* <code>\xx</code>: single byte.
* <code>{...}</code>: utf8 strings or raw data, suffixed with a <code>\00</code> byte. To avoid confusion with this end-of-string byte, all transfered <code>\00</code> and <code>\FF</code> bytes that occur in raw data will be are prefixed with by an additional <code>\FF</code>byte.
===Authentication===