Questions tagged [latch]
The latch tag has no usage guidance.
10 questions
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Message order with multiple publishers to same latched topic
Scenario:
a node A publishes "hello" to a latched topic /x with queue size 1
then a node B publishes "world" to the same latched topic /x with queue size 1
Because of the latched ...
knxa
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How should a subscriber interpret multiple messages upon subscription?
If I have multiple nodes who each latch a message onto a particular topic, a node that later subscribes to that topic will receive multiple messages immediately upon subscription. If those message ...
BJP
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How to display the function of latch?
I want to show the function of latch in publisher. According to the description of the latch: "When a connection is latched, the last message published is saved and automatically sent to any ...
fengxi
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About Subscriber Structure and “latch” on Publisher
Hi everyone. Recently I met a question when I read something about "latch" in Publisher. On the Publisher wiki page, "latch" is described as:(http://wiki.ros.org/rospy/Overview/...
pcler
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Can I get a latched topic with rosh?
I've noticed that if I start up a node, create a latched publisher, and then publish a single message (let's say on the topic foo), if I then go into rosh and do topics.foo[0], it will just sit there ...
Dan Lazewatsky
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Is Latching handled by the Master or Node?
Is Latching handled by the Master or Node?
Thanks,
Aaron
Originally posted by unknown_entity1 on ROS Answers with karma: 104 on 2014-03-07
Post score: 0
unknown_entity1
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19
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latch=True in rospy.Publisher() appears to have no effect
I have a joint which I want to move to a position when the robot is initialized. The joint is never moved again. Therefore, I do this:
...
Jim Rothrock
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11
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roscpp and latched topics
Hi there,
I have the following problem.
One of my node just parses a file and stream reference trajectories as Path/Markers topics. These trajectories are almost never updated. Therefore I would like ...
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latched topic and rviz
Hello,
I have some constant data published as MarkerArray topics so it can be seen in rviz.
Instead of streaming constant data, I thought it would be much more optimal to use latched topics to publish ...
0
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Publish a latched message in rosjava
Hi,
I am trying to publish a latched message in rosjava so that my arduino only receives a command when it is different than the preivous one. Currently, it is constantly polling and that makes my ...
Tuan