P_evt_write handle doesn't match

[julienh]

Hi,

I have a basic characteristic on which I would like to write. I did this on so many projects without any problem but here, the value handle of my characteristic doesn't match with the expected one.

static void on_write(ble_acs_t * p_acs, ble_evt_t * p_ble_evt)
{
  ble_gatts_evt_write_t * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
  NRF_LOG_ERROR("p_evt_write handle %d  reset handle %d\n",p_evt_write->handle, p_acs->reset_handles.value_handle);
  if ( (p_evt_write->handle == p_acs->reset_handles.value_handle) && (p_evt_write->len == ACCEL_RESET_CHAR_MAX_LEN) ) {

    if(p_evt_write->data[0] == 0x01)
    {
        reset_flag = true;
    }

  } 
  
}

Example : p_evt_write_handle is equal to 24 and p_acs->reset_handles.value_handle is equal to 117. Furthermore, this value is really weird because it seems to be too high. I only have 1 service and 3 characteristics so 117 ...

Any idea? I think that I missed something

[Petter Myhre]

Sounds strange that p_evt_write->handle is 24 when you 1 service and 3 characteristics, but what handle do you expect? The only thing I can think of straight away is that this is not actually a write event, but some other event, you could double check that p_ble_evt->header.evt_id is actually BLE_GATTS_EVT_WRITE.

I'm not sure why p_acs->reset_handles.value_handle is 117 either, but as you say it sounds incorrect. But this is forwarded from main.c isn't it? You have something like ble_acs_on_ble_evt(&m_acs, p_ble_evt); in ble_evt_dispatch() in main? Are you sure the handle is actually set? It is typically set in services_init(). Have you checked the value of p_acs->reset_handles.value_handle after it is called? If it is 117 I guess you have found the culprit. If not, you should check why this is set to 117 at a later time in your program.

[julienh]

Hi Petter,

Thanks for your reply.

I'm checking that this is a GATTS_EVT_WRITE before sending to my on_write function which is called.

void ble_acs_on_ble_evt(ble_acs_t * p_acs, ble_evt_t * p_ble_evt)
{
  if ((p_acs == NULL) || (p_ble_evt == NULL)) {
    return;
  }

  switch (p_ble_evt->header.evt_id) {
  case BLE_GAP_EVT_CONNECTED:
    on_connect(p_acs, p_ble_evt);
    break;

  case BLE_GAP_EVT_DISCONNECTED:
    on_disconnect(p_acs, p_ble_evt);
    break;

  case BLE_GATTS_EVT_WRITE:
  on_write(p_acs, p_ble_evt);
  break;

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

Everything seems to be good to me on ble_evt_dispatch.

I will create a case and send you the whole project. Tha will be simpler do discuss.

[Petter Myhre]

Yes please :)

[julienh]

Done (ps : the user name is different -> julienhmt).

Thank you for your help

[Petter Myhre]

0x18 or 24 is the correct handle for p_acs->reset_handles.value_handle()

I tried to debug the project here, and I get 0x18 for both.