code: def Getvar(self, var, info_cb=DEFAULT_MESSAGE_CALLBACK):
          
          return self._SimpleCommand(b'getvar', arg=var, info_cb=info_cb)
docs: 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.