Subscribing to a field within the pose topic

[sdorman]

I am exclusively trying to echo the x,y,z positions of the whycon poses in ROS, but I don't understand the formatting for executing this. With a standard geometry_msgs/PoseArray, you would simply type:
rostopic echo /whycon/poses/position.x to get only the x positions. However, this does not work with whycon.

Do you know what the proper formatting to echo x,y,z positions without orientations?

[protobits]

I'm not sure if that is possible with any syntax on the command line. You would have to write your own node to retrieve the information you need.
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