diff --git a/src/TactiloController/ovpCBoxAlgorithmTactiloController.cpp b/src/TactiloController/ovpCBoxAlgorithmTactiloController.cpp
index 02a1eb5..28e6a17 100644
--- a/src/TactiloController/ovpCBoxAlgorithmTactiloController.cpp
+++ b/src/TactiloController/ovpCBoxAlgorithmTactiloController.cpp
@@ -1,138 +1,146 @@
-///-------------------------------------------------------------------------------------------------
-/// 
-/// \file ovpCBoxAlgorithmTactiloController.cpp
-/// \brief Functions of the Box Tactilo Controller.
-/// \author Tobias Baumann (TH-Nürnberg).
-/// \version 1.0.
-/// \date Mon Feb 21 14:59:56 2022.
-/// \copyright <a href="https://choosealicense.com/licenses/agpl-3.0/">GNU Affero General Public License v3.0</a>.
-/// 
-///-------------------------------------------------------------------------------------------------
-
-//includes
-#include "ovpCBoxAlgorithmTactiloController.h"
-#include <string>
-
-using namespace OpenViBE;
-using namespace /*OpenViBE::*/Kernel;
-using namespace /*OpenViBE::*/Plugins;
-using namespace /*OpenViBE::Plugins::*/Tactilebci;
-
-/*******************************************************************************/
-
-bool CBoxAlgorithmTactiloController::initialize()
-{
-	m_StimDecoder.initialize(*this, 0);
-	m_StimEncoder.initialize(*this, 0);
-	
-	//get Box Settings
-	m_PortName  = FSettingValueAutoCast(*this->getBoxAlgorithmContext(), 0);
-	m_RowBase   = FSettingValueAutoCast(*this->getBoxAlgorithmContext(), 1);
-	m_nTactilos = FSettingValueAutoCast(*this->getBoxAlgorithmContext(), 2);
-	
-	//set m_nTactilos to 2 if lower than 2
-	if(m_nTactilos < 2)
-	{
-		m_nTactilos = 2;
-	}
-	//set m_nTactilos to MAX if greater than MAX_TACTILOS
-	if(m_nTactilos > MAX_TACTILOS)
-	{
-		m_nTactilos = MAX_TACTILOS;
-	}
-	
-	//open serial port and set baudrate to 115200
-	m_Port.open(m_PortName.toASCIIString());
-  	m_Port.set_option(boost::asio::serial_port::baud_rate(115200));
-	
-	if(m_Port.is_open())
-	{
-		this->getLogManager() << LogLevel_Info << "Connected to Serial Port: " << m_PortName << "\n";
-		m_Port.write_some(boost::asio::buffer("b"));
-	}
-	
-	return true;
-}
-
-/*******************************************************************************/
-
-bool CBoxAlgorithmTactiloController::uninitialize()
-{
-	this->getLogManager() << LogLevel_Info << "Disconnect from Serial Port: " << m_PortName << "\n";
-	m_Port.write_some(boost::asio::buffer("e"));
-	m_Port.close();
-
-	m_StimDecoder.uninitialize();
-	m_StimEncoder.uninitialize();
-	
-	return true;
-}
-
-/*******************************************************************************/
-
-bool CBoxAlgorithmTactiloController::processInput(const size_t index)
-{
-	// some pre-processing code if needed...
-
-	// ready to process !
-	getBoxAlgorithmContext()->markAlgorithmAsReadyToProcess();
-
-	return true;
-}
-
-/*******************************************************************************/
-bool CBoxAlgorithmTactiloController::process()
-{
-	
-	// the static box context describes the box inputs, outputs, settings structures
-	const IBox& staticBoxContext = this->getStaticBoxContext();
-	// the dynamic box context describes the current state of the box inputs and outputs (i.e. the chunks)
-	IBoxIO& boxContext       = this->getDynamicBoxContext();
-	
-	uint64_t StimulationID   = 0;
-	uint64_t ChunkStartTime  = 0;
-	uint64_t ChunkEndTime    = 0;
-	uint64_t Size            = 0;
-	const uint8_t*  Buffer   = nullptr;    
-
-	//iterate over all chunk on input 0
-	for (uint64_t i = 0; i < boxContext.getInputChunkCount(0); ++i)
-	{
-		// decode the chunk i
-		m_StimDecoder.decode(i);
-
-		if(m_StimDecoder.isBufferReceived())
-		{
-			//check received stimulations
-			IStimulationSet* StimSet = m_StimDecoder.getOutputStimulationSet();
-			for(uint64_t j=0; j<StimSet->getStimulationCount(); j++)
-			{
-				StimulationID   = StimSet->getStimulationIdentifier(j);
-				
-				if(StimulationID >= m_RowBase && StimulationID < (m_RowBase + m_nTactilos))
-				{				
-					m_currTactiloNr = StimulationID-m_RowBase+1;
-				}
-				if(StimulationID == OVTK_StimulationId_VisualStimulationStart)
-				{
-					this->getLogManager() << LogLevel_Debug << "Tactilo Nr. " << m_currTactiloNr << " ON\n";
-					m_Port.write_some(boost::asio::buffer(std::to_string(m_currTactiloNr-1)));
-				}
-				if(StimulationID == OVTK_StimulationId_VisualStimulationStop)
-				{
-					this->getLogManager() << LogLevel_Debug << "Tactilo Nr. " << m_currTactiloNr << " OFF\n";
-					m_Port.write_some(boost::asio::buffer(std::to_string(m_currTactiloNr-1)));
-				}
-			}
-		}
-		// forward input chunks
-		boxContext.getInputChunk(0, i, ChunkStartTime, ChunkEndTime, Size, Buffer);
-		boxContext.appendOutputChunkData(0, Buffer, Size);
-		boxContext.markOutputAsReadyToSend(0, ChunkStartTime, ChunkEndTime);
-		boxContext.markInputAsDeprecated(0, i);
-	}
-
-	return true;
-}
-
-/*******************************************************************************/
\ No newline at end of file
+///-------------------------------------------------------------------------------------------------
+/// 
+/// \file ovpCBoxAlgorithmTactiloController.cpp
+/// \brief Functions of the Box Tactilo Controller.
+/// \author Tobias Baumann (TH-Nürnberg).
+/// \version 1.0.
+/// \date Mon Feb 21 14:59:56 2022.
+/// \copyright <a href="https://choosealicense.com/licenses/agpl-3.0/">GNU Affero General Public License v3.0</a>.
+/// 
+///-------------------------------------------------------------------------------------------------
+
+//includes
+#include "ovpCBoxAlgorithmTactiloController.h"
+
+using namespace OpenViBE;
+using namespace /*OpenViBE::*/Kernel;
+using namespace /*OpenViBE::*/Plugins;
+using namespace /*OpenViBE::Plugins::*/Tactilebci;
+
+/*******************************************************************************/
+
+bool CBoxAlgorithmTactiloController::initialize()
+{
+	m_StimDecoder.initialize(*this, 0);
+	m_StimEncoder.initialize(*this, 0);
+	
+	//get Box Settings
+	m_PortName  = FSettingValueAutoCast(*this->getBoxAlgorithmContext(), 0);
+	m_RowBase   = FSettingValueAutoCast(*this->getBoxAlgorithmContext(), 1);
+	m_nTactilos = FSettingValueAutoCast(*this->getBoxAlgorithmContext(), 2);
+	
+	//set m_nTactilos to 2 if lower than 2
+	if(m_nTactilos < 2)
+	{
+		m_nTactilos = 2;
+	}
+	//set m_nTactilos to MAX if greater than MAX_TACTILOS
+	if(m_nTactilos > MAX_TACTILOS)
+	{
+		m_nTactilos = MAX_TACTILOS;
+	}
+	
+	//open serial port and set baudrate to 115200
+	m_Port.open(m_PortName.toASCIIString());
+  	m_Port.set_option(boost::asio::serial_port::baud_rate(115200));
+	
+	if(m_Port.is_open())
+	{
+		this->getLogManager() << LogLevel_Info << "Connected to Serial Port: " << m_PortName << "\n";
+		m_Port.write_some(boost::asio::buffer("b"));
+	}
+	
+	return true;
+}
+
+/*******************************************************************************/
+
+bool CBoxAlgorithmTactiloController::uninitialize()
+{
+	this->getLogManager() << LogLevel_Info << "Disconnect from Serial Port: " << m_PortName << "\n";
+	m_Port.write_some(boost::asio::buffer("e"));
+	m_Port.close();
+
+	m_StimDecoder.uninitialize();
+	m_StimEncoder.uninitialize();
+	
+	return true;
+}
+
+/*******************************************************************************/
+
+bool CBoxAlgorithmTactiloController::processInput(const size_t index)
+{
+	// some pre-processing code if needed...
+
+	// ready to process !
+	getBoxAlgorithmContext()->markAlgorithmAsReadyToProcess();
+
+	return true;
+}
+
+/*******************************************************************************/
+bool CBoxAlgorithmTactiloController::process()
+{
+	
+	// the static box context describes the box inputs, outputs, settings structures
+	const IBox& staticBoxContext = this->getStaticBoxContext();
+	// the dynamic box context describes the current state of the box inputs and outputs (i.e. the chunks)
+	IBoxIO& boxContext       = this->getDynamicBoxContext(); 
+
+	uint64_t ChunkStartTime  = 0;
+	uint64_t ChunkEndTime    = 0;
+	uint64_t Size            = 0;
+	const uint8_t*  Buffer   = nullptr; 	
+
+	//iterate over all chunk on input 0
+	for (uint64_t i = 0; i < boxContext.getInputChunkCount(0); ++i)
+	{
+		// decode the chunk i
+		m_StimDecoder.decode(i);
+		
+		if(m_StimDecoder.isBufferReceived())
+		{
+			//check received stimulations
+			CStimulationSet* StimSet = m_StimDecoder.getOutputStimulationSet();
+			for(uint64_t j=0; j<StimSet->size(); j++)
+			{
+				uint64_t StimulationID   = StimSet->getId(j);
+				
+				if(StimulationID >= m_RowBase && StimulationID < (m_RowBase + m_nTactilos))
+				{				
+					m_currTactiloNr = StimulationID-m_RowBase+1;
+				}
+				if(StimulationID == OVTK_StimulationId_VisualStimulationStart)
+				{
+					this->getLogManager() << LogLevel_Debug << "Tactilo Nr. " << m_currTactiloNr << " ON\n";
+					boost::asio::async_write(m_Port, boost::asio::buffer(std::to_string(m_currTactiloNr-1), 1), boost::bind(&CBoxAlgorithmTactiloController::handler, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
+				}
+				if(StimulationID == OVTK_StimulationId_VisualStimulationStop)
+				{
+					this->getLogManager() << LogLevel_Debug << "Tactilo Nr. " << m_currTactiloNr << " OFF\n";
+					boost::asio::async_write(m_Port, boost::asio::buffer(std::to_string(m_currTactiloNr-1), 1), boost::bind(&CBoxAlgorithmTactiloController::handler, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
+				}
+			}
+		}
+
+		// forward input chunks
+		boxContext.getInputChunk(0, i, ChunkStartTime, ChunkEndTime, Size, Buffer);
+		boxContext.appendOutputChunkData(0, Buffer, Size);
+		boxContext.markOutputAsReadyToSend(0, ChunkStartTime, ChunkEndTime);
+		boxContext.markInputAsDeprecated(0, i);
+
+	}
+
+	return true;
+}
+
+/*******************************************************************************/
+
+void CBoxAlgorithmTactiloController::handler(const boost::system::error_code& error, std::size_t bytes_transferred)
+{
+	if(error)
+	{
+		this->getLogManager() << LogLevel_Warning << error.message() << "\n";
+	}
+}
\ No newline at end of file
diff --git a/src/TactiloController/ovpCBoxAlgorithmTactiloController.h b/src/TactiloController/ovpCBoxAlgorithmTactiloController.h
index 14e1704..c036925 100644
--- a/src/TactiloController/ovpCBoxAlgorithmTactiloController.h
+++ b/src/TactiloController/ovpCBoxAlgorithmTactiloController.h
@@ -17,6 +17,7 @@
 #include <openvibe/ov_all.h>
 #include <toolkit/ovtk_all.h>
 #include <boost/asio.hpp>
+#include <boost/bind.hpp>
 #include <string>
 
 namespace OpenViBE
@@ -35,7 +36,10 @@ namespace OpenViBE
 				bool uninitialize() override;
 				bool processInput(const size_t index) override;
 				bool process() override;
-
+				
+				// write handler
+				void handler(const boost::system::error_code& error, std::size_t bytes_transferred);
+				
 				// As we do with any class in openvibe, we use the macro below to associate this box to an unique identifier. 
 				// The inheritance information is also made available, as we provide the superclass Toolkit::TBoxAlgorithm < IBoxAlgorithm >
 				_IsDerivedFromClass_Final_(Toolkit::TBoxAlgorithm<IBoxAlgorithm>, OVP_ClassId_BoxAlgorithm_TactiloController)