How to compare the received data over able to the specific value...

[ShubMane]

Dear team,

1. I am using the Ble_app_uart example from the SDK.

2. I had received the data successfully from the nrf_connect app.

3. Once the data was received over a ble after that I want to compare that data with string & want to perform an action accordingly.

4. if there is any example in sdk then please let me know with the above criteria.

5. please help me above senario.

[Karl Ylvisaker]

Hello,

The standard behavior of the example is just to forward any data received over the NUS service to the UART peripheral. This happens as part of the BLE_NUS_EVT_RX_DATA event handling in the nus_data_handler function. If you wish to modify the example to do something else with this data, or check it for some special sequence, you could implement this as part of the BLE_NUS_EVT_RX_DATA event as well / instead of the existing functionality.

Best regards,
Karl

[ShubMane]

Hi Karl,

I just want to store the received data into the variable which is coming from the nrf_connect app

[ShubMane]

So once the data is stored in the variable so I can perform the action accordingly.

[ShubMane]

Respected Karl,

Please update

I just want to store the data which is coming from the nrf_connect app(master) to the slave (PCA10040)

as well as it's going printed on the terminal (putty). 

for example, if I am sending the data "123456" from nrf connect app that data i want to store into the variable

[Karl Ylvisaker]

Yes, you may do so in the BLE_NUS_EVT_RX_DATA event that I mentioned in my previous comment.
The data is retrieved byte-for-byte in the following section of the event handler:

..
        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);
        }
..

You may remove the app_uart_put call if you do not wish for it to be sent to the UART peripheral, and then instead read the p_evt->params.rx_data.p_data into another variable for later processing.

Best regards,
Karl

[ShubMane]

Hi Karl,

Thanks for the help.

every single time I am sending the new data from NRF connect app.

So Could u please tell me

And I want to wait till the new data had arrived

[ShubMane]

Hi Karl,

Thanks for the help.

every single time I am sending the new data from NRF connect app.

So Could u please tell me

And I want to wait till the new data not had arrived.

and once that data had arrived I want to out of that loop.

[ShubMane]

How to wait till the new data had come from NRF connect app.

[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 : "); // after this I want to wait till the new data had arrived.

          //strcpy(arr_1, arr);

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

        }    
    }
}

[ShubMane]

hi Karl,

I want to implement the logic as below in the normal c code in nus data handler.

scanf provides the wait state till the user puts the data.

in the same way, I want to put the wait state till the nrf_connect app sends the data to slave (nus_data_handler).

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

int main()
{
	char password[6];
	
	// 1st attempt
	printf("\nPlease enter the password : ");
	scanf("%s",&password); // 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); // 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); // 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]

Dear team,

Please update on priority..