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I solved it myself. Should I delete this question?
It turned out to be a mismatched ROS_MASTER_URI. I found it just by trial and error. I wonder if there was a clue in th elog above that would have helped me.
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I solved it myself. Should I delete this question?Let me describe the setup:
It turned out A turtlebot3 robot is running roscore on board + the rest of the basic ROS Stack. The robot has a domain name, say r1.brandeis.edu. On the robot,
A wifi connected laptop has
This set up works. The problem I had which seemed to be causing the failure was caused by not following that setup.
I remain confused about the interaction between ROS_IP and ROS_HOSTNAME. For example, if on the laptop I setup ROS_HOSTNAME=localhost, this does not work. Also if I have both ROS_HOSTNAME and ROS_IP this causes problems. So I believe I am close to having a mismatched ROS_MASTER_URI. I found it just by trial and error. I wonder if robust configuration but there was a clue in th elog above that would have helped are some interactions which are confusing to me.
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