Hello,
Yes this thread is the follow up of the post you have mentioned. I can show you the code that I am using to fill the BLE information:
int BLEHandler::SetOOBPairData(uint8_t *ndefBuf, uint16_t ndefBufSize)
{
pcomm::ble::BLEHandler& BLE = pcomm::ble::BLEHandler::Instance();
ndefTypeBluetooth bluetooth;
ndefRecord leOobRecord;
ndefType ndefBt;
ndefStatus rc;
static uint8_t tkBuf[BLE_TK_LEN];
if (ndefBuf == NULL)
return ERR_PARAM;
/* Reset bluetooth record */
rc = ndefBluetoothReset(&bluetooth);
if (rc != ERR_NONE)
return rc;
/* Get bluetooth informations - Address, Address Type, Random and Confirm value */
bt_le_oob_get_local(0, &oob_data);
/* EIR Field 1: LE Device Address: Mandatory - 6 LSB bytes: Device address, 7th byte: Address type (Public/Random) */
uint8_t eirLeAddress[9] = { 8, NDEF_BT_EIR_LE_DEVICE_ADDRESS };
memcpy(&eirLeAddress[2], oob_data.addr.a.val, 6);
eirLeAddress[8] = oob_data.addr.type;
/* EIR Field 2: LE Role: Mandatory */
uint8_t eirLeRole[3] = { 2, NDEF_BT_EIR_LE_ROLE, NDEF_BLE_ROLE_PERIPH_ONLY };
/* Generate random TK */
rc = BLE.GenerateRandomTK(tkBuf, BLE_TK_LEN);
if (rc != 0)
return rc;
/* EIR Field 3: Temporary Key (TK) for secure pairing */
uint8_t eirTk[18] = { 17, NDEF_BT_EIR_SECURITY_MANAGER_TK_VALUE };
memcpy(&eirTk[2], tkBuf, BLE_TK_LEN);
/* EIR Field 4: Confirmation Value - Needed for LE Secure Connections */
uint8_t eirSecureConnConfirmation[18] = { 17, NDEF_BT_EIR_LE_SECURE_CONN_CONFIRMATION_VALUE };
memcpy(&eirSecureConnConfirmation[2], oob_data.le_sc_data.c, BLE_SC_CONFIRMATION_VALUE_SIZE);
/* EIR Field 5: Randomizer Value - Needed for LE Secure Connections */
uint8_t eirSecureConnRandom[18] = { 17, NDEF_BT_EIR_LE_SECURE_CONN_RANDOM_VALUE };
memcpy(&eirSecureConnRandom[2], oob_data.le_sc_data.r, BLE_SC_RANDOM_VALUE_SIZE);
/* EIR Field 7: LE Flags: BR/EDR not supported */
uint8_t eirLeFlags[3] = { 2, NDEF_BT_EIR_FLAGS, 0x04 };
/* EIR Field 8: Device local name */
const char *localName = bt_get_name();
uint8_t eirLocalName[2 + strlen(localName)] = { (uint8_t)(1 + strlen(localName)), NDEF_BT_EIR_COMPLETE_LOCAL_NAME };
memcpy(&eirLocalName[2], localName, strlen(localName));
/* Set all EIR */
rc = ndefBluetoothSetEir(&bluetooth, (uint8_t *) &eirLeAddress);
if (rc != ERR_NONE)
return rc;
rc = ndefBluetoothSetEir(&bluetooth, (uint8_t *) &eirLeRole);
if (rc != ERR_NONE)
return rc;
rc = ndefBluetoothSetEir(&bluetooth, (uint8_t *) &eirTk);
if (rc != ERR_NONE)
return rc;
rc = ndefBluetoothSetEir(&bluetooth, (uint8_t *) &eirSecureConnConfirmation);
if (rc != ERR_NONE)
return rc;
rc = ndefBluetoothSetEir(&bluetooth, (uint8_t *) &eirSecureConnRandom);
if (rc != ERR_NONE)
return rc;
rc = ndefBluetoothSetEir(&bluetooth, (uint8_t *) &eirLeFlags);
if (rc != ERR_NONE)
return rc;
rc = ndefBluetoothSetEir(&bluetooth, (uint8_t *) &eirLocalName);
if (rc != ERR_NONE)
return rc;
/* Init BLE record */
rc = ndefBluetoothLeInit(&ndefBt, &bluetooth);
if (rc != ERR_NONE)
return rc;
rc = ndefTypeToRecord(&ndefBt, &leOobRecord);
if (rc != ERR_NONE)
return rc;
/* Encode the record starting after the first two bytes that are saved to store the NDEF file length */
ndefBuffer bufRecord = { &ndefBuf[2], (uint32_t)(ndefBufSize - 2) };
rc = ndefRecordEncode(&leOobRecord, &bufRecord);
if (rc != ERR_NONE)
return rc;
/* Store the NDEF file length on the two first bytes */
ndefBuf[0] = bufRecord.length >> 8;
ndefBuf[1] = bufRecord.length & 0xFF;
CCC_Log("NDEF size: %d\n", bufRecord.length);
CCC_Log("NDEF :%s\n", hex2Str(bufRecord.buffer, bufRecord.length));
return rc;
}This seems to work well for some phones (like the Samsung A12) where the pairing always occurs. However with other phones like Xiaomi or Huawei the pairing procedure is never triggered. This seems strange to me because with other manufacturer' example I was able to complete the pairing. I can also show you what the NDEF message of the above code looks like:
