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failed to roslaunch remotely on another computer

asked 2016-11-11 01:37:49 -0600

johnyang gravatar image

updated 2016-11-13 19:35:12 -0600

I am trying to remotely launch realsense from another computer. Pinging the remote PC has no problem. I can also execute the launch file from remote computer with roscore on my current PC successfully. I tried to set up a launch file like following:

    <machine name="croc3up1" address="" user="croc3up1" password="croc3up1" env-loader="~/catkin_ws/src/croc3_robot/config/" default="true"/>
    <!-- just testing a simple node-->
    <node machine="croc3up1" pkg="tf" type="static_transform_publisher" name="virtual_joint_broadcaster_0" args="0 0 0 0 0 0 link0 world 100" />

I also tried this:

<include file="$(find realsense_test)/launch/realsense_test.launch" machine="croc3up1"/>

However I am getting the following error message:

... logging to /home/johnyang/.ros/log/25f83d3e-a7db-11e6-bef6-086266c7c72e/roslaunch-johnyang-ubuntu1404-7206.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server :33411/
remote[] starting roslaunch
remote[]: creating ssh connection to, user[croc3up1]
launching remote roslaunch child with command: [env ROS_MASTER_URI=http://localhost:11311 ~/catkin_ws/src/croc3_robot/config/ roslaunch -c -u :33411/ --run_id 25f83d3e-a7db-11e6-bef6-086266c7c72e]
remote[]: ssh connection created
remote[]: [:33411/] is not a launch file name
The traceback for the exception was written to the log file

[] killing on exit
remote roslaunch failed to launch: croc3up1
The traceback for the exception was written to the log file looks like following:

export ROS_HOSTNAME=""
export ROS_IP=""
. ~/catkin_ws/devel/
exec "$@"

It sounded like the file is executed properly and ssh connection is established correctly. However it seemed having difficulty finding the the correct launch file to execute (throwing "is not a launch file name" error). The launch file is definitely put on the 2nd PC.

If I just manually ssh into the 2nd PC and I can perform all the roslaunch straight away (since I setup source ~/catkin/devel/setup.bash in ~/.bashrc etc already).

Any clue why using the "machine" tag to remotely start launch files does not work here? (I'm using ROS Jade) Thanks.

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I found something suspicious in the terminal output. There is a space between "" and ":33411"... which is probably the major reason of the error. Maybe there is a bug in the source code for ROS Jade

johnyang gravatar image johnyang  ( 2016-11-13 21:10:35 -0600 )edit

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answered 2016-11-13 22:02:22 -0600

johnyang gravatar image

I figured out eventually after going through the log and source code of roslaunch. It's actually because I had "export ROS_HOSTNAME=hostname -I" instead of "export ROS_HOSTNAME=". This will then not create that extra space behind the server uri.

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If you are going to use IPs, please consider setting ROS_IP instead of ROS_HOSTNAME. See wiki/EnvironmentVariables - Node Environment Variables - ROS_IP/ROS_HOSTNAME for some info on those variables.

gvdhoorn gravatar image gvdhoorn  ( 2016-11-14 04:23:50 -0600 )edit

That's a good point. Thanks.

johnyang gravatar image johnyang  ( 2016-11-15 17:51:36 -0600 )edit

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Asked: 2016-11-11 01:37:49 -0600

Seen: 1,254 times

Last updated: Nov 13 '16