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Event based app_uart is not working

Hi, I am trying to run event based UART. here is my code snippet:

void uart_callback(app_uart_evt_t *p_app_uart_event)
{
uint8_t rxbyte;
switch(p_app_uart_event->evt_type)
{
case APP_UART_DATA_READY:

        while((app_uart_get(&rxbyte) == NRF_SUCCESS))
        {
            rx_buffer[rx_buf_len++] = rxbyte;
            if(rxbyte == '\n')
            {
                uart_putstring(rx_buffer);
                rx_buf_len = 0;
                break;
            }
            if(rx_buf_len == RX_BUFF_SIZE)
                break;
        }

        /********************************************/
        /* if(app_uart_get(&rxbyte) == NRF_SUCCESS) */
        /*     app_uart_put(rxbyte);                */
        /********************************************/
        break;
    case APP_UART_TX_EMPTY:
        break;
    case APP_UART_COMMUNICATION_ERROR:
        break;
    case APP_UART_FIFO_ERROR:
        break;
    default:
        break;

}
}
/**@brief Function for initializing the UART module.**/
static void uart_init(void)
{
static const app_uart_comm_params_t comm_params =
{
    .rx_pin_no = RX_PIN_NUMBER,
    .tx_pin_no = TX_PIN_NUMBER,
    .rts_pin_no = RTS_PIN_NUMBER,
    .cts_pin_no = CTS_PIN_NUMBER,
    .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
    .use_parity = false,
    .baud_rate = UART_BAUDRATE_BAUDRATE_Baud4800
};
uint32_t errcode = 0;

rx_buf_len = 0;
APP_UART_FIFO_INIT(&comm_params, RX_BUFF_SIZE, TX_BUFF_SIZE, uart_callback, APP_IRQ_PRIORITY_LOW, errcode);
//APP_UART_INIT(&comm_params, uart_callback, APP_IRQ_PRIORITY_LOW, errcode);
APP_ERROR_CHECK(errcode);
}

in main() among others I am calling uart_init() which initialises uart and enables interrupts as you can see above in code. when uart interrupt occurs my uart_callback should be called, but when I connect 6310 motherboard's rs232 to PC nothing happens. Could you please help me? what I am doing wrong? I am using:

gcc Compiler

6310 Motherboard + pca1004

SDK Version 6.1.0.0

Kind Regards Shuhrat

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