BLE_NUS_C_EVT_NUS_TX_EVT has handle of 0xffff

[syc776]

I have following problem:

I am using a multilink NUS Central. With one peripheral connection everything works fine. But when make a second connection I sometimes get an error when I try to send data back in received event.

In ble_nus_c_evt_handler event with event type BLE_NUS_C_EVT_NUS_TX_EVT the p_ble_nus_c sometimes has an invalid connection handle (0xFFFF).

If I try to send data back I get following warning: <warning> ble_nus_c: Connection handle invalid.

How is this possible? I am assigning the handles with  ble_nus_c_handles_assign on discovery complete.

Does anyone know about this issue?

[awneil]

syc776 said:

I am assigning the handles

Surely, the SoftDevice assigns the handle, and advises it in the 'Connected' event ?

[syc776]

yes I am assigning the handles with  ble_nus_c_handles_assign on discovery complete

void ble_nus_c_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{
    ble_nus_c_t * p_ble_nus_c = (ble_nus_c_t *)p_context;

    if ((p_ble_nus_c == NULL) || (p_ble_evt == NULL))
    {
        return;
    }

    if ( (p_ble_nus_c->conn_handle != BLE_CONN_HANDLE_INVALID)
       &&(p_ble_nus_c->conn_handle != p_ble_evt->evt.gap_evt.conn_handle)
       )
    {
        return;
    }

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GATTC_EVT_HVX:
						
            on_hvx(p_ble_nus_c, p_ble_evt);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            if (p_ble_evt->evt.gap_evt.conn_handle == p_ble_nus_c->conn_handle
                    && p_ble_nus_c->evt_handler != NULL)
            {
                ble_nus_c_evt_t nus_c_evt;

                nus_c_evt.evt_type = BLE_NUS_C_EVT_DISCONNECTED;

                p_ble_nus_c->conn_handle = BLE_CONN_HANDLE_INVALID;
                p_ble_nus_c->evt_handler(p_ble_nus_c, &nus_c_evt);
            }
            break;

        default:
            // No implementation needed.
            break;
    }
}

p_ble_evt->evt.gap_evt.conn_handle=0xffff

[Edvin]

hehe. Which one?

[syc776]

if ( (p_ble_nus_c->conn_handle != BLE_CONN_HANDLE_INVALID)
&&(p_ble_nus_c->conn_handle != p_ble_evt->evt.gap_evt.conn_handle)
)
{
return;
}

[Edvin]

ok. and which one is false? I assume, based on the topic of this ticket that it is the p_ble_nus_c->conn_handle which is BLE_CONN_HANDLE_INVALID.

Did you check the conn_handle in the function on_hvx() as I suggested?

EDIT:

Sorry. Both return true, of course. '&&'.

But what is the conn_handle in on_hvx() in ble_nus_c.c?

[syc776]

the program can not reach on_hvx()

[Edvin]

Then it is not a notification event, but some other type of event. You need to send a notification from the other device in the connection to trigger the on_hvx() event. By setting a breakpoint in this function, you will not stop the softdevice until it is the correct event.

Did you try to send a notification from the other device? The device running ble_app_uart?

[syc776]

yes. ble_app_uart

[Edvin]

Edvin said:

Did you try to send a notification from the other device? The device running ble_app_uart?