Usage of the /mavros/rc/override topic

edit

Hello All,

I am a newbie working with mavros. I have noticed that when I echo the rc/in topic, I can see 16 channels. But by publishing on the rc/override topic, I'm able to manipulate the values of only the first 8 channels using this command:

rostopic pub -1 /mavros/rc/override mavros_msgs/OverrideRCIn '[1500, 1500, 1500, 1500, 1325, 1560, 2000, 1500]'

But if say, I enter one more channel value, I get this error: ERROR: Field [channels] has incorrect number of elements: 9 != 8

I'd like to manipulate the values of the remaining channels. Hope you can help with this. Thanks.