Need to have sfTkIBus as public inheritence. Add another error condition.

Author: SFE-Brudnerd

src/sfTk/sfTkIBus.h

@@ -62,6 +62,12 @@ const sfTkError_t ksfTkErrBusUnderRead = ksfTkErrBaseBus + 7;
  */
 const sfTkError_t ksfTkErrBusNotEnabled = ksfTkErrBaseBus + 8;
 
+/**
+ * @brief Returned when the data received is not valid or does not match the expected format.
+ * 
+ */
+const sfTkError_t ksfTkErrBusBadData = ksfTkErrFail * (ksfTkErrBaseBus + 9);
+
 /**
  * @brief Interface that defines the communication bus for the SparkFun Electronics Toolkit.
  *

src/sfTk/sfTkISerialBus.h

@@ -21,7 +21,7 @@
 
 const uint8_t ksfTkBusTypeSerialBus = 0x03;
 
-class sfTkISerialBus : sfTkIBus
+class sfTkISerialBus : public sfTkIBus
 {
   public:
     /**