diff --git a/manual/manual-api/mainReceiver.cpp b/manual/manual-api/mainReceiver.cpp
index 25924e808..ac0eb2233 100644
--- a/manual/manual-api/mainReceiver.cpp
+++ b/manual/manual-api/mainReceiver.cpp
@@ -103,12 +103,12 @@ void AcquisitionFinished(uint64_t frames, void*p){
  * @param detType detector type see :: detectorType
  * @param version version of standard header (structure format)
  * @param datapointer pointer to data
- * @param datasize data size in bytes
+ * @param datasize data size in bytes. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
  * @param p pointer to object
  */
 void GetData(uint64_t frameNumber, uint32_t expLength, uint32_t packetNumber, uint64_t bunchId, uint64_t timestamp,
 		uint16_t modId, uint16_t xCoord, uint16_t yCoord, uint16_t zCoord, uint32_t debug, uint16_t roundRNumber, uint8_t detType, uint8_t version,
-		char* datapointer, uint32_t datasize, void* p){
+		char* datapointer, uint32_t* datasize, void* p){
 
 	PRINT_IN_COLOR (modId?modId:xCoord,
 			"#### %d GetData: ####\n"
@@ -117,7 +117,8 @@ void GetData(uint64_t frameNumber, uint32_t expLength, uint32_t packetNumber, ui
 			"version: %u\t\tfirstbytedata: 0x%x\t\tdatsize: %u\n\n",
 			xCoord, frameNumber, expLength, packetNumber, bunchId, timestamp, modId,
 			xCoord, yCoord, zCoord, debug, roundRNumber, detType, version,
-			((uint8_t)(*((uint8_t*)(datapointer)))), datasize);
+			((uint8_t)(*((uint8_t*)(datapointer)))), *datasize);
+	*datasize = 26000;
 }
 
 
diff --git a/slsReceiverSoftware/include/DataProcessor.h b/slsReceiverSoftware/include/DataProcessor.h
index 4fd7654fd..1636b203b 100644
--- a/slsReceiverSoftware/include/DataProcessor.h
+++ b/slsReceiverSoftware/include/DataProcessor.h
@@ -33,12 +33,14 @@ class DataProcessor : private virtual slsReceiverDefs, public ThreadObject {
 	 * @param freq pointer to streaming frequency
 	 * @param timer pointer to timer if streaming frequency is random
 	 * @param dataReadycb pointer to data ready call back function
-	 * @param pDataReadycb pointer to arguments of data ready call back function
+	 * @param pDataReadycb pointer to arguments of data ready call back function. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
 	 */
 	DataProcessor(Fifo*& f, fileFormat* ftype, bool fwenable, bool* dsEnable, bool* gpEnable, uint32_t* dr,
 						uint32_t* freq, uint32_t* timer,
-						void (*dataReadycb)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-								char*, uint32_t, void*),
+						void (*dataReadycb)(uint64_t, uint32_t, uint32_t, uint64_t,
+						        uint64_t, uint16_t, uint16_t, uint16_t, uint16_t,
+						        uint32_t, uint16_t, uint8_t, uint8_t,
+								char*, uint32_t*, void*),
 						void *pDataReadycb);
 
 	/**
@@ -393,10 +395,11 @@ class DataProcessor : private virtual slsReceiverDefs, public ThreadObject {
 	 * detType is the detector type see :: detectorType
 	 * version is the version number of this structure format
 	 * dataPointer is the pointer to the data
-	 * dataSize in bytes is the size of the data in bytes
+	 * dataSize in bytes is the size of the data in bytes. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
 	 */
-	void (*rawDataReadyCallBack)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-			char*, uint32_t, void*);
+	void (*rawDataReadyCallBack)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t,
+	        uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
+			char*, uint32_t*, void*);
 	void *pRawDataReady;
 
 
diff --git a/slsReceiverSoftware/include/DataStreamer.h b/slsReceiverSoftware/include/DataStreamer.h
index fb66aeb9c..a08183a1e 100644
--- a/slsReceiverSoftware/include/DataStreamer.h
+++ b/slsReceiverSoftware/include/DataStreamer.h
@@ -166,12 +166,13 @@ class DataStreamer : private virtual slsReceiverDefs, public ThreadObject {
 	/**
 	 * Create and send Json Header
 	 * @param header header of image
+	 * @param size data size (could have been modified in call back)
 	 * @param nx number of pixels in x dim
 	 * @param ny number of pixels in y dim
 	 * @param dummy true if its a dummy header
 	 * @returns 0 if error, else 1
 	 */
-	int SendHeader(sls_detector_header* header, uint32_t nx = 0, uint32_t ny = 0, bool dummy = true);
+	int SendHeader(sls_detector_header* header, uint32_t size = 0, uint32_t nx = 0, uint32_t ny = 0, bool dummy = true);
 
 	/** type of thread */
 	static const std::string TypeName;
diff --git a/slsReceiverSoftware/include/UDPBaseImplementation.h b/slsReceiverSoftware/include/UDPBaseImplementation.h
index ca1e6acdf..5babfc50c 100644
--- a/slsReceiverSoftware/include/UDPBaseImplementation.h
+++ b/slsReceiverSoftware/include/UDPBaseImplementation.h
@@ -600,10 +600,12 @@ class UDPBaseImplementation : protected virtual slsReceiverDefs, public UDPInter
 	 * detType is the detector type see :: detectorType
 	 * version is the version number of this structure format
 	 * dataPointer is the pointer to the data
-	 * dataSize in bytes is the size of the data in bytes
+	 * dataSize in bytes is the size of the data in bytes. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
 	 */
-	void registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-			char*, uint32_t, void*),void *arg);
+	void registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t,
+	        uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t,
+	        uint16_t, uint8_t, uint8_t,
+			char*, uint32_t*, void*),void *arg);
 
 
 
@@ -736,10 +738,11 @@ class UDPBaseImplementation : protected virtual slsReceiverDefs, public UDPInter
 	 * detType is the detector type see :: detectorType
 	 * version is the version number of this structure format
 	 * dataPointer is the pointer to the data
-	 * dataSize in bytes is the size of the data in bytes
+	 * dataSize in bytes is the size of the data in bytes. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
 	 */
-	void (*rawDataReadyCallBack)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-			char*, uint32_t, void*);
+	void (*rawDataReadyCallBack)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t,
+	        uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
+			char*, uint32_t*, void*);
 	void *pRawDataReady;
 
 
diff --git a/slsReceiverSoftware/include/UDPInterface.h b/slsReceiverSoftware/include/UDPInterface.h
index 0af8edbe1..35e756587 100644
--- a/slsReceiverSoftware/include/UDPInterface.h
+++ b/slsReceiverSoftware/include/UDPInterface.h
@@ -689,10 +689,10 @@ class UDPInterface {
 	 * detType is the detector type see :: detectorType
 	 * version is the version number of this structure format
 	 * dataPointer is the pointer to the data
-	 * dataSize in bytes is the size of the data in bytes
+	 * dataSize in bytes is the size of the data in bytes. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
 	 */
 	virtual void registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-			char*, uint32_t, void*),void *arg) = 0;
+			char*, uint32_t*, void*),void *arg) = 0;
 
 
  protected:
diff --git a/slsReceiverSoftware/include/ZmqSocket.h b/slsReceiverSoftware/include/ZmqSocket.h
index dd260dffb..8fc063670 100644
--- a/slsReceiverSoftware/include/ZmqSocket.h
+++ b/slsReceiverSoftware/include/ZmqSocket.h
@@ -24,6 +24,7 @@ using namespace rapidjson;
 #define MAX_STR_LENGTH 1000
 
 //#define ZMQ_DETAIL
+#define ROIVERBOSITY
 
 class ZmqSocket {
 
@@ -426,7 +427,15 @@ public:
 			memcpy(buf, (char*)zmq_msg_data(&message), size);
 		}
 
-		//incorrect size
+		//incorrect size (smaller)
+        else if (length < size){
+#ifdef ROIVERBOSITY
+            cprintf(RED,"Error: Received smaller packet size %d for socket %d\n", length, index);
+#endif
+            memcpy(buf, (char*)zmq_msg_data(&message), length);
+            memset(buf+length,0xFF,size-length);
+        }
+        //incorrect size (larger)
 		else {
 			cprintf(RED,"Error: Received weird packet size %d for socket %d\n", length, index);
 			memset(buf,0xFF,size);
diff --git a/slsReceiverSoftware/include/slsReceiver.h b/slsReceiverSoftware/include/slsReceiver.h
index 348d90e8e..69155ad76 100644
--- a/slsReceiverSoftware/include/slsReceiver.h
+++ b/slsReceiverSoftware/include/slsReceiver.h
@@ -91,10 +91,12 @@ class slsReceiver : private virtual slsReceiverDefs {
 	 * detType is the detector type see :: detectorType
 	 * version is the version number of this structure format
 	 * dataPointer is the pointer to the data
-	 * dataSize in bytes is the size of the data in bytes
+	 * dataSize in bytes is the size of the data in bytes. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
 	 */
-	void registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-			char*, uint32_t, void*),void *arg);
+	void registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t,
+	        uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t,
+	        uint16_t, uint8_t, uint8_t,
+			char*, uint32_t*, void*),void *arg);
 
 
 
diff --git a/slsReceiverSoftware/include/slsReceiverTCPIPInterface.h b/slsReceiverSoftware/include/slsReceiverTCPIPInterface.h
index 83e6198db..e75253f14 100644
--- a/slsReceiverSoftware/include/slsReceiverTCPIPInterface.h
+++ b/slsReceiverSoftware/include/slsReceiverTCPIPInterface.h
@@ -95,8 +95,10 @@ class slsReceiverTCPIPInterface : private virtual slsReceiverDefs {
 	 * dataPointer is the pointer to the data
 	 * dataSize in bytes is the size of the data in bytes
 	 */
-	void registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-			char*, uint32_t, void*),void *arg);
+	void registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t,
+	        uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t,
+	        uint16_t, uint8_t, uint8_t,
+			char*, uint32_t*, void*),void *arg);
 
  private:
 
@@ -344,10 +346,11 @@ class slsReceiverTCPIPInterface : private virtual slsReceiverDefs {
 	 * detType is the detector type see :: detectorType
 	 * version is the version number of this structure format
 	 * dataPointer is the pointer to the data
-	 * dataSize in bytes is the size of the data in bytes
+	 * dataSize in bytes is the size of the data in bytes. To write/stream a smaller size of processed data, change this value (only smaller value is allowed).
 	 */
-	void (*rawDataReadyCallBack)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-			char*, uint32_t, void*);
+	void (*rawDataReadyCallBack)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t,
+	        uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
+			char*, uint32_t*, void*);
 	void *pRawDataReady;
 
 
diff --git a/slsReceiverSoftware/include/slsReceiverUsers.h b/slsReceiverSoftware/include/slsReceiverUsers.h
index c2dd0bc0d..8035d33b4 100644
--- a/slsReceiverSoftware/include/slsReceiverUsers.h
+++ b/slsReceiverSoftware/include/slsReceiverUsers.h
@@ -69,7 +69,7 @@ public:
 	 */
 	void registerCallBackRawDataReady(void (*func)(uint64_t frameNumber, uint32_t expLength, uint32_t packetNumber, uint64_t bunchId, uint64_t timestamp,
 			uint16_t modId, uint16_t xCoord, uint16_t yCoord, uint16_t zCoord, uint32_t debug, uint16_t roundRNumber, uint8_t detType, uint8_t version,
-			char* datapointer, uint32_t datasize, void*),void *arg);
+			char* datapointer, uint32_t* datasize, void*),void *arg);
 	
 	//receiver object
 	slsReceiver* receiver;
diff --git a/slsReceiverSoftware/src/DataProcessor.cpp b/slsReceiverSoftware/src/DataProcessor.cpp
index e2dfc9d8a..d78c8bc48 100644
--- a/slsReceiverSoftware/src/DataProcessor.cpp
+++ b/slsReceiverSoftware/src/DataProcessor.cpp
@@ -35,8 +35,9 @@ bool DataProcessor::SilentMode(false);
 
 DataProcessor::DataProcessor(Fifo*& f, fileFormat* ftype, bool fwenable, bool* dsEnable, bool* gpEnable, uint32_t* dr,
 		uint32_t* freq, uint32_t* timer,
-		void (*dataReadycb)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-				char*, uint32_t, void*),
+		void (*dataReadycb)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t,
+		        uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
+				char*, uint32_t*, void*),
 		void *pDataReadycb) :
 
 		ThreadObject(NumberofDataProcessors),
@@ -316,7 +317,7 @@ void DataProcessor::ThreadExecution() {
 		return;
 	}
 
-	ProcessAnImage(buffer + FIFO_HEADER_NUMBYTES);
+	ProcessAnImage(buffer);
 
 	//stream (if time/freq to stream) or free
 	if (*dataStreamEnable && SendToStreamer())
@@ -348,7 +349,7 @@ void DataProcessor::StopProcessing(char* buf) {
 /** buf includes only the standard header */
 void DataProcessor::ProcessAnImage(char* buf) {
 
-	sls_detector_header* header = (sls_detector_header*) (buf);
+	sls_detector_header* header = (sls_detector_header*) (buf + FIFO_HEADER_NUMBYTES);
 	uint64_t fnum = header->frameNumber;
 	currentFrameIndex = fnum;
 	uint32_t nump = header->packetNumber;
@@ -381,7 +382,7 @@ void DataProcessor::ProcessAnImage(char* buf) {
 	}
 
 	if (*gapPixelsEnable && (*dynamicRange!=4))
-		InsertGapPixels(buf + sizeof(sls_detector_header), *dynamicRange);
+		InsertGapPixels(buf + FIFO_HEADER_NUMBYTES + sizeof(sls_detector_header), *dynamicRange);
 
 	// x coord is 0 for detector in pos [0,0,0]
 	if (xcoordin1D) {
@@ -409,14 +410,14 @@ void DataProcessor::ProcessAnImage(char* buf) {
 				header->roundRNumber,
 				header->detType,
 				header->version,
-				buf + sizeof(sls_detector_header),
-				generalData->imageSize,
+				buf + FIFO_HEADER_NUMBYTES + sizeof(sls_detector_header),
+				(uint32_t*)buf,
 				pRawDataReady);
 	}
 
 
 	if (file)
-		file->WriteToFile(buf, sizeof(sls_detector_header) + generalData->imageSize, fnum-firstMeasurementIndex, nump);
+		file->WriteToFile(buf + FIFO_HEADER_NUMBYTES, sizeof(sls_detector_header) + (uint32_t)(*((uint32_t*)buf)), fnum-firstMeasurementIndex, nump);
 
 
 
diff --git a/slsReceiverSoftware/src/DataStreamer.cpp b/slsReceiverSoftware/src/DataStreamer.cpp
index 8946c6e40..3dfced933 100644
--- a/slsReceiverSoftware/src/DataStreamer.cpp
+++ b/slsReceiverSoftware/src/DataStreamer.cpp
@@ -200,7 +200,7 @@ void DataStreamer::ThreadExecution() {
 		return;
 	}
 
-	ProcessAnImage(buffer + FIFO_HEADER_NUMBYTES);
+	ProcessAnImage(buffer);
 
 	//free
 	fifo->FreeAddress(buffer);
@@ -216,7 +216,7 @@ void DataStreamer::StopProcessing(char* buf) {
 #endif
 	sls_detector_header* header = (sls_detector_header*) (buf);
 	//send dummy header and data
-	if (!SendHeader(header, 0, 0, true))
+	if (!SendHeader(header, 0, 0, 0, true))
 		cprintf(RED,"Error: Could not send zmq dummy header for streamer %d\n", index);
 
 	fifo->FreeAddress(buf);
@@ -229,7 +229,7 @@ void DataStreamer::StopProcessing(char* buf) {
 /** buf includes only the standard header */
 void DataStreamer::ProcessAnImage(char* buf) {
 
-	sls_detector_header* header = (sls_detector_header*) (buf);
+	sls_detector_header* header = (sls_detector_header*) (buf + FIFO_HEADER_NUMBYTES);
 	uint64_t fnum = header->frameNumber;
 #ifdef VERBOSE
 	cprintf(MAGENTA,"DataStreamer %d: fnum:%lu\n", index,fnum);
@@ -245,11 +245,11 @@ void DataStreamer::ProcessAnImage(char* buf) {
 	//shortframe gotthard
 	if (completeBuffer) {
 
-		if (!SendHeader(header, generalData->nPixelsXComplete, generalData->nPixelsYComplete, false))
+		if (!SendHeader(header, (uint32_t)(*((uint32_t*)buf)), generalData->nPixelsXComplete, generalData->nPixelsYComplete, false))
 			cprintf(RED,"Error: Could not send zmq header for fnum %lld and streamer %d\n",
 					(long long int) fnum, index);
 
-		memcpy(completeBuffer + ((generalData->imageSize)**shortFrameEnable), buf + sizeof(sls_detector_header), generalData->imageSize);
+		memcpy(completeBuffer + ((generalData->imageSize)**shortFrameEnable), buf + FIFO_HEADER_NUMBYTES + sizeof(sls_detector_header), (uint32_t)(*((uint32_t*)buf)) ); // new size possibly from callback
 		if (!zmqSocket->SendData(completeBuffer, generalData->imageSizeComplete))
 			cprintf(RED,"Error: Could not send zmq data for fnum %lld and streamer %d\n",
 					(long long int) fnum, index);
@@ -259,11 +259,11 @@ void DataStreamer::ProcessAnImage(char* buf) {
 	//normal
 	else {
 
-		if (!SendHeader(header, generalData->nPixelsX, generalData->nPixelsY, false))
+		if (!SendHeader(header, (uint32_t)(*((uint32_t*)buf)), generalData->nPixelsX, generalData->nPixelsY, false)) // new size possibly from callback
 			cprintf(RED,"Error: Could not send zmq header for fnum %lld and streamer %d\n",
 					(long long int) fnum, index);
 
-		if (!zmqSocket->SendData(buf + sizeof(sls_detector_header), generalData->imageSize))
+		if (!zmqSocket->SendData(buf + FIFO_HEADER_NUMBYTES + sizeof(sls_detector_header), (uint32_t)(*((uint32_t*)buf)) )) // new size possibly from callback
 			cprintf(RED,"Error: Could not send zmq data for fnum %lld and streamer %d\n",
 					(long long int) fnum, index);
 	}
@@ -271,7 +271,7 @@ void DataStreamer::ProcessAnImage(char* buf) {
 
 
 
-int DataStreamer::SendHeader(sls_detector_header* header, uint32_t nx, uint32_t ny, bool dummy) {
+int DataStreamer::SendHeader(sls_detector_header* header, uint32_t size, uint32_t nx, uint32_t ny, bool dummy) {
 
 	if (dummy)
 		return  zmqSocket->SendHeaderData(index, dummy,SLS_DETECTOR_JSON_HEADER_VERSION);
@@ -280,7 +280,7 @@ int DataStreamer::SendHeader(sls_detector_header* header, uint32_t nx, uint32_t
 	uint64_t acquisitionIndex = header->frameNumber - firstAcquisitionIndex;
 
 	return zmqSocket->SendHeaderData(index, dummy, SLS_DETECTOR_JSON_HEADER_VERSION, *dynamicRange, *fileIndex,
-			nx, ny,generalData->imageSize,
+			nx, ny, size,
 			acquisitionIndex, frameIndex, fileNametoStream,
 			header->frameNumber, header->expLength, header->packetNumber, header->bunchId, header->timestamp,
 			header->modId, header->xCoord, header->yCoord, header->zCoord,
diff --git a/slsReceiverSoftware/src/UDPBaseImplementation.cpp b/slsReceiverSoftware/src/UDPBaseImplementation.cpp
index 4ac209004..64996cb74 100644
--- a/slsReceiverSoftware/src/UDPBaseImplementation.cpp
+++ b/slsReceiverSoftware/src/UDPBaseImplementation.cpp
@@ -614,8 +614,10 @@ void UDPBaseImplementation::registerCallBackAcquisitionFinished(void (*func)(uin
 	pAcquisitionFinished=arg;
 }
 
-void UDPBaseImplementation::registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-		char*, uint32_t, void*),void *arg){
+void UDPBaseImplementation::registerCallBackRawDataReady(void (*func)(uint64_t,
+        uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t,
+        uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
+		char*, uint32_t*, void*),void *arg){
 	rawDataReadyCallBack=func;
 	pRawDataReady=arg;
 }
diff --git a/slsReceiverSoftware/src/main.cpp b/slsReceiverSoftware/src/main.cpp
index 0086df416..91c22db9a 100644
--- a/slsReceiverSoftware/src/main.cpp
+++ b/slsReceiverSoftware/src/main.cpp
@@ -42,7 +42,7 @@ void AcquisitionFinished(uint64_t frames, void*p){
 
 void GetData(uint64_t frameNumber, uint32_t expLength, uint32_t packetNumber, uint64_t bunchId, uint64_t timestamp,
 		uint16_t modId, uint16_t xCoord, uint16_t yCoord, uint16_t zCoord, uint32_t debug, uint16_t roundRNumber, uint8_t detType, uint8_t version,
-		char* datapointer, uint32_t datasize, void* p){
+		char* datapointer, uint32_t* datasize, void* p){
 
 	PRINT_IN_COLOR (xCoord,
 			"#### %d GetData: ####\n"
@@ -51,7 +51,7 @@ void GetData(uint64_t frameNumber, uint32_t expLength, uint32_t packetNumber, ui
 			"version: %u\t\tfirstbytedata: 0x%x\t\tdatsize: %u\n\n",
 			xCoord, frameNumber, expLength, packetNumber, bunchId, timestamp, modId,
 			xCoord, yCoord, zCoord, debug, roundRNumber, detType, version,
-			((uint8_t)(*((uint8_t*)(datapointer)))), datasize);
+			((uint8_t)(*((uint8_t*)(datapointer)))), *datasize);
 
 }
 */
diff --git a/slsReceiverSoftware/src/slsReceiver.cpp b/slsReceiverSoftware/src/slsReceiver.cpp
index baae6b1c8..9e54c3a45 100644
--- a/slsReceiverSoftware/src/slsReceiver.cpp
+++ b/slsReceiverSoftware/src/slsReceiver.cpp
@@ -150,8 +150,10 @@ void slsReceiver::registerCallBackAcquisitionFinished(void (*func)(uint64_t, voi
 }
 
 
-void slsReceiver::registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-		char*, uint32_t, void*),void *arg){
+void slsReceiver::registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t,
+        uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t,
+        uint32_t, uint16_t, uint8_t, uint8_t,
+		char*, uint32_t*, void*),void *arg){
 	//tcpipInterface
 	if(udp_interface)
 		udp_interface->registerCallBackRawDataReady(func,arg);
diff --git a/slsReceiverSoftware/src/slsReceiverTCPIPInterface.cpp b/slsReceiverSoftware/src/slsReceiverTCPIPInterface.cpp
index 22c123ce7..9701e983f 100644
--- a/slsReceiverSoftware/src/slsReceiverTCPIPInterface.cpp
+++ b/slsReceiverSoftware/src/slsReceiverTCPIPInterface.cpp
@@ -170,8 +170,10 @@ void slsReceiverTCPIPInterface::registerCallBackAcquisitionFinished(void (*func)
 	pAcquisitionFinished=arg;
 }
 
-void slsReceiverTCPIPInterface::registerCallBackRawDataReady(void (*func)(uint64_t, uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t, uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
-		char*, uint32_t, void*),void *arg){
+void slsReceiverTCPIPInterface::registerCallBackRawDataReady(void (*func)(uint64_t,
+        uint32_t, uint32_t, uint64_t, uint64_t, uint16_t, uint16_t, uint16_t,
+        uint16_t, uint32_t, uint16_t, uint8_t, uint8_t,
+		char*, uint32_t*, void*),void *arg){
 	rawDataReadyCallBack=func;
 	pRawDataReady=arg;
 }
diff --git a/slsReceiverSoftware/src/slsReceiverUsers.cpp b/slsReceiverSoftware/src/slsReceiverUsers.cpp
index bab16867f..1ce7de26b 100644
--- a/slsReceiverSoftware/src/slsReceiverUsers.cpp
+++ b/slsReceiverSoftware/src/slsReceiverUsers.cpp
@@ -31,7 +31,7 @@ void slsReceiverUsers::registerCallBackAcquisitionFinished(void (*func)(uint64_t
 	
 void slsReceiverUsers::registerCallBackRawDataReady(void (*func)(uint64_t frameNumber, uint32_t expLength, uint32_t packetNumber, uint64_t bunchId, uint64_t timestamp,
 		uint16_t modId, uint16_t xCoord, uint16_t yCoord, uint16_t zCoord, uint32_t debug, uint16_t roundRNumber, uint8_t detType, uint8_t version,
-		char* datapointer, uint32_t datasize, void*), void *arg){
+		char* datapointer, uint32_t* datasize, void*), void *arg){
 	receiver->registerCallBackRawDataReady(func,arg);
 }