/**@brief Function for handling characteristic discovery response.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
*/
static void on_characteristic_discovery_rsp(ble_db_discovery_t * const p_db_discovery,
const ble_gattc_evt_t * const p_ble_gattc_evt)
{
uint32_t err_code;
ble_gatt_db_srv_t * p_srv_being_discovered;
bool perform_desc_discov = false;
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
{
const ble_gattc_evt_char_disc_rsp_t * p_char_disc_rsp_evt;
p_char_disc_rsp_evt = &(p_ble_gattc_evt->params.char_disc_rsp);
// Find out the number of characteristics that were previously discovered (in earlier
// characteristic discovery responses, if any).
uint8_t num_chars_prev_disc = p_srv_being_discovered->char_count;
// Find out the number of characteristics that are currently discovered (in the
// characteristic discovery response being handled).
uint8_t num_chars_curr_disc = p_char_disc_rsp_evt->count;
// Check if the total number of discovered characteristics are supported by this module.
if ((num_chars_prev_disc + num_chars_curr_disc) <= BLE_GATT_DB_MAX_CHARS)
{
// Update the characteristics count.
p_srv_being_discovered->char_count += num_chars_curr_disc;
}
else
{
// The number of characteristics discovered at the peer is more than the supported
// maximum. This module will store only the characteristics found up to this point.
p_srv_being_discovered->char_count = BLE_GATT_DB_MAX_CHARS;
}
uint32_t i;
uint32_t j;
for (i = num_chars_prev_disc, j = 0; i < p_srv_being_discovered->char_count; i++, j++)
{
p_srv_being_discovered->charateristics[i].characteristic =
p_char_disc_rsp_evt->chars[j];
p_srv_being_discovered->charateristics[i].cccd_handle = BLE_GATT_HANDLE_INVALID;
}
ble_gattc_char_t * p_last_known_char;
p_last_known_char = &(p_srv_being_discovered->charateristics[i - 1].characteristic);
// If no more characteristic discovery is required, or if the maximum number of supported
// characteristic per service has been reached, descriptor discovery will be performed.
if (
!is_char_discovery_reqd(p_db_discovery, p_last_known_char) ||
(p_srv_being_discovered->char_count == BLE_GATT_DB_MAX_CHARS)
)
{
perform_desc_discov = true;
}
else
{
// Update the current characteristic index.
p_db_discovery->curr_char_ind = p_srv_being_discovered->char_count;
// Perform another round of characteristic discovery.
err_code = characteristics_discover(p_db_discovery);
if (err_code != NRF_SUCCESS)
{
p_db_discovery->discovery_in_progress = false;
discovery_error_evt_trigger(p_db_discovery, err_code);
return;
}
}
}
else
{
// The previous characteristic discovery resulted in no characteristics.
// descriptor discovery should be performed.
perform_desc_discov = true;
}
if (perform_desc_discov)
{
bool raise_discov_complete;
p_db_discovery->curr_char_ind = 0;
err_code = descriptors_discover(p_db_discovery, &raise_discov_complete);
if (err_code != NRF_SUCCESS)
{
p_db_discovery->discovery_in_progress = false;
discovery_error_evt_trigger(p_db_discovery, err_code);
return;
}
if (raise_discov_complete)
{
// No more characteristics and descriptors need to be discovered. Discovery is complete.
// Send a discovery complete event to the user application.
DB_LOG("[DB]: Discovery of service with UUID 0x%x completed with success for Connection"
" handle %d\r\n", p_srv_being_discovered->srv_uuid.uuid,
p_db_discovery->conn_handle);
discovery_complete_evt_trigger(p_db_discovery, true);
on_srv_disc_completion(p_db_discovery);
}
}
}
/**@brief Function for handling descriptor discovery response.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
*/
static void on_descriptor_discovery_rsp(ble_db_discovery_t * const p_db_discovery,
const ble_gattc_evt_t * const p_ble_gattc_evt)
{
const ble_gattc_evt_desc_disc_rsp_t * p_desc_disc_rsp_evt;
ble_gatt_db_srv_t * p_srv_being_discovered;
if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle)
{
return;
}
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_desc_disc_rsp_evt = &(p_ble_gattc_evt->params.desc_disc_rsp);
ble_gatt_db_char_t * p_char_being_discovered =
&(p_srv_being_discovered->charateristics[p_db_discovery->curr_char_ind]);
if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
{
// The descriptor was found at the peer.
// If the descriptor was a CCCD, then the cccd_handle needs to be populated.
uint32_t i;
// Loop through all the descriptors to find the CCCD.
for (i = 0; i < p_desc_disc_rsp_evt->count; i++)
{
if (
p_desc_disc_rsp_evt->descs[i].uuid.uuid ==
BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG
)
{
p_char_being_discovered->cccd_handle = p_desc_disc_rsp_evt->descs[i].handle;
break;
}
}
}
bool raise_discov_complete = false;
if ((p_db_discovery->curr_char_ind + 1) == p_srv_being_discovered->char_count)
{
// No more characteristics and descriptors need to be discovered. Discovery is complete.
// Send a discovery complete event to the user application.
raise_discov_complete = true;
}
else
{
// Begin discovery of descriptors for the next characteristic.
uint32_t err_code;
p_db_discovery->curr_char_ind++;
err_code = descriptors_discover(p_db_discovery,
&raise_discov_complete,
p_ble_gattc_evt->conn_handle);
if (err_code != NRF_SUCCESS)
{
p_db_discovery->discovery_in_progress = false;
// Error with discovering the service.
// Indicate the error to the registered user application.
discovery_error_evt_trigger(p_db_discovery,
err_code,
p_ble_gattc_evt->conn_handle);
m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle;
return;
}
}
if (raise_discov_complete)
{
DB_LOG("[DB]: Discovery of service with UUID 0x%x completed with success for Connection"
"handle %d\r\n", p_srv_being_discovered->srv_uuid.uuid,
p_ble_gattc_evt->conn_handle);
discovery_complete_evt_trigger(p_db_discovery,
true,
p_ble_gattc_evt->conn_handle);
on_srv_disc_completion(p_db_discovery,
p_ble_gattc_evt->conn_handle);
}
}
