[NRF51822] Function to check if BLE is connected or not

[Nick]

Is there a function within the nRF51822 SDK to check if BLE is connected or not (or to check general BLE connection state)?

Thanks.

[Balaji Srinivasan]

Hi there,

Right now there is no function for this in the SDK. The SDK applications and libraries use the BLE_GAP_EVT_CONNECTED and BLE_GAP_EVT_DISCONNECTED events triggered by the SoftDevice to update the link status. If you are interested, you may refer to the functions on_connect, on_disconnect and ble_hrs_sensor_contact_supported_set in ble_hrs.c to see how this is done.

Cheers, Balaji

[Chris Lovett]

I think you are supposed to handle the BLE events and remember the state your self. You can register to receive these events using softdevice_ble_evt_handler_set(ble_evt_dispatch) where your ble_evt_dispatch function looks like this :

static void ble_evt_dispatch(ble_evt_t * p_ble_evt) { switch (p_ble_evt->header.evt_id) { case BLE_GAP_EVT_CONNECTED: connected = true; break;

    case BLE_GAP_EVT_DISCONNECTED:
        connected = false;
        break;
        
    default:
        break;
}

}

[Nick]

Thanks - this is actually how I am doing it currently :) I'll continue to do it this way.

[scytulip]

Hi, Nick,

Not necessary to set a flag for this purpose. You should have a connection handle for the BLE operation (e.g. m_conn_handle), which is used in sd_ble_gap_disconnect(m_conn_handle, ...)

if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
{
	/* BLE is connected. Do something. */
} else
{
	/* BLE is not connected. Do something. */
}