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I think I figured it out. I prepended my message with

uint32 seq time stamp string frame_id

and inside my publisher method I have something like

planner::TargetStates msg

after filling in all of the fields and before publishing time stamp the message with

msg.header.stamp = ros::Time::now();

Then rxplot works and generates plots over time. I hope this helps fellow rostards like myself

Cheers

Gideon