add macro

Author: Darby Lim

c++/include/dynamixel_sdk/packet_handler.h

@@ -24,6 +24,11 @@
 
 #if defined(ARDUINO) || defined(__OPENCR__) || defined(__OPENCM904__)
 #include <Arduino.h>
+
+#define ERROR_PRINT  SerialBT2.print
+#else
+#define ERROR_PRINT  printf
+
 #endif
 
 #include <stdio.h>