[boost] [asio] basic_datagram_socket::send_to

Greetings, will method basic_datagram_socket::send_to flush data immediately to the endpoint or will first fill its internal buffer and than flush data to endpoint? I would like to make sure, data gets flushed to endpoint when this method is called. Is there any other way to flush data to endpoint? Does any socket::set_option(option); makes difference to behaviour of send_to method ? Why isn't it possible to set buffer size lower than 1024 (low-level restriction?), with method (basic_datagram_socket::send_buffer_size()) There is no documentation about this. Best regards, ----- Miroslav Beranič ml.