_devices/piethernet.cpp
@@ -21,6 +21,7 @@
 #include "piconfig.h"
 #include "pisysteminfo.h"
 #include "pipropertystorage.h"
+#include "piconstchars.h"
 #ifdef QNX
 #  include <net/if.h>
 #  include <net/if_dl.h>
@@ -919,10 +920,11 @@ bool PIEthernet::configureDevice(const void * e_main, const void * e_parent) {
 }
 
 
-void PIEthernet::propertyChanged(const PIString & name) {
-	if (name.endsWith("Timeout")) applyTimeouts();
-	if (name == "TTL") applyOptInt(IPPROTO_IP, IP_TTL, TTL());
-	if (name == "MulticastTTL") applyOptInt(IPPROTO_IP, IP_MULTICAST_TTL, multicastTTL());
+void PIEthernet::propertyChanged(const char * name) {
+	PIConstChars pn(name);
+	if (pn.endsWith("Timeout")) applyTimeouts();
+	if (pn == "TTL") applyOptInt(IPPROTO_IP, IP_TTL, TTL());
+	if (pn == "MulticastTTL") applyOptInt(IPPROTO_IP, IP_MULTICAST_TTL, multicastTTL());
 }
 
 
diff --git a/libs/main/io_devices/piethernet.h b/libs/main/io_devices/piethernet.h
index 835f953c..675471dc 100644
--- a/libs/main/io_devices/piethernet.h
+++ b/libs/main/io_devices/piethernet.h
@@ -38,7 +38,7 @@ class
 
 class PIP_EXPORT PIEthernet: public PIIODevice
 {
-	PIIODEVICE(PIEthernet)
+	PIIODEVICE(PIEthernet, "eth")
 	friend class PIPeer;
 public:
 	
@@ -462,9 +462,8 @@ public:
 protected:
 	explicit PIEthernet(int sock, PIString ip_port);
 
-	void propertyChanged(const PIString & name);
+	void propertyChanged(const char * name);
 	
-	PIString fullPathPrefix() const {return PIStringAscii("eth");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;
diff --git a/libs/main/io_devices/pifile.h b/libs/main/io_devices/pifile.h
index 3d2e7463..a2fd8568 100644
--- a/libs/main/io_devices/pifile.h
+++ b/libs/main/io_devices/pifile.h
@@ -32,7 +32,7 @@
 
 class PIP_EXPORT PIFile: public PIIODevice
 {
-	PIIODEVICE(PIFile)
+	PIIODEVICE(PIFile, "file")
 public:
 	
 	//! Constructs an empty file
@@ -289,7 +289,6 @@ public:
 //! \}
 
 protected:
-	PIString fullPathPrefix() const {return PIStringAscii("file");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;
diff --git a/libs/main/io_devices/piiobytearray.h b/libs/main/io_devices/piiobytearray.h
index 1921b5d0..15baa3a7 100644
--- a/libs/main/io_devices/piiobytearray.h
+++ b/libs/main/io_devices/piiobytearray.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PIIOByteArray: public PIIODevice
 {
-	PIIODEVICE(PIIOByteArray)
+	PIIODEVICE(PIIOByteArray, "")
 public:
 	
 	//! Contructs %PIIOByteArray with \"buffer\" content and \"mode\" open mode
diff --git a/libs/main/io_devices/piiodevice.cpp b/libs/main/io_devices/piiodevice.cpp
index ba540439..28d1bc4b 100644
--- a/libs/main/io_devices/piiodevice.cpp
+++ b/libs/main/io_devices/piiodevice.cpp
@@ -84,7 +84,6 @@
 //!
 //! \section PIIODevice_sec7 Creating devices by unambiguous string
 //! There are some virtual functions to describe child class without its declaration.
-//! \n \a fullPathPrefix() should returns unique prefix of device
 //! \n \a constructFullPath() should returns full unambiguous string, contains prefix and all device parameters
 //! \n \a configureFromFullPath() provide configuring device from full unambiguous string without prefix and "://"
 //! \n Macro PIIODEVICE should be used instead of PIOBJECT
@@ -265,15 +264,14 @@ void PIIODevice::write_func() {
 }
 
 
-PIIODevice * PIIODevice::newDeviceByPrefix(const PIString & prefix) {
-	if (prefix.isEmpty()) return 0;
-	PIVector<const PIObject * > rd(PICollection::groupElements("__PIIODevices__"));
-	piForeachC (PIObject * d, rd) {
-		if (prefix == ((const PIIODevice * )d)->fullPathPrefix()) {
-			return ((const PIIODevice * )d)->copy();
-		}
+PIIODevice * PIIODevice::newDeviceByPrefix(const char * prefix) {
+	if (!prefix) return nullptr;
+	PIConstChars p(prefix);
+	for (const auto & i: fabrics()) {
+		if (i.first == p)
+			return i.second();
 	}
-	return 0;
+	return nullptr;
 }
 
 
@@ -427,7 +425,7 @@ bool PIIODevice::configure(const PIString & config_file, const PIString & sectio
 
 
 PIString PIIODevice::constructFullPath() const {
-	return fullPathPrefix() + "://" + constructFullPathDevice() + fullPathOptions();
+	return PIStringAscii(fullPathPrefix()) + PIStringAscii("://") + constructFullPathDevice() + fullPathOptions();
 }
 
 
@@ -489,14 +487,21 @@ void PIIODevice::splitFullPath(PIString fpwm, PIString * full_path, DeviceMode *
 
 PIStringList PIIODevice::availablePrefixes() {
 	PIStringList ret;
-	PIVector<const PIObject * > rd(PICollection::groupElements("__PIIODevices__"));
-	piForeachC (PIObject * d, rd) {
-		ret << ((const PIIODevice * )d)->fullPathPrefix();
-	}
+	for (const auto & i: fabrics())
+		ret << i.first.toString();
 	return ret;
 }
 
 
+void PIIODevice::registerDevice(const char * prefix, PIIODevice * (*fabric)()) {
+	PIConstChars p(prefix);
+	if (p.isEmpty()) return;
+	//printf("registerDevice %s %d %d\n", prefix, p.isEmpty(), fabrics().size());
+	if (!fabrics().contains(p))
+		fabrics()[p] = fabric;
+}
+
+
 PIString PIIODevice::fullPathOptions() const {
 	if (mode_ == ReadWrite && options_ == 0) return PIString();
 	PIString ret(" (");
@@ -511,8 +516,8 @@ PIString PIIODevice::fullPathOptions() const {
 
 PIIODevice * PIIODevice::createFromFullPath(const PIString & full_path) {
 	PIString prefix = full_path.left(full_path.find(":"));
-	PIIODevice * nd = newDeviceByPrefix(prefix);
-	if (!nd) return 0;
+	PIIODevice * nd = newDeviceByPrefix(prefix.dataAscii());
+	if (!nd) return nullptr;
 	nd->configureFromFullPath(full_path.mid(prefix.length() + 3));
 	cacheFullPath(full_path, nd);
 	return nd;
@@ -520,8 +525,8 @@ PIIODevice * PIIODevice::createFromFullPath(const PIString & full_path) {
 
 
 PIIODevice * PIIODevice::createFromVariant(const PIVariantTypes::IODevice & d) {
-	PIIODevice * nd = newDeviceByPrefix(d.prefix);
-	if (!nd) return 0;
+	PIIODevice * nd = newDeviceByPrefix(d.prefix.dataAscii());
+	if (!nd) return nullptr;
 	nd->configureFromVariant(d);
 	return nd;
 }
@@ -550,6 +555,12 @@ void PIIODevice::cacheFullPath(const PIString & full_path, const PIIODevice * d)
 }
 
 
+PIMap<PIConstChars, PIIODevice * (*)()> & PIIODevice::fabrics() {
+	static PIMap<PIConstChars, PIIODevice * (*)()> ret;
+	return ret;
+}
+
+
 bool PIIODevice::threadedRead(uchar *readed, int size) {
 //	piCout << "iodevice threaded read";
 	if (ret_func_ != 0) return ret_func_(ret_data_, readed, size);
diff --git a/libs/main/io_devices/piiodevice.h b/libs/main/io_devices/piiodevice.h
index 66b915f5..ff47ccc6 100644
--- a/libs/main/io_devices/piiodevice.h
+++ b/libs/main/io_devices/piiodevice.h
@@ -27,7 +27,6 @@
 #define PIIODEVICE_H
 
 #include "piinit.h"
-#include "picollection.h"
 #include "pitimer.h"
 #include "piqueue.h"
 
@@ -42,16 +41,26 @@ typedef bool (*ReadRetFunc)(void * , uchar * , int );
 #  define REGISTER_DEVICE(class)
 
 //! \relatesalso PIIODevice \brief Use this macro instead of PIOBJECT when describe your own PIIODevice
-#  define PIIODEVICE(class)
+#  define PIIODEVICE(class, "prefix")
 
 #else
 
-#  define REGISTER_DEVICE(name) ADD_NEW_TO_COLLECTION_WITH_NAME(__PIIODevices__, name, __S__collection_##name##__)
-#  define PIIODEVICE(name) PIOBJECT_SUBCLASS(name, PIIODevice) PIIODevice * copy() const {return new name();}
+#  define REGISTER_DEVICE(name) \
+	STATIC_INITIALIZER_BEGIN \
+		PIIODevice::registerDevice(name::fullPathPrefixS(), []()->PIIODevice*{return new name();});\
+	STATIC_INITIALIZER_END
+
+#  define PIIODEVICE(name, prefix) \
+		PIOBJECT_SUBCLASS(name, PIIODevice) \
+		PIIODevice * copy() const {return new name();} \
+	public: \
+		virtual const char * fullPathPrefix() const {return prefix;} \
+		static const char * fullPathPrefixS() {return prefix;} \
+	private:
+
 
 #endif
 
-
 class PIP_EXPORT PIIODevice: public PIThread
 {
 	PIOBJECT_SUBCLASS(PIIODevice, PIThread)
@@ -228,8 +237,10 @@ public:
 	bool configure(const PIString & config_file, const PIString & section, bool parent_section = false);
 	
 	
-	//! Reimplement to construct full unambiguous string prefix. \ref PIIODevice_sec7
-	virtual PIString fullPathPrefix() const {return PIString();}
+	//! Returns full unambiguous string prefix. \ref PIIODevice_sec7
+	virtual const char * fullPathPrefix() const {return "";}
+
+	static const char * fullPathPrefixS() {return "";}
 	
 	//! Returns full unambiguous string, describes this device, \a fullPathPrefix() + "://"
 	PIString constructFullPath() const;
@@ -260,6 +271,8 @@ public:
 	//! Returns fullPath prefixes of all registered devices
 	static PIStringList availablePrefixes();
 
+	static void registerDevice(const char * prefix, PIIODevice*(*fabric)());
+
 	
 	EVENT_HANDLER(bool, open);
 	EVENT_HANDLER1(bool, open, const PIString &, _path);
@@ -386,7 +399,7 @@ protected:
 	//! Invoked after hard write thread stop
 	virtual void threadedWriteTerminated() {;}
 
-	static PIIODevice * newDeviceByPrefix(const PIString & prefix);
+	static PIIODevice * newDeviceByPrefix(const char * prefix);
 
 	void terminate();
 	
@@ -408,6 +421,7 @@ private:
 	void run();
 	void end() {terminate();}
 	static void cacheFullPath(const PIString & full_path, const PIIODevice * d);
+	static PIMap<PIConstChars, PIIODevice*(*)()> & fabrics();
 
 	PITimer timer;
 	PITimeMeasurer tm;
diff --git a/libs/main/io_devices/piiostring.h b/libs/main/io_devices/piiostring.h
index f0a9bd53..fc59d782 100644
--- a/libs/main/io_devices/piiostring.h
+++ b/libs/main/io_devices/piiostring.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PIIOString: public PIIODevice
 {
-	PIIODEVICE(PIIOString)
+	PIIODEVICE(PIIOString, "")
 public:
 	
 	//! Contructs %PIIOString with \"string\" content and \"mode\" open mode
diff --git a/libs/main/io_devices/pipeer.h b/libs/main/io_devices/pipeer.h
index 389f36fd..a592eb90 100644
--- a/libs/main/io_devices/pipeer.h
+++ b/libs/main/io_devices/pipeer.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PIPeer: public PIIODevice
 {
-	PIIODEVICE(PIPeer)
+	PIIODEVICE(PIPeer, "peer")
 private:
 	class PeerData;
 	
@@ -168,7 +168,6 @@ private:
 
 	bool openDevice();
 	bool closeDevice();
-	PIString fullPathPrefix() const {return PIStringAscii("peer");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString &full_path);
 	PIPropertyStorage constructVariantDevice() const;
diff --git a/libs/main/io_devices/piserial.h b/libs/main/io_devices/piserial.h
index d423e83e..dce78ad7 100644
--- a/libs/main/io_devices/piserial.h
+++ b/libs/main/io_devices/piserial.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PISerial: public PIIODevice
 {
-	PIIODEVICE(PISerial)
+	PIIODEVICE(PISerial, "ser")
 public:
 	
 	//! Contructs an empty %PISerial
@@ -231,7 +231,6 @@ public:
 //! \}
 	
 protected:
-	PIString fullPathPrefix() const {return PIStringAscii("ser");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;
diff --git a/libs/main/io_devices/pisharedmemory.h b/libs/main/io_devices/pisharedmemory.h
index baac7c91..b9bcf107 100644
--- a/libs/main/io_devices/pisharedmemory.h
+++ b/libs/main/io_devices/pisharedmemory.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PISharedMemory: public PIIODevice
 {
-	PIIODEVICE(PISharedMemory)
+	PIIODEVICE(PISharedMemory, "shm")
 public:
 	
 	explicit PISharedMemory();
@@ -76,7 +76,6 @@ public:
 protected:
 	bool openDevice();
 	bool closeDevice();
-	PIString fullPathPrefix() const {return PIStringAscii("shm");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;
diff --git a/libs/main/io_devices/pispi.h b/libs/main/io_devices/pispi.h
index c7d3c0f9..3ca4b0a2 100644
--- a/libs/main/io_devices/pispi.h
+++ b/libs/main/io_devices/pispi.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PISPI: public PIIODevice
 {
-	PIIODEVICE(PISPI)
+	PIIODEVICE(PISPI, "spi")
 public:
 	explicit PISPI(const PIString & path = PIString(), uint speed_hz = 1000000, PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
 	virtual ~PISPI();
@@ -67,7 +67,6 @@ protected:
 	int readDevice(void * read_to, int max_size);
 	int writeDevice(const void * data, int max_size);
 
-	PIString fullPathPrefix() const {return PIStringAscii("spi");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;
diff --git a/libs/main/io_devices/pitransparentdevice.h b/libs/main/io_devices/pitransparentdevice.h
index ad12c7d9..90b19cf4 100644
--- a/libs/main/io_devices/pitransparentdevice.h
+++ b/libs/main/io_devices/pitransparentdevice.h
@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PITransparentDevice: public PIIODevice
 {
-	PIIODEVICE(PITransparentDevice)
+	PIIODEVICE(PITransparentDevice, "tr")
 public:
 	
 	//! Contructs empty %PITransparentDevice
@@ -44,7 +44,6 @@ protected:
 	bool closeDevice();
 	int readDevice(void * read_to, int max_size);
 	int writeDevice(const void * data, int max_size);
-	PIString fullPathPrefix() const {return PIStringAscii("tr");}
 	DeviceInfoFlags deviceInfoFlags() const {return PIIODevice::Reliable;}
 
 	PIMutex que_mutex;
diff --git a/libs/main/io_devices/piusb.h b/libs/main/io_devices/piusb.h
index c54889c0..87c69e70 100644
--- a/libs/main/io_devices/piusb.h
+++ b/libs/main/io_devices/piusb.h
@@ -63,7 +63,7 @@ struct usb_dev_handle;
 
 class PIP_EXPORT PIUSB: public PIIODevice
 {
-	PIIODEVICE(PIUSB)
+	PIIODEVICE(PIUSB, "usb")
 public:
 	explicit PIUSB(ushort vid = 0, ushort pid = 0);
 	virtual ~PIUSB();
@@ -160,7 +160,6 @@ public:
 	void flush();
 
 protected:
-	PIString fullPathPrefix() const {return PIStringAscii("usb");}
 	bool configureDevice(const void * e_main, const void * e_parent = 0);
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
diff --git a/libs/main/io_utils/pidiagnostics.cpp b/libs/main/io_utils/pidiagnostics.cpp
index bb54d881..02ed1570 100644
--- a/libs/main/io_utils/pidiagnostics.cpp
+++ b/libs/main/io_utils/pidiagnostics.cpp
@@ -225,7 +225,7 @@ PIDiagnostics::Entry PIDiagnostics::calcHistory(PIQueue<Entry> & hist, int & cnt
 }
 
 
-void PIDiagnostics::propertyChanged(const PIString &) {
+void PIDiagnostics::propertyChanged(const char *) {
 	float disct = property("disconnectTimeout").toFloat();
 	changeDisconnectTimeout(disct);
 }
diff --git a/libs/main/io_utils/pidiagnostics.h b/libs/main/io_utils/pidiagnostics.h
index f1b4ed63..fc7cacc1 100644
--- a/libs/main/io_utils/pidiagnostics.h
+++ b/libs/main/io_utils/pidiagnostics.h
@@ -140,7 +140,7 @@ private:
 
 	void tick(void *, int);
 	Entry calcHistory(PIQueue<Entry> & hist, int & cnt);
-	void propertyChanged(const PIString &);
+	void propertyChanged(const char *);
 	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 996ad08f..08908e84 100644
--- a/libs/main/io_utils/pipacketextractor.cpp
+++ b/libs/main/io_utils/pipacketextractor.cpp
@@ -107,7 +107,7 @@ void PIPacketExtractor::construct() {
 }
 
 
-void PIPacketExtractor::propertyChanged(const PIString &) {
+void PIPacketExtractor::propertyChanged(const char *) {
 	packetSize_ = property("packetSize").toInt();
 	mode_ = (SplitMode)(property("splitMode").toInt());
 	dataSize = property("payloadSize").toInt();
diff --git a/libs/main/io_utils/pipacketextractor.h b/libs/main/io_utils/pipacketextractor.h
index 15846b9a..f779a997 100644
--- a/libs/main/io_utils/pipacketextractor.h
+++ b/libs/main/io_utils/pipacketextractor.h
@@ -33,7 +33,7 @@ typedef bool (*PacketExtractorCheckFunc)(void * , uchar * , uchar * , int );
 
 class PIP_EXPORT PIPacketExtractor: public PIIODevice
 {
-	PIIODEVICE(PIPacketExtractor)
+	PIIODEVICE(PIPacketExtractor, "pckext")
 	friend class PIConnection;
 public:
 
@@ -161,11 +161,10 @@ protected:
 
 private:
 	void construct();
-	void propertyChanged(const PIString & );
+	void propertyChanged(const char *);
 	int readDevice(void * read_to, int max_size) {if (dev == 0) return -1; return dev->read(read_to, max_size);}
 	int writeDevice(const void * data, int max_size) {if (dev == 0) return -1; return dev->write(data, max_size);}
 	bool threadedRead(uchar * readed, int size);
-	PIString fullPathPrefix() const {return PIStringAscii("pckext");}
 	PIString constructFullPathDevice() const;
 	bool openDevice() {if (dev == 0) return false; return dev->open();}
 	bool closeDevice() {if (dev == 0) return false; return dev->close();}
diff --git a/main.cpp b/main.cpp
index 690214fd..ca852d33 100644
--- a/main.cpp
+++ b/main.cpp
@@ -38,15 +38,38 @@ int main(int argc, char * argv[]) {
 	cmp(PIConstChars("1a"), PIConstChars("1b"));
 	cmp(PIConstChars("1c"), PIConstChars("1b"));*/
 
-	PIMap<PIConstChars, int> map;
+	/*PIMap<PIConstChars, int> map;
 	map[PIConstChars()] = 0;
 	map[PIConstChars()] = -1;
 	map["_2"] = 22;
 	map["1"] = 11;
 	map["__3"] = 33;
 	map["10"] = 10;
+	map[""] = 999;
 	piCout << map;
 
+	piCout << PIConstChars().toString();
+	piCout << PIConstChars("").toString();
+	piCout << PIConstChars("str").toString();
+	PIConstChars s = "  1 2 \t";
+	piCout <<  "trim:";
+	PICout(DefaultControls | AddQuotes) << s.trimmed();
+	PICout(DefaultControls | AddQuotes) << s;
+	PICout(DefaultControls | AddQuotes) << s.isEmpty();*/
+
+	/*piCout << PIIODevice::availablePrefixes();
+	auto * d = PIIODevice::createFromFullPath("ser://COM1");
+	piCout << "";
+	piCout << d;
+	d->dump();
+	d = PIIODevice::createFromFullPath("eth://udp:127.0.0.1:5000");
+	piCout << "";
+	piCout << d;
+	d->dump();*/
+
+	piCout << "";
+	dumpApplication();
+
 	return 0;
 
 	auto rstr = PIString::fromUTF8("ascii русский!");