SERVICE HANDLE OF NUS

[Herb Gingold]

I am trying to determine the service handle of the nus example, to be able to verify that the central has turned on notifications.

I am using the sd_ble_gatts_value_get(m_conn_handle,  , &pval); function to read the attribute value and then test if for notifications enabled, but for the life of me cannot determine what it is?

I have found the characteristic add and found the p_nus->service_handle, but the reference is not valid, how do I access this handle to be able to do this test?

Herb

[Herb Gingold]

No one responded to this, but I found the handle, really obscure documentation and beyond sketchy examples.

Now that I found this, and got it to compile, it does not return a value, what am I doing wrong here:

if ( Device_Connected && filter_pointer == FILTER_LENGTH)
{
uint16_t length = 7u;
uint8_t p_bull = NULL;
ble_gatts_value_t pval;
*pval.p_value = p_bull;

err_code = sd_ble_gatts_value_get(m_conn_handle, m_nus.tx_handles.cccd_handle, &pval);
uint8_t p_temp = *pval.p_value;
if ( p_temp&0x01 )
{
do{
err_code = ble_nus_data_send(&m_nus, ble_buffer, &length, m_conn_handle);
if ((err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_NOT_FOUND))
{
APP_ERROR_CHECK(err_code);
}
} while (err_code == NRF_ERROR_RESOURCES);
}
}
if(filter_pointer == FILTER_LENGTH){filter_pointer = false;}
}

[jing]

you can just handle BLE_NUS_EVT_COMM_STARTED (on notification enabled) and BLE_NUS_EVT_COMM_STOPPED (on notification disabled) event type from your registered nus callback.

jing

[Herb Gingold]

Jing, thank you for your reply, can you show an example of an implementation, I cannot determine what to do at my current nordic skill level from your comment.

Herb

[jing]

\nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\ble_app_uart\main.c

static void nus_data_handler(ble_nus_evt_t * p_evt)
{
    if (p_evt->type == BLE_NUS_EVT_COMM_STARTED)
    {
        /* TX Characteristic notification enabled */
    }
    else if (p_evt->type == BLE_NUS_EVT_COMM_STOPPED)
    {
        /* TX Characteristic notification disabled */
    }

    :

jing