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Answering the title question, your tf
tree looks okay to me; it is similar to what we use in most of our mobile bases.
Regarding the absence of a map:
rosnode info
for hector? Are you subscribing to the correct map topic in rviz
?Your internet connection should not have much of an influence you ROS as long as:
localhost
or 127.0.0.1
.Best of luck!