for (auto tup : senswarn_chars) {auto ble_char = std::get<BLEUnsignedCharCharacteristic*>(tup);auto val_ptr  = std::get<bool*>(tup);  ble_char->setEventHandler(      BLEWritten,      [val_ptr](BLEDevice central, BLECharacteristic characteristic) {bool warning_active = *characteristic.value() !=0;if (*val_ptr != warning_active) { *val_ptr = warning_active; }if (warning_active) { ch_any_warning_active.writeValue(true); }      });  sv_senswarn.addCharacteristic(*ble_char);}