STMWB05xZ Enable CTE

[atrujillo]

Hi,

I am working on a project which will require a connectionless CTE to be added to the advertisement. From what I understand, there are not currently any examples of a configured CTE beacon. What would be the best example project to modify to create a connectionless CTE beacon? Are there any examples anywhere floating around that I am unaware of? Or could someone point me in the right dire

[STTwo-32]

Hello @atrujillo 

STM32WB05 devices support standard Bluetooth LE Direction Finding Features and, as consequence, both connection and connection less mode.
Youl could refer to the related Bluetooth LE stack v4.x programming manual available on ST web site:https://www.st.com/resource/en/programming_manual/pm0274-bluetooth-low-energy-stack-v4x-programming-guidelines-stmicroelectronics.pdf
Section 2.11 Direction finding

Associated commands and events are documented on related Application Note: https://www.st.com/resource/en/application_note/an6142-introduction-to-stm32wb0-bluetooth-low-energy-wireless-interface-stmicroelectronics.pdf

Best regards

STTwo-32

[atrujillo]

I have some code here for configuring a beacon. However, it doesn't seem to correctly configure the CTE. The functions all return BLE_STATUS_SUCCESS, but when sniffing the packets using wireshark, they do not seem to have a CTE attached. They do look like extended periodic advertising packets, but I do not see a CTE.

  Advertising_Set_Parameters_t Advertising_Set_Parameters;
  tBleStatus ret = BLE_STATUS_SUCCESS;

  uint8_t b_index = 0;
  extended_beacon[b_index] = 0x02;
  extended_beacon[++b_index] = AD_TYPE_FLAGS;
  extended_beacon[++b_index] = FLAG_BIT_LE_GENERAL_DISCOVERABLE_MODE | FLAG_BIT_BR_EDR_NOT_SUPPORTED;
  extended_beacon[++b_index] = strlen(ext_beacon_name) + 1;
  extended_beacon[++b_index] = AD_TYPE_COMPLETE_LOCAL_NAME;

  memcpy(&extended_beacon[++b_index], &ext_beacon_name, strlen(ext_beacon_name));
  b_index += strlen(ext_beacon_name);

  uint8_t m_data_len = 19;

  extended_beacon[++b_index] = m_data_len;
  extended_beacon[++b_index] = AD_TYPE_MANUFACTURER_SPECIFIC_DATA;
  --m_data_len;
  extended_beacon[++b_index] = 0x30;
  --m_data_len;
  extended_beacon[++b_index] = 0x00;
  --m_data_len;
  // set some extra data
  for (uint8_t i = 0; i < m_data_len; ++i)
  {
    extended_beacon[++b_index] = i;
  }

  extended_beacon[++b_index] = 0x02;
  extended_beacon[++b_index] = AD_TYPE_TX_POWER_LEVEL;
  extended_beacon[++b_index] = 0x18;


  Advertising_Set_Parameters.Advertising_Handle = 0;
  Advertising_Set_Parameters.Duration = 0;
  Advertising_Set_Parameters.Max_Extended_Advertising_Events = 0;

  // set advertising parameters
  ret = aci_gap_set_advertising_configuration(Advertising_Set_Parameters.Advertising_Handle,
                                              GAP_MODE_GENERAL_DISCOVERABLE,
                                              (HCI_ADV_EVENT_PROP_TXPOWER_INC),
                                              2056,
                                              2056,
                                              HCI_ADV_CH_ALL,
                                              HCI_ADDR_PUBLIC,  /* ignored param */
                                              peeraddr, /* No peer address */
                                              HCI_ADV_FILTER_NONE,
                                              0, /* 0 dBm */
                                              HCI_PHY_LE_1M, /* Primary advertising PHY */
                                              0, /* 0 skips */
                                              HCI_PHY_LE_1M, /* Secondary advertising PHY. Not used with legacy advertising. */
                                              1, /* SID */
                                              0x00 /* No scan request notifications */);
  check_ble_success(ret, "aci_gap_set_advertising_configuration");

  // set advertising data
  ret = aci_gap_set_advertising_data(Advertising_Set_Parameters.Advertising_Handle, ADV_COMPLETE_DATA, sizeof(extended_beacon), extended_beacon);
  check_ble_success(ret, "aci_gap_set_advertising_data");

  ret = GAP_set_extended_advertising_data(Advertising_Set_Parameters.Advertising_Handle, ADV_COMPLETE_DATA, sizeof(extended_beacon), extended_beacon);
  check_ble_success(ret, "GAP_set_extended_advertising_data");

  // set periodic advertisement parameters
  ret = hci_le_set_periodic_advertising_parameters(Advertising_Set_Parameters.Advertising_Handle,
                                                   1000,
                                                   2056,
                                                   0x0040);
  check_ble_success(ret, "hci_le_set_periodic_advertising_parameters");

  // set connectionless cte parameters
  ret = hci_le_set_connectionless_cte_transmit_parameters(Advertising_Set_Parameters.Advertising_Handle,
                                                          0x14, // length (0x02...x014)
                                                          CTE_AOA, //type (AoA tone extension)
                                                          0x01, // count
                                                          0x00, // antenna count
                                                          NULL /*antenna array*/);
  check_ble_success(ret, "hci_le_set_connectionless_cte_transmit_parameters");

  // enable periodic advertisement
  ret = hci_le_set_periodic_advertising_enable(0x02, Advertising_Set_Parameters.Advertising_Handle);
  check_ble_success(ret, "hci_le_set_periodic_advertising_enable");

  // set connectionless cte transmit enable
  ret = hci_le_set_connectionless_cte_transmit_enable(Advertising_Set_Parameters.Advertising_Handle ,1);
  check_ble_success(ret, "hci_le_set_connectionless_cte_transmit_enable");

  // enable advertising
  ret = aci_gap_set_advertising_enable(1, 1, &Advertising_Set_Parameters);
  check_ble_success(ret, "aci_gap_set_advertising_enable");