Ble pairing with authentication

[ShubMane]

1. I had done the pairing without any authentication but now I want to do it with the authentication with an authentication key.

2. please provide some sample code regarding the pairing authentication and its process.

[ShubMane]

static void nus_data_handler(ble_nus_evt_t * p_evt)
{
    int attempt = 0;
    char arr[6];
    char arr_1[6];
    
    bool flag = 0;
    
    if (p_evt->type == BLE_NUS_EVT_RX_DATA)
    {
        uint32_t err_code;

        NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
        NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);

        for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
        {
            do
            {
                err_code = app_uart_put(p_evt->params.rx_data.p_data[i]);

                if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
                {
                    NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
                    APP_ERROR_CHECK(err_code);
                }
            }while (err_code == NRF_ERROR_BUSY);
        }
        if(p_evt->params.rx_data.p_data[p_evt->params.rx_data.length - 1] == '\r')
        {
            while (app_uart_put('\n') == NRF_ERROR_BUSY);
        }

        //storing the data into array which is comming from the ble_master(nrf_connect app)
        for(int i=0; i<=5; i++)
        {
          arr[i] = p_evt->params.rx_data.p_data[i];
        }

        if(strcmp(arr, "123456") == 0)
        {
          printf("\nPassword is correct");
        }

        if(strcmp(arr, "123456") != 0)
        {
          printf("\nPassword is incorrect!!! Please try again");
          printf("\nPassword : ");

          //strcpy(arr_1, arr);

          if(strcmp(arr, "123456") == 0)
          {
            printf("\nPassword is correct");            
          }

        }    
    }
}

[ShubMane]

static void nus_data_handler(ble_nus_evt_t * p_evt)
{
    int attempt = 0;
    char arr[6];
    char arr_1[6];
    
    bool flag = 0;
    
    if (p_evt->type == BLE_NUS_EVT_RX_DATA)
    {
        uint32_t err_code;

        NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
        NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);

        for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
        {
            do
            {
                err_code = app_uart_put(p_evt->params.rx_data.p_data[i]);

                if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
                {
                    NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
                    APP_ERROR_CHECK(err_code);
                }
            }while (err_code == NRF_ERROR_BUSY);
        }
        if(p_evt->params.rx_data.p_data[p_evt->params.rx_data.length - 1] == '\r')
        {
            while (app_uart_put('\n') == NRF_ERROR_BUSY);
        }

        //storing the data into array which is comming from the ble_master(nrf_connect app)
        for(int i=0; i<=5; i++)
        {
          arr[i] = p_evt->params.rx_data.p_data[i];
        }

        if(strcmp(arr, "123456") == 0)
        {
          printf("\nPassword is correct");
        }

        if(strcmp(arr, "123456") != 0)
        {
          printf("\nPassword is incorrect!!! Please try again");
          printf("\nPassword : "); // Here I want to wait till the new data had arrived

          //strcpy(arr_1, arr);

          if(strcmp(arr, "123456") == 0)
          {
            printf("\nPassword is correct");            
          }

        }    
    }
}

[ShubMane]

I want implement the logic as like it as it as follow like normal C code below. with 3 password attempt.

#include<stdio.h>
#include<string.h>

int main()
{
	char password[6];
	
	// 1st attempt
	printf("\nPlease enter the password : ");
	scanf("%s",&password);   // provides the wait state
	
	
	if(strcmp(password, "123456") == 0)
	{
		printf("\nPassword is correct");
	}
	
	if(strcmp(password, "123456") != 0)
	{	// 2nd attempt
		printf("\nPassword is not correct!!! please try again");
		printf("\nPlease enter the password : ");
		scanf("%s",&password); // provide the wait state
		
		
		if(strcmp(password, "123456") == 0)
		{
			printf("\nPassword is correct");
		}
		
		if(strcmp(password, "123456") != 0)
		{
			// 3rd attempt
			printf("\nPassword is not correct!!! please try again");
			printf("\nPlease enter the password : ");
			scanf("%s",&password); // provide the wait state
			
			if(strcmp(password, "123456") == 0)
			{
				printf("\nPassword is correct");
			}
			
			if(strcmp(password, "123456") != 0)
			{
				printf("\nYour all attempt had finished!! Please reset device");
			}
			
		}
	}
	return 0;
}

[ShubMane]

the above same type of logic I want to Implement in the nus data handler "Password with 3 attempt".

for that I want to add the wait state till the new data had arrives.

[ShubMane]

Please tell me how to write a wait state.