Merging LE Secure Connections Multirole Example and Ble App UART Example

[Anubhav]

Hi,

I am working on a project where I need to send and receive ASCII strings from my Central Device to the Peripheral Device. Before the communication starts there should be a bonding (paring) between the devices. The nRF52840 DK is used as a peripheral device and nRF Toolbox is used as a central device.  After the bond is established the text should be encrypted using the AES algorithm. Finally, the text sent should be displayed using UART.

the bonding and paring are done in example LE Secure Connections Multirole and the UART is done in the example Ble App UART so I wanted to merge both the files. Can anyone help me with this?

The tools and software used are listed here:

NRF52840 DK

SDK 15.2.0

Segger embedded studio for coding

nRF Toolbox version 2.0

[Anubhav]

Hi,

As I told earlier, now the bonding and pairing are working. I am able to send and receive strings from my central and peripheral device.

I needed a small help now.

Actually, I don't want to send strings from my nrf52840 board(via PUTTY). If I send a text from my central device to my peripheral I should get an automatic reply with some string.

Can you tell me where should I make changes to implement this?? 

[Anubhav]

Actually what I meant from my previous question is that only central device that is nRF Toolbox app should send strings and get an automatic reply from the peripheral that is the nRF52840 board.

[Anubhav]

Hi, I went through one of your post (link attached below).

https://devzone.nordicsemi.com/f/nordic-q-a/36397/how-to-send-data-from-nordic-nrf52840-to-ble-android-app-nrfconnect

Can you please tell me where and how to use ble_nus_string_send(&m_nus, data, sizeof(data)) in my code mentioned above to get a text from the nrf52840 board.

[Anubhav]

APP_TIMER_DEF(send_some_uart_data);    /**< Some timer */

void send_some_uart_data_handler(void * p_context)
{
    ret_code_t err_code;
    
    uint8_t string[] = "serial updated\n\r";
    uint16_t length = sizeof(string);
    
    do
    {
        
        err_code = ble_nus_string_send(&m_nus, string, &length);
        if ( (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) )
        {
            APP_ERROR_CHECK(err_code);
        }
    } while (err_code == NRF_ERROR_BUSY);    
}

void send_some_data_uart_init(void)
{
    app_timer_create(&send_some_uart_data,APP_TIMER_MODE_REPEATED, send_some_uart_data_handler);
    app_timer_start(send_some_uart_data, APP_TIMER_TICKS(1000), NULL);
}

// Call send_some_data_uart_init(); in main() to run send_some_uart_data_handler() at configured internal.

I added this part into my code for sending a fixed string from my nRF52840 board. But I get an error stating:

Output/ble_app_multirole_lesc_s140_pca10056 Release/Obj/main.o: In function `send_some_uart_data_handler':
1> C:\nRF5_SDK_15.2.0_9412b96\nRF5_SDK_15.2.0_9412b96\examples\ble_central_and_peripheral\experimental\ble_app_multirole_lesc/main.c:1386: undefined reference to `ble_nus_string_send'
Build failed

[Simon]

Lets continue the discussion in this thread.