How to switch from connectable mode to beacon mode after disconnection

RE: How to switch from connectable mode to beacon mode after disconnection

Hung Bui — Fri, 22 Apr 2022 08:19:05 GMT

Hi Vishnu,

You are mixing ble_advertising and the calling sd_ble_gap_adv directly.
I would suggest to follow exactly what I did in the example. Only use sd_ble_gap_adv API and not the ble_advertising module.
Note that I only used one advertising_start() function.

RE: How to switch from connectable mode to beacon mode after disconnection

VISHNU D PAI — Mon, 11 Apr 2022 10:07:58 GMT

static void advertising_beacon_init(void)
{
    uint32_t      err_code;

    ble_advdata_t advdata1;
    ble_advdata_t srdata1;


    memset(&advdata1, 0, sizeof(advdata1));

    advdata1.name_type          = BLE_ADVDATA_NO_NAME;
    advdata1.include_appearance = true;
    advdata1.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    memset(&srdata1, 0, sizeof(srdata1));
    srdata1.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    srdata1.uuids_complete.p_uuids  = m_adv_uuids;

    err_code = ble_advdata_encode(&advdata1, m_adv_data1.adv_data1.p_data1, &m_adv_data1.adv_data1.len1);
    APP_ERROR_CHECK(err_code);

    err_code = ble_advdata_encode(&srdata1, m_adv_data1.scan_rsp_data1.p_data1, &m_adv_data1.scan_rsp_data1.len1);
    APP_ERROR_CHECK(err_code);
    ble_gap_adv_params_t adv_params1;

    // Set advertising parameters.
    memset(&adv_params1, 0, sizeof(adv_params1));

    adv_params1.primary_phy     = BLE_GAP_PHY_1MBPS;
    adv_params1.duration        = APP_ADV_DURATION;
    adv_params1.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
    adv_params1.p_peer_addr     = NULL;
    adv_params1.filter_policy   = BLE_GAP_ADV_FP_ANY;
    adv_params1.interval        = APP_ADV_INTERVAL;

    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle1, &m_adv_data1, &adv_params1);
    //APP_ERROR_CHECK(err_code);
   
    }


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    ret_code_t             err_code;
    ble_advertising_init_t init;

   
    
   // ble_advdata_manuf_data_t manuf_specific_data;
    //manuf_specific_data.company_identifier = APP_COMPANY_IDENTIFIER;
   
    memset(&init, 0, sizeof(init));
    
    ble_advdata_manuf_data_t                  manuf_data; //Variable to hold manufacturer specific data
    uint8_t data[]                            = {0x30,0x5F,0x1E,0xAe,0xEC,0x5E,0xE9}; //Our data to advertise
    manuf_data.company_identifier             =  0x4D4B; //Nordics company ID
    //manuf_data.hardware_type                  =  0x3;
    //manuf_data.bind_tag                       =  0x0;
    manuf_data.data.p_data                    = data;
    manuf_data.data.size                      = sizeof(data);
    init.advdata.p_manuf_specific_data        = &manuf_data;

    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;
    init.advdata.uuids_more_available.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.uuids_more_available.p_uuids  = m_adv_uuids;
    
    //init.advdata.p_manuf_specific_data   = &manuf_specific_data;

    init.config.ble_adv_on_disconnect_disabled = true;
    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;

    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);



    
}

The code above is for advertising_init and advertising_beacon_init.

static void advertising_beacon_start(void)
{
    ret_code_t           err_code;

    

    err_code = sd_ble_gap_adv_start(m_adv_handle1, APP_BLE_CONN_CFG_TAG);
    NRF_LOG_INFO("BEACON_STARTED");
    APP_ERROR_CHECK(err_code);
    

}


/**@brief Function for starting advertising.
 */
static void advertising_start(bool erase_bonds)
{
    if (erase_bonds == true)
    {
        delete_bonds();
        // Advertising is started by PM_EVT_PEERS_DELETED_SUCEEDED event
    }
    else
    {
        ret_code_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);

        APP_ERROR_CHECK(err_code);
    }
}

this code is for advertising_start and advertising_beacon_start.

[quote userid="2121" url="~/f/nordic-q-a/86473/how-to-switch-from-connectable-mode-to-beacon-mode-after-disconnection/362489#362489"]ble_app_blinky_beacon.zip[/quote]

this example was really helpful in understanding the fundamentals, but still I am not able switch from connectable to beacon mode in my project. When I disconnect the advertisement goes back to connectable rather than going into beacon mode.

static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    ret_code_t err_code = NRF_SUCCESS;
    bool erase_bonds;
    //pm_handler_secure_on_connection(p_ble_evt);
   
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected.");
            sd_ble_gap_adv_stop(&m_advertising);
            app_timer_stop(m_adv_data_update_timer);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            advertising_beacon_init();
            advertising_beacon_start();
            NRF_LOG_INFO("beacon_started");

Please see the code and give some light!!!

RE: How to switch from connectable mode to beacon mode after disconnection

Hung Bui — Fri, 08 Apr 2022 06:53:51 GMT

Hi Vishnu,

I'm sorry here is the file.

devzone.nordicsemi.com/.../ble_5F00_app_5F00_blinky_5F00_beacon.zip

RE: How to switch from connectable mode to beacon mode after disconnection

VISHNU D PAI — Thu, 07 Apr 2022 16:27:35 GMT

[quote userid="2121" url="~/f/nordic-q-a/86473/how-to-switch-from-connectable-mode-to-beacon-mode-after-disconnection/362415#362415"]Please find the example attached.[/quote]

I can't see the attached example. Can you attach the example once again!!

RE: How to switch from connectable mode to beacon mode after disconnection

Hung Bui — Thu, 07 Apr 2022 15:07:11 GMT

Hi ,

Please find the example attached. See how I added the advertising_init_beacon() with

adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_SCANNABLE_UNDIRECTED;

and calling it inside BLE_GAP_EVT_DISCONNECTED event.

When you see something doesn't work please try to debug it. You can use the UART log to see if there is any assert. And you can add DEBUG into the project's preprocessor symbols to have more information about the assert.

RE: How to switch from connectable mode to beacon mode after disconnection

VISHNU D PAI — Thu, 07 Apr 2022 10:29:42 GMT

void advertising_beacon_start(bool erase_bonds)
{

   if (erase_bonds == true)
    {
        delete_bonds();
        // Advertising is started by PM_EVT_PEERS_DELETED_SUCEEDED event
    }
    else
    {
        ret_code_t err_code;

      err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
      APP_ERROR_CHECK(err_code);

      err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
      APP_ERROR_CHECK(err_code); 

    }
    
}

This is the advertising_beacon_start function and this is called in BLE_GAP_EVT_DISCONNECTED as follows

 
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected.");
            
             advertising_beacon_start(erase_bonds);
             
            // LED indication will be changed when advertising starts.
            break;

Please can you give a light on what is wrong here. If possible can you give a similiar example on how to tackle this problem.

[quote userid="2121" url="~/f/nordic-q-a/86473/how-to-switch-from-connectable-mode-to-beacon-mode-after-disconnection/362214#362214"]Please get familiar with how you can stop and re-start advertising.[/quote]

can you give an example or link on how to familiarize with the same

RE: How to switch from connectable mode to beacon mode after disconnection

Hung Bui — Thu, 07 Apr 2022 07:22:07 GMT

Hi Vishnu,

Please provide the code you used. I don't know what you have inside advertising_beacon_start ().
Please get familiar with how you can stop and re-start advertising.

RE: How to switch from connectable mode to beacon mode after disconnection

VISHNU D PAI — Wed, 06 Apr 2022 17:07:56 GMT

I have tried implementing what you have suggested, but after disconnection it stops advertising rather than going to beacon advertising mode. I have added an advertising_beacon_init function and advertising_beacon_start function. Inside the BLE_GAP_EVT_DISCONNECTED I called the advertising_beacon_start function to start beacon mode. Is this the right way to proceed or is there anything I need to do extra.

RE: How to switch from connectable mode to beacon mode after disconnection

Hung Bui — Mon, 04 Apr 2022 08:20:11 GMT

Hi Vishnu,

What you need to do is in advertising_init() you need to set:

init.config.ble_adv_on_disconnect_disabled=true.

This will disable the feature to start advertising automatically when disconnect.

Then after that you can write your own code in the BLE_GAP_EVT_DISCONNECTED event handler inside ble_evt_handler() function in main.c to start advertising in beacon mode. I assume you are planning to do non-connectable advertising. Please follow what we have in the beacon example.

RE: How to switch from connectable mode to beacon mode after disconnection

VISHNU D PAI — Sat, 02 Apr 2022 05:43:11 GMT

[quote userid="2121" url="~/f/nordic-q-a/86473/how-to-switch-from-connectable-mode-to-beacon-mode-after-disconnection/361270#361270"]Could you please let us know the SDK you are using[/quote]

I am currently using nRF5 SDK and working on Proximity example from ble_pheripheral. Here I wanted to change the advertising to beacon mode when the app gets disconnected from the nRF52 DK.

[quote userid="2121" url="~/f/nordic-q-a/86473/how-to-switch-from-connectable-mode-to-beacon-mode-after-disconnection/361270#361270"]I have a blog here about advertising that might be useful for you[/quote]

this blog is based on nRF-connect-SDK, which is not what I need. Can you give some example based on nRF5 SDK.

[quote userid="2121" url="~/f/nordic-q-a/86473/how-to-switch-from-connectable-mode-to-beacon-mode-after-disconnection/361270#361270"]Have you designed how should the device return to connectable advertising after it start non-connectable advertising ? [/quote]

Can you provide some example based on the same.

RE: How to switch from connectable mode to beacon mode after disconnection

Hung Bui — Fri, 01 Apr 2022 14:27:24 GMT

Hi Vishnu,

Could you please let us know the SDK you are using ?

Have you get your self familiar with how to do connectable advertising and non-connectable advertising ?

Have you designed how should the device return to connectable advertising after it start non-connectable advertising ?

I have a blog here about advertising that might be useful for you: https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/building-a-ble-application-on-ncs-comparing-and-contrasting-to-softdevice-based-ble-applications