regarding BLE_APP_MULTILINK_CENTRAL_PCA10040_s132

[s_sen]

so i am trying to understand the code , and i would be really grateful if u help me . 

what i am trying to do is send data from one DK to multiple DK. i am not able to figure out where to send the data or read it from.  

SDK1 uploaded with  multilink_central and SDK2 is uploaded with ble_app_blinky (it works fine )

thank you 

ps- we are using SEGGER IDE , SDK BMD 300.

[Bjørn Kvaale]

Which sdk version are you currently using? v15.1? Have you taken a look at the documentation provided here?

[s_sen]

thank you for your reply

v15.0 and yes i have gone throught he infocentre, but its still a bit blurry.....

i just need to know what exactly is the data being transmitted (the frame configuration) ...

[Bjørn Kvaale]

Take a look at the button_event_handler() function in main.c of the multilink example. As soon as the user presses button 1, the led_status_send_to_all() function gets called:

static ret_code_t led_status_send_to_all(uint8_t button_action)
{
    ret_code_t err_code;

    for (uint32_t i = 0; i< NRF_SDH_BLE_CENTRAL_LINK_COUNT; i++)
    {
        err_code = ble_lbs_led_status_send(&m_lbs_c[i], button_action);
        if (err_code != NRF_SUCCESS &&
            err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
            err_code != NRF_ERROR_INVALID_STATE)
        {
            return err_code;
        }
    }
        return NRF_SUCCESS;

This function will iterate through all of the central links & call ble_lbs_led_status_send(), which will write the led status to the peripheral link. There are 8 button client instances that are created in the multilink central example (i.e. m_lbs_c). The sd_ble_gattc_write performs the write procedure inside the tx_buffer_process() at the end of ble_lbs_led_status_send(). See the ble_gattc.h header file for more information. Hope that helps!

[s_sen]

thank you , that helped sir

[s_sen]

so i am trying to broadcast my integer data like this , is it the correct way?

[Bjørn Kvaale]

Did you see the answer posted here? It is not possible to broadcast data to all links at once. You will need to handle them separately. As you can see from led_status_send_to_all(), the status is sent to all links one after another (not broadcasted). If you take a look at ble_lbs_led_status_send(), take a look at the variable tx_message_t * p_msg; The tx_message_t struct contains a write_req message, which contains the gattc_value message to write.

The status of the message is written in this line here:

p_msg->req.write_req.gattc_value[0]        = status;

You should not have to make any changes to tx_buffer_process.

[awneil]

Bjørn Kvaale said:

It is not possible to broadcast integer data

Surely, it's not just integer data - that applies to any data?

[Bjørn Kvaale]

My bad. I naturally meant all data, not just integer data. I have updated the comment. Thank you for the comment.