udp::resolver resolver(io_service);


udp::resolver::query query(udp::v4(), argv[1], "daytime");


udp::endpoint receiver_endpoint = *resolver.resolve(query);


udp::socket socket(io_service);

socket.open(udp::v4());

But, to send something else than a Daytime request, I need to know what are the avalaible option to put instead of "daytime" in this line :

udp::resolver::query query(udp::v4(), argv[1], "daytime");