code: def echo(self, data):
          
          return pyhsm.basic_cmd.YHSM_Cmd_Echo(self.stick, data).execute()
docs: Echo test.
  
          @type data: string
          @return: data read from YubiHSM -- should equal `data'
          @rtype: string
  
          @see: L{pyhsm.basic_cmd.YHSM_Cmd_Echo}