diff --git a/src/knx/bau07B0.cpp b/src/knx/bau07B0.cpp
index 92fe665..c68ecb2 100644
--- a/src/knx/bau07B0.cpp
+++ b/src/knx/bau07B0.cpp
@@ -151,18 +151,4 @@ bool Bau07B0::isAckRequired(uint16_t address, bool isGrpAddr)
     return false;
 }
 
-// /// @brief sets the Callback Function indicating sent or received telegrams
-// /// @param activityCallback 
-// /// @details the info parameter 
-// void Bau07B0::setActivityCallback(ActivityCallback activityCallback)
-// {
-//     _activityCallback = activityCallback;
-// }
-
-// void Bau07B0::Activity(uint8_t info)
-// {
-//     if(_activityCallback)
-//         _activityCallback(info);
-// }
-
 #endif
diff --git a/src/knx/data_link_layer.cpp b/src/knx/data_link_layer.cpp
index 8de99f8..be9d6fa 100644
--- a/src/knx/data_link_layer.cpp
+++ b/src/knx/data_link_layer.cpp
@@ -7,7 +7,7 @@
 #include "cemi_frame.h"
 
 
-void DataLinkLayerCallbacks::Activity(uint8_t info)
+void DataLinkLayerCallbacks::activity(uint8_t info)
 {
     if(_activityCallback)
         _activityCallback(info);
diff --git a/src/knx/data_link_layer.h b/src/knx/data_link_layer.h
index fe0d474..817078e 100644
--- a/src/knx/data_link_layer.h
+++ b/src/knx/data_link_layer.h
@@ -18,7 +18,7 @@ protected:
     ActivityCallback _activityCallback = nullptr;
 public:
     virtual ~DataLinkLayerCallbacks() = default;
-    virtual void Activity(uint8_t info);
+    virtual void activity(uint8_t info);
     virtual void setActivityCallback(ActivityCallback activityCallback);
 };
 
diff --git a/src/knx/ip_data_link_layer.cpp b/src/knx/ip_data_link_layer.cpp
index aad2c14..aa291cc 100644
--- a/src/knx/ip_data_link_layer.cpp
+++ b/src/knx/ip_data_link_layer.cpp
@@ -32,7 +32,7 @@ bool IpDataLinkLayer::sendFrame(CemiFrame& frame)
     bool success = sendBytes(packet.data(), packet.totalLength());
 #ifdef KNX_ACTIVITYCALLBACK
     if(_dllcb)
-        _dllcb->Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR));
+        _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_SEND << KNX_ACTIVITYCALLBACK_DIR));
 #endif
     dataConReceived(frame, success);
     return success;
@@ -57,7 +57,7 @@ void IpDataLinkLayer::loop()
 
 #ifdef KNX_ACTIVITYCALLBACK
     if(_dllcb)
-        _dllcb->Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
+        _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
 #endif
 
     uint16_t code;
@@ -77,8 +77,8 @@ void IpDataLinkLayer::loop()
 
             auto hpai = searchRequest.hpai();
 #ifdef KNX_ACTIVITYCALLBACK
-    if(_dllcb)
-        _dllcb->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;
diff --git a/src/knx/tpuart_data_link_layer.cpp b/src/knx/tpuart_data_link_layer.cpp
index 2af0dda..1c9f777 100644
--- a/src/knx/tpuart_data_link_layer.cpp
+++ b/src/knx/tpuart_data_link_layer.cpp
@@ -550,7 +550,7 @@ void TpUartDataLinkLayer::frameBytesReceived(uint8_t* buffer, uint16_t length)
     //printHex("=>", buffer, length);
 #ifdef KNX_ACTIVITYCALLBACK
     if(_dllcb)
-        _dllcb->Activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
+        _dllcb->activity((_netIndex << KNX_ACTIVITYCALLBACK_NET) | (KNX_ACTIVITYCALLBACK_DIR_RECV << KNX_ACTIVITYCALLBACK_DIR));
 #endif
     CemiFrame frame(buffer, length);
     frameReceived(frame);
@@ -659,8 +659,8 @@ bool TpUartDataLinkLayer::sendSingleFrameByte()
     {
         _TxByteCnt = 0;
 #ifdef KNX_ACTIVITYCALLBACK
-    if(_dllcb)
-        _dllcb->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 4551fcf..c2e46f3 100644
--- a/src/knx/tpuart_data_link_layer.h
+++ b/src/knx/tpuart_data_link_layer.h
@@ -21,8 +21,6 @@ class TpUartDataLinkLayer : public DataLinkLayer
     using DataLinkLayer::_platform;
 
   public:
-    // TpUartDataLinkLayer(DeviceObject& devObj, NetworkLayerEntity& netLayerEntity,
-    //                     Platform& platform, ITpUartCallBacks& cb);
     TpUartDataLinkLayer(DeviceObject& devObj, NetworkLayerEntity& netLayerEntity,
                         Platform& platform, ITpUartCallBacks& cb, DataLinkLayerCallbacks* dllcb = nullptr);