'Send a negotiation message for the option C{about} with C{data} as the
payload.
@param data: the payload
@type data: L{bytes}
@see: L{ITelnetTransport.requestNegotiation}'

def requestNegotiation(self, about, data):

    data = data.replace(IAC, (IAC * 2))
    self._write((((((IAC + SB) + about) + data) + IAC) + SE))
