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For this part,

I executed roswtf again, after roslaunch turtle_tf turtle_tf_demo.launch, and now I don't have the errors above anymore, but just a warning:

WARNING The following node subscriptions are unconnected:
 * /turtle_pointer:
   * /tf_static

What's happening? Why did roswtf think that certain nodes (e.g. /teleop) were supposed to be connected (to what? to the master?), even though some of them were not connected but some were?

this isn't an issue. See #q115591. For the case of turtle_tf specifically, TransformListener is used in this line in the code used to run turtle_pointer node.

For this part,

I executed roswtf again, after roslaunch turtle_tf turtle_tf_demo.launch, and now I don't have the errors above anymore, but just a warning:

WARNING The following node subscriptions are unconnected:
 * /turtle_pointer:
   * /tf_static

What's happening? Why did roswtf think that certain nodes (e.g. /teleop) were supposed to be connected (to what? to the master?), even though some of them were not connected but some were?

this isn't an issue. issue, besides it's just a warning. See #q115591. For the case of turtle_tf specifically, TransformListener is used in this line in the code used to run turtle_pointer node.

For this part,

I executed roswtf again, after roslaunch turtle_tf turtle_tf_demo.launch, and now I don't have the errors above anymore, but just a warning:

WARNING The following node subscriptions are unconnected:
 * /turtle_pointer:
   * /tf_static

What's happening? Why did roswtf think that certain nodes (e.g. /teleop) were supposed to be connected (to what? to the master?), even though some of them were not connected but some were?

this isn't an issue, besides it's just a warning. See #q115591. For the case of turtle_tf specifically, TransformListener is used in this line in the code used to run turtle_pointer node.


Update: I found this warning confusing, so filed a ticket.