Returns the given variable's definition.

        Args:
          var: A variable the bootloader tracks. Use 'all' to get them all.
          info_cb: See Download. Usually no messages.

        Returns:
          Value of var according to the current bootloader.

def Getvar(self, var, info_cb=DEFAULT_MESSAGE_CALLBACK):
        """Returns the given variable's definition.

        Args:
          var: A variable the bootloader tracks. Use 'all' to get them all.
          info_cb: See Download. Usually no messages.

        Returns:
          Value of var according to the current bootloader.
        """
        return self._SimpleCommand(b'getvar', arg=var, info_cb=info_cb)