'Initialize the SCP client.'

@property
def scp(self):

    if ((not self._scp) or (not self._scp.transport.is_active())):
        log.debug('creating    scp    connection')
        self._scp = scp.SCPClient(self.transport, progress=self._file_transfer_progress, socket_timeout=self._timeout)
    return self._scp
