NRF52832 MESH with UART

Question

want to add UART communication to nRF52832 with mesh enable.

I have added,

nrf_drv_uart.c
nrfc_prs.c
nrfc_uart.c
nrfc_uarte.c

files into nRF_Drivers folder in project and added User include directories for them and also I have added

app_fifo.c
app_uart_fifo.c
retarget.c

files into nRF_Libraries folder in project and added User include directories also for them

In sdk_config.h I have made following settings,

NRFX_UARTE_ENABLED 1
NRFX_UARTE0_ENABLED 1
NRFX_UART_ENABLED 1
NRFX_UART0_ENABLED 1
NRFX_PRS_ENABLED 1
NRFX_PRS_BOX_4_ENABLED 1

and

UART_EASY_DMA_SUPPORT 1
UART_LEGACY_SUPPORT 1

And project also compiled after setting above configurations.

Code I made as follow (Modified version on light switch server )

#include "app_uart.h"


#if defined (UART_PRESENT)
#include "nrf_uart.h"
#endif
#if defined (UARTE_PRESENT)
#include "nrf_uarte.h"
#endif


#define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE                256   


/*
other functions same as light switch server example

*/

void uart_event_handle(app_uart_evt_t * p_event)
{
    static uint8_t data_array[50];
    static uint8_t index = 0;
    uint32_t       err_code;
    
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Handler\n");
    //__LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "evt %d\n", p_event->evt_type);

    switch (p_event->evt_type)
    {
        
        case APP_UART_DATA_READY:
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "app data ready\n");
            UNUSED_VARIABLE(app_uart_get(&data_array[index]));
            index++;

            if (data_array[index - 1] == '\n') 
            {
                if (index > 1)
                {
                    /*
                        Need to implement the function in here
                    
                    */
                    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Receive\n");
                }

                index = 0;
            }
            break;

        case APP_UART_COMMUNICATION_ERROR:
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Communication ERROR\n");
            APP_ERROR_HANDLER(p_event->data.error_communication);
            break;

        case APP_UART_FIFO_ERROR:
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "FIFO ERROR\n");
            APP_ERROR_HANDLER(p_event->data.error_code);
            break;

        default:
            break;
    }
}


static void uart_init(void)
{

//    #define RX_PIN_NUMBER  8
//    #define TX_PIN_NUMBER  7
//    #define CTS_PIN_NUMBER 6
//    #define RTS_PIN_NUMBER 5
    uint32_t                     err_code;
    app_uart_comm_params_t const comm_params =
    {
        .rx_pin_no    = RX_PIN_NUMBER,
        .tx_pin_no    = TX_PIN_NUMBER,
        .rts_pin_no   = NULL,           //RTS_PIN_NUMBER,
        .cts_pin_no   = NULL,           //CTS_PIN_NUMBER,
        .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
        .use_parity   = false,
#if defined (UART_PRESENT)
        .baud_rate    = NRF_UART_BAUDRATE_9600
#else
        .baud_rate    = NRF_UART_BAUDRATE_9600
#endif
    };

    APP_UART_FIFO_INIT(&comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,     //NRF_MESH_IRQ_PRIORITY_LOWEST,    //
                       err_code);
    APP_ERROR_CHECK(err_code);
}

/*
initilize uart_init inside initializer
*/

static void initialize(void)
{ 
    uart_init();
    __LOG_INIT(LOG_SRC_APP | LOG_SRC_ACCESS | LOG_SRC_BEARER, LOG_LEVEL_INFO, LOG_CALLBACK_DEFAULT);
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "----- BLE Mesh Light Switch Server Demo -----\n");

    ERROR_CHECK(app_timer_init());
    hal_leds_init();

#if BUTTON_BOARD
    ERROR_CHECK(hal_buttons_init(button_event_handler));
#endif

    ble_stack_init();

#if MESH_FEATURE_GATT_ENABLED
    gap_params_init();
    conn_params_init();
#endif

    mesh_init();
    
}

Following result got through debugging,

<t:          0>, main.c,  438, ----- BLE Mesh Light Switch Server Demo -----
<t:      13810>, main.c,  380, Initializing and adding models
<t:      13813>, main.c,  224, App OnOff Model Handle: 2
<t:      18763>, main.c,  479, Device UUID : 005955AA00000000E5F8D4197B5E9BA2
<t:     245432>, main.c,  308, Handler
<t:     245433>, main.c,  331, Communication ERROR
<t:     245436>, app_error_weak.c,  119, Mesh error 4 at 0x00000000 (:0)

according to above result once development board receive a signal through RX pin uart_event_handler function calls as expected, and inside that handler I got APP_UART_COMMUNICATION_ERROR

So what would be the cause for this error.

Is there any .c file missing or something with the code