send and receive data over BLE

hello sir, i am using ble mpu example and it working fine now i want do send some commands from mobile to nrf52832 chip via these commands my application should work.

like if i send command "ON" through mobile then application should work, if i send command "OFF" through mobile then application should stop.

how can i do that, one thing i saw that NUS(nordic Uart service) in NUS service i can handle data coming from mobile to nrf52832 but i don't know how to continous data to mobile.

i tried to merge NUS service with BLE mpu example and it is not showing any error or warning. after adding NUS service bluetooth device was hidden. i was unable to resolve what was the problem.

so please tell what is the best possible way to send and receive data using from nrf52832 to mobile and vice versa.

i am using keil, nrf52 DK, sdk11, s132.