How to send data from nordic nrf52840 to BLE android app nrfConnect?

Question

Hi everyone, 
 First of all ,Thanks for being such a supportive forum, I ask a lot of questions(I am a beginner to nordic and BLE) 
 I am using the example given in the sdk named "ble_app_uart" which emulates UART on the nrf Connect App. 
 I am able to receive the data and print the data onto the serial terminal from the android app ,nrFconnect. 
 But my aim is to achieve both sides communication in which i want to send some data from the microcontroller to the android app. 
 The sample code uses a function nus_data_handler but it does so only to print the received data to serial terminal. 
 Is there any function to achieve this objective? 
 What is the process i need to follow? 
 
 Thanks 
 Rajat!.

Simon · Accepted Answer

In order to send messages from the microcontroller to the app you need to use the following function: 
 ble_nus_string_send(&m_nus, data, sizeof(data)) 
 Here are some links that shows how to use the function: 
 https://devzone.nordicsemi.com/f/nordic-q-a/27207/sending-number-over-ble-with-ble_nus_string_send#post-id-176984 
 https://devzone.nordicsemi.com/f/nordic-q-a/30545/how-to-use-ble_nus_string_send-correctly 
 
 Best regards Simon Iversen