I'm working on BLE project with espressif library. And It returns me founded BLE device.

std::string getManufacturerData();
std::string getName();
int         getRSSI();
BLEScan*    getScan();

When I want to print device name to serial port

BLEAdvertisedDevice founded_dev;
Serial.println("Name -> " + founded_dev.getName());

It gives me error like this

no matching function for call to 'HardwareSerial::println(std::__cxx11::basic_string<char>)'

So how can i convert to std:string to String in Arduino?

1 Answer 1


Don't. Instead just access the underlying C string:

Serial.print(F("Name -> "));
  • That works for getName() but not some of the other methods such as BLEAdvertisedDevice::getAddress() or BLEAdvertisedDevice::getServiceUUID()
    – Tom Auger
    Commented Jan 31, 2020 at 2:04
  • @TomAuger That's because they don't return a string. The first returns a BLEAddress, the second a BLEUUID. Custom types that will need special handling.
    – Majenko
    Commented Jan 31, 2020 at 9:53
  • 2
    For the UUID you can use getServiceUUID().toString().c_str(), For the address you can use: getAddress().toString().c_str().
    – Majenko
    Commented Jan 31, 2020 at 9:54

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