code: def x10_all_units_off(self, housecode):
          
          if isinstance(housecode, str):
              housecode = housecode.upper()
          else:
              raise TypeError('Housecode must be a string')
          msg = X10Send.command_msg(housecode, X10_COMMAND_ALL_UNITS_OFF)
          self.send_msg(msg)
          self._x10_command_to_device(housecode, X10_COMMAND_ALL_UNITS_OFF, msg)
docs: Send the X10 All Units Off command.