Guided mode sending message


I have a problem with overwriting the message in guided mode using ardurover.
Here is the problem:
I arm my pixhawk which uses ardurover framware. I have a python script which gets the thruster knob position and map it to a velocity and I send that value as desired velocity to follow. The problem is that pixhawk does the command but if I send the second command it waits till it finishes the first command and then execute the second command. Is there any way yo overwrite the first command so as soon as I send a new command it execute that one?

I hope the explanation is enough.