您好，

1、ble_app_uart_multi_link example在收到数据后，只是简单做了数据统计，没有用UART输出，您这边可以在收到MLMR_EVT_RX_DATA_RECEIVED消息后将数据发给UART，您可以参考ble_app_uart example。

static void mlmr_service_process_event(mlmr_evt_t *p_evt)
{
    switch (p_evt->evt_type)
    {
        case MLMR_EVT_TX_PORT_OPENED:
            transport_flag_set(BLE_TX_NTF_ENABLE, true);
            if(notify_enable_flag[p_evt->conn_idx] == false)
            {
                notify_enable_flag[p_evt->conn_idx] = true;
                notify_enable_num++;
            }
            if(notify_enable_num == 5)
            {
                app_timer_start(s_slave_timer_id, SLAVE_SEND_DATA_INTERVAL, NULL);
                app_timer_start(s_send_packet_num_id, SEND_PACKET_NUM_INTERVAL, NULL);
            }
            break;

        case MLMR_EVT_TX_PORT_CLOSED:
            notify_enable_flag[p_evt->conn_idx] = false;
            transport_flag_set(BLE_TX_NTF_ENABLE, false);
            break;

        case MLMR_EVT_RX_DATA_RECEIVED:
            rx_packet_right_rate(p_evt->length,p_evt->p_data);
            break;

        default:
            break;
    }
}