try an other way to create the memory reference point

knxPython/VERSION

@@ -1 +1 @@
-0.1.5
+0.1.6

knxPython/setup.py

@@ -78,4 +78,4 @@ setup(
     cmdclass=dict(build_ext=CMakeBuild),
     url="https://github.com/thelsing/knx",
     zip_safe=False
-)
+)

src/knx/platform.cpp

@@ -11,8 +11,8 @@ uint8_t* Platform::memoryReference()
 uint8_t* Platform::allocMemory(size_t size)
 {
     uint8_t* address =  (uint8_t*)malloc(size);
-    if (_memoryReference == 0)
-        _memoryReference = address;
+//    if (_memoryReference == 0 || address < _memoryReference)
+//        _memoryReference = address;
     
     return address;
 }
@@ -21,3 +21,11 @@ void Platform::freeMemory(uint8_t* ptr)
 {
     free(ptr);
 }
+
+
+Platform::Platform()
+{
+    // allocate memory to have a memory reference
+    _memoryReference = (uint8_t*)malloc(1);
+    free(_memoryReference);
+}

src/knx/platform.h

@@ -6,9 +6,10 @@
 
 class Platform
 {
-public:
+  public:
+    Platform();
     virtual uint32_t currentIpAddress() = 0;
-    virtual uint32_t currentSubnetMask()  = 0;
+    virtual uint32_t currentSubnetMask() = 0;
     virtual uint32_t currentDefaultGateway() = 0;
     virtual void macAddress(uint8_t* data) = 0;
 
@@ -16,26 +17,27 @@ public:
     virtual void restart() = 0;
     virtual void fatalError() = 0;
     virtual void mdelay(uint32_t millis) = 0;
-    
+
     virtual void setupMultiCast(uint32_t addr, uint16_t port) = 0;
     virtual void closeMultiCast() = 0;
     virtual bool sendBytes(uint8_t* buffer, uint16_t len) = 0;
     virtual int readBytes(uint8_t* buffer, uint16_t maxLen) = 0;
-    
+
     virtual void setupUart() = 0;
     virtual void closeUart() = 0;
     virtual int uartAvailable() = 0;
     virtual size_t writeUart(const uint8_t data) = 0;
-    virtual size_t writeUart(const uint8_t *buffer, size_t size) = 0;
+    virtual size_t writeUart(const uint8_t* buffer, size_t size) = 0;
     virtual int readUart() = 0;
-    virtual size_t readBytesUart(uint8_t *buffer, size_t length) = 0;
-        
+    virtual size_t readBytesUart(uint8_t* buffer, size_t length) = 0;
+
     virtual uint8_t* getEepromBuffer(uint16_t size) = 0;
     virtual void commitToEeprom() = 0;
-    
+
     virtual uint8_t* memoryReference();
     virtual uint8_t* allocMemory(size_t size);
     virtual void freeMemory(uint8_t* ptr);
-protected:
+
+  protected:
     uint8_t* _memoryReference = 0;
 };