How can I recieve nRF51822 Rx data?

Question

I find this function.
tx 
 void ble_send(uint8_t * data, uint8_t length)
{
ble_nus_send_string(&m_nus, data,length); 
 } 
 ble_send(&data_array[0],10); 
 but I don't find Rx Function 
 Rx Function defined ble_nus.c 
 I don't know how do I use Rx Function.....

FormerMember · Accepted Answer

From what I can see, you are using the experimental_ble_app_uart example? 
 The data will be received in a BLE event. Data written to the RX characteristic will be handled in ble_nus_on_ble_evt -> BLE_GATTS_EVT_WRITE -> on_write(..) -> p_nus->data_handler. 
 p_nus->data_handler is set in services_init(..): nus_init.data_handler = nus_data_handler; 
 nus_data_handler(..) will transfer the received data over UART (to a terminal): 
 /**@brief Function for handling the data from the Nordic UART Service.
 *
 * @details This function will process the data received from the Nordic UART BLE Service and send
 * it to the UART module.
 */
/**@snippet [Handling the data received over BLE] */
void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
 for (int i = 0; i < length; i++)
 {
 simple_uart_put(p_data[i]);
 }
 simple_uart_put('
');
}

How can I recieve nRF51822 Rx data?

I find this function. tx

ble_send(&data_array[0],10);