diff --git a/src/hoverboard-esc-serial-comm.cpp b/src/hoverboard-esc-serial-comm.cpp
index e5fa96e..0df9b9c 100644
--- a/src/hoverboard-esc-serial-comm.cpp
+++ b/src/hoverboard-esc-serial-comm.cpp
@@ -1,7 +1,6 @@
 #include "hoverboard-esc-serial-comm.h"
 
 
-
 ESCSerialComm::ESCSerialComm(HardwareSerial &_serialRef) { //constructor
     serialRef=&_serialRef;
     wheelcircumference=0.5278; //8.4cm radius -> 0.084m*2*Pi
@@ -193,20 +192,22 @@ void ESCSerialComm::updateMotorparams(unsigned long loopmillis) {
 
 }
 
-int sort_desc(const void *cmp1, const void *cmp2) //compare function for qsort
+
+int _sort_desc(const void *cmp1, const void *cmp2) //compare function for qsort
 {
   float a = *((float *)cmp1);
   float b = *((float *)cmp2);
   return a > b ? -1 : (a < b ? 1 : 0);
 }
 
-float filterMedian(int16_t* values) {
+
+float ESCSerialComm::filterMedian(int16_t* values) {
   float copied_values[CURRENT_FILTER_SIZE];
   for(int i=0;i<CURRENT_FILTER_SIZE;i++) {
     copied_values[i] = values[i]; //TODO: maybe some value filtering/selection here
   }
   float copied_values_length = sizeof(copied_values) / sizeof(copied_values[0]);
-  qsort(copied_values, copied_values_length, sizeof(copied_values[0]), sort_desc);
+  qsort(copied_values, copied_values_length, sizeof(copied_values[0]), _sort_desc);
 
   float mean=copied_values[CURRENT_FILTER_SIZE/2];
   for (uint8_t i=1; i<=CURRENT_MEANVALUECOUNT;i++) {
@@ -302,4 +303,8 @@ float ESCSerialComm::getMaxcurR() {
 
 unsigned long ESCSerialComm::getFeedbackInterval() {
   return feedback_interval_timed;
+}
+
+bool ESCSerialComm::getControllerConnected() {
+  return controller_connected;
 }
\ No newline at end of file
diff --git a/src/hoverboard-esc-serial-comm.h b/src/hoverboard-esc-serial-comm.h
index ad65306..79c7265 100644
--- a/src/hoverboard-esc-serial-comm.h
+++ b/src/hoverboard-esc-serial-comm.h
@@ -3,9 +3,7 @@
 
 #include <Arduino.h>
 
-
-int sort_desc(const void *cmp1, const void *cmp2);
-float filterMedian(int16_t* values);
+int _sort_desc(const void *cmp1, const void *cmp2);
 
 #define SERIAL_CONTROL_BAUD   115200       // [-] Baud rate for HoverSerial (used to communicate with the hoverboard)
 #define START_FRAME         0xABCD       // [-] Start frme definition for reliable serial communication
@@ -105,7 +103,9 @@ class ESCSerialComm
     float getMaxcurR();
 
     unsigned long getFeedbackInterval(); //get time from last received feedback
-    unsigned long getTripTime(unsigned long loopmillis) ;
+    unsigned long getTripTime(unsigned long loopmillis);
+
+    bool getControllerConnected();
 
     void resetStatistics();
 
@@ -156,6 +156,9 @@ class ESCSerialComm
 
     void SendSerial(int16_t uSpeedLeft, int16_t uSpeedRight);
     bool ReceiveSerial();
+
+    
+    float filterMedian(int16_t* values);
 };
 #endif