diff --git a/src/esp32_platform.cpp b/src/esp32_platform.cpp
index ada8fd3d..a8c985ba 100644
--- a/src/esp32_platform.cpp
+++ b/src/esp32_platform.cpp
@@ -10,17 +10,42 @@
 #define KNX_SERIAL Serial1
 #endif
 
+#ifndef KNX_UART_RX_PIN
+#define KNX_UART_RX_PIN -1
+#endif
+
+#ifndef KNX_UART_TX_PIN
+#define KNX_UART_TX_PIN -1
+#endif
+
 Esp32Platform::Esp32Platform()
 #ifndef KNX_NO_DEFAULT_UART
     : ArduinoPlatform(&KNX_SERIAL)
 #endif
 {
+#ifndef KNX_NO_DEFAULT_UART
+    knxUartPins(KNX_UART_RX_PIN, KNX_UART_TX_PIN);
+#endif
 }
 
 Esp32Platform::Esp32Platform(HardwareSerial* s) : ArduinoPlatform(s)
 {
 }
 
+void Esp32Platform::knxUartPins(int8_t rxPin, int8_t txPin)
+{
+    _rxPin = rxPin;
+    _txPin = txPin;
+}
+
+// ESP specific uart handling with pins
+void Esp32Platform::setupUart()
+{
+    _knxSerial->begin(19200, SERIAL_8E1, _rxPin, _txPin);
+    while (!_knxSerial) 
+        ;
+}
+
 uint32_t Esp32Platform::currentIpAddress()
 {
     return WiFi.localIP();
diff --git a/src/esp32_platform.h b/src/esp32_platform.h
index 0193efe4..318291cb 100644
--- a/src/esp32_platform.h
+++ b/src/esp32_platform.h
@@ -10,6 +10,10 @@ class Esp32Platform : public ArduinoPlatform
     Esp32Platform();
     Esp32Platform(HardwareSerial* s);
 
+    // uart
+    void knxUartPins(int8_t rxPin, int8_t txPin);
+    void setupUart() override;
+
     // ip stuff
     uint32_t currentIpAddress() override;
     uint32_t currentSubnetMask() override;
@@ -36,6 +40,8 @@ class Esp32Platform : public ArduinoPlatform
     void commitToEeprom();
 private:
     WiFiUDP _udp;
+    int8_t _rxPin = -1; 
+    int8_t _txPin = -1;
 };
 
 #endif
diff --git a/src/knx/application_layer.cpp b/src/knx/application_layer.cpp
index 7e9fe346..656be008 100644
--- a/src/knx/application_layer.cpp
+++ b/src/knx/application_layer.cpp
@@ -551,7 +551,7 @@ void ApplicationLayer::systemNetworkParameterReadResponse(Priority priority, Hop
 void ApplicationLayer::domainAddressSerialNumberReadResponse(Priority priority, HopCountType hopType, const SecurityControl &secCtrl, const uint8_t* rfDoA,
                                                              const uint8_t* knxSerialNumber)
 {
-    CemiFrame frame(11); 
+    CemiFrame frame(13); 
     APDU& apdu = frame.apdu();
     apdu.type(DomainAddressSerialNumberResponse);
 
@@ -567,19 +567,19 @@ void ApplicationLayer::domainAddressSerialNumberReadResponse(Priority priority,
 
 //TODO: ApplicationLayer::IndividualAddressSerialNumberWriteRequest()
 //TODO: ApplicationLayer::IndividualAddressSerialNumberReadRequest()
-void ApplicationLayer::IndividualAddressSerialNumberReadResponse(Priority priority, HopCountType hopType, const SecurityControl &secCtrl, const uint8_t* rfDoA,
+void ApplicationLayer::IndividualAddressSerialNumberReadResponse(Priority priority, HopCountType hopType, const SecurityControl &secCtrl, const uint8_t* domainAddress,
                                                                  const uint8_t* knxSerialNumber)
 {
-    CemiFrame frame(13); 
+    CemiFrame frame(11); 
     APDU& apdu = frame.apdu();
     apdu.type(IndividualAddressSerialNumberResponse);
 
     uint8_t* data = apdu.data() + 1;
 
     memcpy(data, knxSerialNumber, 6);
-    memcpy(data + 6, rfDoA, 6);
+    memcpy(data + 6, domainAddress, 2);
 
-     //apdu.printPDU();
+    //apdu.printPDU();
 
     dataBroadcastRequest(AckDontCare, hopType, SystemPriority, apdu, secCtrl);
 }
diff --git a/src/knx/application_layer.h b/src/knx/application_layer.h
index 047befed..eac948af 100644
--- a/src/knx/application_layer.h
+++ b/src/knx/application_layer.h
@@ -158,7 +158,7 @@ class ApplicationLayer
                                             uint8_t* testResult, uint16_t testResultLength);
     void domainAddressSerialNumberReadResponse(Priority priority, HopCountType hopType, const SecurityControl& secCtrl, const uint8_t* rfDoA,
                                                const uint8_t* knxSerialNumber);                                       
-    void IndividualAddressSerialNumberReadResponse(Priority priority, HopCountType hopType, const SecurityControl& secCtrl, const uint8_t* rfDoA,
+    void IndividualAddressSerialNumberReadResponse(Priority priority, HopCountType hopType, const SecurityControl& secCtrl, const uint8_t* domainAddress,
                                                const uint8_t* knxSerialNumber);                                       
 #pragma endregion
 
diff --git a/src/knx/bau07B0.cpp b/src/knx/bau07B0.cpp
index 24057776..7a92028d 100644
--- a/src/knx/bau07B0.cpp
+++ b/src/knx/bau07B0.cpp
@@ -10,7 +10,8 @@ using namespace std;
 
 Bau07B0::Bau07B0(Platform& platform)
     : BauSystemBDevice(platform),
-      _dlLayer(_deviceObj, _netLayer.getInterface(), _platform, (ITpUartCallBacks&) *this)
+      _dlLayer(_deviceObj, _netLayer.getInterface(), _platform, (ITpUartCallBacks&) *this, (DataLinkLayerCallbacks*) this),
+      DataLinkLayerCallbacks()
 #ifdef USE_CEMI_SERVER
     , _cemiServer(*this)
 #endif           
diff --git a/src/knx/bau07B0.h b/src/knx/bau07B0.h
index 5bdbad99..e37df3e4 100644
--- a/src/knx/bau07B0.h
+++ b/src/knx/bau07B0.h
@@ -8,7 +8,7 @@
 #include "cemi_server.h"
 #include "cemi_server_object.h"
 
-class Bau07B0 : public BauSystemBDevice, public ITpUartCallBacks
+class Bau07B0 : public BauSystemBDevice, public ITpUartCallBacks, public DataLinkLayerCallbacks
 {
   public:
     Bau07B0(Platform& platform);
diff --git a/src/knx/bau091A.cpp b/src/knx/bau091A.cpp
index 53db8bb5..6ded1691 100644
--- a/src/knx/bau091A.cpp
+++ b/src/knx/bau091A.cpp
@@ -17,8 +17,9 @@ Bau091A::Bau091A(Platform& platform)
     : BauSystemBCoupler(platform),
       _routerObj(memory(), 0x200, 0x2000),  // the Filtertable of 0x091A IP Routers is fixed at 0x200 and 0x2000 long
       _ipParameters(_deviceObj, platform),
-      _dlLayerPrimary(_deviceObj, _ipParameters, _netLayer.getPrimaryInterface(), _platform),
-      _dlLayerSecondary(_deviceObj, _netLayer.getSecondaryInterface(), platform, (ITpUartCallBacks&) *this)
+      _dlLayerPrimary(_deviceObj, _ipParameters, _netLayer.getPrimaryInterface(), _platform, (DataLinkLayerCallbacks*) this),
+      _dlLayerSecondary(_deviceObj, _netLayer.getSecondaryInterface(), platform, (ITpUartCallBacks&) *this, (DataLinkLayerCallbacks*) this),
+      DataLinkLayerCallbacks()
 #ifdef USE_CEMI_SERVER
       ,
       _cemiServer(*this)
diff --git a/src/knx/bau091A.h b/src/knx/bau091A.h
index 56524e84..a48e1645 100644
--- a/src/knx/bau091A.h
+++ b/src/knx/bau091A.h
@@ -10,7 +10,7 @@
 #include "tpuart_data_link_layer.h"
 #include "cemi_server_object.h"
 
-class Bau091A : public BauSystemBCoupler, public ITpUartCallBacks
+class Bau091A : public BauSystemBCoupler, public ITpUartCallBacks, public DataLinkLayerCallbacks
 {
   public:
     Bau091A(Platform& platform);
diff --git a/src/knx/bau27B0.cpp b/src/knx/bau27B0.cpp
index 9b119f9b..6180539a 100644
--- a/src/knx/bau27B0.cpp
+++ b/src/knx/bau27B0.cpp
@@ -169,10 +169,7 @@ void Bau27B0::domainAddressSerialNumberReadIndication(Priority priority, HopCoun
 
 void Bau27B0::individualAddressSerialNumberReadIndication(Priority priority, HopCountType hopType, const SecurityControl &secCtrl, uint8_t* knxSerialNumber)
 {
-    // If the received serial number matches our serial number
-    // then send a response with the current RF domain address stored in the RF medium object and the serial number
-    if (!memcmp(knxSerialNumber, _deviceObj.propertyData(PID_SERIAL_NUMBER), 6))
-        _appLayer.IndividualAddressSerialNumberReadResponse(priority, hopType, secCtrl, _rfMediumObj.rfDomainAddress(), knxSerialNumber);
+    #pragma warning "individualAddressSerialNumberReadIndication is not available for rf"
 }
 
 void Bau27B0::domainAddressSerialNumberWriteLocalConfirm(Priority priority, HopCountType hopType, const SecurityControl &secCtrl, const uint8_t* rfDoA,
diff --git a/src/knx/bau57B0.cpp b/src/knx/bau57B0.cpp
index c9b3827b..75522aa1 100644
--- a/src/knx/bau57B0.cpp
+++ b/src/knx/bau57B0.cpp
@@ -11,7 +11,8 @@ using namespace std;
 Bau57B0::Bau57B0(Platform& platform)
     : BauSystemBDevice(platform),
       _ipParameters(_deviceObj, platform),
-      _dlLayer(_deviceObj, _ipParameters, _netLayer.getInterface(), _platform)
+      _dlLayer(_deviceObj, _ipParameters, _netLayer.getInterface(), _platform, (DataLinkLayerCallbacks*) this),
+      DataLinkLayerCallbacks()
 #ifdef USE_CEMI_SERVER
       ,
       _cemiServer(*this)
diff --git a/src/knx/bau57B0.h b/src/knx/bau57B0.h
index a381ebb4..f6309f93 100644
--- a/src/knx/bau57B0.h
+++ b/src/knx/bau57B0.h
@@ -8,7 +8,7 @@
 #include "ip_data_link_layer.h"
 #include "cemi_server_object.h"
 
-class Bau57B0 : public BauSystemBDevice
+class Bau57B0 : public BauSystemBDevice, public DataLinkLayerCallbacks
 {
   public:
     Bau57B0(Platform& platform);
diff --git a/src/knx/bau_systemB.cpp b/src/knx/bau_systemB.cpp
index ca89a4a1..895ab577 100644
--- a/src/knx/bau_systemB.cpp
+++ b/src/knx/bau_systemB.cpp
@@ -549,7 +549,7 @@ void BauSystemB::individualAddressSerialNumberReadIndication(Priority priority,
     // An open medium BAU has to override this method and provide a proper domain address.
     if (!memcmp(knxSerialNumber, _deviceObj.propertyData(PID_SERIAL_NUMBER), 6))
     {
-        uint8_t emptyDomainAddress[6] = {0x00};
+        uint8_t emptyDomainAddress[2] = {0x00};
         applicationLayer().IndividualAddressSerialNumberReadResponse(priority, hopType, secCtrl, emptyDomainAddress, knxSerialNumber);
     }
 }
diff --git a/src/knx/data_link_layer.cpp b/src/knx/data_link_layer.cpp
index 7cb72769..e20016e4 100644
--- a/src/knx/data_link_layer.cpp
+++ b/src/knx/data_link_layer.cpp
@@ -6,6 +6,18 @@
 #include "cemi_server.h"
 #include "cemi_frame.h"
 
+
+void DataLinkLayerCallbacks::activity(uint8_t info)
+{
+    if(_activityCallback)
+        _activityCallback(info);
+}
+
+void DataLinkLayerCallbacks::setActivityCallback(ActivityCallback activityCallback)
+{
+    _activityCallback = activityCallback;
+}
+
 DataLinkLayer::DataLinkLayer(DeviceObject& devObj, NetworkLayerEntity& netLayerEntity, Platform& platform) :
     _deviceObject(devObj), _networkLayerEntity(netLayerEntity), _platform(platform)
 {
diff --git a/src/knx/data_link_layer.h b/src/knx/data_link_layer.h
index 151128ec..554c98ce 100644
--- a/src/knx/data_link_layer.h
+++ b/src/knx/data_link_layer.h
@@ -10,6 +10,18 @@
 
 class Platform;
 
+typedef void (*ActivityCallback)(uint8_t info);
+
+class DataLinkLayerCallbacks
+{
+protected:
+    ActivityCallback _activityCallback = nullptr;
+public:
+    virtual ~DataLinkLayerCallbacks() = default;
+    virtual void activity(uint8_t info);
+    virtual void setActivityCallback(ActivityCallback activityCallback);
+};
+
 class DataLinkLayer
 {
   public:
diff --git a/src/knx/ip_data_link_layer.cpp b/src/knx/ip_data_link_layer.cpp
index 9287971f..1b4142c6 100644
--- a/src/knx/ip_data_link_layer.cpp
+++ b/src/knx/ip_data_link_layer.cpp
@@ -33,7 +33,7 @@
 #define MIN_LEN_CEMI 10
 
 IpDataLinkLayer::IpDataLinkLayer(DeviceObject& devObj, IpParameterObject& ipParam,
-    NetworkLayerEntity &netLayerEntity, Platform& platform) : DataLinkLayer(devObj, netLayerEntity, platform), _ipParameters(ipParam)
+    NetworkLayerEntity &netLayerEntity, Platform& platform, DataLinkLayerCallbacks* dllcb) : DataLinkLayer(devObj, netLayerEntity, platform), _ipParameters(ipParam), _dllcb(dllcb)
 {
 }
 
@@ -45,7 +45,8 @@ bool IpDataLinkLayer::sendFrame(CemiFrame& frame)
         return false;
     bool success = sendBytes(packet.data(), packet.totalLength());
 #ifdef KNX_ACTIVITYCALLBACK
-        knx.Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR));
+    if(_dllcb)
+        _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR));
 #endif
     dataConReceived(frame, success);
     return success;
@@ -261,7 +262,8 @@ void IpDataLinkLayer::loop()
         return;
 
 #ifdef KNX_ACTIVITYCALLBACK
-    knx.Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
+    if(_dllcb)
+        _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
 #endif
 
     uint16_t code;
@@ -282,18 +284,17 @@ void IpDataLinkLayer::loop()
 
             auto hpai = searchRequest.hpai();
 #ifdef KNX_ACTIVITYCALLBACK
-            knx.Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR) | (KNX_ACTIVITYCALLBACK_IPUNICAST));
+            if(_dllcb)
+                _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR) | (KNX_ACTIVITYCALLBACK_IPUNICAST));
 #endif
             _platform.sendBytesUniCast(hpai.ipAddress(), hpai.ipPortNumber(), searchResponse.data(), searchResponse.totalLength());
             break;
         }
-        
         case SearchRequestExt:
         {
             // FIXME, implement (not needed atm)
             break;
         }
-
 #ifdef KNX_TUNNELING
         case ConnectRequest:
         {
@@ -346,10 +347,8 @@ void IpDataLinkLayer::loop()
         }
 #endif
         default:
-#if defined(KNX_LOG_TUNNELING) || defined(KNX_LOG_IP)
             print("Unhandled service identifier: ");
             println(code, HEX);
-#endif
             break;
     }
 }
diff --git a/src/knx/ip_data_link_layer.h b/src/knx/ip_data_link_layer.h
index ef72b6de..20396615 100644
--- a/src/knx/ip_data_link_layer.h
+++ b/src/knx/ip_data_link_layer.h
@@ -14,7 +14,7 @@ class IpDataLinkLayer : public DataLinkLayer
 
   public:
     IpDataLinkLayer(DeviceObject& devObj, IpParameterObject& ipParam, NetworkLayerEntity& netLayerEntity,
-                    Platform& platform);
+                    Platform& platform, DataLinkLayerCallbacks* dllcb = nullptr);
 
     void loop();
     void enabled(bool value);
@@ -45,7 +45,7 @@ class IpDataLinkLayer : public DataLinkLayer
     bool isSendLimitReached();
 
     IpParameterObject& _ipParameters;
-
+    DataLinkLayerCallbacks* _dllcb;
 #ifdef KNX_TUNNELING
     KnxIpTunnelConnection tunnels[KNX_TUNNELING];
     uint8_t _lastChannelId = 1;
diff --git a/src/knx/tpuart_data_link_layer.cpp b/src/knx/tpuart_data_link_layer.cpp
index d951a910..9aeaf5e7 100644
--- a/src/knx/tpuart_data_link_layer.cpp
+++ b/src/knx/tpuart_data_link_layer.cpp
@@ -553,9 +553,11 @@ void TpUartDataLinkLayer::setFrameRepetition(uint8_t nack, uint8_t busy)
 TpUartDataLinkLayer::TpUartDataLinkLayer(DeviceObject& devObj,
                                          NetworkLayerEntity &netLayerEntity,
                                          Platform& platform,
-                                         ITpUartCallBacks& cb)
+                                         ITpUartCallBacks& cb,
+                                         DataLinkLayerCallbacks* dllcb)
     : DataLinkLayer(devObj, netLayerEntity, platform),
-      _cb(cb)
+      _cb(cb),
+      _dllcb(dllcb)
 {
 }
 
@@ -563,7 +565,8 @@ void TpUartDataLinkLayer::frameBytesReceived(uint8_t* buffer, uint16_t length)
 {
     //printHex("=>", buffer, length);
 #ifdef KNX_ACTIVITYCALLBACK
-    knx.Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
+    if(_dllcb)
+        _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
 #endif
     CemiFrame frame(buffer, length);
     frameReceived(frame);
@@ -672,7 +675,8 @@ bool TpUartDataLinkLayer::sendSingleFrameByte()
     {
         _TxByteCnt = 0;
 #ifdef KNX_ACTIVITYCALLBACK
-        knx.Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR));
+        if(_dllcb)
+            _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR));
 #endif
         return false;
     }
diff --git a/src/knx/tpuart_data_link_layer.h b/src/knx/tpuart_data_link_layer.h
index eae6d286..8070f4fc 100644
--- a/src/knx/tpuart_data_link_layer.h
+++ b/src/knx/tpuart_data_link_layer.h
@@ -22,7 +22,9 @@ class TpUartDataLinkLayer : public DataLinkLayer
 
   public:
     TpUartDataLinkLayer(DeviceObject& devObj, NetworkLayerEntity& netLayerEntity,
-                        Platform& platform, ITpUartCallBacks& cb);
+                        Platform& platform, ITpUartCallBacks& cb, DataLinkLayerCallbacks* dllcb = nullptr);
+
+
 
     void loop();
     void enabled(bool value);
@@ -77,5 +79,6 @@ class TpUartDataLinkLayer : public DataLinkLayer
     void stopChip();
 
     ITpUartCallBacks& _cb;
+    DataLinkLayerCallbacks* _dllcb;
 };
 #endif
diff --git a/src/knx_facade.h b/src/knx_facade.h
index 75d8fdb3..84c7feaa 100644
--- a/src/knx_facade.h
+++ b/src/knx_facade.h
@@ -189,22 +189,6 @@ template <class P, class B> class KnxFacade : private SaveRestore
     {
         _progLedOnCallback = progLedOnCallback;
     }
-
-#ifdef KNX_ACTIVITYCALLBACK
-    /// @brief sets the Callback Function indicating sent or received telegrams
-    /// @param activityCallback 
-    /// @details the info parameter 
-    void setActivityCallback(ActivityCallback activityCallback)
-    {
-        _activityCallback = activityCallback;
-    }
-
-    void Activity(uint8_t info)
-    {
-        if(_activityCallback)
-            _activityCallback(info);
-    }
-#endif
   
     int32_t buttonPin()
     {
diff --git a/src/rp2040_arduino_platform.cpp b/src/rp2040_arduino_platform.cpp
index 747b6549..b6da92d2 100644
--- a/src/rp2040_arduino_platform.cpp
+++ b/src/rp2040_arduino_platform.cpp
@@ -54,6 +54,15 @@ extern Wiznet5500lwIP KNX_NETIF;
 #elif defined(KNX_IP_WIFI)
 #elif defined(KNX_IP_GENERIC)
 
+
+#endif
+
+#ifndef KNX_UART_RX_PIN
+#define KNX_UART_RX_PIN UART_PIN_NOT_DEFINED
+#endif
+
+#ifndef KNX_UART_TX_PIN
+#define KNX_UART_TX_PIN UART_PIN_NOT_DEFINED
 #endif
 
 RP2040ArduinoPlatform::RP2040ArduinoPlatform()
@@ -61,6 +70,9 @@ RP2040ArduinoPlatform::RP2040ArduinoPlatform()
     : ArduinoPlatform(&KNX_SERIAL)
 #endif
 {
+    #ifndef KNX_NO_DEFAULT_UART
+    knxUartPins(KNX_UART_RX_PIN, KNX_UART_TX_PIN);
+    #endif
     #ifndef USE_RP2040_EEPROM_EMULATION
     _memoryType = Flash;
     #endif
@@ -73,6 +85,18 @@ RP2040ArduinoPlatform::RP2040ArduinoPlatform( HardwareSerial* s) : ArduinoPlatfo
     #endif
 }
 
+void RP2040ArduinoPlatform::knxUartPins(pin_size_t rxPin, pin_size_t txPin)
+{
+    SerialUART* serial = dynamic_cast<SerialUART*>(_knxSerial);
+    if(serial)
+    {
+        if (rxPin != UART_PIN_NOT_DEFINED)
+            serial->setRX(rxPin);
+        if (txPin != UART_PIN_NOT_DEFINED)
+            serial->setTX(txPin);
+    }
+}
+
 void RP2040ArduinoPlatform::setupUart()
 {
     SerialUART* serial = dynamic_cast<SerialUART*>(_knxSerial);
@@ -245,7 +269,6 @@ void RP2040ArduinoPlatform::writeBufferedEraseBlock()
 #if defined(KNX_NETIF)
 uint32_t RP2040ArduinoPlatform::currentIpAddress()
 {
-
     return KNX_NETIF.localIP();
 }
 uint32_t RP2040ArduinoPlatform::currentSubnetMask()
@@ -281,14 +304,12 @@ void RP2040ArduinoPlatform::setupMultiCast(uint32_t addr, uint16_t port)
     //    _unicast_socket_setup = UDP_UNICAST.begin(3671);
     #endif
 
-#ifdef KNX_LOG_IP
-    print("Setup Mcast addr: ");
-    print(mcastaddr.toString().c_str());
-    print(" on port: ");
-    print(port);
-    print(" result ");
-    println(result);
-#endif
+    // print("Setup Mcast addr: ");
+    // print(mcastaddr.toString().c_str());
+    // print(" on port: ");
+    // print(port);
+    // print(" result ");
+    // println(result);
 }
 
 void RP2040ArduinoPlatform::closeMultiCast()
@@ -298,10 +319,9 @@ void RP2040ArduinoPlatform::closeMultiCast()
 
 bool RP2040ArduinoPlatform::sendBytesMultiCast(uint8_t* buffer, uint16_t len)
 {
-#ifdef KNX_LOG_IP
-    printHex("<- ",buffer, len);
-#endif
-    //ToDo: check if Ethernet is able to receive
+    // printHex("<- ",buffer, len);
+    //ToDo: check if Ethernet is able to receive, return false if not
+
     _udp.beginPacket(mcastaddr, _port);
     _udp.write(buffer, len);
     _udp.endPacket();
@@ -324,12 +344,11 @@ int RP2040ArduinoPlatform::readBytesMultiCast(uint8_t* buffer, uint16_t maxLen)
     }
 
     _udp.read(buffer, len);
-#ifdef KNX_LOG_IP
-    print("Remote IP: ");
-    print(_udp.remoteIP().toString().c_str());
 
-    printHex("-> ", buffer, len);
-#endif
+    // print("Remote IP: ");
+    // print(_udp.remoteIP().toString().c_str());
+    // printHex("-> ", buffer, len);
+
     return len;
 }
 
@@ -338,10 +357,8 @@ bool RP2040ArduinoPlatform::sendBytesUniCast(uint32_t addr, uint16_t port, uint8
 {
     IPAddress ucastaddr(htonl(addr));
     
-#ifdef KNX_LOG_IP
-    print("sendBytesUniCast to:");
-    println(ucastaddr.toString().c_str());
-#endif
+    // print("sendBytesUniCast to:");
+    // println(ucastaddr.toString().c_str());
 
 #ifdef KNX_IP_GENERIC
     if(!_unicast_socket_setup)
diff --git a/src/rp2040_arduino_platform.h b/src/rp2040_arduino_platform.h
index e6df5466..b71b3b4d 100644
--- a/src/rp2040_arduino_platform.h
+++ b/src/rp2040_arduino_platform.h
@@ -65,6 +65,8 @@ class RP2040ArduinoPlatform : public ArduinoPlatform
     RP2040ArduinoPlatform();
     RP2040ArduinoPlatform( HardwareSerial* s);
 
+    // uart
+    void knxUartPins(pin_size_t rxPin, pin_size_t txPin);
     void setupUart();
 
     // unique serial number