addData string and iOS 18

[kvshino]

I tried your repo, but it gives me two issues:

1. During the compilation of the .ino file, addData requires an Arduino String, but you are passing it a std::string. I fixed it by changing these two lines like this:
   a->addData(String((std::string(cdata, 2) + std::string((char *)&uuid.getNative()->uuid.uuid16, 2)).c_str()));
a->addData(String((std::string(cdata, 2) + std::string((char *)&uuid.getNative()->uuid.uuid128, 16)).c_str()));

2. My iPhone (running iOS 18, if it matters) does not detect any "ANCS" while Android does (though it cannot connect properly).