USART Central Echoing Data

Question

Hi 
 In the example Nordic UART BLE_central, I notice that when I send data over UART to the central device, it echoes the data sent and I see it as an output in the central's UART. This does not seem to happen for the peripheral device. Is this intentional? I do not see any documentation or any code that suggests that this should happen. Am I doing something wrong? 
 Thanks

Nicholas Lee · Answer

There is a line of code in the "central" example as follows: #define ECHOBACK_BLE_UART_DATA 1 //< Echo the UART data that is received over the Nordic UART Service (NUS) back to the sender. If you set the value to 0, instead of 1, then it stops echoing.