diff --git a/src/lib/ebus/result.cpp b/src/lib/ebus/result.cpp
index c8a3cba3..5acd5676 100644
--- a/src/lib/ebus/result.cpp
+++ b/src/lib/ebus/result.cpp
@@ -49,6 +49,7 @@ const char* getResultCode(result_t resultCode) {
   case RESULT_ERR_NAK:          return "ERR: NAK received";
   case RESULT_ERR_NO_SIGNAL:    return "ERR: no signal";
   case RESULT_ERR_SYN:          return "ERR: SYN received";
+  case RESULT_ERR_NOTAUTHORIZED: return "ERR: not authorized";
 
   default:
     if (resultCode >= 0) {
diff --git a/src/lib/ebus/result.h b/src/lib/ebus/result.h
index e99f5d37..de15b2a8 100644
--- a/src/lib/ebus/result.h
+++ b/src/lib/ebus/result.h
@@ -31,37 +31,39 @@ namespace ebusd {
 
 /** type for result code. */
 enum result_t {
-  RESULT_OK = 0,                  //!< success
+  RESULT_OK = 0,                    //!< success
 
-  RESULT_CONTINUE = 1,            //!< more input data is needed (e.g. start of escape sequence received)
-  RESULT_EMPTY = 2,               //!< empty result
+  RESULT_CONTINUE = 1,              //!< more input data is needed (e.g. start of escape sequence received)
+  RESULT_EMPTY = 2,                 //!< empty result
 
-  RESULT_ERR_GENERIC_IO = -1,     //!< generic I/O error (usually fatal)
-  RESULT_ERR_DEVICE = -2,         //!< generic device error (usually fatal)
-  RESULT_ERR_SEND = -3,           //!< send error
-  RESULT_ERR_ESC = -4,            //!< invalid escape sequence
-  RESULT_ERR_TIMEOUT = -5,        //!< read timeout
+  RESULT_ERR_GENERIC_IO = -1,       //!< generic I/O error (usually fatal)
+  RESULT_ERR_DEVICE = -2,           //!< generic device error (usually fatal)
+  RESULT_ERR_SEND = -3,             //!< send error
+  RESULT_ERR_ESC = -4,              //!< invalid escape sequence
+  RESULT_ERR_TIMEOUT = -5,          //!< read timeout
 
-  RESULT_ERR_NOTFOUND = -6,       //!< file/element not found or not readable
-  RESULT_ERR_EOF = -7,            //!< end of input reached
-  RESULT_ERR_INVALID_ARG = -8,    //!< invalid argument
-  RESULT_ERR_INVALID_NUM = -9,    //!< invalid numeric argument
-  RESULT_ERR_INVALID_ADDR = -10,  //!< invalid address
-  RESULT_ERR_INVALID_POS = -11,   //!< invalid position
-  RESULT_ERR_OUT_OF_RANGE = -12,  //!< argument value out of valid range
-  RESULT_ERR_INVALID_PART = -13,  //!< invalid part type value
-  RESULT_ERR_MISSING_TYPE = -14,  //!< missing data type
-  RESULT_ERR_INVALID_LIST = -15,  //!< invalid value list
-  RESULT_ERR_DUPLICATE = -16,     //!< duplicate entry
-  RESULT_ERR_DUPLICATE_NAME = -17,//!< duplicate entry (name)
+  RESULT_ERR_NOTFOUND = -6,         //!< file/element not found or not readable
+  RESULT_ERR_EOF = -7,              //!< end of input reached
+  RESULT_ERR_INVALID_ARG = -8,      //!< invalid argument
+  RESULT_ERR_INVALID_NUM = -9,      //!< invalid numeric argument
+  RESULT_ERR_INVALID_ADDR = -10,    //!< invalid address
+  RESULT_ERR_INVALID_POS = -11,     //!< invalid position
+  RESULT_ERR_OUT_OF_RANGE = -12,    //!< argument value out of valid range
+  RESULT_ERR_INVALID_PART = -13,    //!< invalid part type value
+  RESULT_ERR_MISSING_TYPE = -14,    //!< missing data type
+  RESULT_ERR_INVALID_LIST = -15,    //!< invalid value list
+  RESULT_ERR_DUPLICATE = -16,       //!< duplicate entry
+  RESULT_ERR_DUPLICATE_NAME = -17,  //!< duplicate entry (name)
 
-  RESULT_ERR_BUS_LOST = -18,      //!< arbitration lost
-  RESULT_ERR_CRC = -19,           //!< CRC error
-  RESULT_ERR_ACK = -20,           //!< ACK error
-  RESULT_ERR_NAK = -21,           //!< NAK received
+  RESULT_ERR_BUS_LOST = -18,        //!< arbitration lost
+  RESULT_ERR_CRC = -19,             //!< CRC error
+  RESULT_ERR_ACK = -20,             //!< ACK error
+  RESULT_ERR_NAK = -21,             //!< NAK received
 
-  RESULT_ERR_NO_SIGNAL = -22,     //!< no signal found on the bus
-  RESULT_ERR_SYN = -23,           //!< SYN received instead of answer
+  RESULT_ERR_NO_SIGNAL = -22,       //!< no signal found on the bus
+  RESULT_ERR_SYN = -23,             //!< SYN received instead of answer
+
+  RESULT_ERR_NOTAUTHORIZED = -24    //!< not authorized for this action
 };