diff --git a/aqhome/0BUILD b/aqhome/0BUILD
index 72785e0..4d2918d 100644
--- a/aqhome/0BUILD
+++ b/aqhome/0BUILD
@@ -61,6 +61,7 @@
       ipc
       nodes
       mqtt
+      hexfile
     </subdirs>
 
 
@@ -69,6 +70,7 @@
       aqhipc
       aqhnodes
       aqhmqtt
+      aqhhexfile
     </useTargets>
 
     <libraries>
diff --git a/aqhome/hexfile/0BUILD b/aqhome/hexfile/0BUILD
new file mode 100644
index 0000000..a127ddd
--- /dev/null
+++ b/aqhome/hexfile/0BUILD
@@ -0,0 +1,85 @@
+<?xml?>
+
+<gwbuild>
+
+  <target type="ConvenienceLibrary" name="aqhhexfile" >
+
+    <includes type="c" >
+      $(gwenhywfar_cflags)
+      -I$(topsrcdir)
+      -I$(topbuilddir)
+    </includes>
+  
+    <includes type="tm2" >
+      --include=$(builddir)
+      --include=$(srcdir)
+    </includes>
+
+
+    <define name="BUILDING_AQHOME" />
+
+    <setVar name="local/cflags">$(visibility_cflags)</setVar>
+
+  
+    <setVar name="tm2flags" >
+      --api=AQHOME_API
+    </setVar>
+
+    <setVar name="local/typefiles" >
+    </setVar>
+  
+    <setVar name="local/built_sources" >
+    </setVar>
+  
+    <setVar name="local/built_headers_pub">
+    </setVar>
+  
+  
+    <setVar name="local/built_headers_priv" >
+    </setVar>
+
+
+    <headers dist="false" install="$(pkgincludedir)/hexfile" >
+      $(local/built_headers_pub)
+    </headers>
+  
+  
+    <headers dist="true" install="$(pkgincludedir)/hexfile" >
+      hexfilerecord.h
+      hexfilerecord_p.h
+      hexfile.h
+      hexfile_p.h
+      flashrecord.h
+      flashrecord_p.h
+    </headers>
+
+
+    <headers dist="true" >
+    </headers>
+  
+  
+    <sources>
+      $(local/typefiles)
+
+      hexfile.c
+      hexfilerecord.c
+      flashrecord.c
+    </sources>
+
+
+    <extradist>
+    </extradist>
+
+
+    <useTargets>
+    </useTargets>
+
+    <subdirs>
+    </subdirs>
+
+  
+  
+
+  </target>
+  
+</gwbuild>
diff --git a/aqhome/hexfile/flashrecord.c b/aqhome/hexfile/flashrecord.c
new file mode 100644
index 0000000..2d7469e
--- /dev/null
+++ b/aqhome/hexfile/flashrecord.c
@@ -0,0 +1,215 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+
+
+#include "./flashrecord_p.h"
+
+#include <gwenhywfar/debug.h>
+#include <gwenhywfar/misc.h>
+
+
+
+GWEN_LIST_FUNCTIONS(AQH_FLASHRECORD, AQH_FlashRecord)
+
+
+AQH_HEXFILERECORD *_sampleAdjacentHexfileRecords(AQH_FLASHRECORD *fr, AQH_HEXFILERECORD *hrStart);
+
+
+
+
+
+AQH_FLASHRECORD *AQH_FlashRecord_new()
+{
+  AQH_FLASHRECORD *fr;
+
+  GWEN_NEW_OBJECT(AQH_FLASHRECORD, fr);
+  GWEN_LIST_INIT(AQH_FLASHRECORD, fr);
+  return fr;
+}
+
+
+
+void AQH_FlashRecord_free(AQH_FLASHRECORD *fr)
+{
+  if (fr) {
+    GWEN_LIST_FINI(AQH_FLASHRECORD, fr);
+    if (fr->dataPointer)
+      free(fr->dataPointer);
+    fr->dataPointer=NULL;
+    GWEN_FREE_OBJECT(fr);
+  }
+}
+
+
+
+uint32_t AQH_FlashRecord_GetAddress(const AQH_FLASHRECORD *fr)
+{
+  if (fr)
+    return fr->address;
+  return 0;
+}
+
+
+
+void AQH_FlashRecord_SetAddress(AQH_FLASHRECORD *fr, uint32_t a)
+{
+  if (fr)
+    fr->address=a;
+}
+
+
+
+uint32_t AQH_FlashRecord_GetDataLength(const AQH_FLASHRECORD *fr)
+{
+  if (fr)
+    return fr->dataLength;
+  return 0;
+}
+
+
+
+uint8_t *AQH_FlashRecord_GetDataPointer(const AQH_FLASHRECORD *fr)
+{
+  if (fr)
+    return fr->dataPointer;
+  return NULL;
+}
+
+
+
+void AQH_FlashRecord_DirectlySetData(AQH_FLASHRECORD *fr, uint32_t dataLength, uint8_t *dataPtr)
+{
+  if (fr->dataPointer)
+    free(fr->dataPointer);
+  fr->dataPointer=dataPtr;
+  fr->dataLength=dataLength;
+}
+
+
+
+void AQH_FlashRecord_CopyAndSetData(AQH_FLASHRECORD *fr, uint32_t dataLength, const uint8_t *dataPtr)
+{
+  if (fr) {
+    if (fr->dataPointer)
+      free(fr->dataPointer);
+    if (dataLength) {
+      fr->dataPointer=(uint8_t*) malloc(dataLength);
+      if (fr->dataPointer) {
+        if (dataPtr)
+          memmove(fr->dataPointer, dataPtr, dataLength);
+        else
+          memset(fr->dataPointer, 0, dataLength);
+      }
+      else {
+        fr->dataPointer=NULL;
+        fr->dataLength=0;
+      }
+    }
+    else {
+      fr->dataPointer=NULL;
+      fr->dataLength=0;
+    }
+  }
+}
+
+
+
+AQH_FLASHRECORD_LIST *AQH_FlashRecord_fromHexfileRecords(AQH_HEXFILERECORD_LIST *hexFileRecordList)
+{
+  AQH_FLASHRECORD_LIST *flashRecordList;
+  AQH_HEXFILERECORD *hr;
+  uint32_t currentOffset=0;
+
+  flashRecordList=AQH_FlashRecord_List_new();
+  hr=AQH_HexfileRecord_List_First(hexFileRecordList);
+  while(hr) {
+    uint8_t t;
+
+    t=AQH_HexfileRecord_GetRecordType(hr);
+    if (t==AQH_HEXFILERECORD_TYPE_DATA) {
+      AQH_FLASHRECORD *fr;
+
+      fr=AQH_FlashRecord_new();
+      AQH_FlashRecord_SetAddress(fr, currentOffset+AQH_HexfileRecord_GetAddress(hr));
+      hr=_sampleAdjacentHexfileRecords(fr, hr);
+      AQH_FlashRecord_List_Add(fr, flashRecordList);
+    }
+    else {
+      if (t==AQH_HEXFILERECORD_TYPE_EXTSEG) {
+        const uint8_t *ptr;
+
+        if (AQH_HexfileRecord_GetByteCount(hr)<2) {
+          DBG_ERROR(AQH_LOGDOMAIN, "Invalid EXTSEG record (02) in file (too few data bytes)");
+          AQH_FlashRecord_List_free(flashRecordList);
+          return NULL;
+        }
+        ptr=AQH_HexfileRecord_GetDataPointer(hr);
+        currentOffset=((ptr[0]<<8)+ptr[1])<<4;
+      }
+      else if (t==AQH_HEXFILERECORD_TYPE_EOF) {
+        break;
+      }
+
+      hr=AQH_HexfileRecord_List_Next(hr);
+    }
+  } /* while */
+
+  if (AQH_FlashRecord_List_GetCount(flashRecordList)<1) {
+    AQH_FlashRecord_List_free(flashRecordList);
+    return NULL;
+  }
+  return flashRecordList;
+}
+
+
+
+AQH_HEXFILERECORD *_sampleAdjacentHexfileRecords(AQH_FLASHRECORD *fr, AQH_HEXFILERECORD *hrStart)
+{
+  AQH_HEXFILERECORD *hrNext;
+  AQH_HEXFILERECORD *hr;
+  uint32_t len=0;
+
+  hrNext=AQH_HexfileRecord_List_FindNonAdjacentDataRecord(hrStart);
+  /* sample number of contiguous bytes */
+  hr=hrStart;
+  while(hr && hr!=hrNext) {
+    len+=AQH_HexfileRecord_GetByteCount(hr);
+    hr=AQH_HexfileRecord_List_Next(hr);
+  }
+
+  if (len) {
+    uint8_t *ptr;
+    uint32_t offs=0;
+
+    ptr=(uint8_t*) malloc(len);
+    hr=hrStart;
+    while(hr && hr!=hrNext) {
+      memmove(ptr+offs, AQH_HexfileRecord_GetDataPointer(hr), AQH_HexfileRecord_GetByteCount(hr));
+      offs+=AQH_HexfileRecord_GetByteCount(hr);
+      hr=AQH_HexfileRecord_List_Next(hr);
+    }
+    AQH_FlashRecord_DirectlySetData(fr, len, ptr);
+  }
+
+  return hrNext;
+}
+
+
+
+
+
+
+
+
+
+
diff --git a/aqhome/hexfile/flashrecord.h b/aqhome/hexfile/flashrecord.h
new file mode 100644
index 0000000..1d485a4
--- /dev/null
+++ b/aqhome/hexfile/flashrecord.h
@@ -0,0 +1,42 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_FLASHRECORD_H
+#define AQH_FLASHRECORD_H
+
+
+#include <aqhome/api.h>
+#include <aqhome/hexfile/hexfilerecord.h>
+
+#include <gwenhywfar/list.h>
+
+
+typedef struct AQH_FLASHRECORD AQH_FLASHRECORD;
+GWEN_LIST_FUNCTION_LIB_DEFS(AQH_FLASHRECORD, AQH_FlashRecord, AQHOME_API)
+
+
+AQHOME_API AQH_FLASHRECORD *AQH_FlashRecord_new();
+AQHOME_API AQH_FLASHRECORD_LIST *AQH_FlashRecord_fromHexfileRecords(AQH_HEXFILERECORD_LIST *hexFileRecordList);
+
+AQHOME_API void AQH_FlashRecord_free(AQH_FLASHRECORD *fr);
+
+AQHOME_API uint32_t AQH_FlashRecord_GetAddress(const AQH_FLASHRECORD *fr);
+AQHOME_API void AQH_FlashRecord_SetAddress(AQH_FLASHRECORD *fr, uint32_t a);
+
+AQHOME_API uint32_t AQH_FlashRecord_GetDataLength(const AQH_FLASHRECORD *fr);
+AQHOME_API uint8_t *AQH_FlashRecord_GetDataPointer(const AQH_FLASHRECORD *fr);
+AQHOME_API void AQH_FlashRecord_DirectlySetData(AQH_FLASHRECORD *fr, uint32_t dataLength, uint8_t *dataPtr);
+AQHOME_API void AQH_FlashRecord_CopyAndSetData(AQH_FLASHRECORD *fr, uint32_t dataLength, const uint8_t *dataPtr);
+
+
+
+
+
+#endif
+
+
diff --git a/aqhome/hexfile/flashrecord_p.h b/aqhome/hexfile/flashrecord_p.h
new file mode 100644
index 0000000..7ac5fb4
--- /dev/null
+++ b/aqhome/hexfile/flashrecord_p.h
@@ -0,0 +1,30 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_FLASHRECORD_P_H
+#define AQH_FLASHRECORD_P_H
+
+
+#include "./flashrecord.h"
+
+
+
+struct AQH_FLASHRECORD
+{
+  GWEN_LIST_ELEMENT(AQH_FLASHRECORD)
+
+  uint32_t address;
+  uint32_t dataLength;
+  uint8_t *dataPointer;
+};
+
+
+
+#endif
+
+
diff --git a/aqhome/hexfile/hexfile.c b/aqhome/hexfile/hexfile.c
new file mode 100644
index 0000000..20cd902
--- /dev/null
+++ b/aqhome/hexfile/hexfile.c
@@ -0,0 +1,318 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+
+#include "aqhome/hexfile/hexfile_p.h"
+
+#include <gwenhywfar/syncio.h>
+#include <gwenhywfar/debug.h>
+
+#include <string.h>
+
+
+
+
+static const char *_readRecord(AQH_HEXFILERECORD *hr, const char *s);
+static void _writeRecord(AQH_HEXFILERECORD *hr, GWEN_BUFFER *buffer);
+static int _sumValuesForChecksum(const AQH_HEXFILERECORD *hr);
+static int _readWord(const char *s);
+static int _readByte(const char *s);
+static int _readNibble(const char *s);
+
+
+
+
+
+AQH_HEXFILE *AQH_Hexfile_new()
+{
+  AQH_HEXFILE *h;
+
+  GWEN_NEW_OBJECT(AQH_HEXFILE, h);
+  h->recordList=AQH_HexfileRecord_List_new();
+  return h;
+}
+
+
+
+AQH_HEXFILE *AQH_Hexfile_fromString(const char *s)
+{
+  AQH_HEXFILE *h;
+  AQH_HEXFILERECORD_LIST *recordList;
+
+  h=AQH_Hexfile_new();
+  recordList=AQH_Hexfile_GetRecordList(h);
+  while(s && *s) {
+    AQH_HEXFILERECORD *hr;
+    uint8_t rt;
+
+    while(s && *s && *s!=':')
+      s++;
+    hr=AQH_HexfileRecord_new();
+    s=_readRecord(hr, s);
+    if (s==NULL) {
+      AQH_HexfileRecord_free(hr);
+      AQH_Hexfile_free(h);
+      return NULL;
+    }
+    rt=AQH_HexfileRecord_GetRecordType(hr);
+    DBG_INFO(AQH_LOGDOMAIN, "Adding record %02x", rt);
+    AQH_HexfileRecord_List_Add(hr, recordList);
+    if ((rt==AQH_HEXFILERECORD_TYPE_EOF) ||
+        (rt==AQH_HEXFILERECORD_TYPE_DATA && AQH_HexfileRecord_GetByteCount(hr)==0)) {
+      DBG_INFO(AQH_LOGDOMAIN, "End record found");
+      break;
+    }
+  }
+
+  return h;
+}
+
+
+
+AQH_HEXFILE *AQH_Hexfile_fromFile(const char *filename)
+{
+  GWEN_BUFFER *buffer;
+  int rv;
+  AQH_HEXFILE *h;
+
+  buffer=GWEN_Buffer_new(0, 1024, 0, 1);
+  rv=GWEN_SyncIo_Helper_ReadFile(filename, buffer);
+  if (rv<0) {
+    DBG_INFO(AQH_LOGDOMAIN, "here (%d)", rv);
+    GWEN_Buffer_free(buffer);
+    return NULL;
+  }
+
+  h=AQH_Hexfile_fromString(GWEN_Buffer_GetStart(buffer));
+  GWEN_Buffer_free(buffer);
+  if (h==NULL) {
+    DBG_INFO(AQH_LOGDOMAIN, "here");
+  }
+
+  return h;
+}
+
+
+
+void AQH_Hexfile_toBuffer(const AQH_HEXFILE *h, GWEN_BUFFER *buffer)
+{
+  if (h && h->recordList) {
+    AQH_HEXFILERECORD *hr;
+
+    hr=AQH_HexfileRecord_List_First(h->recordList);
+    while(hr) {
+      _writeRecord(hr, buffer);
+      GWEN_Buffer_AppendString(buffer, "\r\n");
+      hr=AQH_HexfileRecord_List_Next(hr);
+    }
+  }
+}
+
+
+
+void AQH_Hexfile_free(AQH_HEXFILE *h)
+{
+  if (h) {
+    AQH_HexfileRecord_List_free(h->recordList);
+    GWEN_FREE_OBJECT(h);
+  }
+}
+
+
+
+AQH_HEXFILERECORD_LIST *AQH_Hexfile_GetRecordList(const AQH_HEXFILE *h)
+{
+  if (h)
+    return h->recordList;
+  return NULL;
+}
+
+
+
+
+
+
+const char *_readRecord(AQH_HEXFILERECORD *hr, const char *s)
+{
+  int v;
+  int dataLen;
+
+  /* find ":" */
+  s=strchr(s, ':');
+  if (s==NULL)
+    return NULL;
+  s++;
+
+  v=_readByte(s);
+  if (v<0)
+    return NULL;
+  AQH_HexfileRecord_SetByteCount(hr, (uint8_t) v);
+  dataLen=v;
+  s+=2;
+
+  v=_readWord(s);
+  if (v<0)
+    return NULL;
+  AQH_HexfileRecord_SetAddress(hr, (uint16_t) v);
+  s+=4;
+
+  v=_readByte(s);
+  if (v<0)
+    return NULL;
+  AQH_HexfileRecord_SetRecordType(hr, (uint8_t) v);
+  s+=2;
+
+  if (dataLen) {
+    uint8_t *ptr;
+    int i;
+
+    ptr=(uint8_t*) malloc(dataLen);
+    if (ptr==NULL) {
+      return NULL;
+    }
+    AQH_HexfileRecord_SetDataPointer(hr, ptr);
+
+    for (i=0; i<dataLen; i++) {
+      v=_readByte(s);
+      if (v<0)
+        return NULL;
+      ptr[i]=(uint8_t) v;
+      s+=2;
+    }
+  }
+
+  /* checksum */
+  v=_readByte(s);
+  if (v<0)
+    return NULL;
+  s+=2;
+
+  v+=_sumValuesForChecksum(hr);
+  if (v & 0xff) {
+    DBG_ERROR(AQH_LOGDOMAIN, "Invalid checksum (%d, %d)", (v & 0xff), -(v & 0xff));
+    return NULL;
+  }
+
+  return s;
+}
+
+
+
+void _writeRecord(AQH_HEXFILERECORD *hr, GWEN_BUFFER *buffer)
+{
+  uint8_t len;
+  int v;
+
+  len=AQH_HexfileRecord_GetByteCount(hr);
+  GWEN_Buffer_AppendArgs(buffer, ":%02X%04X%02X",
+                         AQH_HexfileRecord_GetByteCount(hr),
+                         AQH_HexfileRecord_GetAddress(hr),
+                         AQH_HexfileRecord_GetRecordType(hr));
+  if (len) {
+    const uint8_t *ptr;
+    int i;
+
+    ptr=AQH_HexfileRecord_GetDataPointer(hr);
+    for(i=0; i<len; i++)
+      GWEN_Buffer_AppendArgs(buffer, "%02X", ptr[i]);
+  }
+
+  v=_sumValuesForChecksum(hr);
+  GWEN_Buffer_AppendArgs(buffer, "%02X", (-v) & 0xff);
+}
+
+
+
+int _sumValuesForChecksum(const AQH_HEXFILERECORD *hr)
+{
+  int v;
+  int dataLen;
+
+  dataLen=AQH_HexfileRecord_GetByteCount(hr);
+  v=AQH_HexfileRecord_GetByteCount(hr)+
+    ((AQH_HexfileRecord_GetAddress(hr)>>8) & 0xff)+(AQH_HexfileRecord_GetAddress(hr)  & 0xff)+
+    AQH_HexfileRecord_GetRecordType(hr);
+  if (dataLen) {
+    const uint8_t *ptr;
+    int i;
+
+    ptr=AQH_HexfileRecord_GetDataPointer(hr);
+    for(i=0; i<dataLen; i++)
+      v+=ptr[i];
+  }
+
+  return v;
+}
+
+
+
+
+int _readWord(const char *s)
+{
+  uint16_t result;
+  int b;
+
+  b=_readByte(s);
+  if (b<0)
+    return -1;
+  result=(uint16_t)(b & 0xff);
+  s+=2;
+
+  b=_readByte(s++);
+  if (b<0)
+    return -1;
+  result<<=8;
+  result|=(uint16_t)(b & 0xff);
+  return (int) result;
+}
+
+
+
+int _readByte(const char *s)
+{
+  uint8_t result;
+  int c;
+
+  c=_readNibble(s++);
+  if (c<0)
+    return -1;
+  result=(uint8_t) (c & 0xf);
+  c=_readNibble(s);
+  if (c<0)
+    return -1;
+  result<<=4;
+  result|=(uint8_t) (c & 0xf);
+  return (int) result;
+}
+
+
+
+int _readNibble(const char *s)
+{
+  uint8_t c;
+
+  c=*s;
+  if (c==0)
+    return -1;
+  if (c>='0' && c<='9')
+    c-='0';
+  else if (c>='A' && c<='F')
+    c-='A'-10;
+  else if (c>='a' && c<='f')
+    c-='a'-10;
+  else
+    return -1;
+  return c;
+}
+
+
+
diff --git a/aqhome/hexfile/hexfile.h b/aqhome/hexfile/hexfile.h
new file mode 100644
index 0000000..216c79f
--- /dev/null
+++ b/aqhome/hexfile/hexfile.h
@@ -0,0 +1,41 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_HEXFILE_H
+#define AQH_HEXFILE_H
+
+
+#include <aqhome/api.h>
+#include <aqhome/hexfile/hexfilerecord.h>
+
+#include <gwenhywfar/list.h>
+#include <gwenhywfar/buffer.h>
+
+
+
+typedef struct AQH_HEXFILE AQH_HEXFILE;
+
+
+AQHOME_API AQH_HEXFILE *AQH_Hexfile_new();
+AQHOME_API AQH_HEXFILE *AQH_Hexfile_fromString(const char *s);
+AQHOME_API AQH_HEXFILE *AQH_Hexfile_fromFile(const char *filename);
+
+AQHOME_API void AQH_Hexfile_toBuffer(const AQH_HEXFILE *h, GWEN_BUFFER *buffer);
+
+AQHOME_API void AQH_Hexfile_free(AQH_HEXFILE *h);
+
+AQHOME_API AQH_HEXFILERECORD_LIST *AQH_Hexfile_GetRecordList(const AQH_HEXFILE *h);
+
+
+
+
+
+
+#endif
+
+
diff --git a/aqhome/hexfile/hexfile_p.h b/aqhome/hexfile/hexfile_p.h
new file mode 100644
index 0000000..c2561e9
--- /dev/null
+++ b/aqhome/hexfile/hexfile_p.h
@@ -0,0 +1,27 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_HEXFILE_P_H
+#define AQH_HEXFILE_P_H
+
+
+#include "aqhome/hexfile/hexfile.h"
+
+
+
+struct AQH_HEXFILE {
+  AQH_HEXFILERECORD_LIST *recordList;
+};
+
+
+
+
+
+#endif
+
+
diff --git a/aqhome/hexfile/hexfilerecord.c b/aqhome/hexfile/hexfilerecord.c
new file mode 100644
index 0000000..25c11a1
--- /dev/null
+++ b/aqhome/hexfile/hexfilerecord.c
@@ -0,0 +1,175 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+
+
+#include "./hexfilerecord_p.h"
+
+#include <gwenhywfar/debug.h>
+#include <gwenhywfar/misc.h>
+
+
+
+GWEN_LIST_FUNCTIONS(AQH_HEXFILERECORD, AQH_HexfileRecord)
+
+
+
+
+AQH_HEXFILERECORD *AQH_HexfileRecord_new()
+{
+  AQH_HEXFILERECORD *hr;
+
+  GWEN_NEW_OBJECT(AQH_HEXFILERECORD, hr);
+  GWEN_LIST_INIT(AQH_HEXFILERECORD, hr);
+  return hr;
+}
+
+
+
+void AQH_HexfileRecord_free(AQH_HEXFILERECORD *hr)
+{
+  if (hr) {
+    GWEN_LIST_FINI(AQH_HEXFILERECORD, hr);
+    if (hr->dataPointer)
+      free(hr->dataPointer);
+    GWEN_FREE_OBJECT(hr);
+  }
+}
+
+
+
+uint8_t AQH_HexfileRecord_GetByteCount(const AQH_HEXFILERECORD *hr)
+{
+  if (hr)
+    return hr->byteCount;
+  return 0;
+}
+
+
+
+void AQH_HexfileRecord_SetByteCount(AQH_HEXFILERECORD *hr, uint8_t b)
+{
+  if (hr)
+    hr->byteCount=b;
+}
+
+
+
+uint16_t AQH_HexfileRecord_GetAddress(const AQH_HEXFILERECORD *hr)
+{
+  if (hr)
+    return hr->address;
+  return 0;
+}
+
+
+
+void AQH_HexfileRecord_SetAddress(AQH_HEXFILERECORD *hr, uint16_t a)
+{
+  if (hr)
+    hr->address=a;
+}
+
+
+
+uint8_t AQH_HexfileRecord_GetRecordType(const AQH_HEXFILERECORD *hr)
+{
+  if (hr)
+    return hr->recordType;
+  return 0;
+}
+
+
+
+void AQH_HexfileRecord_SetRecordType(AQH_HEXFILERECORD *hr, uint8_t t)
+{
+  if (hr)
+    hr->recordType=t;
+}
+
+
+
+const uint8_t *AQH_HexfileRecord_GetDataPointer(const AQH_HEXFILERECORD *hr)
+{
+  if (hr)
+    return hr->dataPointer;
+  return NULL;
+}
+
+
+
+void AQH_HexfileRecord_SetDataPointer(AQH_HEXFILERECORD *hr, uint8_t *ptr)
+{
+  if (hr) {
+    if (hr->dataPointer)
+      free(hr->dataPointer);
+    hr->dataPointer=ptr;
+  }
+}
+
+
+
+void AQH_HexfileRecord_SetData(AQH_HEXFILERECORD *hr, const uint8_t *ptr, uint8_t len)
+{
+  if (hr) {
+    if (hr->dataPointer)
+      free(hr->dataPointer);
+    if (ptr && len) {
+      hr->dataPointer=(uint8_t*) malloc(len);
+      if (hr->dataPointer) {
+        memmove(hr->dataPointer, ptr, len);
+        hr->byteCount=len;
+      }
+      else {
+        hr->dataPointer=NULL;
+        hr->byteCount=0;
+      }
+    }
+    else {
+      hr->dataPointer=NULL;
+      hr->byteCount=0;
+    }
+  }
+}
+
+
+
+AQH_HEXFILERECORD *AQH_HexfileRecord_List_FindNonAdjacentDataRecord(AQH_HEXFILERECORD *hr)
+{
+  uint16_t expectedAddr;
+  int cnt=0;
+
+  expectedAddr=AQH_HexfileRecord_GetAddress(hr)+AQH_HexfileRecord_GetByteCount(hr);
+  hr=AQH_HexfileRecord_List_Next(hr);
+  while(hr && AQH_HexfileRecord_GetRecordType(hr)==AQH_HEXFILERECORD_TYPE_DATA) {
+    uint16_t addr;
+
+    addr=AQH_HexfileRecord_GetAddress(hr);
+    if (addr!=expectedAddr)
+      break;
+    expectedAddr=addr+AQH_HexfileRecord_GetByteCount(hr);
+    cnt++;
+    hr=AQH_HexfileRecord_List_Next(hr);
+  }
+
+  DBG_INFO(AQH_LOGDOMAIN, "- num of continuous records: %d", cnt);
+  return hr;
+}
+
+
+
+
+
+
+
+
+
diff --git a/aqhome/hexfile/hexfilerecord.h b/aqhome/hexfile/hexfilerecord.h
new file mode 100644
index 0000000..ba3f8ae
--- /dev/null
+++ b/aqhome/hexfile/hexfilerecord.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_HEXFILERECORD_H
+#define AQH_HEXFILERECORD_H
+
+
+#include <aqhome/api.h>
+
+#include <gwenhywfar/list.h>
+
+
+#define AQH_HEXFILERECORD_TYPE_DATA            0x00
+#define AQH_HEXFILERECORD_TYPE_EOF             0x01
+#define AQH_HEXFILERECORD_TYPE_EXTSEG          0x02
+#define AQH_HEXFILERECORD_TYPE_STARTSEGADDR    0x03
+#define AQH_HEXFILERECORD_TYPE_EXTLINEARADDR   0x04
+#define AQH_HEXFILERECORD_TYPE_STARTLINEARADDR 0x05
+
+
+
+typedef struct AQH_HEXFILERECORD AQH_HEXFILERECORD;
+GWEN_LIST_FUNCTION_LIB_DEFS(AQH_HEXFILERECORD, AQH_HexfileRecord, AQHOME_API)
+
+
+AQHOME_API AQH_HEXFILERECORD *AQH_HexfileRecord_new();
+AQHOME_API void AQH_HexfileRecord_free(AQH_HEXFILERECORD *hr);
+
+
+AQHOME_API uint8_t AQH_HexfileRecord_GetByteCount(const AQH_HEXFILERECORD *hr);
+AQHOME_API void AQH_HexfileRecord_SetByteCount(AQH_HEXFILERECORD *hr, uint8_t b);
+
+AQHOME_API uint16_t AQH_HexfileRecord_GetAddress(const AQH_HEXFILERECORD *hr);
+AQHOME_API void AQH_HexfileRecord_SetAddress(AQH_HEXFILERECORD *hr, uint16_t a);
+
+AQHOME_API uint8_t AQH_HexfileRecord_GetRecordType(const AQH_HEXFILERECORD *hr);
+AQHOME_API void AQH_HexfileRecord_SetRecordType(AQH_HEXFILERECORD *hr, uint8_t t);
+
+AQHOME_API const uint8_t *AQH_HexfileRecord_GetDataPointer(const AQH_HEXFILERECORD *hr);
+AQHOME_API void AQH_HexfileRecord_SetDataPointer(AQH_HEXFILERECORD *hr, uint8_t *ptr);
+
+AQHOME_API void AQH_HexfileRecord_SetData(AQH_HEXFILERECORD *hr, const uint8_t *ptr, uint8_t len);
+
+
+/**
+ * Find the first record whose address is non-contiguous with the given record.
+ * This can be used to reduce the number of data records.
+ * This function stops at the next record whose address is non-continuous or whose type is not 00.
+ *
+ * @return next non-contiguous or non-data record (NULL if none)
+ * @param hr record to start with (i.e. whose successor are checked for continuity)
+ */
+AQHOME_API AQH_HEXFILERECORD *AQH_HexfileRecord_List_FindNonAdjacentDataRecord(AQH_HEXFILERECORD *hr);
+
+
+
+
+#endif
+
+
diff --git a/aqhome/hexfile/hexfilerecord_p.h b/aqhome/hexfile/hexfilerecord_p.h
new file mode 100644
index 0000000..7135cef
--- /dev/null
+++ b/aqhome/hexfile/hexfilerecord_p.h
@@ -0,0 +1,31 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_HEXFILERECORD_P_H
+#define AQH_HEXFILERECORD_P_H
+
+
+#include "./hexfilerecord.h"
+
+
+
+struct AQH_HEXFILERECORD
+{
+  GWEN_LIST_ELEMENT(AQH_HEXFILERECORD)
+
+  uint8_t byteCount;
+  uint16_t address;
+  uint8_t recordType;
+  uint8_t *dataPointer;
+};
+
+
+
+#endif
+
+
diff --git a/aqhome/libtest.c b/aqhome/libtest.c
index 32b7d14..0163cb8 100644
--- a/aqhome/libtest.c
+++ b/aqhome/libtest.c
@@ -19,6 +19,8 @@
 #include "aqhome/mqtt/msg_mqtt_publish.h"
 #include "aqhome/mqtt/msg_mqtt_pubresponse.h"
 #include "aqhome/msgmanager.h"
+#include "aqhome/hexfile/hexfile.h"
+#include "aqhome/hexfile/flashrecord.h"
 
 #include "aqhome/aqhome.h"
 
@@ -342,6 +344,105 @@ int testIpcConnection()
 
 
 
+int testHexfile(int argc, char **argv)
+{
+  const char *inFilename;
+  const char *outFilename;
+  AQH_HEXFILE *h;
+  int rv;
+
+  if (argc<3) {
+    fprintf(stderr, "Missing filenames (in, out)\n");
+    return 1;
+  }
+
+  rv=AQH_Init();
+  if (rv<0) {
+  }
+
+  inFilename=argv[1];
+  outFilename=argv[2];
+  h=AQH_Hexfile_fromFile(inFilename);
+  if (h==NULL) {
+    fprintf(stderr, "Error reading hexfile \"%s\".\n", inFilename);
+    return 2;
+  }
+  else {
+    AQH_HEXFILERECORD_LIST *recordList;
+    GWEN_BUFFER *buffer;
+
+    recordList=AQH_Hexfile_GetRecordList(h);
+    fprintf(stdout, "INTEL Hexfile read with %d records\n", AQH_HexfileRecord_List_GetCount(recordList));
+
+    buffer=GWEN_Buffer_new(0, 1024, 0, 1);
+    AQH_Hexfile_toBuffer(h, buffer);
+    rv=GWEN_SyncIo_Helper_WriteFile(outFilename, (const uint8_t*) GWEN_Buffer_GetStart(buffer), GWEN_Buffer_GetUsedBytes(buffer));
+    GWEN_Buffer_free(buffer);
+    if (rv<0) {
+      fprintf(stderr, "ERROR writing outfile \"%s\": %d", outFilename, rv);
+      AQH_Hexfile_free(h);
+      return 3;
+    }
+    AQH_Hexfile_free(h);
+  }
+
+  return 0;
+}
+
+
+
+int testFlashRecords(int argc, char **argv)
+{
+  const char *inFilename;
+  AQH_HEXFILE *h;
+  int rv;
+
+  if (argc<2) {
+    fprintf(stderr, "Missing filename\n");
+    return 1;
+  }
+
+  rv=AQH_Init();
+  if (rv<0) {
+  }
+
+  inFilename=argv[1];
+  h=AQH_Hexfile_fromFile(inFilename);
+  if (h==NULL) {
+    fprintf(stderr, "Error reading hexfile \"%s\".\n", inFilename);
+    return 2;
+  }
+  else {
+    AQH_HEXFILERECORD_LIST *recordList;
+    AQH_FLASHRECORD_LIST *flashRecordList;
+
+    recordList=AQH_Hexfile_GetRecordList(h);
+    fprintf(stdout, "INTEL Hexfile read with %d records\n", AQH_HexfileRecord_List_GetCount(recordList));
+
+    flashRecordList=AQH_FlashRecord_fromHexfileRecords(recordList);
+    if (flashRecordList==NULL) {
+      fprintf(stderr, "ERROR creating flash record list\n");
+      AQH_Hexfile_free(h);
+      return 3;
+    }
+    else {
+      AQH_FLASHRECORD *fr;
+
+      fprintf(stdout, "Flash record list created with %d records\n", AQH_FlashRecord_List_GetCount(flashRecordList));
+      fr=AQH_FlashRecord_List_First(flashRecordList);
+      while(fr) {
+        fprintf(stdout, "- %08x (%d bytes)\n", AQH_FlashRecord_GetAddress(fr), AQH_FlashRecord_GetDataLength(fr));
+        fr=AQH_FlashRecord_List_Next(fr);
+      }
+    }
+
+    AQH_Hexfile_free(h);
+  }
+
+  return 0;
+}
+
+
 
 
 int main(int argc, char **argv)
@@ -349,7 +450,10 @@ int main(int argc, char **argv)
   //return testEndpoints();
   //return testMsgMqttConnect();
   //return testMqttConnection();
-  return testIpcConnection();
+
+  //return testIpcConnection();
+  //return testHexfile(argc, argv);
+  return testFlashRecords(argc, argv);
 }