code: def remote_space_available(self, search_pattern=r"(\d+) \w+ free"):
          
          remote_cmd = "dir {}".format(self.file_system)
          remote_output = self.ssh_ctl_chan.send_command_expect(remote_cmd)
          match = re.search(search_pattern, remote_output)
          if "kbytes" in match.group(0) or "Kbytes" in match.group(0):
              return int(match.group(1)) * 1000
          return int(match.group(1))
docs: Return space available on remote device.