diff --git a/src/lib/ebus/result.cpp b/src/lib/ebus/result.cpp
index ba2f6008..9fa53faf 100644
--- a/src/lib/ebus/result.cpp
+++ b/src/lib/ebus/result.cpp
@@ -22,7 +22,7 @@
 namespace libebus
 {
 
-const char* getResultCodeCStr(int resultCode) {
+const char* getResultCodeCStr(result_t resultCode) {
 	switch (resultCode) {
 		case RESULT_ERR_SEND: return "ERR_SEND: send error";
 		case RESULT_ERR_EXTRA_DATA: return "ERR_EXTRA_DATA: received bytes > sent bytes";
@@ -35,7 +35,11 @@ const char* getResultCodeCStr(int resultCode) {
 		case RESULT_ERR_ESC: return "ERR_ESC: invalid escape sequence received";
 		case RESULT_ERR_INVALID_ARG: return "ERR_INVALID_ARG: invalid argument specified";
 		case RESULT_ERR_DEVICE: return "ERR_DEVICE: generic device error";
-		default: return "success";
+		case RESULT_ERR_EOF: return "ERR_EOF: end of input reached";
+		default:
+			if (resultCode >= 0)
+				return "success";
+			return "ERR: unknown error code";
 	}
 }
 
diff --git a/src/lib/ebus/result.h b/src/lib/ebus/result.h
index 7a439382..0298e62f 100644
--- a/src/lib/ebus/result.h
+++ b/src/lib/ebus/result.h
@@ -44,14 +44,17 @@ static const int RESULT_ERR_BUS_LOST = -8;     // arbitration lost
 static const int RESULT_ERR_ESC = -9;          // invalid escape sequence received
 static const int RESULT_ERR_INVALID_ARG = -10; // invalid argument
 static const int RESULT_ERR_DEVICE = -11;      // generic device error (usually fatal)
+static const int RESULT_ERR_EOF = -12;         // end of input reached
 
+/** type for result code. */
+typedef int result_t;
 
 /**
  * @brief Return the string corresponding to the result code.
  * @param resultCode the result code (see RESULT_ constants).
  * @return the string corresponding to the result code.
  */
-const char* getResultCodeCStr(int resultCode);
+const char* getResultCodeCStr(result_t resultCode);
 
 
 } //namespace