added RESULT_ERR_NO_SIGNAL

src/lib/ebus/result.cpp

@@ -48,6 +48,7 @@ const char* getResultCode(result_t resultCode) {
 	case RESULT_ERR_CRC:          return "ERR: CRC error";
 	case RESULT_ERR_ACK:          return "ERR: ACK error";
 	case RESULT_ERR_NAK:          return "ERR: NAK received";
+	case RESULT_ERR_NO_SIGNAL:    return "ERR: no signal";
 	default:
 		if (resultCode >= 0)
 			return "success: unknown result code";

src/lib/ebus/result.h

@@ -51,6 +51,8 @@ static const int RESULT_ERR_CRC = -18;          //!< CRC error
 static const int RESULT_ERR_ACK = -19;          //!< ACK error
 static const int RESULT_ERR_NAK = -20;          //!< NAK received
 
+static const int RESULT_ERR_NO_SIGNAL = -21;    //!< no signal found on the bus
+
 /** type for result code. */
 typedef int result_t;