def __init__(self, stick, command, payload='<STR_LIT>'):
self.stick = stick<EOL>self.command = command<EOL>self.payload = payload<EOL>return None<EOL>
The base class for all YSM_ commands.

@param stick: Reference to a YubiHSM
@param command: The YSM_xxx command defined in pyhsm.defines.
@param payload: a packed C struct, represented as a Python string

@type stick: L{pyhsm.stick.YHSM_Stick}
@type command: integer
@type payload: string