※ Characteristic
- Bluetooth 2.0 / Bluetooth 4.0 BLE connection : HC-05, HC-06, HM-10, AT-09, BT05 (Android version 10 or lower)
- Connect wifi AP and control arduino (Android version 8 or lower)
- 12 digital buttons: toggle and push button property setting
- 3 analog controllers: Min and Max value setting
- Text input
- Main screen display setting
- Button label customization
- Changed label and setting value saving function (internal DB)
- Label external file storage function: /arduino_BT_button_label.txt

※ Configuration
- Main screen
- Display setting screen
- Button property setting screen

※ blog
https://nxpop.tistory.com/2

* The Aduino code can be downloaded from the blog.