Author: Li Chi Kin (Andy) ckliam
[https://www.youtube.com/watch?v=w5LgLsCumFI]
Although it is not using STM32 board in the video, the method is the same. You can use the same method to connect the app to the HC05 Bluetooth Module.
[https://www.youtube.com/watch?v=UsDRkprcLsM]