[topic_tools] relay_field which allows relay topic fields to another fields

[wkentaro]

No description provided.

[wkentaro]

The output is like this::

Basic usage is::

$ rosrun rospy_tutorials talker.py

$ rosrun topic_tools relay_field /chatter /image sensor_msgs/Image "header:
  seq: 0
  stamp: {secs: 0, nsecs: 0}
  frame_id: m.data
height: 0
width: 0
encoding: ''
is_bigendian: 0
step: 0
data: ''"

$ rostopic echo /image
header:
  seq: 0
  stamp: {secs: 0, nsecs: 0}
  frame_id: hello world 1436995720.88
height: 0
width: 0
encoding: ''
is_bigendian: 0
step: 0
data: ''
...

[wkentaro]

relates to #638

[wjwwood]

Ok, thanks we'll get to this as soon as we can!

[dirk-thomas]

Thanks for creating this new script. Currently it is not yet being installed and therefore would not be part of the Debian package. Please add it to the list of installed scripts:

ros_comm/tools/topic_tools/CMakeLists.txt

Lines 66 to 72 in 61d987d

	catkin_install_python(PROGRAMS
	scripts/mux_add
	scripts/mux_delete
	scripts/mux_list
	scripts/mux_select
	scripts/transform
	DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION})

[wkentaro]

Thanks. I added it to the list.

[dirk-thomas]

Thanks. I have squashed the commits and fixed a few minor Python style issues. It has been merged in 2faea45.

[wkentaro]

Thanks.

2015年9月17日木曜日、Dirk Thomasnotifications@github.comさんは書きました:

Thanks. I have squashed the commits and fixed a few minor Python style
issues. It has been merged in 2faea45
2faea45
.

—
Reply to this email directly or view it on GitHub
#639 (comment).

和田 健太郎 / Kentaro Wada
http://wkentaro.com http://www.wkentaro.com

[gavanderhoorn]

Has this ever been documented? The topic_tools wiki page does not list it.

[130s]

Has this ever been documented? The topic_tools wiki page does not list it.

Might not be super helpful but I added this feature to the list with the smallest description and a link to this PR from the wiki.

[abaldur]

Is it possible to use the relay_field with arrays?
Let's say I have a topic /array_of_floats with msg type: float64[] data.
The following does not work for me:
rosrun topic_tools relay_field /array_of_floats /value_of_first_index std_msgs/Float64 "{data: m.data[0]}"
Any ideas?

[cwecht]

rostopic pub /array_of_floats std_msgs/Float64MultiArray "{data: [3.4, 3] }" -r 1.0
rosrun topic_tools relay_field /array_of_floats /value_of_first_index std_msgs/Float64 "data: m.data[0]"

This works. It seems, that the expression you have passed is not a Python expression.

[abaldur]

Got it, thx @cwecht

[marcelino-pensa]

In case anyone is a noob like I am and is wondering how to run the example above through a launch file, this is how you do it:

<launch>
  <node pkg="topic_tools" type="relay_field"
        name="field_relayer"
        args="/chatter /image sensor_msgs/Image 
            '{header:
                {seq: 0,
                stamp: {secs: 0, nsecs: 0},
                frame_id: m.data},
            height: 0,
            width: 0,
            encoding: '',
            is_bigendian: 0,
            step: 0,
            data: ''}' "/>
</launch>

[BereNiM]

Hello, I'm newie in ROS. I have a topic with some fields (see the image) and I want to send the information from proces_value to another node (/states). I've tried something like rosrun topic_tools relay_field /lidar/joint1_position_controller/state/process_value /state std_msgs/Float64 "{data: m.data}" but it doesn't work :( Is it possible to do that with relay_field tool?

Thanks in advance (:

[marcelino-pensa]

It seems like this package is completely broken in Noetic, as not even the simple example of the OP works (issue as described in #2167 )
=/