rosrun beginner_tutorials listener.py results in no output

asked 2017-12-07 06:56:24 -0600

shivak singh
13 ●2 ●2 ●8

HI All

I'm using ubuntu 16/04 along with python for writing nodes.

I just have few hours experience on ROS.

I pushed rosrun beginner_tutorials listener.py after defining the source but this resulted in no output ust the cursor blinking for few times then stagnant.

I rechecked the CMakeLists.txt but couldn't find any any dependencies in it with reference to tutorials (I'm not sure though)

Sincerely

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answered 2017-12-07 10:43:24 -0600

jayess
6155 ●26 ●85 ●92

updated 2017-12-07 19:55:31 -0600

I'm assuming that you're doing the subscriber/publisher tutorial for rospy. Are you running the talker node? The listener node will only do something if there's a node publishing (i.e.,callback functions are only called when they receive data on a topic). Try running both nodes and see what happens.

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To add-on, run another terminal (e.g: control +shift + o) and rosrun beginner_tutorials talker.py

okkewei ( 2020-10-14 15:12:47 -0600 )edit

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answered 2017-12-07 11:42:19 -0600

Gayan Brahmanage

929 ●6 ●15 ●17

You need to publish the topic what you have configured for subscribing. If the topic is not being published, your subscriber callback function is not called.

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rosrun beginner_tutorials listener.py results in no output

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