hello everybody,
I need to send some data on the value attached with the notification:
/**@brief Function for adding the notify Level characteristic.
*
* @param[in] p_notify notify Service structure.
* @param[in] p_notify_init Information needed to initialize the service.
*
* @return NRF_SUCCESS on success, otherwise an error code.
*/
static uint32_t notification_char_add(ble_notify_t * p_notify, const ble_notify_init_t * p_notify_init)
{
uint32_t err_code;
ble_gatts_char_md_t char_md;
ble_gatts_attr_md_t cccd_md;
ble_gatts_attr_t attr_char_value;
ble_uuid_t ble_uuid;
ble_gatts_attr_md_t attr_md;
uint8_t initial_notification;
uint8_t encoded_report_ref[BLE_SRV_ENCODED_REPORT_REF_LEN];
uint8_t init_len;
// Add notify Level characteristic
if (p_notify->is_notification_supported)
{
memset(&cccd_md, 0, sizeof(cccd_md));
// According to notify_SPEC_V10, the read operation on cccd should be possible without
// authentication.
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
cccd_md.write_perm = p_notify_init->notification_char_attr_md.cccd_write_perm;
cccd_md.vloc = BLE_GATTS_VLOC_STACK;
}
memset(&char_md, 0, sizeof(char_md));
char_md.char_props.read = 1;
char_md.char_props.notify = (p_notify->is_notification_supported) ? 1 : 0;
char_md.p_char_user_desc = NULL;
char_md.p_char_pf = NULL;
char_md.p_user_desc_md = NULL;
char_md.p_cccd_md = (p_notify->is_notification_supported) ? &cccd_md : NULL;
char_md.p_sccd_md = NULL;
ble_uuid.type = p_notify->uuid_type;
ble_uuid.uuid = UUID_notify_CHAR;
memset(&attr_md, 0, sizeof(attr_md));
attr_md.read_perm = p_notify_init->notification_char_attr_md.read_perm;
attr_md.write_perm = p_notify_init->notification_char_attr_md.write_perm;
attr_md.vloc = BLE_GATTS_VLOC_STACK;
attr_md.rd_auth = 0;
attr_md.wr_auth = 0;
attr_md.vlen = 0;
initial_notification = p_notify_init->initial_notification;
memset(&attr_char_value, 0, sizeof(attr_char_value));
attr_char_value.p_uuid = &ble_uuid;
attr_char_value.p_attr_md = &attr_md;
attr_char_value.init_len = sizeof(uint8_t *);
attr_char_value.init_offs = 0 ;
attr_char_value.max_len = 26 ;
attr_char_value.p_value = &initial_notification;
err_code = sd_ble_gatts_characteristic_add(p_notify->service_handle, &char_md,
&attr_char_value,
&p_notify->notification_handles);
if (err_code != NRF_SUCCESS)
{
return err_code;
}
if (p_notify_init->p_report_ref != NULL)
{
// Add Report Reference descriptor
BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_REPORT_REF_DESCR);
memset(&attr_md, 0, sizeof(attr_md));
attr_md.read_perm = p_notify_init->notification_report_read_perm;
BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.write_perm);
attr_md.vloc = BLE_GATTS_VLOC_STACK;
attr_md.rd_auth = 0;
attr_md.wr_auth = 0;
attr_md.vlen = 0;
init_len = ble_srv_report_ref_encode(encoded_report_ref, p_notify_init->p_report_ref);
memset(&attr_char_value, 0, sizeof(attr_char_value));
attr_char_value.p_uuid = &ble_uuid;
attr_char_value.p_attr_md = &attr_md;
attr_char_value.init_len = init_len;
attr_char_value.init_offs = 0;
attr_char_value.max_len = attr_char_value.init_len;
attr_char_value.p_value = encoded_report_ref;
err_code = sd_ble_gatts_descriptor_add(p_notify->notification_handles.value_handle,
&attr_char_value,
&p_notify->report_ref_handle);
if (err_code != NRF_SUCCESS)
{
return err_code;
}
}
else
{
p_notify->report_ref_handle = BLE_GATT_HANDLE_INVALID;
}
return NRF_SUCCESS;
}
it works with me, but I have a problem the data size is variable, I need to change the maximum value of attribute : attr_char_value.max_len = 26 ;
to be able to send data without the garbage, otherwise I need a way not to send this garbage data :) :)
