../Libraries/IS_Bluetooth.cpp:8:3: error: 'sprintf' was not declared in this scope
8 | sprintf((char*)buf,"Bootloader Mode\n\r");
| ^~~~~~~
../Libraries/IS_Bluetooth.cpp:2:1: note: 'sprintf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
1 | #include "IS_Bluetooth.h"
+++ |+#include <cstdio>
2 |