패스키 최초 1회 변경 가능 제한

src/main.h

@@ -74,6 +74,7 @@ extern volatile bool processing;
 extern char SERIAL_NO[SERIAL_NO_BUF_SIZE];
 extern char HW_NO[HW_NO_BUF_SIZE];
 extern char m_static_passkey[PASSKEY_BUF_SIZE];
+extern uint8_t m_passkey_changed;
 extern bool bond_data_delete;
 extern uint32_t m_life_cycle;
 extern uint8_t m_reset_status;