code: def do_o1(self, line):
          
          self.application.send_direct_operate_command(opendnp3.ControlRelayOutputBlock(opendnp3.ControlCode.LATCH_ON),
                                                       5,
                                                       command_callback)
docs: Send a DirectOperate BinaryOutput (group 12) index 5 LATCH_ON to the Outstation. Command syntax is: o1