docs: def push(self, src, dest, timeout=None, key=None):
          """
          Push (synchronize) some data onto the phablet device
  
          :param src:
              source file or directory
          :param dest:
              destination file or directory
          :param timeout:
              a timeout (in seconds) for device discovery
          :param key:
              a path to a public ssh key to use for connection
          :returns:
              the exit code of the command
          """
          self.connect(timeout, key)
          _logger.info("Pushing %r to %r", src, dest)
          return self._check_call(
              self.rsync_cmdline(src, dest, '-a'))