Hello,
After a characteristic (with write and notify properties) is written, the nRF51 sends some data through the UART. Then it receives data, also through the UART, and send a characteristic notification using sd_ble_gatts_hvx() function.
However this function never return. Since I don't have access to its code, can someone tell me what's going wrong?
This is how I add the characteristic:
static uint32_t vm_char_add(ble_pks_t * p_pks, const ble_paykey_init_t * p_pks_init)
{
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;
memset(&cccd_md, 0, sizeof(cccd_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);
cccd_md.vloc = BLE_GATTS_VLOC_STACK;
memset(&char_md, 0, sizeof(char_md));
char_md.char_props.read = 0;
char_md.char_props.write = 1;
char_md.char_props.write_wo_resp = 0;
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.type = p_pks->uuid_type;
ble_uuid.uuid = BLE_UUID_PKS_VM_CHAR;
memset(&attr_md, 0, sizeof(attr_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&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 = sizeof(uint8_t);
attr_char_value.init_offs = 0;
attr_char_value.max_len = BLE_PKS_MAX_DATA_LEN;
attr_char_value.p_value = NULL;
return sd_ble_gatts_characteristic_add(p_pks->service_handle,
&char_md,
&attr_char_value,
&p_pks->vm_handles);
}
And this is how I send a notification:
static uint32_t send_notification(ble_pks_t *p_pks, uint16_t ch_value_handle, uint8_t *p_data, uint16_t length)
{
ble_gatts_hvx_params_t hvx_params;
VERIFY_PARAM_NOT_NULL(p_pks);
if ((p_pks->conn_handle == BLE_CONN_HANDLE_INVALID))
{
return NRF_ERROR_INVALID_STATE;
}
if (length > BLE_PKS_MAX_DATA_LEN)
{
return NRF_ERROR_INVALID_PARAM;
}
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = ch_value_handle;
hvx_params.p_data = p_data;
hvx_params.p_len = &length;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
uint32_t err_code = sd_ble_gatts_hvx(p_pks->conn_handle, &hvx_params);
if(err_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("failed to notify %d\n",err_code);
}
return err_code;
}
Since the code hangs (infinite loop somewhere?) I end up losing the connection and I can only recover the nRF51 by reprograming / resetting it.
Why?
