Timed out waiting for transform from tb3_2/base_footprint to map to become available before running costmap, tf error: Could not find a connection between 'map' and 'tb3_2/base_footprint' because they are not part of the same tree.Tf has two or more unconnected trees..

[gege980823]

I ran into this problem when I was running multiple robots and I didn't know what to do about it. Is it useful to publish a tf static transform from odom to base_footprint? My tf tree is disconnected from odom to base_footprint.Meanwhile, there is no news on my scan topic.I just learned multi-robot slam, and there are many things I don't understand. I hope someone can give me some advice!

[sandilyasg]

@gege980823 were you able to solve it? Can you please post how you solved the issue? Thanks

[hikashi]

I believe it has something to do with the turtlebot environment setup you have and therefore this issue occurred.
Can you download the turtlebot3 library and retry again?

[Daviesss]

I ran into this problem when I was running multiple robots and I didn't know what to do about it. Is it useful to publish a tf static transform from odom to base_footprint? My tf tree is disconnected from odom to base_footprint.Meanwhile, there is no news on my scan topic.I just learned multi-robot slam, and there are many things I don't understand. I hope someone can give me some advice!

This is as a result of tf tree not correct . There is no connected transform(tf) from map to tb_2/base_footprint , the tree has to be connected before the error is solved .