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.

[Amanda Hsieh]

Hi, 

Are you using NCS or nRF5SDK?

-Amanda

[ShubMane]

Hi team,

I am using the nRF52DK module PCA10040 board

[Amanda Hsieh]

Hi, 

Sorry for the delay due to the weekend. 

Since sending data from central/phone each time will trigger the nus_data_handler, I think you maybe could a global variable to count the failing input. 

-Amanda 

[ShubMane]

Hi amenda,

I had declare the local variable in the nus data handler

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];
        }

        flag = 0;

        // flag = 0; // password is correct
        // flag = 1; // password is incorrect

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

          if(strcmp(arr, "123456") != 0)
          {
            printf("\nPassword is incorrect!!! Please try again");
            flag = 1;
            attempt++;
          }    
        }

        if(flag == 1 && attempt == 1)
        {
          printf("\nPassword : "); // Here I want to wait till the new data had arrive

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

        // for n number of 
    }
}

[ShubMane]

I want to implemet the logic 

1. 3 times password is wrong then I want to show "please reset the device"

[Amanda Hsieh]

You should try to run and debug by yourself. Please be aware that the risk might be as my colleague mentioned in this post. 

-Amanda

[ShubMane]

Dear amenda,

Please let me know how to provide the wait state till the data aries.

[Amanda Hsieh]

Please see my colleague explained in this post. 

-Amanda