for (int periphIdx = 0; periphIdx < BLE.peripheralCount(); periphIdx++) {
 BLEDevice peripheral = BLE.peripheral(periphIdx);
 if (peripheral) {
 BLECharacteristic batteryLevelChar = peripheral.characteristic("2A19");
 if (!batteryLevelChar) {
 Serial.println("Peripheral does not have battery level characteristic!");
 peripheral.disconnect();
 }
 }
}