disarm motors

def cmd_disarm(self, args):
        '''disarm motors'''
        p2 = 0
        if len(args) == 1 and args[0] == 'force':
            p2 = 21196
        self.master.mav.command_long_send(
            self.target_system,  # target_system
            0,
            mavutil.mavlink.MAV_CMD_COMPONENT_ARM_DISARM, # command
            0, # confirmation
            0, # param1 (0 to indicate disarm)
            p2, # param2 (all other params meaningless)
            0, # param3
            0, # param4
            0, # param5
            0, # param6
            0)