App for ESC's based on the VESC to see realtime data and change modes.

You need a HM-10 Bluetooth low energy module.
Connect it to via UART with the ESC.
5V or 3.3 V -> VCC
GND -> GND
RX -> TX
TX -> RX
Activate UART by PPM+UART as application
Set the UART Baud Rate to 9600