diff --git a/src_main/io_devices/pibinarylog.cpp b/src_main/io_devices/pibinarylog.cpp
index e1eafa3d..b000966c 100644
--- a/src_main/io_devices/pibinarylog.cpp
+++ b/src_main/io_devices/pibinarylog.cpp
@@ -46,7 +46,11 @@
 REGISTER_DEVICE(PIBinaryLog)
 
 PIBinaryLog::PIBinaryLog() {
+#ifdef FREERTOS
+	setThreadedReadBufferSize(512);
+#else
 	setThreadedReadBufferSize(65536);
+#endif
 	is_started = is_indexed = is_pause = false;
 	current_index = -1;
 	setPlaySpeed(1.);
diff --git a/src_main/io_devices/piethernet.cpp b/src_main/io_devices/piethernet.cpp
index 2b7fef22..b6e1ceb2 100755
--- a/src_main/io_devices/piethernet.cpp
+++ b/src_main/io_devices/piethernet.cpp
@@ -263,7 +263,11 @@ void PIEthernet::construct() {
 	setMulticastTTL(1);
 	server_thread_.setData(this);
 	server_thread_.setName("__S__server_thread");
+#ifdef FREERTOS
+	setThreadedReadBufferSize(512);
+#else
 	setThreadedReadBufferSize(65536);
+#endif
 	setPriority(piHigh);
 }
 
diff --git a/src_main/io_devices/piiodevice.cpp b/src_main/io_devices/piiodevice.cpp
index 822737ca..c541ceb1 100755
--- a/src_main/io_devices/piiodevice.cpp
+++ b/src_main/io_devices/piiodevice.cpp
@@ -229,7 +229,8 @@ void PIIODevice::terminate() {
 
 void PIIODevice::begin() {
 	//cout << "   begin\n";
-	if (threadedReadBufferSize() == 0)
+	buffer_tr.resize(threaded_read_buffer_size);
+	if (threaded_read_buffer_size == 0)
 		piCoutObj << "Warning: threadedReadBufferSize() == 0, read may be useless!";
 	thread_started_ = false;
 	if (!opened_) {
@@ -275,10 +276,10 @@ PIByteArray PIIODevice::readForTime(double timeout_ms) {
 	PIByteArray str;
 	if (timeout_ms <= 0.) return str;
 	int ret;
-	uchar * td = new uchar[threadedReadBufferSize()];
+	uchar * td = new uchar[threaded_read_buffer_size];
 	tm.reset();
 	while (tm.elapsed_m() < timeout_ms) {
-		ret = read(td, threadedReadBufferSize());
+		ret = read(td, threaded_read_buffer_size);
 		if (ret <= 0) msleep(PIP_MIN_MSLEEP);
 		else str.append(td, ret);
 	}
@@ -311,12 +312,12 @@ bool PIIODevice::configure(const PIString & config_file, const PIString & sectio
 		if (!ex) setReopenEnabled(em.getValue("reopenEnabled", isReopenEnabled()));
 		setReopenTimeout(ep->getValue("reopenTimeout", reopenTimeout(), &ex));
 		if (!ex) setReopenTimeout(em.getValue("reopenTimeout", reopenTimeout()));
-		setThreadedReadBufferSize(ep->getValue("threadedReadBufferSize", int(buffer_tr.size_s()), &ex));
-		if (!ex) setThreadedReadBufferSize(em.getValue("threadedReadBufferSize", int(buffer_tr.size_s())));
+		setThreadedReadBufferSize(ep->getValue("threadedReadBufferSize", int(threaded_read_buffer_size), &ex));
+		if (!ex) setThreadedReadBufferSize(em.getValue("threadedReadBufferSize", int(threaded_read_buffer_size)));
 	} else {
 		setReopenEnabled(em.getValue("reopenEnabled", isReopenEnabled()));
 		setReopenTimeout(em.getValue("reopenTimeout", reopenTimeout()));
-		setThreadedReadBufferSize(em.getValue("threadedReadBufferSize", int(buffer_tr.size_s())));
+		setThreadedReadBufferSize(em.getValue("threadedReadBufferSize", int(threaded_read_buffer_size)));
 	}
 	return configureDevice(&em, ep);
 }
diff --git a/src_main/io_devices/piiodevice.h b/src_main/io_devices/piiodevice.h
index 2ced538c..b189509b 100755
--- a/src_main/io_devices/piiodevice.h
+++ b/src_main/io_devices/piiodevice.h
@@ -155,10 +155,10 @@ public:
 	/** \brief Set size of threaded read buffer
 	 * \details Default size is 4096 bytes. If your device can read at single read
 	 * more than 4096 bytes you should use this function to adjust buffer size */
-	void setThreadedReadBufferSize(int new_size) {buffer_tr.resize(new_size); threadedReadBufferSizeChanged();}
+	void setThreadedReadBufferSize(int new_size) {threaded_read_buffer_size = new_size; threadedReadBufferSizeChanged();}
 
 	//! Return size of threaded read buffer
-	int threadedReadBufferSize() const {return buffer_tr.size_s();}
+	int threadedReadBufferSize() const {return threaded_read_buffer_size;}
 	
 	//! Return content of threaded read buffer
 	const uchar * threadedReadBuffer() const {return buffer_tr.data();}
@@ -260,10 +260,10 @@ public:
 	static PIStringList availablePrefixes();
 
 	
-	EVENT_HANDLER(bool, open) {if (!init_) init(); opened_ = openDevice(); if (opened_) opened(); return opened_;}
-	EVENT_HANDLER1(bool, open, const PIString &, _path) {setPath(_path); if (!init_) init(); opened_ = openDevice(); if (opened_) opened(); return opened_;}
-	bool open(DeviceMode _mode) {mode_ = _mode; if (!init_) init(); opened_ = openDevice(); if (opened_) opened(); return opened_;}
-	EVENT_HANDLER2(bool, open, const PIString &, _path, DeviceMode, _mode) {setPath(_path); mode_ = _mode; if (!init_) init(); opened_ = openDevice(); if (opened_) opened(); return opened_;}
+	EVENT_HANDLER(bool, open) {if (!init_) init(); buffer_tr.resize(threaded_read_buffer_size); opened_ = openDevice(); if (opened_) opened(); return opened_;}
+	EVENT_HANDLER1(bool, open, const PIString &, _path) {setPath(_path); if (!init_) init(); buffer_tr.resize(threaded_read_buffer_size); opened_ = openDevice(); if (opened_) opened(); return opened_;}
+	bool open(DeviceMode _mode) {mode_ = _mode; if (!init_) init(); buffer_tr.resize(threaded_read_buffer_size); opened_ = openDevice(); if (opened_) opened(); return opened_;}
+	EVENT_HANDLER2(bool, open, const PIString &, _path, DeviceMode, _mode) {setPath(_path); mode_ = _mode; if (!init_) init(); buffer_tr.resize(threaded_read_buffer_size); opened_ = openDevice(); if (opened_) opened(); return opened_;}
 	EVENT_HANDLER(bool, close) {opened_ = !closeDevice(); if (!opened_) closed(); return !opened_;}
 	EVENT_HANDLER1(int, write, PIByteArray, data) {return writeDevice(data.data(), data.size_s());}
 
@@ -411,6 +411,7 @@ private:
 	PIQueue<PIPair<PIByteArray, ullong> > write_queue;
 	ullong tri;
 	int readed_;
+	uint threaded_read_buffer_size;
 	bool init_, thread_started_, raise_threaded_read_;
 
 	static PIMutex nfp_mutex;
diff --git a/src_main/io_devices/pispi.cpp b/src_main/io_devices/pispi.cpp
index d4ba9320..b2ca12a7 100644
--- a/src_main/io_devices/pispi.cpp
+++ b/src_main/io_devices/pispi.cpp
@@ -23,7 +23,11 @@ REGISTER_DEVICE(PISPI)
 
 
 PISPI::PISPI(const PIString & path, uint speed, PIIODevice::DeviceMode mode) : PIIODevice(path, mode) {
+#ifdef FREERTOS
+	setThreadedReadBufferSize(512);
+#else
 	setThreadedReadBufferSize(1024);
+#endif
 	setPath(path);
 	setSpeed(speed);
 	setBits(8);
diff --git a/src_main/io_utils/pibasetransfer.cpp b/src_main/io_utils/pibasetransfer.cpp
index 8d4291e3..3ac42ae1 100644
--- a/src_main/io_utils/pibasetransfer.cpp
+++ b/src_main/io_utils/pibasetransfer.cpp
@@ -20,7 +20,11 @@ PIBaseTransfer::PIBaseTransfer(): crc(standardCRC_16()), diag(false) {
 	diag.setName("PIBaseTransfer");
 	diag.start(50);
 	packets_count = 10;
+#ifdef FREERTOS
+	setPacketSize(512);
+#else
 	setPacketSize(4096);
+#endif
 	randomize();
 }
 
diff --git a/src_main/io_utils/pipacketextractor.cpp b/src_main/io_utils/pipacketextractor.cpp
index db5a9049..24dd176c 100644
--- a/src_main/io_utils/pipacketextractor.cpp
+++ b/src_main/io_utils/pipacketextractor.cpp
@@ -94,7 +94,11 @@ void PIPacketExtractor::construct() {
 	ret_func_header = ret_func_footer = 0;
 	setPayloadSize(0);
 	setTimeout(100);
+#ifdef FREERTOS
+	setBufferSize(512);
+#else
 	setBufferSize(65536);
+#endif
 	setDevice(0);
 	setPacketSize(0);
 	setSplitMode(None);
diff --git a/src_main/thread/pithread.cpp b/src_main/thread/pithread.cpp
index 5780c114..e039bbfe 100755
--- a/src_main/thread/pithread.cpp
+++ b/src_main/thread/pithread.cpp
@@ -224,7 +224,7 @@ bool PIThread::start(int timer_delay) {
 #  endif
 	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	int ret = pthread_create(&PRIVATE->thread, &attr, thread_function, this);
-	piCout << "pthread_create" << PRIVATE->thread;
+	//piCout << "pthread_create" << PRIVATE->thread;
 	pthread_attr_destroy(&attr);
 	if (ret == 0) {
 #  ifdef MAC_OS
@@ -268,7 +268,7 @@ bool PIThread::startOnce() {
 #  endif
 	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	int ret = pthread_create(&(PRIVATE->thread), &attr, thread_function_once, this);
-	piCout << "pthread_create" << PRIVATE->thread;
+	//piCout << "pthread_create" << PRIVATE->thread;
 	pthread_attr_destroy(&attr);
 	if (ret == 0) {
 #  ifdef MAC_OS
@@ -469,7 +469,7 @@ void PIThread::__thread_func__(void * t) {
 	ct.terminating = ct.running_ = false;
 	ct.tid_ = -1;
 	//cout << "thread " << t << " exiting ... " << endl;
-	piCout << "pthread_exit" << (ct.__privateinitializer__.p)->thread;
+	//piCout << "pthread_exit" << (ct.__privateinitializer__.p)->thread;
 	UNREGISTER_THREAD(&ct);
 	PIINTROSPECTION_UNREGISTER_THREAD(ct.tid());
 #ifndef WINDOWS
@@ -518,7 +518,7 @@ void PIThread::__thread_func_once__(void * t) {
 	ct.terminating = ct.running_ = false;
 	ct.tid_ = -1;
 	//cout << "thread " << t << " exiting ... " << endl;
-	piCout << "pthread_exit" << (ct.__privateinitializer__.p)->thread;
+	//piCout << "pthread_exit" << (ct.__privateinitializer__.p)->thread;
 	UNREGISTER_THREAD(&ct);
 	PIINTROSPECTION_UNREGISTER_THREAD(ct.tid());
 #ifndef WINDOWS