[Rock-dev] Adding "Simple" timestamped values

[Sylvain Joyeux]

> Currently i need and simple "Comment" message. for this i need an string
> and the timestamp. In the past i had often the usecase to output basic
> data with an timestamp (light values, depth (okay depth is an rbs) or
> other simple sensor values, for this would be great to have an "base" type.
If you want to send debug data, then design a debug datatype that match 
your COMPLETE algorithm and send the WHOLE debug data all the time (not 
"when I want to debug it"). Creating the type right away will allow you 
to extend it in the future I doubt that *any* of you algorithms only 
have an integer/float/double as internal state.

If you need a "comment" message (which I highly doubt it makes sense), 
then just create a "Comment" message

If you need sensor values, then create specific sensor types. It will 
actually tell you *what* is in the data that your are producing, in 
addition to *how* the value is stored.

> Sometimes also for debugging purpuse i would like to have doubles that
> can be easily plottet without creating classes for this.

as far as I remember, extracting a double from a sample is achieved in 
vizkit by

task.port.connect_to do |data, _|
   v = data.field[3]
   plotting_widget.whatever_method_can_be_used_to_plot(v)
   v
end

Hardly a case for adding these types.
-- 
Sylvain Joyeux (Dr.Ing.)
Space & Security Robotics

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