/**@brief Function for adding the Heart Rate Measurement characteristic.
*
* @param[in] p_hrs Heart Rate Service structure.
* @param[in] p_hrs_init Information needed to initialize the service.
*
* @return NRF_SUCCESS on success, otherwise an error code.
*/
static uint32_t heart_rate_measurement_char_add(ble_hrs_t * p_hrs,
const ble_hrs_init_t * p_hrs_init)
{
simple_uart_putstring("add heart rate measurement");
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 encoded_initial_hrm[MAX_HRM_LEN];
memset(&cccd_md, 0, sizeof(cccd_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
cccd_md.write_perm = p_hrs_init->hrs_hrm_attr_md.cccd_write_perm;
cccd_md.vloc = BLE_GATTS_VLOC_STACK;
memset(&char_md, 0, sizeof(char_md));
char_md.char_props.notify = 1;
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 = &cccd_md;
char_md.p_sccd_md = NULL;
BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_HEART_RATE_MEASUREMENT_CHAR);
memset(&attr_md, 0, sizeof(attr_md));
attr_md.read_perm = p_hrs_init->hrs_hrm_attr_md.read_perm;
attr_md.write_perm = p_hrs_init->hrs_hrm_attr_md.write_perm;
attr_md.vloc = BLE_GATTS_VLOC_STACK;
attr_md.rd_auth = 0;
attr_md.wr_auth = 0;
attr_md.vlen = 1;
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 = hrm_encode(p_hrs, INITIAL_VALUE_HRM, encoded_initial_hrm);
attr_char_value.init_offs = 0;
attr_char_value.max_len = MAX_HRM_LEN;
attr_char_value.p_value = encoded_initial_hrm;
return sd_ble_gatts_characteristic_add(p_hrs->service_handle,
&char_md,
&attr_char_value,
&p_hrs->hrm_handles);
}
uint32_t ble_hrs_heart_rate_measurement_send(ble_hrs_t * p_hrs, uint16_t heart_rate)
{
uint32_t err_code;
// Send value if connected and notifying
if (p_hrs->conn_handle != BLE_CONN_HANDLE_INVALID)
{
uint8_t encoded_hrm[MAX_HRM_LEN];
uint16_t len;
uint16_t hvx_len;
ble_gatts_hvx_params_t hvx_params;
len = hrm_encode(p_hrs, heart_rate, encoded_hrm);
hvx_len = len;
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = p_hrs->hrm_handles.value_handle;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
hvx_params.offset = 0;
hvx_params.p_len = &hvx_len;
hvx_params.p_data = encoded_hrm;
err_code = sd_ble_gatts_hvx(p_hrs->conn_handle, &hvx_params);
if ((err_code == NRF_SUCCESS) && (hvx_len != len))
{
err_code = NRF_ERROR_DATA_SIZE;
}
}
else
{
err_code = NRF_ERROR_INVALID_STATE;
}
return err_code;
}
