How do I know when a connection was established and how do I use the relavent struct?

[Erik]

8.0, multilink example, peripheral, s110 softdevice.

By walking through sections of codes and doing some research, I reckon if a connection were being established after advertising, the callback "ble_evt_handler()" will be called upon, and a "p_ble_evt" type struct will be passed to it, which contains the "connection established" event value.

My question is, all I need is a variable or a struct that tells me the connections was established, so I can put the variable or something of similar nature in this case inside an "if () " statement, as in "if (is_conn_set==yes)".

So, would it be problematic if I put a

connection_established_flag = YES;

at the end of

"case BLE_GAP_EVT_CONNECTED:"

inside the "dm_ble_evt_handler()" function?

Or would you rather suggest a better idea? Thanks for your help in advance.

I hope I didn't erroneously identify the things that I wanted.

[Marco Russi]

Hi, your idea should work fine. I did the same on a my application. I suggest to define the flag static volatile as below:

static volatile bool device_connected = false;

You can find it here:

github.com/.../conn_nus_p.c

switch (p_ble_evt->header.evt_id){

    case BLE_GAP_EVT_CONNECTED:
		/* device is connected now */
		device_connected = true;
        break;


    case BLE_GAP_EVT_DISCONNECTED:
		/* device is not connected now */
		device_connected = false;
        break;}

[Alex]

Another option is to use connection handle

case BLE_GAP_EVT_CONNECTED:
    m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

    break;

case BLE_GAP_EVT_DISCONNECTED:
    m_conn_handle = BLE_CONN_HANDLE_INVALID;

[Marco Russi]

Thanks for reminding me this approach. ;)

[tesc]

This approach is also used by most SDK examples.

[Erik]

Thank you for your answers and kind attention!