[ros-users] Simple action client - querying its status

[Blaise Gassend]

Hi Daniel,

getState() is telling you the state of the client's current goal, not
the state of the server. Hence, if there is no goal, getState is
meaningless. This makes sense because a server could have the ability
to handle multiple goals in parallel. Hence, there isn't a single
state for the server that you can query.

I imagine that what you are trying to do is determine if a server that
can only handle a single goal is currently busy. I don't think that
there is a general answer to that question. Some servers might reject
your goal if they are already busy. Others might interrupt the
existing goal. Let's see what others have to reply.

Blaise

On Fri, Oct 22, 2010 at 12:51 AM, Daniel Stonier <d.stonier at gmail.com> wrote:
>
> Just a quick question with regards to the simple action client - why is
> using the getState() method considered improper when there is no goal
> (action client outputs an ROS_ERROR when you do so). Is there another means
> of querying the server to know whether it is currently handling a goal or
> not?
> Or perhaps, am I mistaken in thinking that I should be needing to?
> Regards,
> Daniel Stonier.
> --
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