#include "BleFingerprint.h" #include "BleFingerprintCollection.h" #include "rssi.h" #include "string_utils.h" #include "util.h" #include "mbedtls/aes.h" class ClientCallbacks : public BLEClientCallbacks { bool onConnParamsUpdateRequest(NimBLEClient *pClient, const ble_gap_upd_params *params) { return true; }; }; static ClientCallbacks clientCB; bool BleFingerprint::shouldHide(const String& s) { if (BleFingerprintCollection::include.length() > 0 && !prefixExists(BleFingerprintCollection::include, s)) return true; return (BleFingerprintCollection::exclude.length() > 0 && prefixExists(BleFingerprintCollection::exclude, s)); } bool BleFingerprint::setId(const String& newId, short newIdType, const String& newName) { if (newIdType < idType && idType > 0) return false; hidden = shouldHide(newId); ignore = newIdType < 0; if ((idType != newIdType) || !id.equals(newId)) { countable = !ignore && !hidden && !BleFingerprintCollection::countIds.isEmpty() && prefixExists(BleFingerprintCollection::countIds, newId); bool newQuery = !ignore && !BleFingerprintCollection::query.isEmpty() && prefixExists(BleFingerprintCollection::query, newId); if (newQuery != allowQuery) { allowQuery = newQuery; if (allowQuery) { qryAttempts = 0; if (rssi < -80) { qryDelayMillis = 30000; lastQryMillis = millis(); } else if (rssi < -70) { qryDelayMillis = 5000; lastQryMillis = millis(); } } } id = newId; idType = newIdType; added = false; } if (!newName.isEmpty() && !name.equals(newName)) name = newName; return true; } int BleFingerprint::get1mRssi() const { if (calRssi != NO_RSSI) return calRssi; if (mdRssi != NO_RSSI) return mdRssi; if (asRssi != NO_RSSI) return asRssi; return BleFingerprintCollection::refRssi + DEFAULT_TX; } BleFingerprint::BleFingerprint(const BleFingerprintCollection *parent, BLEAdvertisedDevice *advertisedDevice, float fcmin, float beta, float dcutoff) : oneEuro{OneEuroFilter(1, fcmin, beta, dcutoff)} { firstSeenMillis = millis(); address = NimBLEAddress(advertisedDevice->getAddress()); addressType = advertisedDevice->getAddressType(); newest = recent = oldest = rssi = advertisedDevice->getRSSI(); seenCount = 1; fingerprintAddress(); } void BleFingerprint::fingerprint(NimBLEAdvertisedDevice *advertisedDevice) { if (advertisedDevice->haveName()) { std::string name = advertisedDevice->getName(); if (!name.empty()) setId(String("name:") + kebabify(name).c_str(), ID_TYPE_NAME, String(name.c_str())); } if (advertisedDevice->getAdvType() > 0) connectable = true; size_t serviceAdvCount = advertisedDevice->getServiceUUIDCount(); size_t serviceDataCount = advertisedDevice->getServiceDataCount(); bool haveTxPower = advertisedDevice->haveTXPower(); int8_t txPower = advertisedDevice->getTXPower(); if (serviceAdvCount > 0) fingerprintServiceAdvertisements(advertisedDevice, serviceAdvCount, haveTxPower, txPower); if (serviceDataCount > 0) fingerprintServiceData(advertisedDevice, serviceDataCount, haveTxPower, txPower); if (advertisedDevice->haveManufacturerData()) fingerprintManufactureData(advertisedDevice, haveTxPower, txPower); } int bt_encrypt_be(const uint8_t *key, const uint8_t *plaintext, uint8_t *enc_data) { mbedtls_aes_context s = {0}; mbedtls_aes_init(&s); if (mbedtls_aes_setkey_enc(&s, key, 128) != 0) { mbedtls_aes_free(&s); return BLE_HS_EUNKNOWN; } if (mbedtls_aes_crypt_ecb(&s, MBEDTLS_AES_ENCRYPT, plaintext, enc_data) != 0) { mbedtls_aes_free(&s); return BLE_HS_EUNKNOWN; } mbedtls_aes_free(&s); return 0; } struct encryption_block { uint8_t key[16]; uint8_t plain_text[16]; uint8_t cipher_text[16]; }; int ble_ll_resolv_rpa(const uint8_t *rpa, const uint8_t *irk) { int rc; struct encryption_block ecb; auto irk32 = (const uint32_t *)irk; auto key32 = (uint32_t *)&ecb.key[0]; auto pt32 = (uint32_t *)&ecb.plain_text[0]; key32[0] = irk32[0]; key32[1] = irk32[1]; key32[2] = irk32[2]; key32[3] = irk32[3]; pt32[0] = 0; pt32[1] = 0; pt32[2] = 0; pt32[3] = 0; ecb.plain_text[15] = rpa[3]; ecb.plain_text[14] = rpa[4]; ecb.plain_text[13] = rpa[5]; auto err = bt_encrypt_be(ecb.key, ecb.plain_text, ecb.cipher_text); if ((ecb.cipher_text[15] == rpa[0]) && (ecb.cipher_text[14] == rpa[1]) && (ecb.cipher_text[13] == rpa[2])) { rc = 1; } else { rc = 0; } //Serial.printf("RPA resolved %d %d %02x%02x%02x %02x%02x%02x\n", rc, err, rpa[0], rpa[1], rpa[2], ecb.cipher_text[15], ecb.cipher_text[14], ecb.cipher_text[13]); return rc; } void BleFingerprint::fingerprintAddress() { auto mac = getMac(); if (!BleFingerprintCollection::knownMacs.isEmpty() && prefixExists(BleFingerprintCollection::knownMacs, mac)) setId("known:" + mac, ID_TYPE_KNOWN_MAC); else { switch (addressType) { case BLE_ADDR_PUBLIC: case BLE_ADDR_PUBLIC_ID: setId(mac, ID_TYPE_PUBLIC_MAC); break; case BLE_ADDR_RANDOM: { auto naddress = address.getNative(); auto irks = BleFingerprintCollection::irks; auto it = std::find_if(irks.begin(), irks.end(), [naddress](std::pair &p) { auto irk = std::get<0>(p); return ble_ll_resolv_rpa(naddress, irk); }); if (it != irks.end()) { setId(std::get<1>(*it), ID_TYPE_KNOWN_IRK); break; } } default: setId(mac, ID_TYPE_MAC); break; } } } void BleFingerprint::fingerprintServiceAdvertisements(NimBLEAdvertisedDevice *advertisedDevice, size_t serviceAdvCount, bool haveTxPower, int8_t txPower) { for (size_t i = 0; i < serviceAdvCount; i++) { auto uuid = advertisedDevice->getServiceUUID(i); #ifdef VERBOSE Serial.printf("Verbose | MAC: %s, ID: %-58s%ddBm AD: %s\n", getMac().c_str(), getId().c_str(), rssi, advertisedDevice->getServiceUUID(i).toString().c_str()); #endif if (uuid == roomAssistantService) { asRssi = BleFingerprintCollection::refRssi + RM_ASST_TX; if (!rmAsst) { rmAsst = true; if (didQuery) { qryDelayMillis = 0; qryAttempts = 0; didQuery = false; } } return; } else if (uuid == tileUUID) { asRssi = BleFingerprintCollection::refRssi + TILE_TX; setId("tile:" + getMac(), ID_TYPE_TILE); return; } else if (uuid == sonosUUID) { asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("sonos:" + getMac(), ID_TYPE_SONOS); return; } else if (uuid == itagUUID) { asRssi = BleFingerprintCollection::refRssi + (haveTxPower ? txPower : ITAG_TX); setId("itag:" + getMac(), ID_TYPE_ITAG); return; } else if (uuid == trackrUUID) { asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("trackr:" + getMac(), ID_TYPE_TRACKR); return; } else if (uuid == tractiveUUID) { asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("tractive:" + getMac(), ID_TYPE_TRACTIVE); return; } else if (uuid == vanmoofUUID) { asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("vanmoof:" + getMac(), ID_TYPE_VANMOOF); return; } else if (uuid == (meaterService)) { asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("meater:" + getMac(), ID_TYPE_MEATER); return; } else if (uuid == nutUUID) { asRssi = BleFingerprintCollection::refRssi + (haveTxPower ? txPower : NUT_TX); setId("nut:" + getMac(), ID_TYPE_NUT); return; } } String fingerprint = "ad:"; asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; for (int i = 0; i < serviceAdvCount; i++) { std::string sid = advertisedDevice->getServiceUUID(i).toString(); fingerprint = fingerprint + sid.c_str(); } if (haveTxPower) fingerprint = fingerprint + String(-txPower); setId(fingerprint, ID_TYPE_AD); } void BleFingerprint::fingerprintServiceData(NimBLEAdvertisedDevice *advertisedDevice, size_t serviceDataCount, bool haveTxPower, int8_t txPower) { asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; String fingerprint = ""; for (int i = 0; i < serviceDataCount; i++) { BLEUUID uuid = advertisedDevice->getServiceDataUUID(i); std::string strServiceData = advertisedDevice->getServiceData(i); #ifdef VERBOSE Serial.printf("Verbose | MAC: %s, ID: %-58s%ddBm SD: %s/%s\n", getMac().c_str(), getId().c_str(), rssi, uuid.toString().c_str(), hexStr(strServiceData).c_str()); #endif if (uuid == exposureUUID) { // found COVID-19 exposure tracker calRssi = BleFingerprintCollection::refRssi + EXPOSURE_TX; setId("exp:" + String(strServiceData.length()), ID_TYPE_EXPOSURE); disc = hexStr(strServiceData).c_str(); } else if (uuid == smartTagUUID) { // found Samsung smart tag asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("smarttag:" + String(strServiceData.length()), ID_TYPE_SMARTTAG); } else if (uuid == miThermUUID) { asRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; if (strServiceData.length() == 15) { // custom format auto serviceData = strServiceData.c_str(); temp = float(*(int16_t *)(serviceData + 6)) / 100.0f; humidity = float(*(uint16_t *)(serviceData + 8)) / 100.0f; mv = *(uint16_t *)(serviceData + 10); battery = serviceData[12]; #ifdef VERBOSE Serial.printf("Temp: %.1f°, Humidity: %.1f%%, mV: %hu, Battery: %hhu%%, flg: 0x%02hhx, cout: %hhu\n", temp, humidity, mv, battery, serviceData[14], serviceData[13]); #endif setId("miTherm:" + getMac(), ID_TYPE_MITHERM); } else if (strServiceData.length() == 13) { // format atc1441 auto serviceData = strServiceData.c_str(); int16_t x = (serviceData[6] << 8) | serviceData[7]; temp = float(x) / 10.0f; humidity = serviceData[8]; mv = x = (serviceData[10] << 8) | serviceData[11]; battery = serviceData[9]; #ifdef VERBOSE Serial.printf("Temp: %.1f°, Humidity: %.1f%%, mV: %hu, Battery: %hhu%%, cout: %hhu\n", temp, humidity, mv, battery, serviceData[12]); #endif setId("miTherm:" + getMac(), ID_TYPE_MITHERM); } } else if (uuid == eddystoneUUID && strServiceData.length() > 0) { if (strServiceData[0] == EDDYSTONE_URL_FRAME_TYPE && strServiceData.length() <= 18) { BLEEddystoneURL oBeacon = BLEEddystoneURL(); oBeacon.setData(strServiceData); calRssi = EDDYSTONE_ADD_1M + oBeacon.getPower(); } else if (strServiceData[0] == EDDYSTONE_TLM_FRAME_TYPE) { BLEEddystoneTLM oBeacon = BLEEddystoneTLM(); oBeacon.setData(strServiceData); temp = oBeacon.getTemp(); mv = oBeacon.getVolt(); #ifdef VERBOSE Serial.println(oBeacon.toString().c_str()); #endif } else if (strServiceData[0] == 0x00) { auto serviceData = strServiceData.c_str(); int8_t rss0m = *(int8_t *)(serviceData + 1); calRssi = EDDYSTONE_ADD_1M + rss0m; setId(Sprintf("eddy:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x-%02x%02x%02x%02x%02x%02x", strServiceData[2], strServiceData[3], strServiceData[4], strServiceData[5], strServiceData[6], strServiceData[6], strServiceData[7], strServiceData[8], strServiceData[9], strServiceData[10], strServiceData[11], strServiceData[12], strServiceData[13], strServiceData[14], strServiceData[15], strServiceData[16], strServiceData[17]), ID_TYPE_EBEACON); } } else { fingerprint = fingerprint + uuid.toString().c_str(); } } if (!fingerprint.isEmpty()) { if (haveTxPower) fingerprint = fingerprint + String(-txPower); setId("sd:" + fingerprint, ID_TYPE_SD); } } void BleFingerprint::fingerprintManufactureData(NimBLEAdvertisedDevice *advertisedDevice, bool haveTxPower, int8_t txPower) { std::string strManufacturerData = advertisedDevice->getManufacturerData(); #ifdef VERBOSE Serial.printf("Verbose | MAC: %s, ID: %-58s%ddBm MD: %s\n", getMac().c_str(), getId().c_str(), rssi, hexStr(strManufacturerData).c_str()); #endif if (strManufacturerData.length() >= 2) { String manuf = Sprintf("%02x%02x", strManufacturerData[1], strManufacturerData[0]); if (manuf == "004c") // Apple { if (strManufacturerData.length() == 25 && strManufacturerData[2] == 0x02 && strManufacturerData[3] == 0x15) { BLEBeacon oBeacon = BLEBeacon(); oBeacon.setData(strManufacturerData); calRssi = oBeacon.getSignalPower(); setId(Sprintf("iBeacon:%s-%u-%u", std::string(oBeacon.getProximityUUID()).c_str(), ENDIAN_CHANGE_U16(oBeacon.getMajor()), ENDIAN_CHANGE_U16(oBeacon.getMinor())), calRssi != 3 ? ID_TYPE_IBEACON : ID_TYPE_ECHO_LOST ); } else if (strManufacturerData.length() >= 4 && strManufacturerData[2] == 0x10) { String pid = Sprintf("apple:%02x%02x:%u", strManufacturerData[2], strManufacturerData[3], strManufacturerData.length()); if (haveTxPower) pid += -txPower; setId(pid, ID_TYPE_APPLE_NEARBY); disc = hexStr(strManufacturerData.substr(4)).c_str(); mdRssi = BleFingerprintCollection::refRssi + APPLE_TX; } else if (strManufacturerData.length() >= 4 && strManufacturerData[2] == 0x12 && strManufacturerData.length() == 29) { String pid = "apple:findmy"; setId(pid, ID_TYPE_FINDMY); mdRssi = BleFingerprintCollection::refRssi + APPLE_TX; } else if (strManufacturerData.length() >= 4) { String pid = Sprintf("apple:%02x%02x:%u", strManufacturerData[2], strManufacturerData[3], strManufacturerData.length()); if (haveTxPower) pid += -txPower; setId(pid, ID_TYPE_MISC_APPLE); mdRssi = BleFingerprintCollection::refRssi + APPLE_TX; } } else if (manuf == "05a7") // Sonos { mdRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("sonos:" + getMac(), ID_TYPE_SONOS); } else if (manuf == "0087") // Garmin { mdRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("garmin:" + getMac(), ID_TYPE_GARMIN); } else if (manuf == "4d4b") // iTrack { mdRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("iTrack:" + getMac(), ID_TYPE_ITRACK); } else if (manuf == "0157") // Mi-fit { mdRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("mifit:" + getMac(), ID_TYPE_MIFIT); } else if (manuf == "0006" && strManufacturerData.length() == 29) // microsoft { mdRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId(Sprintf("msft:cdp:%02x%02x", strManufacturerData[3], strManufacturerData[5]), ID_TYPE_MSFT); disc = Sprintf("%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", strManufacturerData[6], strManufacturerData[7], strManufacturerData[8], strManufacturerData[9], strManufacturerData[10], strManufacturerData[11], strManufacturerData[12], strManufacturerData[13], strManufacturerData[14], strManufacturerData[15], strManufacturerData[16], strManufacturerData[17], strManufacturerData[18], strManufacturerData[19], strManufacturerData[20], strManufacturerData[21], strManufacturerData[22], strManufacturerData[23], strManufacturerData[24], strManufacturerData[25]); } else if (manuf == "0075") // samsung { mdRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; setId("samsung:" + getMac(), ID_TYPE_MISC); } else if (manuf == "beac" && strManufacturerData.length() == 26) { BLEBeacon oBeacon = BLEBeacon(); oBeacon.setData(strManufacturerData.substr(0, 25)); setId(Sprintf("altBeacon:%s-%u-%u", std::string(oBeacon.getProximityUUID()).c_str(), ENDIAN_CHANGE_U16(oBeacon.getMajor()), ENDIAN_CHANGE_U16(oBeacon.getMinor())), ID_TYPE_ABEACON); calRssi = oBeacon.getSignalPower(); } else if (manuf != "0000") { mdRssi = haveTxPower ? BleFingerprintCollection::refRssi + txPower : NO_RSSI; String fingerprint = Sprintf("md:%s:%u", manuf.c_str(), strManufacturerData.length()); if (haveTxPower) fingerprint = fingerprint + String(-txPower); setId(fingerprint, ID_TYPE_MD); } } } bool BleFingerprint::filter() { Reading inter1, inter2; inter1.timestamp = millis(); inter1.value = raw; return oneEuro.push(&inter1, &inter2) && diffFilter.push(&inter2, &output); } bool BleFingerprint::seen(BLEAdvertisedDevice *advertisedDevice) { lastSeenMillis = millis(); reported = false; seenCount++; fingerprint(advertisedDevice); if (ignore) return false; oldest = recent; recent = newest; newest = advertisedDevice->getRSSI(); rssi = median_of_3(oldest, recent, newest); float ratio = (get1mRssi() - rssi) / (10.0f * BleFingerprintCollection::absorption); raw = pow(10, ratio); if (filter()) hasValue = true; if (!close && newest > CLOSE_RSSI) { GUI::close(this); close = true; } else if (close && newest < LEFT_RSSI) { GUI::left(this); close = false; } if (!added) { added = true; return true; } return false; } void BleFingerprint::setInitial(int initalRssi, float initalDistance) { newest = recent = oldest = rssi = initalRssi; raw = initalDistance; hasValue = filter() || filter(); } void BleFingerprint::fill(JsonObject *doc) { (*doc)[F("id")] = id; if (!name.isEmpty()) (*doc)[F("name")] = name; if (!disc.isEmpty()) (*doc)[F("disc")] = disc; if (idType) (*doc)[F("idType")] = idType; (*doc)[F("rssi@1m")] = get1mRssi(); (*doc)[F("rssi")] = rssi; (*doc)[F("raw")] = serialized(String(raw, 2)); (*doc)[F("distance")] = serialized(String(output.value.position, 2)); (*doc)[F("speed")] = serialized(String(output.value.speed * 1e3f, 2)); (*doc)[F("mac")] = SMacf(address); (*doc)[F("interval")] = (millis() - firstSeenMillis) / seenCount; if (mv) (*doc)[F("mV")] = mv; if (battery != 0xFF) (*doc)[F("batt")] = battery; if (temp) (*doc)[F("temp")] = serialized(String(temp, 1)); if (humidity) (*doc)[F("rh")] = serialized(String(humidity, 1)); } bool BleFingerprint::report(JsonObject *doc) { if (ignore || idType == 0 || hidden) return false; if (reported || !hasValue) return false; auto maxDistance = BleFingerprintCollection::maxDistance; if (maxDistance > 0 && output.value.position > maxDistance) return false; auto now = millis(); if ((abs(output.value.position - lastReported) < BleFingerprintCollection::skipDistance) && (lastReportedMillis > 0) && (now - lastReportedMillis < BleFingerprintCollection::skipMs)) return false; lastReportedMillis = now; lastReported = output.value.position; reported = true; fill(doc); return true; } bool BleFingerprint::query() { if (!(allowQuery || rmAsst) || didQuery) return false; if (rssi < -90) return false; auto now = millis(); if (now - lastSeenMillis > 5) return false; if (now - lastQryMillis < qryDelayMillis) return false; didQuery = true; lastQryMillis = now; bool success = false; Serial.printf("%u Query | MAC: %s, ID: %-58s%ddBm %lums\n", xPortGetCoreID(), getMac().c_str(), id.c_str(), rssi, now - lastSeenMillis); NimBLEClient *pClient = NimBLEDevice::getClientListSize() ? NimBLEDevice::getClientByPeerAddress(address) : nullptr; if (!pClient) pClient = NimBLEDevice::getDisconnectedClient(); if (!pClient) pClient = NimBLEDevice::createClient(); pClient->setClientCallbacks(&clientCB, false); pClient->setConnectionParams(12, 12, 0, 48); pClient->setConnectTimeout(5); NimBLEDevice::getScan()->stop(); if (pClient->connect(address)) { bool iphone = true; if (allowQuery) { std::string sMdl = pClient->getValue(deviceInformationService, modelChar); std::string sName = pClient->getValue(genericAccessService, nameChar); iphone = sMdl.find("iPhone") == 0; if (!sName.empty() && sMdl.find(sName) == std::string::npos && sName != "Apple Watch") { if (setId(String("name:") + kebabify(sName).c_str(), ID_TYPE_QUERY_NAME, String(sName.c_str()))) { Serial.printf("\u001b[38;5;104m%u Name | MAC: %s, ID: %-58s%ddBm %s\u001b[0m\n", xPortGetCoreID(), getMac().c_str(), id.c_str(), rssi, sName.c_str()); } success = true; } if (!sMdl.empty()) { if (setId(String("apple:") + kebabify(sMdl).c_str(), ID_TYPE_QUERY_MODEL, String(sMdl.c_str()))) { Serial.printf("\u001b[38;5;136m%u Model | MAC: %s, ID: %-58s%ddBm %s\u001b[0m\n", xPortGetCoreID(), getMac().c_str(), id.c_str(), rssi, sMdl.c_str()); } success = true; } } if (rmAsst || iphone) // For some reason we often don't get room assistant's service advertisement { std::string sRmAst = pClient->getValue(roomAssistantService, rootAssistantCharacteristic); if (!sRmAst.empty()) { if (setId(String("roomAssistant:") + kebabify(sRmAst).c_str(), ID_TYPE_RM_ASST)) { Serial.printf("\u001b[38;5;129m%u RmAst | MAC: %s, ID: %-58s%ddBm %s\u001b[0m\n", xPortGetCoreID(), getMac().c_str(), id.c_str(), rssi, sRmAst.c_str()); } success = true; } } } NimBLEDevice::deleteClient(pClient); if (success) return true; qryAttempts++; qryDelayMillis = min(int(pow(10, qryAttempts)), 60000); Serial.printf("%u QryErr| MAC: %s, ID: %-58s%ddBm Try %d, retry after %dms\n", xPortGetCoreID(), getMac().c_str(), id.c_str(), rssi, qryAttempts, qryDelayMillis); didQuery = false; return true; } bool BleFingerprint::shouldCount() { bool prevCounting = counting; if (ignore || !countable || !hasValue) counting = false; else if (getMsSinceFirstSeen() <= BleFingerprintCollection::countMs || getMsSinceLastSeen() > BleFingerprintCollection::countMs) counting = false; else if (counting && output.value.position > BleFingerprintCollection::countExit) counting = false; else if (!counting && output.value.position <= BleFingerprintCollection::countEnter) counting = true; if (prevCounting != counting) { counting ? GUI::plusOne(this) : GUI::minusOne(this); } return counting; }