Use APKPure App
Get Bluetooth Control Panel old version APK for Android
Control microprocessors such as Arduino, ESP8266, Raspberry Pi over Bluetooth.
Control microprocessors such as Arduino, PICs, Microbits, ESP8266, and others over Bluetooth using the common HC-06 and HC-05 (or similar) Bluetooth modules
The app is self-contained and all setup is done from the microprocessor.
See http://www.martyncurrey.com/bluetooth-control-panel/ for full details and examples.
Requires the MCU and Bluetooth module to be connected using UART.