def cmd_version(self, args):
        '''show version'''
        self.master.mav.command_long_send(self.settings.target_system,
                                          self.settings.target_component,
                                          mavutil.mavlink.MAV_CMD_REQUEST_AUTOPILOT_CAPABILITIES,
                                          0,
                                          1, 0, 0, 0, 0, 0, 0)