BLE passkey defining and setting

armor · February 15, 2024, 8:45pm

In BLE.setPairingPasskey(peer, passkey); the passkey is defined as const uint8_t* type. Assuming this passkey is '000000' to '999999' how should this be defined and set as a parameter in the setter method?

rickkas7 · February 16, 2024, 1:13pm

It appears that it must be the 6 ASCII digits. Because it's not a null-terminated c-string, it's not declared as const char *, but you can cast a 6-digit c-string to const uint8_t * and it should work.

github.com

particle-iot/device-os/blob/develop/hal/src/rtl872x/ble_hal.cpp#L2066


      
              if (auth->params.equal) {
                  CHECK_RTL(le_bond_user_confirm(connHandle, GAP_CFM_CAUSE_ACCEPT));
              } else {
                  CHECK_RTL(le_bond_user_confirm(connHandle, GAP_CFM_CAUSE_REJECT));
              }
          }
          else if (auth->type == BLE_PAIRING_AUTH_DATA_PASSKEY) {
              CHECK_TRUE(connection->pairState == BLE_PAIRING_STATE_STARTED, SYSTEM_ERROR_INVALID_STATE);
              connection->pairState = BLE_PAIRING_STATE_SET_AUTH_DATA;
              for (uint8_t i = 0; i < BLE_PAIRING_PASSKEY_LEN; i++) {
                  if (!std::isdigit(auth->params.passkey[i])) {
                      LOG(ERROR, "Invalid digits.");
                      CHECK_RTL(le_bond_passkey_input_confirm(connHandle, 0, GAP_CFM_CAUSE_REJECT));
                      return SYSTEM_ERROR_INVALID_ARGUMENT;
                  }
              }
              uint32_t passkey = std::atoi((const char*)auth->params.passkey);
              CHECK_RTL(le_bond_passkey_input_confirm(connHandle, passkey, GAP_CFM_CAUSE_ACCEPT));
          }
          else {
              LOG(ERROR, "SYSTEM_ERROR_NOT_SUPPORTED");

armor · February 16, 2024, 7:07pm

Thanks - I had done that cast (const uint8_t*) and the compiler threw a warning about loss of precision. The type used just seems odd when the passkey digits are [0-9] so why not use char* ?

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BLE passkey defining and setting

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